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Learn more about the causes and effects of natural disasters.

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natural hazards and disasters Archives - National Geographic Kids

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A dark greenish tinge covers the sky, and black storm clouds threaten above. The wind roars loudly while cats hide under couches and dogs start howling. A tornado is forming.

Also known as twisters, tornadoes are violently spinning, funnel-shaped columns of air that stretch from the dark thunderclouds they form in all the way to the ground. The wind from a tornado can top 250 miles an hour-that's faster than a race car! These extreme gusts can rip apart buildings, destroy bridges, flip trains, and send cars flying. They can even tear the bark off trees and suck all the water from a riverbed.

Tornadoes occur all over the planet, but the United States leads the world in the strength and number of storms: About a thousand twisters touch down every year. ( Argentina and Bangladesh are next.) As part of larger U.S. storm systems, they cause about 80 deaths a year and close to $1 billion in damage.

How tornadoes develop

Thunderstorms form when cold, dry air is pushed over warm, humid air. When that warm air rises through the colder air, it causes an updraft, or a change in wind direction.

If winds from the thunderstorm vary greatly in speed or direction, the updraft will begin to rotate. As the rotating updraft draws in more warm air from the moving thunderstorm, its rotation speed increases, and a funnel cloud begins to form. As the twister gains strength, the funnel becomes longer. (The funnel becomes more visible as more dirt and debris is caught in its rotation.) It's most dangerous when it touches the ground.

The most violent tornadoes come from supercells-the name scientists give to large thunderstorms with winds already in rotation. About one in a thousand thunderstorms becomes a supercell, and one in five or six supercells creates a tornado.

For all their power, the average tornado lasts only about 10 minutes, though some can rage for over an hour. Twisters usually die when they move over colder ground or when the clouds above it start to break up.

The Tri-State Tornado of 1925 holds the record for time and distance of a tornado. Named for the three states it hit- Missouri, Illinois, and Indiana -the tornado took three and a half hours to tear through 219 miles.

Where and when tornadoes form

Although tornadoes have been spotted in every U.S. state, many form in a region called Tornado Alley. This zone in the Midwest extends from Texas to Ohio and includes Iowa, Kansas, South Dakota, Oklahoma, and Nebraska.

These states are in the path of warm, moist air traveling from the Gulf of Mexico as well as cool air blowing from the Rocky Mountains. When the warm and cool airstreams meet, tornadoes are likely to form.

Though the storms can happen at any time of the year, tornado season in Texas, Oklahoma, and Kansas occurs in May through early June. In North and South Dakota, Nebraska, Iowa, and Minnesota, tornadoes are more likely to form in June or July.

Tracking tornadoes

During thunderstorms, meteorologists use weather satellites, weather balloons, and buoys to gather data like wind speed and temperature. Then they analyze that data with supercomputers. This helps scientists pinpoint where and when a twister might form, as well as how strong or long-lasting it might be.

If weather conditions are right for a tornado to form, experts issue a tornado watch for a region, like a county or large part of a state. This doesn't mean that a tornado is on the way. But it could be-meteorologists issue the watch so people can be prepared.

When a tornado is spotted or picked up on weather radar, scientists issue a tornado warning for a smaller area, like a town or part of a city. People there are urged to take cover.

Some experts actually drive into areas where storms are forming! Vehicles tricked out with special science equipment measure things like temperature, humidity, and air pressure that's submitted to meteorologists at weather service headquarters. But the information that these "tornado chasers" gather also helps scientists better understand the science of tornados.

Thanks to these tools, meteorologists are now able to quickly predict when and where a tornado will form, giving people in a twister's path more time to seek shelter. For instance, in the 1980s, people only had about a five-minute warning before a tornado hit; by the late 2000s, the warning time grew to 13 minutes.

How to survive a tornado
Before a tornado
* Listen to weather reports for tornado warnings.
* Close all the windows.
* Prepare a safe room. This can be your basement or the lowest room in the center of your house or apartment building, away from outer walls and windows. Window-free closets and bathrooms work well, too.
* Fill the safe room with blankets, pillows, sleeping bags, and your family emergency kit (water, food, flashlight, and radio).
* Have an emergency safety plan. If you live in a trailer or mobile home, make sure you know where to go to evacuate.
During a tornado
* Stay inside-never attempt to watch or chase a tornado.
* Do not go near windows. It's not the tornado itself that causes most injuries; it's the flying debris-or the windows they crash through-that cause most injuries.
* Cover yourself with the pillows, blankets, and sleeping bags. If there's a sturdy piece of furniture, like a table, crawl under it.
* Cover your head and neck with your arms.
* If you're caught outside and can't find shelter, look for a ditch, gulley, or just a flat piece of ground away from trees and cars. Lie down as flat as you can and cover your head and neck with your arms. (Do not try this under a bridge or overpass.)
After a tornado
* Do not leave your shelter until local authorities give the OK. Follow their instructions.
* If you go outside, watch where you step-dangerous debris can be anywhere.
* Continue to monitor tornado reports. Sometimes more than one can whip up in the same place.
Learn more about tornadoes at National Geographic.
Tornado safety tips from the Nat Geo Kids book Extreme Weather by Thomas Kostigen and How to Survive Anything by Rachel Buchholz

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Find out what causes these deadly twisters-and how to stay safe.

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Tornadoes are one of the most violent and powerful types of weather. They consist of a very fast rotating column of air that usually forms a funnel shape. They can be very dangerous as their high speed winds can break apart buildings, knock down trees, and even toss cars into the air.

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Kids learn about tornadoes including how they form, characteristics, types including supercell and waterspout, categories, and fun facts.

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A tornado is a type of storm in which powerful rotating winds form a column, which reaches from a cloud down toward the ground. The winds of a tornado are the strongest on...

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A tornado is a tube of violently spinning air that touches the ground. Wind inside the tornado spins fast, but the actual 'circle' of wind around them is huge. This makes tornadoes very dangerous. Tornadoes are especially dangerous to people in cars or mobile homes. About 60 people are killed by tornadoes every year.

The word tornado comes from the Spanish word tornado (past participle of 'to turn', or 'to have turned', which comes from the Latin tonare 'to thunder'.

Tornadoes destroy things. They can tear houses to pieces and often leave people homeless. They are smaller than hurricanes but stronger. Nearly three quarters of the world's tornadoes happen in the United States. However, they can happen anywhere.

They cause a lot of damage to anything in their path. Tornadoes are ranked on the Enhanced Fujita scale, from E F0 to E F5. E F0 for tornados that caused the least damage, and E F5 for the ones that caused the most.

Tornadoes can happen in nearly any part of the world. In the United States, a tornado has happened in all states. The middle part of the United States is nicknamed ' Tornado Alley' for the number of tornadoes there. A tornado can have wind speeds of over 300 miles per hour (480 km/h).

Most tornadoes have wind speeds less than 110 miles per hour (180 km/h), are about 250 feet (80 m) across and travel a few miles before disappearing. Other tornado-like phenomena that exist in nature include the gustnado, dust devil, fire whirls, and steam devil; downbursts are frequently confused with tornadoes, though their action is not similar.

A "tornado watch" is given when the weather conditions look like a tornado could form. A 'PDS (Particularly Dangerous Situation)' watch is given when a likely tornado outbreak is to start, many strong tornadoes will form in the area, or an ongoing tornado outbreak is in the works in the area. A " tornado warning" is given if somebody has actually seen a tornado or if a tornado 'signature' (usually the storm has a 'hook' or 'U' echo) has shown up on radar. Tornado emergencies are issued in Special Weather Statements or Tornado Warnings saying that a powerful tornado is about to hit an area with a lot of people in it (especially cities in Tornado Alley), a tornado has been spotted, and the tornado is expected to cause deaths.

Characteristics

Size and shape

Most tornadoes take on the appearance of a narrow funnel, a few hundred meters (yards) across, with a small cloud of debris near the ground. Tornadoes may be obscured completely by rain or dust. These tornadoes are especially dangerous, as even experienced meteorologists might not see them.

Small, relatively weak landspouts may be visible only as a small swirl of dust on the ground. Although the condensation funnel may not extend all the way to the ground, if associated surface winds are greater than 64 km/h (40 mph), the circulation is considered a tornado. A tornado with a nearly cylindrical profile and relatively low height is sometimes referred to as a "stovepipe" tornado. Large tornadoes which appear at least as wide as their cloud-to-ground height can look like large wedges stuck into the ground, and so are known as "wedge tornadoes" or "wedges". A wedge can be so wide that it appears to be a block of dark clouds, wider than the distance from the cloud base to the ground. Even experienced storm observers may not be able to tell the difference between a low-hanging cloud and a wedge tornado from a distance. Many, but not all major tornadoes are wedges.

Tornadoes in the dissipating stage can resemble narrow tubes or ropes, and often curl or twist into complex shapes. These tornadoes are said to be "roping out", or becoming a "rope tornado". When they rope out, the length of their funnel increases, which forces the winds within the funnel to weaken. Multiple-vortex tornadoes can appear as a family of swirls circling a common center, or they may be completely obscured by condensation, dust, and debris, appearing to be a single funnel.

In the United States, tornadoes are around 500 feet (150 m) across on average. However, there is a wide range of tornado sizes. Weak tornadoes, or strong yet dissipating tornadoes, can be exceedingly narrow, sometimes only a few feet or couple meters across. One tornado was reported to have a damage path only 7 feet (2.1 m) long. On the other end of the spectrum, wedge tornadoes can have a damage path a mile (1.6 km) wide or more. A tornado that affected Hallam, Nebraska on May 22, 2004, was up to 2.5 miles (4.0 km) wide at the ground, and a tornado in El Reno, Oklahoma on May 31, 2013, was approximately 2.6 miles (4.2 km) wide, the widest on record.

Track length

In the United States, the average tornado travels on the ground for 5 miles (8.0 km). However, tornadoes are capable of both much shorter and much longer damage paths: one tornado was reported to have a damage path only 7 feet (2.1 m) long, while the record-holding tornado for path length-the Tri-State Tornado, which affected parts of Missouri, Illinois, and Indiana on March 18, 1925-was on the ground continuously for 219 miles (352 km). Many tornadoes which appear to have path lengths of 100 miles (160 km) or longer are composed of a family of tornadoes which have formed in quick succession.

Appearance

Tornadoes can have a wide range of colors, depending on the environment in which they form. Those that form in dry environments can be nearly invisible, marked only by swirling debris at the base of the funnel. Condensation funnels that pick up little or no debris can be gray to white. While traveling over a body of water (as a waterspout), tornadoes can turn white or even blue. Slow-moving funnels, which ingest a considerable amount of debris and dirt, are usually darker, taking on the color of debris. Tornadoes in the Great Plains can turn red because of the reddish tint of the soil, and tornadoes in mountainous areas can travel over snow-covered ground, turning white.

Lighting conditions are a major factor in the appearance of a tornado. A tornado which is "back-lit" (viewed with the sun behind it) appears very dark. The same tornado, viewed with the sun at the observer's back, may appear gray or brilliant white. Tornadoes which occur near the time of sunset can be many different colors, appearing in hues of yellow, orange, and pink.

Dust kicked up by the winds of the parent thunderstorm, heavy rain and hail, and the darkness of night are all factors that can reduce the visibility of tornadoes. Tornadoes occurring in these conditions are especially dangerous, since only weather radar observations, or possibly the sound of an approaching tornado, serve as any warning to those in the storm's path. Most significant tornadoes form under the storm's updraft base, which is rain-free, making them visible. Also, most tornadoes occur in the late afternoon, when the bright sun can penetrate even the thickest clouds.

There is mounting evidence, including Doppler on Wheels mobile radar images and eyewitness accounts, that most tornadoes have a clear, calm center with extremely low pressure, akin to the eye of tropical cyclones. Lightning is said to be the source of illumination for those who claim to have seen the interior of a tornado.

Tornadoes normally rotate cyclonically (when viewed from above, this is counterclockwise in the northern hemisphere and clockwise in the southern).

Sound and seismology

Various sounds of tornadoes have been reported. They include a freight train, rushing rapids or waterfall, a nearby jet engine, or combinations of these. Many tornadoes are not audible from much distance; the nature of and the propagation distance of the audible sound depends on atmospheric conditions and topography.

Since many tornadoes are audible only when very near, sound is not to be thought of as a reliable warning signal for a tornado.

How they form

Tornadoes often develop from a class of thunderstorms known as supercells. Supercells contain mesocyclones, an area of organized rotation a few kilometers/miles up in the atmosphere, usually 1.6-9.7 km (1-6 miles) across. Most intense tornadoes (EF3 to EF5 on the Enhanced Fujita Scale) develop from supercells. In addition to tornadoes, very heavy rain, frequent lightning, strong wind gusts, and hail are common in such storms.

Most tornadoes from supercells follow a recognizable life cycle which begins when increasing rainfall drags with it an area of quickly descending air known as the rear flank downdraft (RFD). This downdraft accelerates as it approaches the ground, and drags the supercell's rotating mesocyclone towards the ground with it.

As the mesocyclone lowers below the cloud base, it begins to take in cool, moist air from the downdraft region of the storm. The convergence of warm air in the updraft and cool air causes a rotating wall cloud to form. The RFD also focuses the mesocyclone's base, causing it to draw air from a smaller and smaller area on the ground. As the updraft intensifies, it creates an area of low pressure at the surface. This pulls the focused mesocyclone down, in the form of a visible condensation funnel. As the funnel descends, the RFD also reaches the ground, fanning outward and creating a gust front that can cause severe damage a considerable distance from the tornado. Usually, the funnel cloud begins causing damage on the ground (becoming a tornado) within a few minutes of the RFD reaching the ground.

Initially, the tornado has a good source of warm, moist air flowing inward to power it, and it grows until it reaches the "mature stage". This can last from a few minutes to more than an hour, and during that time a tornado often causes the most damage, and in rare cases can be more than 1.6 km (1 mile) across. The low pressured atmosphere at the base of the tornado is essential to the endurance of the system. Meanwhile, the RFD, now an area of cool surface winds, begins to wrap around the tornado, cutting off the inflow of warm air which previously fed the tornado. The flow inside the funnel of the tornado is downward, supplying water vapor from the cloud above. This is contrary to the upward flow inside hurricanes, supplying water vapor from the warm ocean below.

Dissipation

As the RFD completely wraps around and chokes off the tornado's air supply, the vortex begins to weaken, becoming thin and rope-like. This is the "dissipating stage", often lasting no more than a few minutes, after which the tornado ends. During this stage, the shape of the tornado becomes highly influenced by the winds of the parent storm, and can be blown into fantastic patterns. Even though the tornado is dissipating, it is still capable of causing damage. The storm is contracting into a rope-like tube and, due to conservation of angular momentum, winds can increase at this point.

Although this is a widely accepted theory for how most tornadoes form, live, and die, it does not explain the formation of smaller tornadoes, such as landspouts, long-lived tornadoes, or tornadoes with multiple vortices. These each have different mechanisms which influence their development-however, most tornadoes follow a pattern similar to this one.

Multiple vortex

A multiple-vortex tornado is a type of tornado in which two or more columns of spinning air rotate about their own axes and at the same time revolve around a common center. A multi-vortex structure can occur in almost any circulation, but is very often observed in intense tornadoes. These vortices often create small areas of heavier damage along the main tornado path. This is a phenomenon that is distinct from a satellite tornado, which is a smaller tornado that forms very near a large, strong tornado contained within the same mesocyclone. The satellite tornado may appear to " orbit" the larger tornado (hence the name), giving the appearance of one, large multi-vortex tornado. However, a satellite tornado is a distinct circulation, and is much smaller than the main funnel.

Waterspout

A waterspout is defined by the National Weather Service as a tornado over water. However, researchers typically distinguish "fair weather" waterspouts from tornadic (i.e. associated with a mesocyclone) waterspouts. Fair weather waterspouts are less severe but far more common, and are similar to dust devils and landspouts. They form at the bases of cumulus congestus clouds over tropical and subtropical waters. They have relatively weak winds, smooth laminar walls, and typically travel very slowly. They occur most commonly in the Florida Keys and in the northern Adriatic Sea. In contrast, tornadic waterspouts are stronger tornadoes over water. They form over water similarly to mesocyclonic tornadoes, or are stronger tornadoes which cross over water. Since they form from severe thunderstorms and can be far more intense, faster, and longer-lived than fair weather waterspouts, they are more dangerous. In official tornado statistics, waterspouts are generally not counted unless they affect land, though some European weather agencies count waterspouts and tornadoes together.

A landspout, or dust-tube tornado, is a tornado not associated with a mesocyclone. The name stems from their characterization as a "fair weather waterspout on land". Waterspouts and landspouts share many defining characteristics, including relative weakness, short lifespan, and a small, smooth condensation funnel that often does not reach the surface. Landspouts also create a distinctively laminar cloud of dust when they make contact with the ground, due to their differing mechanics from true mesoform tornadoes. Though usually weaker than classic tornadoes, they can produce strong winds which could cause serious damage.

Intensity and damage

The Fujita scale and the Enhanced Fujita Scale rate tornadoes by damage caused. The Enhanced Fujita (EF) Scale was an update to the older Fujita scale. The EF Scale was designed so that a tornado rated on the Fujita scale would receive the same numerical rating, and was implemented starting in the United States in 2007. An EF0 tornado will probably damage trees but not substantial structures, whereas an EF5 tornado can rip buildings off their foundations leaving them bare and even deform large skyscrapers. The similar TORRO scale ranges from a T0 for extremely weak tornadoes to T11 for the most powerful known tornadoes. Doppler weather radar data, photogrammetry, and ground swirl patterns (cycloidal marks) may also be analyzed to determine intensity and award a rating.

Tornadoes vary in intensity regardless of shape, size, and location, though strong tornadoes are typically larger than weak tornadoes. The association with track length and duration also varies, although longer track tornadoes tend to be stronger. In the case of violent tornadoes, only a small portion of the path is of violent intensity, most of the higher intensity from subvortices.

In the United States, 80% of tornadoes are EF0 and EF1 (T0 through T3) tornadoes.

Outside Tornado Alley, and North America in general, violent tornadoes are extremely rare. This is apparently mostly due to the lesser number of tornadoes overall, as research shows that tornado intensity distributions are fairly similar worldwide. A few significant tornadoes occur annually in Europe, Asia, southern Africa, and southeastern South America.

Main page: Convective storm detection

Rigorous attempts to warn of tornadoes began in the United States in the mid-20th century. Before the 1950s, the only method of detecting a tornado was by someone seeing it on the ground. Often, news of a tornado would reach a local weather office after the storm. However, with the advent of weather radar, areas near a local office could get advance warning of severe weather. The first public tornado warnings were issued in 1950 and the first tornado watches and convective outlooks came about in 1952. In 1953, it was confirmed that hook echoes were associated with tornadoes. By recognizing these radar signatures, meteorologists could detect thunderstorms probably producing tornadoes from several miles away.

Today most developed countries have a network of weather radars, which serves as the primary method of detecting hook signatures that are likely associated with tornadoes. In the United States and a few other countries, Doppler weather radar stations are used. These devices measure the velocity and radial direction (towards or away from the radar) of the winds within a storm, and so can spot evidence of rotation in storms from over 160 km (100 miles) away. When storms are distant from a radar, only areas high within the storm are observed and the important areas below are not sampled. Data resolution also decreases with distance from the radar. Some meteorological situations leading to tornadogenesis are not readily detectable by radar and tornado development may occasionally take place more quickly than radar can complete a scan and send the batch of data. Doppler radar systems can detect mesocyclones within a supercell thunderstorm. This allows meteorologists to predict tornado formations throughout thunderstorms.

Storm spotting

Spotters usually are trained by the NWS on behalf of their respective organizations, and report to them. The organizations activate public warning systems such as sirens and the Emergency Alert System (EAS), and they forward the report to the NWS. There are more than 230,000 trained Skywarn weather spotters across the United States.

In Canada, a similar network of volunteer weather watchers, called Canwarn, helps spot severe weather, with more than 1,000 volunteers. In Europe, several nations are organizing spotter networks under the auspices of Skywarn Europe and the Tornado and Storm Research Organisation (TORRO) has maintained a network of spotters in the United Kingdom since 1974.

Storm spotters are required because radar systems such as NEXRAD detect signatures that suggest the presence of tornadoes, rather than tornadoes as such. Radar may give a warning before there is any visual evidence of a tornado or an imminent one, but ground truth from an observer can give definitive information. The spotter's ability to see what radar cannot is especially important as distance from the radar site increases, because the radar beam becomes progressively higher in altitude further away from the radar, chiefly due to curvature of Earth, and the beam also spreads out.

Visual evidence

Storm spotters are trained to discern whether or not a storm seen from a distance is a supercell. They typically look to its rear, the main region of updraft and inflow. Under that updraft is a rain-free base, and the next step of tornadogenesis is the formation of a rotating wall cloud. The vast majority of intense tornadoes occur with a wall cloud on the backside of a supercell.

Evidence of a supercell is based on the storm's shape and structure, and cloud tower features such as a hard and vigorous updraft tower, a persistent, large overshooting top, a hard anvil (especially when backsheared against strong upper level winds), and a corkscrew look or striations. Under the storm and closer to where most tornadoes are found, evidence of a supercell and the likelihood of a tornado includes inflow bands (particularly when curved) such as a "beaver tail", and other clues such as strength of inflow, warmth and moistness of inflow air, how outflow- or inflow-dominant a storm appears, and how far is the front flank precipitation core from the wall cloud. Tornadogenesis is most likely at the interface of the updraft and rear flank downdraft, and requires a balance between the outflow and inflow.

Only wall clouds that rotate spawn tornadoes, and they usually precede the tornado between five and thirty minutes. Rotating wall clouds may be a visual manifestation of a low-level mesocyclone. Barring a low-level boundary, tornadogenesis is highly unlikely unless a rear flank downdraft occurs, which is usually visibly evidenced by evaporation of cloud adjacent to a corner of a wall cloud. A tornado often occurs as this happens or shortly afterwards; first, a funnel cloud dips and in nearly all cases by the time it reaches halfway down, a surface swirl has already developed, signifying a tornado is on the ground before condensation connects the surface circulation to the storm. Tornadoes may also develop without wall clouds, under flanking lines and on the leading edge. Spotters watch all areas of a storm, and the cloud base and surface.

Myths and misconceptions

It is often thought that opening windows will lessen the damage caused by a tornado. While there is a big drop in atmospheric pressure inside a strong tornado, it is unlikely that the pressure drop would be enough to cause the house to explode. Opening windows may actually increase the tornado's damage. A violent tornado can destroy a house whether its windows are open or closed. Another common misconception is that highway overpasses provide adequate shelter from tornadoes. Due to the Venturi effect, tornadic winds are stronger in the small space of an overpass. In the 1999 Oklahoma tornado outbreak of May 3, 1999, three highway overpasses were directly hit by tornadoes. At each of the three places there was a death, along with many life-threatening injuries. By comparison, during the same tornado outbreak, more than 2000 homes were completely destroyed, with another 7000 damaged, and yet only a few dozen people died in their homes.

There are areas which people believe to be safe from tornadoes, whether by being in a city, near a major river, hill, or mountain, or even protected by supernatural forces. Tornadoes have been known to cross major rivers, climb mountains, hit valleys, and have damaged several city centers. As a general rule, no area is safe from tornadoes, though some areas are more likely to be hit than others.

Safety tips

To keep safe in a tornado, here are some tips you can follow:

Go to the lowest floor of the building. Stay close to the center of the building and away from windows, for example, a bathroom with no windows and get into the bathtub.

Find a piece of strong furniture or a mattress to go under or hide in a closet and wait until it is over.

If you are in a school, do not go to the gymnasium or any other place that has a high ceiling. Squat near the wall, placing your hands on the back of your head.

If you cannot find shelter, find the lowest, most protected ground and cover your head with your hands.

Do not drive in tornadoes. If you are in your car, position your head above the steering wheel, and cover yourself up.

Do not seek shelter underneath an underpass or a bridge, as winds can send debris in your path.

Related pages

In Spanish: Tornado para niños

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Find amazing facts about animals, science, history and geography, along with fun competitions, games and more. Visit National Geographic Kids today!

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Learn what causes these deadly storms-and how to stay safe.

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How Do Hurricanes Form? | NASA Space Place – NASA Science for Kids

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Nor'easters can occur in the eastern United States any time between October and April, when moisture and cold air are plentiful. A Nor'easter is named for the winds that blow in from the northeast and drive the storm up the east coast along the Gulf Stream, a band of warm water that lies off the Atlantic coast. They are known for dumping heavy amounts of rain and snow, producing hurricane-force winds, and creating high surfs that cause severe beach erosion and coastal flooding. Winter Storms

How do winter storms form?
Winter storms derive their energy from the clash of two air masses of different temperatures and moisture levels. Winter storms usually form when an air mass of cold, dry, Canadian air moves south and interacts with a warm, moist air mass moving north from the Gulf of Mexico. The point where these two air masses meet is called a front. If cold air advances and pushes away the warm air, it forms a cold front. When warm air advances, it rides up over the denser, cold air mass to form a warm front. If neither air mass advances, it forms a stationary front.

What are snowflakes?
Snowflakes are made of ice crystals. Each snowflake is six-sided and made of as many as 200 ice crystals. Snowflakes form in clouds where the temperature is below freezing. The ice crystals form around tiny bits of dirt that has been carried up into the atmosphere by the wind. As the snow crystals grow, they become heavier and fall toward the ground. Why is snow white?
Bright snow blinds us with its gleaming white color because it reflects beams of white light. Instead of absorbing light, snow's complex structure prevents the light from shining through its lattice formation. A beam of white sunlight entering a snow bank is so quickly scattered by a zillion ice crystals and air pockets that most of the light comes bouncing right back out of the snow bank. What little sunlight is absorbed by snow is absorbed equally over the wavelengths of visible light thus giving snow its white appearance. So while many natural objects get their blue, red, and yellow colors from absorbing light, snow is stuck with its white color because it reflects light.

What is thundersnow? How is snow formed?
Snow is commonly formed when water vapor undergoes deposition, which is when water vapor changes directly to ice without first becoming a liquid, high in the atmosphere at a temperature of less than 32°F and then falls to the ground. What is sleet?
Sleet is just rain drops that freeze into ice pellets before reaching the ground. Sleet usually bounces when hitting a surface and does not stick to objects. However, it can accumulate like snow and cause a hazard to motorists.
What is an ice storm?
An ice storm is a type of winter storm caused by freezing rain. The U.S. National Weather Service defines an ice storm as a storm which results in the accumulation of at least 0.25-inch of ice on exposed surfaces.
What is freezing rain?
Freezing rain is just rain that falls onto a surface with a temperature below freezing. This causes it to freeze to surfaces, such as trees, cars, and roads, forming a coating or glaze of ice. Even small accumulations of ice can cause a significant hazard. How do ice storms form?
Ice storms form when a layer of warm air is between two layers of cold air. Frozen precipitation melts while falling into the warm air layer, and then proceeds to refreeze in the cold layer above the ground. This creates freezing rain or a glaze of ice.

What is frost? What is a frost quake?
Frost is white ice crystals that form on a surface, like the ground or leaves of a plant. Frost is created when the air temperature drops below freezing and the water vapor in the air freezes into ice crystals.

How is lake-effect snow formed?
As the cold air flows over the warm lake water, the relatively warm water heats the air's bottom layer as lake moisture evaporates into the cold air. Since warm air is lighter or less dense than cold air, the heated air rises and begins to cool. As the air cools, the moisture that evaporated into it condenses and forms clouds and snow begins falling from the cloud if the air is humid enough. (Graphic Credit: USA TODAY.) What is a Nor'easter?

What is Wind Chill? What is an Alberta Clipper? Click Here to calculate the Wind Chill.
An Alberta clipper is an area of low pressure that generally forms over Alberta, Canada, east of the Rocky Mountains. They develop east of the Rockies because air flowing eastward over the mountains creates favorable conditions. Once an Alberta Clipper forms it usually moves very rapidly to the southeast across the USA's northern Plains and then to the east off the mid-Atlantic Coast. Clippers usually cause only light precipitation with very few producing major snowstorms. However, if conditions are favorable, some Alberta clippers can rapidly intensify off the East Coast once the storm taps the relatively warm moist air over the Atlantic Ocean. The storms that rapidly intensify sometimes spread heavy snow over New England and southeastern Canada. Generally, the main weather features associated with Alberta clippers are some light snow and a reinforcement of cold air over the USA.
What is frostbite? How do blizzards form?

A blizzard is a long-lasting snowstorm with very strong winds and intense snowfall. You need three things to have a blizzard; cold air at the surface, lots of moisture, and lift. Warm air must rise over cold air.
What is an avalanche?
An avalanche is a moving mass of snow that may contain ice, soil, rocks, and uprooted trees. The height of a mountain, the steepness of its slope, and the type of snow lying on it all help determine the likelihood of an avalanche. Avalanches begin when an unstable mass of snow breaks away from a mountainside and moves downhill. The growing river of snow picks up speed as it rushes down the mountain. Avalanches have been known to reach speeds of 245 miles an hour (394 kilometers per hour)—about four times as fast as the speediest downhill skier.
Click Here to learn more about Avalanche Saftey.
Know the Lingo
WINTER WEATHER ADVISORIES - Issued for accumulations of snow, freezing rain, freezing drizzle, and sleet which will cause significant inconveniences and, if caution is not exercised, could lead to life-threatening situations.

Thundersnow is when thunder and lighting occur during a snowstorm. This occurs most often in late winter or early spring. To get thundersnow, you need a mass of cold air on top of warm air, plus moist air closer to the ground. Thundersnow starts out like a summer thunderstorm. The sun heats the ground and pushes masses of warm, moist air upward, creating unstable air columns. As it rises, the moisture condenses to form clouds, which are jostled by internal turbulence. The "tricky part" for making thundersnow is creating that atmospheric instability in the wintertime. For thundersnow to occur, the air layer closer to the ground has to be warmer than the layers above, but still cold enough to create snow. During thundersnow events, heavy snowfall is to be expected. In some cases, two inches per hour is possible.

Click Here to see if there are any active warnings in your area.

Winter Storm Safety Tips
BEFORE A WINTER STORM: Have a disaster plan and prepare a disaster supplies kit for your home and car. Include a first aid kit, emergency food supply, bottled water, battery-operated radio, flashlight, protective clothing, and blankets. Don't forget, be aware of changing weather. DURING A WINTER STORM: Stay indoors and dress warmly. Eat regularly, because food provides the body with energy for producing its own heat. Also, drink lots of water. If you must go outside, wear layered clothing, mittens and a hat. Watch for signs of hypothermia and frostbite. Remember to keep dry. Always change wet clothing to prevent the loss of body heat. If you must drive, carry a cell phone. Always, keep the gas tank full. Don't forget, let someone know where you're going, just in case your car gets stuck. If you're car gets stuck, stay with it and wait for help unless help is visible within 100 yards. Use maps and car mats to stay warm.

AFTER A WINTER STORM: Avoid driving until conditions have improved. Avoid overexertion! Heart attacks from shoveling snow are the leading cause of deaths during the winter. Also, check on neighbors to make sure they're okay.

Frost quakes are non-tectonic seismic events, meaning they are not caused by the shifting of the Earth's tectonic plates. Also known as cryoseisms, frost quakes are caused by a sudden rapid freezing of ground and bedrock, usually when temperatures go from above freezing to below zero. As moisture absorbed in the rock and soil freezes, it expands. This puts a great amount of stress on the areas around it. Eventually, the stress is too much and the soil and rock will crack in an "explosive" manner, creating a loud sound and even shaking the ground surface. Since temperatures are coldest in the overnight hours, most people experience frost quakes in the middle of the night. Winter Storm Activities
Lesson Plan: Here is a great lesson plan on learning about winter weather. In this activity, kids investigate aspects of winter weather, such as temperature and wind. They familiarize themselves with weather-related words. It's a great activity for K-2nd graders.

Cold air moves over warm water and is warmed from below. Moisture evaporates in the air.

Warm moist air rises downwind of lakes and forms heavy snow.

Lesson Plan: Here is a great lesson plan on learning about winter weather. In this activity, kids learn how winter storms form and about the different types of fronts. It's a great activity for 3rd-5th graders. Note: This is a PDF file, so you need to have Adobe Acrobat Reader.
Measuring Snow Experiment: Here is a great experiment that lets kids measure snow. They let the snow melt and then measure it again. It teaches kids that snow is very dense and is why it holds more space than water.

The wind chill is the temperature your body feels when the air temperature is combined with the wind speed. The higher the wind speed the faster exposed areas of your body lose heat and the colder you feel.Melting Snow Experiment: Here is another experiment that teaches kids the difference between the freezing and melting process. It allows kids to take the temperature of a glass of snow. Then, watch the snow melt and observe how the temperature changed.

Frost Experiment: Here is a great experiment that lets kids make frost. They can see how dew turns into frost in a matter of minutes.Examining Snowflakes Experiment: Here is a great experiment that lets kids see snowflakes up close. They can examine the snowflake's six sides.
Pressure Experiment: Here is an experiment that shows how pressure is created in our atmosphere by sucking an egg in a bottle. This is a very cool experiment!
Science Fair Project Ideas: Here is a complete list of science fair project ideas. Discover the science behind the weather that impacts us every day.
Make A Barometer Experiment: Here is an experiment that allows the kids to make a barometer.

Evaporation Experiment: Here is an experiment that shows kids how evaporation takes place.

Frostbite is damage to the skin due to prolonged exposure to cold temperatures, usually below 32° F.

WINTER STORM WATCH - Alerts the public to the possibility of a blizzard, heavy snow, heavy freezing rain, or heavy sleet. Winter Storm Watches are usually issued 12 to 48 hours before the beginning of a winter storm.

WINTER STORM WARNING - Issued when hazardous winter weather in the form of heavy snow, heavy freezing rain, or heavy sleet is occurring. Winter Storm Warnings are usually issued 12 to 24 hours before the event is expected.

BLIZZARD WARNING - Issued for sustained or gusty winds of 35 mph or more, and falling or blowing snow creating visibilities at or below 1/4 mile. These conditions should persist for 3 hours.

FROST/FREEZE WARNING - Issued when below freezing temperatures are expected.

LAKE EFFECT SNOW ADVISORY - Issued when accumulation of lake effect snow will cause significant inconvenience.

LAKE EFFECT SNOW WARNING - Issued when heavy lake effect snow is occurring.

WIND CHILL ADVISORY - Issued when the wind chill temperature is forecast to be between -15°F to -24°F.

WIND CHILL WARNING - Issued when the wind chill temperature is forecast to be -25°F or lower.

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Weather Wiz Kids weather information for kids

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Weather Wiz Kids is a fun and safe website for kids about all the weather info they need to know. It contains tools for weather education, including weather games, activities, experiments, photos, a glossary and educational teaching materials for the classroom.

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How is snow formed?
Snow is commonly formed when water vapor undergoes deposition, which is when water vapor changes directly to ice without first becoming a liquid, high in the atmosphere at a temperature of less than 32°F and then falls to the ground.

What are snowflakes?
Snowflakes are made of ice crystals. Each snowflake is six-sided and made of as many as 200 ice crystals. Snowflakes form in clouds where the temperature is below freezing. The ice crystals form around tiny bits of dirt that has been carried up into the atmosphere by the wind. As the snow crystals grow, they become heavier and fall toward the ground.

Why is snow white?
Bright snow blinds us with its gleaming white color because it reflects beams of white light. Instead of absorbing light, snow's complex structure prevents the light from shining through its lattice formation. A beam of white sunlight entering a snow bank is so quickly scattered by a zillion ice crystals and air pockets that most of the light comes bouncing right back out of the snow bank. What little sunlight is absorbed by snow is absorbed equally over the wavelengths of visible light thus giving snow its white appearance. So while many natural objects get their blue, red, and yellow colors from absorbing light, snow is stuck with its white color because it reflects light.

How do blizzards form?
A blizzard is a long-lasting snowstorm with very strong winds and intense snowfall. You need three things to have a blizzard; cold air at the surface, lots of moisture, and lift. Warm air must rise over cold air.

What are snow squalls?
Snow squalls are brief, intense snow showers accompanied by strong, gusty winds. Accumulation may be significant. Snow squalls are best known in the Great Lakes region.

What is thundersnow?
Thundersnow is when thunder and lighting occur during a snowstorm. This occurs most often in late winter or early spring. To get thundersnow, you need a mass of cold air on top of warm air, plus moist air closer to the ground. Thundersnow starts out like a summer thunderstorm. The sun heats the ground and pushes masses of warm, moist air upward, creating unstable air columns. As it rises, the moisture condenses to form clouds, which are jostled by internal turbulence. The "tricky part" for making thundersnow is creating that atmospheric instability in the wintertime. For thundersnow to occur, the air layer closer to the ground has to be warmer than the layers above, but still cold enough to create snow. During thundersnow events, heavy snowfall is to be expected. In some cases, two inches per hour is possible.

Can it ever be too cold to snow?
It rarely snows when the temperature drops below zero degrees Fahrenheit because the atmosphere is too stable. One of the ingredients for snow is enough lifting of saturated air that snow can develop aloft and fall to reach the surface. When it is said, "it is too cold to snow," in reality it means there is not enough lifting of air to cause snow to reach the surface. Even at very cold surface temperatures, significant snowfall can occur. Intense lifting can produce significant precipitation, even at very low temperatures. The temperature higher in the atmosphere can be much warmer than the air temperature at the surface, and that warm air aloft can hold more moist air than the colder air at the surface. And, moisture can be transferred into the area where lifting is occurring through advection (the horizontal movement of an air mass).

How many inches of snow equals one inch of rain?
On average, thirteen inches of snow equals one inch of rain in the US, although this ratio can vary from two inches for sleet to nearly fifty inches for very dry, powdery snow under certain conditions.

Is it true a person loses most of his body heat through his or her head?
Yes, it's true. It is important to keep the head and neck covered and as warm as possible to delay or prevent hypothermia.

How do winter storms form?
Just like any other storm at other times of the year, the right combination of ingredients is necessary for a winter storm to develop. Three basic ingredients are necessary to make a winter storm: cold air, lift and moisture.

Cold air. Below freezing temperatures in the clouds and near the ground are necessary to make snow and/or ice.

Lift. Something to raise the moist air to form the clouds and cause precipitation. An example of lift is warm air colliding with cold air and being forced to rise over the cold dome. The boundary between the warm and cold air masses is called a front. Another example of lift is air flowing up a mountainside.

Moisture. To form clouds and precipitation. Air blowing across a body of water, such as a large lake or the ocean, is an excellent source of moisture.

How do blizzards form?
A blizzard is a long-lasting snowstorm with very strong winds and intense snowfall. You need three things to have a blizzard; cold air at the surface, lots of moisture, and lift. Warm air must rise over cold air.

What is thundersnow?
Thundersnow is when thunder and lighting occur during a snowstorm. This occurs most often in late winter or early spring. To get thundersnow, you need a mass of cold air on top of warm air, plus moist air closer to the ground. Thundersnow starts out like a summer thunderstorm. The sun heats the ground and pushes masses of warm, moist air upward, creating unstable air columns. As it rises, the moisture condenses to form clouds, which are jostled by internal turbulence. The "tricky part" for making thundersnow is creating that atmospheric instability in the wintertime. For thundersnow to occur, the air layer closer to the ground has to be warmer than the layers above, but still cold enough to create snow. During thundersnow events, heavy snowfall is to be expected. In some cases, two inches per hour is possible.

What is sleet?
Sleet is just rain drops that freeze into ice pellets before reaching the ground. Sleet usually bounces when hitting a surface and does not stick to objects. However, it can accumulate like snow and cause a hazard to motorists.

What is freezing rain?
Freezing rain is just rain that falls onto a surface with a temperature below freezing. This causes it to freeze to surfaces, such as trees, cars, and roads, forming a coating or glaze of ice. Even small accumulations of ice can cause a significant hazard.

What is graupel?
Graupel (a.k.a. soft hail or snow pellets) are soft small pellets of ice created when supercooled water droplets coat a snowflake.

What is an ice storm?
An ice storm is a type of winter storm caused by freezing rain. The U.S. National Weather Service defines an ice storm as a storm which results in the accumulation of at least 0.25-inch of ice on exposed surfaces.

How do ice storms form?
Ice storms form when a layer of warm air is between two layers of cold air. Frozen precipitation melts while falling into the warm air layer, and then proceeds to refreeze in the cold layer above the ground. This creates freezing rain or a glaze of ice.

What is frost?
Frost is white ice crystals that form on a surface, like the ground or leaves of a plant. Frost is created when the air temperature drops below freezing and the water vapor in the air freezes into ice crystals.

What is a frost quake?
Frost quakes are non-tectonic seismic events, meaning they are not caused by the shifting of the Earth's tectonic plates. Also known as cryoseisms, frost quakes are caused by a sudden rapid freezing of ground and bedrock, usually when temperatures go from above freezing to below zero. As moisture absorbed in the rock and soil freezes, it expands. This puts a great amount of stress on the areas around it. Eventually, the stress is too much and the soil and rock will crack in an "explosive" manner, creating a loud sound and even shaking the ground surface. Since temperatures are coldest in the overnight hours, most people experience frost quakes in the middle of the night.

How is lake-effect snow formed?
As the cold air flows over the warm lake water, the relatively warm water heats the air's bottom layer as lake moisture evaporates into the cold air. Since warm air is lighter or less dense than cold air, the heated air rises and begins to cool. As the air cools, the moisture that evaporated into it condenses and forms clouds and snow begins falling from the cloud if the air is humid enough. (Graphic Credit: USA TODAY.)

Cold air moves over warm water and is warmed from below. Moisture evaporates in the air. Warm moist air rises downwind of lakes and forms heavy snow.

What is a Nor'easter?
Nor'easters can occur in the eastern United States any time between October and April, when moisture and cold air are plentiful. A Nor'easter is named for the winds that blow in from the northeast and drive the storm up the east coast along the Gulf Stream, a band of warm water that lies off the Atlantic coast. They are known for dumping heavy amounts of rain and snow, producing hurricane-force winds, and creating high surfs that cause severe beach erosion and coastal flooding.

What is an Alberta Clipper?
An Alberta clipper is an area of low pressure that generally forms over Alberta, Canada, east of the Rocky Mountains. They develop east of the Rockies because air flowing eastward over the mountains creates favorable conditions. Once an Alberta Clipper forms it usually moves very rapidly to the southeast across the USA's northern Plains and then to the east off the mid-Atlantic Coast. Clippers usually cause only light precipitation with very few producing major snowstorms. However, if conditions are favorable, some Alberta clippers can rapidly intensify off the East Coast once the storm taps the relatively warm moist air over the Atlantic Ocean. The storms that rapidly intensify sometimes spread heavy snow over New England and southeastern Canada. Generally, the main weather features associated with Alberta clippers are some light snow and a reinforcement of cold air over the USA.

What is an avalanche?
An avalanche is a moving mass of snow that may contain ice, soil, rocks, and uprooted trees. The height of a mountain, the steepness of its slope, and the type of snow lying on it all help determine the likelihood of an avalanche. Avalanches begin when an unstable mass of snow breaks away from a mountainside and moves downhill. The growing river of snow picks up speed as it rushes down the mountain. Avalanches have been known to reach speeds of 245 miles an hour (394 kilometers per hour)-about four times as fast as the speediest downhill skier.

Why can winter storms be so dangerous?
Most deaths from winter storms are not directly related to the storm itself.

People die in traffic accidents on icy roads.

People die of heart attacks while shoveling snow.

People die of hypothermia from prolonged exposure to cold.

Everyone is potentially at risk during winter storms. The actual threat to you depends on your specific situation. Recent observations show that:

Of injuries related to ice and snow:

About 70% occur in automobiles.

About 25% are people caught out in the storm.

Majority are males over 40 years old.

Of injuries related to exposure to cold:

50% are people over 60 years old.

Over 75% are males.

About 20% occur in the home.

What is Wind Chill?
The wind chill is the temperature your body feels when the air temperature is combined with the wind speed. The higher the wind speed the faster exposed areas of your body lose heat and the colder you feel.

Click here to use a wind chill calculator!

What is frostbite?
Frostbite is damage to the skin due to prolonged exposure to cold temperatures, usually below 32° F.

WINTER STORM OUTLOOK - Issued prior to a Winter Storm Watch. The Outlook is given when forecasters believe winter storm conditions are possible and are usually issued 3 to 5 days in advance of a winter storm.

WINTER WEATHER ADVISORIES - Issued for accumulations of snow, freezing rain, freezing drizzle, and sleet which will cause significant inconveniences and, if caution is not exercised, could lead to life-threatening situations.

WINTER STORM WATCH - Alerts the public to the possibility of a blizzard, heavy snow, heavy freezing rain, or heavy sleet. Winter Storm Watches are usually issued 12 to 48 hours before the beginning of a winter storm.

WINTER STORM WARNING - Issued when hazardous winter weather in the form of heavy snow, heavy freezing rain, or heavy sleet is occurring. Winter Storm Warnings are usually issued 12 to 24 hours before the event is expected.

BLIZZARD WARNING - Issued for sustained or gusty winds of 35 mph or more, and falling or blowing snow creating visibilities at or below 1/4 mile. These conditions should persist for 3 hours.

FROST/FREEZE WARNING - Issued when below freezing temperatures are expected.

LAKE EFFECT SNOW ADVISORY - Issued when accumulation of lake effect snow will cause significant inconvenience.

LAKE EFFECT SNOW WARNING - Issued when heavy lake effect snow is occurring.

WIND CHILL ADVISORY - Issued when the wind chill temperature is forecast to be between -15°F to -24°F.

WIND CHILL WARNING - Issued when the wind chill temperature is forecast to be -25°F or lower.

DENSE FOG ADVISORY - Issued when fog will reduce visibility to ¼ mile or less over a widespread area.

SNOW FLURRIES - Light snow falling for short durations. No accumulation or light dusting is all that is expected.

SNOW SHOWERS - Snow falling at varying intensities for brief periods of time. Some accumulation is possible.

BLOWING SNOW - Wind-driven snow that reduces visibility and causes significant drifting. Blowing snow may be snow that is falling and/or loose snow on the ground picked up by the wind.

Click Here to see if there are any active warnings in your area.

BEFORE A WINTER STORM: Have a disaster plan and prepare a disaster supplies kit for your home and car. Include a first aid kit, emergency food supply, bottled water, battery-operated radio, flashlight, protective clothing, and blankets. Don't forget, be aware of changing weather.

DURING A WINTER STORM: Stay indoors and dress warmly. Eat regularly, because food provides the body with energy for producing its own heat. Also, drink lots of water. If you must go outside, wear layered clothing, mittens and a hat. Watch for signs of hypothermia and frostbite. Remember to keep dry. Always change wet clothing to prevent the loss of body heat. If you must drive, carry a cell phone. Always, keep the gas tank full. Don't forget, let someone know where you're going, just in case your car gets stuck. If you're car gets stuck, stay with it and wait for help unless help is visible within 100 yards. Use maps and car mats to stay warm.

AFTER A WINTER STORM: Avoid driving until conditions have improved. Avoid overexertion! Heart attacks from shoveling snow are the leading cause of deaths during the winter. Also, check on neighbors to make sure they're okay.

In an average winter in the United States, about 100,000 avalanches will tumble down mountainsides. This is why you should always stay on a path and try not to ever venture in the backcountry. In the United States and Canada, crashing walls of white will tumble over about 300 people. Most will be skiers, snowboarders, or snowmobilers who set out to have fun. Many will be buried by snow. Most will survive, although some will not.
SAFETY FIRST:

Never travel alone!

Heed warning signs in avalanche-prone areas.

Stay alert in backcountry areas.

Travel single file, not side by side in the backcountry.

ALWAYS CARRY SAFETY EQUIPMENT:

Make sure you have a long probe, small shovel and always carry an emergency avalanche rescue beacon that signals your location.
IF YOU GET CAUGHT:

Try to get to the side of it.

If you can't, grab a tree as an anchor.

IF YOU GET SWEPT AWAY:

"Swim" with the slide to stay as close to the surface as you can. I know this sounds weird, but this could save your life.

Lesson Plan: Here is a great lesson plan on learning about winter weather. In this activity, kids investigate aspects of winter weather, such as temperature and wind. They familiarize themselves with weather-related words. It's a great activity for K-2nd graders.

Lesson Plan: Here is a great lesson plan on learning about winter weather. In this activity, kids learn how winter storms form and about the different types of fronts. It's a great activity for 3rd-5th graders. Note: This is a PDF file, so you need to have Adobe Acrobat Reader.

Measuring Snow Experiment: Here is a great experiment that lets kids measure snow. They let the snow melt and then measure it again. It teaches kids that snow is very dense and is why it holds more space than water.

Melting Snow Experiment: Here is another experiment that teaches kids the difference between the freezing and melting process. It allows kids to take the temperature of a glass of snow. Then, watch the snow melt and observe how the temperature changed.

Examining Snowflakes Experiment: Here is a great experiment that lets kids see snowflakes up close. They can examine the snowflake's six sides.

Make Dew And Frost Experiment: Here is a great experiment that lets kids make dew and frost. They can see how dew turns into frost in a matter of minutes.

Suck An Egg Into A Bottle Experiment: Here is an experiment that shows how pressure is created in our atmosphere by sucking an egg in a bottle. This is a very cool experiment!

Make Your Own Barometer I Experiment: Here is an experiment that allows the kids to make a barometer.

Make Your Own Barometer II Experiment: Here is an experiment that allows the kids to make a barometer.

Create Evaporation Experiment: Here is an experiment that shows kids how evaporation takes place.

Science Fair Project Ideas: Here is a complete list of science fair project ideas. Discover the science behind the weather that impacts us every day.

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How is snow formed? Snow is commonly formed when water vapor undergoes deposition, which is when water vapor changes directly to ice without first becoming a liquid, high in the atmosphere at a temperature of less than 32°F and then falls to the ground. What are snowflakes? Snowflakes are made of ice crystals.

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A blizzard is a severe snowstorm. It brings low temperatures, strong winds, and a lot of blowing snow. Blizzards start when a high pressure system touches a low pressure system.

The word blizzard is sometimes used incorrectly by news media to talk about big winter storms, even if the storm is not a blizzard.

The difference between a blizzard and a snowstorm is the strength of the wind, not the amount of snow. To be a blizzard, a snow storm must have sustained winds or frequent gusts that are greater than or equal to 56 km/h (35 mph) with blowing or drifting snow which reduces visibility to 400 m or 0.25 mi or less and must last for a prolonged period of time-typically three hours or more.

Some areas are more likely to be hit by blizzards than others, but a blizzard can occur in any place where snow falls. In North America, blizzards happen often in the northern-east states, and in the provinces of Canada. In this region, blizzards can happen more than twice each winter.

They also occur often in the mountain ranges of western North America. Because these regions have low populations, blizzards sometimes are not reported.

A very dangerous type of blizzard is a whiteout. In a whiteout, downdrafts and snowfall are so thick that people cannot tell the ground and sky apart. People caught in a whiteout lose their sense of direction very fast. This is a large danger to pilots when they are flying airplanes, because they cannot tell how close they are to the ground, and may crash.

Who cleans up after blizzards?

The community cleans up after a snowstorm/blizzard occurs. Blizzards only usually go for 3 hours so everything won't be too damaged, meaning it won't be as hard as an earthquake or tsunami to clean.

How deep the snow gets

These horrible blizzards can achieve up to 25-30 feet deep. A basketball hoop is 10 ft high, so a blizzard can get snow as deep as the height of two or three hoops.

How do blizzards occur?

Firstly you need cold enough air to cause snow to fall in the clouds and ground level water and moisture is needed to form clouds and precipitation. The moisture is called water vapour to make the clouds a source of water vapour is cold air blowing across large lakes or the sea but the cold air doesn't actually make too much snow, its a combination of cold and warm air that does it. The warm air normally meets the cold air if the wind is being pulled towards the equator when they are brought together a front is formed and precipitation is formed and the warm air can go up to the clouds and the blizzard forms from there.

How strong are a blizzard's winds?

There is sustained wind or frequent gusts of 35 miles per hour or greater.

How cold can blizzards get?

Blizzards can get down to -12 degrees or lower. This makes it fairly easy to get hypothermia in a blizzard. Mostly freezing electrics and machinery making life very hard in the Hypothermic temperatures.

A blizzard brings strong winds that can cause power outages, damage property and disrupt emergency communication. As a result, people can end up without food and water supply.

Blizzards are dangerous as they may lead to injuries and even deaths on the road due to low visibility.

You should avoid being caught outdoors in a blizzard as skin left exposed to such severe conditions could lose all sensitivity within minutes. As a result, you can suffer from hypothermia and frostbite. In extreme cases it may lead to death.

Blizzards may negatively affect the environment, killing plants and animals that other species rely on in their food chain. This forces some animals to find alternative means of getting food or die if food is scarce.

Blizzards impact accumulation of water vapor in the atmosphere, which then leads to greater precipitation throughout the year.

Famous U.S. blizzards

The Great Blizzard of 1888 was very damaging for the Northeastern United States. In that blizzard, 400 people died, 200 ships sunk, and snowdrifts were 10 or 15 feet high. In the Great Plains, states were hit by the Schoolhouse Blizzard that trapped children in schools and killed 235 people.

In 1880-1881 there was a winter that people in the Dakotas called the "Hard Winter". The author Laura Ingalls Wilder wrote her book The Long Winter about that winter's story. It talks about one blizzard after another, and how it changed Laura's family and everybody around her. The book is almost all true. Her story of two men from the town of DeSmet, South Dakota, going after some wheat stored some miles south of DeSmet in February 1881 is true, and Ingalls later married one of the men, Almanzo Wilder. If the two men had not found and brought back the wheat, the people would have starved. The snow and ice thawed in April, and the railroads could start again. The train picture above was photographed on March 29, 1881, not far from DeSmet.

34 people died during a 3-day spring blizzard on March 1920 in North Dakota. One of the people who died was Hazel Miner, a teenage girl who died of freezing to death when she got lost on her way home from her one-room-school.

The Armistice Day Blizzard in 1940 surprised many people with how fast the temperature dropped. It was 60 °F (15.6 °C) in the morning, but by noon, it was snowing. Some of the people froze to death in the snow. 154 people died in the Armistice Day Blizzard.

105 years after the Great Blizzard of 1888, a giant blizzard, named the Storm of the Century, hit the U.S in 1993. It dropped snow on 26 states and reached as far north as Canada and as far south as Mexico. In many southern U.S. areas, such as parts of Alabama, more snow fell in this storm than ever fell in an entire winter. Highways and airports closed across the U.S. The blizzard also made 15 tornadoes in Florida. When the storm was over, 270 people died and 48 were reported missing.

Other famous blizzards

Related pages

Images for kids

Blizzard into Tochal Skiing resort, Tehran and involved skiers.

Conditions approaching a blizzard whiteout in Minnesota, on March 1, 2007. Note the unclear horizon near the center.

Stereoscopic view card showing "Blasting ice with dynamite from in front of steamer on the ways, by Stanley J. Morrow" ~ A view of Yankton's riverfront after the flood of March 1881.

In Spanish: Ventisca para niños

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Ice storms are weather phenomena caused by freezing rain. The falling rain comes into contact with surfaces and turns into a thin sheet of ice. Ice storms cause accidents, take power lines down and cause serious damage.

The U.S. National Weather Service defines an ice storm as a storm which results in the accumulation of at least 0.25-inch (6.4 mm) of ice on exposed surfaces. From 1982 to 1994, ice storms were more common than blizzards and averaged 16 per year. They are generally not violent storms but instead are commonly perceived as gentle rains occurring at temperatures just below freezing.

It starts with a layer of warmer (not freezing) air above a layer of sub-freezing temperatures lower down. Frozen precipitation melts to rain while falling into the warm air layer, and then begins to refreeze in the cold layer below.

1. If the precipitate refreezes while still in the air, it will land on the ground as sleet.

2. Or, the liquid droplets continue to fall without freezing. They pass through the cold air just above the surface. This thin layer of air cools the rain to a temperature below freezing (0 °C or 32 °F), but the drops themselves do not freeze. This is a phenomenon called supercooling.
When the supercooled drops strike ground or anything else below 0 °C (32 °F) (e.g. power lines, tree branches, aircraft), a layer of ice builds up, hence "freezing rain".

The freezing rain from an ice storm covers everything with heavy, smooth glaze ice. In addition to hazardous driving or walking conditions, branches or even whole trees may break from the weight of ice. Falling branches can block roads, tear down power and telephone lines, and cause other damage. Even without falling trees and tree branches, the weight of the ice itself can easily snap power lines and also break and bring down power/utility poles; even electricity pylons with steel frames. This can leave people without power for anywhere from several days to a month. According to most meteorologists, just one quarter of an inch of ice accumulation can add about 500 pounds (230 kg) of weight per line span. Damage from ice storms is easily capable of shutting down entire metropolitan areas.

Images for kids

A tree covered in ice from the December 2008 Northeastern United States ice storm.

A street in Elora, Ontario, Canada after an ice storm, sometime between 1900 and 1919

A pinecone covered in ice, showing the results of a winter ice storm

A buildup of ice on a branch after an ice storm

A weeping willow tree damaged by an ice storm on February 5, 2014

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Ice storms are weather phenomena caused by freezing rain. The falling rain comes into contact with surfaces and turns into a thin sheet of ice. Ice storms cause accidents, take power lines down and cause serious damage. The U.S.

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Explore weather wonders, climate change, and stuff in the sky. On SkySci for Kids, you can play, watch, read, and do science! This website is open to any young-at-heart learners.

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The sky is dark and the air is thick. Lightning flashes and thunder claps. Winds blow. Heavy rain falls. It's a thunderstorm! The National Storms Laboratory says there are 16 million thunderstorms in the world each year. At any moment, about 2,000 of them are taking place. "Thunderstorms can happen at any time," Patrick Marsh told TFK. He's a weather scientist. "But thunderstorms are more likely in the summer than in the winter."

JAMES MURNAN/NOAA

Forming a Storm

A storm is a powerful of the . Add lightning and thunder into the mix, and it's a thunderstorm. Thunderstorms can be dangerous. They can bring strong winds and hail. Heavy rains can cause flooding. And lightning is very powerful and hot (see "It's Striking!"). It can hurt people.

BEAU VAN DER GRAFF EYEM/GETTY IMAGES

Being aware of the weather can help keep people safe. That's where meteorologists like Marsh come in. Meteorologists are scientists who study the weather. They use tools such as satellites and radar. These tools help them predict when a storm is coming and how bad it will be. By making predictions, meteorologists can warn people when weather is on the way.

What's the best way to stay safe during a thunderstorm? "When you see lightning, it's time to go inside," Marsh told TFK. "And when you're inside, stay away from the windows."

Thunderstorms can be loud and . But they're nothing to be afraid of. "You don't need to be scared of thunderstorms if you take the proper actions," Marsh says. "Just think of thunderstorms as grumpy clouds."

It's Striking!

KEVIN J. SALISBURY/ GETTY IMAGES

Lightning is a quick, powerful burst of electricity. It forms in a storm cloud. Lightning happens fast. And it is more than five times hotter than the sun. Lightning can flash inside a storm cloud. It can flash from one cloud to another. It can also strike the ground.

Thunder is the sound that lightning makes. But we hear a clap of thunder after we see a flash of lightning. That's because light travels much faster than sound.

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The sky is dark and the air is thick. Lightning flashes and thunder claps. Winds blow. Heavy rain falls. It's a thunderstorm! The National Severe Storms Laboratory says there are 16 million thunderstorms in the world each year. At any...

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Download a poster of this animation!

Video transcript

What causes a thunderstorm?

You've probably seen a big thunderstorm cloud roll into town. The thunder, lightning, heavy rain, and gusty winds are hard to miss!

But where did that thunderstorm come from?

All thunderstorms follow the same recipe. To form, these storms require three basic ingredients:

Moisture, unstable air and lift.

Moisture in the air typically comes from the oceans-and areas near warm ocean currents evaporate lots of moisture into the air.

Moisture in the air is also responsible for making clouds.

Unstable air forms when warm, moist air is near the ground and cold, dry air is up above.

To create a thunderstorm, the unstable air needs to have a nudge upward.

This lift usually comes from differences in air density. Warmer, less dense air rises upward, creating lift.

As the air lifts higher and higher, it causes a storm cloud to grow taller and taller. Thunderstorm clouds can rise up to 10 miles into the air!

In a big thunderstorm cloud, there are now strong upward winds and downward winds happening at the same time. These are called updrafts and downdrafts.

This is the most dangerous stage of the storm, when tornadoes, hail, winds and flooding can happen.

Updrafts continue to fuel the storm with warm, moist air. But, once a storm runs out of updrafts, it starts to weaken.

As a storm begins to slow down, the rain and wind become less intense.

And by the end, all that's left is a blue sky and an anvil-shaped cloud top.

Phew! Glad that's over!

Sure, a storm will probably come again, but you don't need to worry! Forecasters can use weather satellites, like those in NOAA's GOES-R series, to monitor clouds as they grow into thunderstorms. GOES satellites watch out for lightning, too.

These satellites are constantly watching for severe weather-and the information they gather can help people stay safe during storms.

# data[].attributes.attachment_link.description
What causes a thunderstorm? You've probably seen a big thunderstorm cloud roll into town. The thunder, lightning, heavy rain, and gusty winds are hard to miss! But where did that thunderstorm come from? All thunderstorms follow the same recipe. To form, these storms require three basic ingredients: Moisture, unstable air and lift.

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It may not capture your attention, fear or fascination like a landfalling hurricane or tornado outbreak, but hail is consistently one of the most damaging weather phenomena every year.

Its annual cost to America's insurers, homeowners and farmers runs in the billions of dollars.

"Over the past few years, according to industry sources, we've seen $8-10 billion in insured and agricultural losses annually from hail alone," said Bryan Wood, meteorologist and operations analyst with Assurant, Inc.

Some of this can be attributed to the sheer number of severe thunderstorms in the U.S.

From 2009 through 2018, an average of 6,525 reports of large hail were received by National Weather Services offices each year.

Large hail is defined by the NWS as hail at least 1 inch in diameter, roughly the size of a quarter. Hail this size or larger is capable of more significant property damage.

In a few cases, a single hailstorm can be a destructive, billion-dollar event.

"If you get a significant hail swath traversing a densely-populated area at peak time of day, you're looking at a potentially catastrophic event loss," said Steve Bowen, meteorologist with Aon Benfield.

One recent example occurred on June 6, 2018, when hail up to the size of baseballs fell in the Dallas-Fort Worth metro area, causing $1 billion in damage.

Another example of this was a pair of hail events across the Omaha, Nebraska, metro area on June 30, 2017.

Hail up to the size of baseballs in Denver on May 8, 2017, was the costliest weather disaster in state history, responsible for $1.4 billion in insured losses, the Rocky Mountain Insurance Information Association estimated.

Just over a month later, a hailstorm in the northern suburbs of Minneapolis was estimated to be responsible for almost $1 billion in damage, at least the third costliest storm in state history, according to the Insurance Federation of Minnesota.

Paced by multiple events in spring, Texas suffered record hailstorm losses in 2016.

The costliest hailstorm in U.S. history hit the Phoenix metro area on Oct. 5, 2010. An estimated $2.8 billion in damage was caused by that storm, according to NOAA's storm events database. Hailstones up to three inches in diameter were measured in the West Chandler area.

In April of 2001, a single supercell thunderstorm with hail up to three inches in diameter tracked across St. Louis. The storm began in west-central Missouri and produced five tornadoes, damaging winds and then the hailstorm in St. Louis. Total insured losses alone were estimated to be $2.2 billion.

Two more of the costliest hailstorms on record were in Minneapolis, Minnesota, in May 1998 ($1.73 billion in insured losses) and the infamous Mayfest hailstorm in Fort Worth, Texas, in May 1995 ($2 billion in damage).

Bowen said the time of day is an important factor in hailstorm losses.

"If an event happens overnight, there is a possibility of reducing the cost due to vehicles being parked in garages. As compared to a late weekday afternoon when cars are parked in open lots or residents are driving home during rush hour," he said.

In other words, the combination of numerous damaged vehicles and homes usually adds up to the costliest hailstorms.

What a Hailstorm Can Do

Your Home

As a general rule of thumb, damage to roof shingles can occur with hail as small as quarter-size (1-inch diameter).

"When hail hits a roof, the entire roof is replaced even if there is partial damage," said Bryan Wood of Assurant, Inc.

That can cost about $5,000 to $10,000.

In rare cases of softball-size hail, typically found only in the Plains states a few times a year, hailstones can punch through the roof, leading to water damage in a home's interior.

( MORE: String of Damaging Spring 2016 Hailstorms)

Winds only worsen the damage potential.

Wood said that wind-driven hailstones can damage not only the roof, but also a home's siding, windows and doors.

"In these type of events, the damage (to a home) can exceed $30,000."

Your Vehicle

Typically, hail of golf-ball size- roughly 1.75 inches in diameter - begins to leave dents on vehicles.

Smashed windshields, not simply large cracks, typically result from hail of baseball-size or larger.

In some cases, the damage from hail can render a vehicle undriveable.

Roughly half the vehicles damaged in the May 2017 Denver hailstorm weren't drivable afterward, the Denver Post reported.

If you have time to do so safely, pull your vehicle into a garage, carport or parking garage when a severe thunderstorm warning for your area mentions large hail, no matter the size.

( MORE: Don't Ignore Severe Thunderstorm Warnings)

This may save you the hassle of repairing or replacing your vehicle and filing an insurance claim while hundreds, if not thousands of others are doing the same.

The Rocky Mountain Insurance Information Association has a list of steps to take if your home or vehicle is damaged by a hailstorm.

Your Field

As destructive as hailstorms can be to your property, they can be devastating to crops.

Depending on the size of the field and the hail swath, damage can range from moderate to a total loss.

As with homes and vehicles, high winds only make the damage worse.

In hail-prone areas of the country, farmers typically carry insurance either specifically for hail damage, or a multiple-peril policy to insure against a number of threats such as high winds, fire, and hail.

The future looks no less costly from hailstorms.

"Since the 1970s, the average square footage of a home has increased from 1,500 to about 2,200 square feet," said Wood. "As homes get bigger, there is more surface area to be damaged."

Then there's suburban sprawl.

"With increasingly dense populations found in the most vulnerable convective storm belts of the country combining with increasingly intense hail events, that is a recipe for more costly events," said Bowen.

Essentially, Wood said there are increasingly more targets to be hit because of population growth.

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Hail: The Most Underrated Costly Weather Disaster | The Weather Channel - Articles from The Weather Channel | weather.com

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It may not capture your attention, fear or fascination like a landfalling hurricane or tornado outbreak, but hail is consistently one of the most damaging weather phenomena every year. Its annual cost to America's insurers, homeowners and farmers runs in the billions of dollars.

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19 of the biggest hailstorms that ravaged the US over the years

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Major hailstorms can wreak havoc on communities — and often cause billions of dollars of destruction.

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Learn how to drive in a hail storm, including tips for driving in moving traffic and where to park your car to avoid damaging it.

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