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To be a tornado it must touch the ground. It can touch down for a few seconds or grind across the earth for miles. Tornadoes usually last less than 10 minutes.

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flip cars, cross rivers, dig 3 foot (0.9 meter) trenches, and lift lightweight objects 10,000 feet (3048 meters) into the air. A tornado is a lethal combination of wind and power.

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Tornadoes demolish houses, flip cars, cross rivers, dig 3 foot (0.9 meter) trenches, and lift lightweight objects 10,000 feet (3048 meters) into the air

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Tornadoes demolish houses, flip cars, cross rivers, dig 3 foot (0.9 meter) trenches, and lift lightweight objects 10,000 feet (3048 meters) into the air. A tornado is a lethal combination of wind and power. Tornadoes touch down all over the world, though most often in the United States.

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https://www.youtube.com/watch?v=EpuDYZ_g0yg

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Most tornadoes start from a supercell. A supercell is a rotating thunderstorm (called a mesocyclone). Supercells create the deadliest tornadoes.

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Tornados are measured by Fujita Scale or F-Scale they invented this in 1971.

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A tornado is often a funnel cloud—a rotating column of air— that stretches from a storm to the ground.

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 Most of the world’s tornadoes occur in the United States in what’s known as Tornado Alley. Stretching from west Texas to North Dakota, this area can see more than 200 tornadoes each year!

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Tornadoes demolish houses, flip cars, cross rivers, dig 3 foot (0.9 meter) trenches, and lift lightweight objects 10,000 feet (3048 meters) into the air. A tornado is a lethal combination of wind and power. Tornadoes touch down all over the world, though most often in the United States.

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The tornados normally ocure at the tornado seoson. and some times is supercell

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In the United States most tonadoes hit in the central part of the country .

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tornados are vertical funnels of rapidly spinning

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Tornadoes are vertical funnels of rapidly spinning air. Their winds may top 250 miles an hour and can clear a pathway a mile wide and 50 miles long.

Also known as twisters, tornadoes are born in thunderstorms and are often accompanied by hail. Giant, persistent thunderstorms called supercells spawn the most destructive tornadoes.

These violent storms occur around the world, but the United States is a major hotspot with about a thousand tornadoes every year.

" Tornado Alley," a region that includes the area in the eastern state of South Dakota, Nebraska, Kansas, Oklahoma, northern Texas, and eastern Colorado, is often home to the most powerful and destructive of these storms. U.S. tornadoes cause 80 deaths and more than 1,500 injuries per year.

What is a tornado?

A tornado is a violently rotating column of air that extends from a thunderstorm to the ground. It's often portended by a dark, greenish sky. Black storm clouds gather. Baseball-size hail may fall. A funnel suddenly appears, as though descending from a cloud. The funnel hits the ground and roars forward with a sound like that of a freight train approaching. The tornado tears up everything in its path.

Every U.S. state has experienced twisters, but Texas holds the record: an annual average of 120. Tornadoes have been reported in Great Britain, India, Argentina, and other countries, but they are most often seen in the United States.

Related to tornadoes, waterspouts are weak twisters that form over warm water. They sometimes move inland and become tornadoes.

Dust devils are small, rapidly rotating columns of air that are made visible by the dust and dirt they pick up. Dust devils are not associated with thunderstorms. Either are fire tornadoes, which can spawn from wildfires.

What causes tornadoes?

The most violent tornadoes come from supercells, large thunderstorms that have winds already in rotation. About one in a thousand storms becomes a supercell, and one in five or six supercells spawns off a tornado.

Tornadoes can occur at any time of year, but they are more common during a distinct season that begins in early spring for the states along the Gulf of Mexico. The season follows the jet stream -as it swings farther north, so does tornado activity. May generally has more tornadoes than any other month, but April's twisters are sometimes more violent. Farther north, tornadoes tend to be more common later in summer.

Although they can occur at any time of the day or night, most tornadoes form in the late afternoon. By this time the sun has heated the ground and the atmosphere enough to produce thunderstorms.

Tornadoes form when warm, humid air collides with cold, dry air.

The denser cold air is pushed over the warm air, usually producing thunderstorms. The warm air rises through the colder air, causing an updraft. The updraft will begin to rotate if winds vary sharply in speed or direction.

As the rotating updraft, called a mesocycle, draws in more warm air from the moving thunderstorm, its rotation speed increases. Cool air fed by the jet stream, a strong band of wind in the atmosphere, provides even more energy.

Water droplets from the mesocyclone's moist air form a funnel cloud. The funnel continues to grow and eventually it descends from the cloud. When it touches the ground, it becomes a tornado.

Characteristics of tornadoes

Twisters are usually accompanied or preceded by severe thunderstorms and high wlnds. Hail is also common.

Once a tornado hits the ground, it may live for as little as a few seconds or as long as three hours.

The average twister is about 660 feet wide and moves about 30 miles an hour. Most don't travel more than six miles before dying out.

Massive tornadoes, however-the ones capable of widespread destruction and many deaths-can roar along as fast as 300 miles an hour.

These measurements are scientists' best estimations. Anemometers, which measure wind speed, cannot withstand the enormous force of tornadoes to record them.

Using units F0 to F5, the Fujita scale measures a tornado's intensity by analyzing the damage the twister has done and then matching that to the wind speeds estimated to produce comparable damage. The United States now uses the EF (Enhanced Fujita) scale, which takes more variables into account when assigning wind speeds to a tornado.

Tornado destruction

Every year in the United States, tornadoes do about 400 million dollars in damage and kill about 70 people on average.

Extremely high winds tear homes and businesses apart. Winds can also destroy bridges, flip trains, send cars and trucks flying, tear the bark off trees, and suck all the water from a riverbed.

High winds sometimes kill or injure people by rolling them along the ground or dropping them from dangerous heights. But most tornado victims are struck by flying debris-roofing shingles, broken glass, doors, metal rods.

The number of average deaths per year in the United States used to be higher before improved forecasting and warning systems were put into place.

How tornadoes are forecasted

Meteorologists at the U.S. National Weather Service use Doppler radar, satellites, weather balloons, and computer modeling to watch the skies for severe storms and tornadic activity.

Doppler radars record wind speeds and identify areas of rotation within thunderstorms. Since Doppler radar has been in use, the warning time for tornadoes has grown from fewer than five minutes in the 1980s to an average of 13 minutes by the late 2000s.

When weather conditions are conducive for tornado formation, the National Weather Service issues a tornado watch. When a tornado has been sighted or indicated on radar, a tornado warning is issued.

Some scientists, meteorology buffs, and adrenaline junkies hit the road during tornado season to chase storms. Researchers race to place sensors in tornadoes' paths. The sensors measure data such as wind speed, barometric pressure, humidity, and temperature.

The challenge for researchers is being in the right place at the right time. Every morning they study weather conditions and head for the area that seems most likely to spawn a twister. They drive through severe storms, dodge lightning, face flash floods, and get pounded by hail-sometimes for years-before ever spotting a tornado.

All at considerable risk. In 2013, National Geographic Explorer Tim Samaras and his team were killed while trying to study a tornado in Oklahoma. ( See photos of Samaras's work.)

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Learn how these deadly storms form and wreak havoc, and how you can reduce your risk.

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the tornadoes starts on the cloud and go to earth

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in any time of the year.

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How do tornadoes form and why do we fear them so much? Tornadoes are the most violent storms that our weather can produce. They occur in very large thunderstorms under specific weather conditions. The United States sees roughly 1,200 tornadoes every year. They occur most often in the spring and early summer, and the most common times for them to occur are between 4 and 9 PM.

Tornadoes during rush hour are particularly dangerous because they can catch travelers unaware in their cars. This article will answer your questions about tornadoes including "how do tornadoes form?".

What is a Tornado?

Tornadoes are measured by the Enhanced Fujita Scale. This scale is a more accurate version of the original Fujita scale, named after Dr. Ted Fujita who was a pioneer in discovering how do tornadoes form.

Tornadoes on this scale are given a rating from F0 to F5. The ratings were based on the severity and type of damage the tornado inflicts. As tornado research advanced, a panel of structural engineers and meteorologists used their collective experience with their knowledge of how do tornadoes form to improve the Fujita Scale and more accurately assess wind speeds.

The Enhanced Fujita scale has been in place since 2007 and rates wind speeds as followed:
EF-0: 65 to 85 MPH
EF-1: 86 to110 MPH
EF-2: 111 to135 MPH
EF-3: 136 to165 MPH
EF-4: 166 to 200 MPH
EF-5: 200+ MPH

An EF-5 tornado is incredibly devastating, able to destroy buildings and level well-built houses to the foundations. If you see clean slabs or foundations in the damage path of a tornado, it is likely an EF-5. EF-5s are rare, composing less than 1% of all tornadoes, but some unfortunate towns have seen more than their fair share. Moor Oklahoma suffered 2 F5 tornadoes-one in 1999 and the next in 2013.

How Do Tornadoes Form?

There was very little research to answer the question of how do tornadoes form until recently. With the development of special equipment and cars that can withstand the brute force of strong storms, intrepid storm chasers have added a wealth of knowledge to this research area over recent years.

When cold air fronts meet warm air, the accompanying storms combine to form a supercell. In this situation, warm air rises as cold air falls. If the temperature differences are extreme enough, this pattern of circulation happens so fast that it causes a tornado to appear. At this point, the answer to how do tornadoes form follows a very specific and predictable pattern:

First, the wind changes direction and wind speed increases.

As the change in wind speed increases in altitude, a horizontal spinning starts at the lower atmosphere.

Then, the air rises with the thunderstorms updrafts, causing the horizontal rotation to become vertical.

Finally, the lower cloud base becomes a wall cloud and a tornado forms. The area of rotation can be from 1 to 6 miles wide, wreaking an incredible path of destruction that can leave a house completely undamaged on one side of the street while completely destroying the house on the other.

Tornadoes carry out a particular lifecycle once they have formed. First, the rotating air (called the mesocyclone) starts moving toward the ground with the rear flank downdraft. Then, a small funnel builds at the lowest part of the wall cloud. When the rear flank downdraft hits the ground, the tornado becomes visible as it lifts dirt and debris. This is the point at which the funnel touches the ground and a tornado is officially formed.

The path of the tornado at this point depends on the rear flank downdraft. If it runs out of warm air, the tornado dies. This is why the most violent tornadoes occur with the most extreme temperature differences between cold and warm fronts.

Where Do Tornadoes Occur Most Often?

Tornadoes have occurred on literally every continent except for Antarctica. When studying how do tornadoes form, it is best to look at the latitudes between 30 degrees and 50 degrees in both hemispheres. This is where clashes between cold and warm fronts are most likely to take place.

In the U.S.A.

The United States is the tornado's favorite stomping ground, with more than 1,200 occurrences a year. Most take place in the infamous tornado alley, which stretches throughout the central part of the nation in the Midwest. In contrast, Canada only sees roughly 100 tornadoes in a given year.

Of the Midwestern states, Texas and Oklahoma suffer the largest number of tornado outbreaks, with some areas averaging 9 or more tornadoes per 10,000 square miles per year. Florida, Indiana and Nebraska run a close second with 7 tornadoes per square mile per year. All of the states in tornado alley can expect at least three major tornadoes per 10,000 square miles per year, so most residents take precautions such as building specialize underground storm shelters or reinforced basements to shelter from the damaging winds and debris.

In states where basements are impractical because of extreme fluctuations in temperature, humidity and soil composition, tornado shelters usually consist of "hidey holes." These shelters shallowly buried outside, close to the back door and are only large enough to provide short-term refuge for a family of four. They are usually made of plastic or metal and provide very secure protection from even F5 tornadoes for the duration of the storm.

Worldwide

Tornadoes are a rare occurrence in the rest of the world. New Zealand only sees roughly 20 or 30 in a year. Europe, Argentina, Africa, Australia, China, Japan, Bangladesh, Nepal and the Philippines all experience tornadoes, but they are a rare event compared to frequency in the United States Midwest.

It is highly recommended that any person who lives in a tornado prone area have underground protection from these storms. If no underground protection is available, the next best option is a bathtub with a mattress for protective covering. Failing that, the interior room of a building will have to do. Never try to weather a tornado in a car. The force of a direct tornado hit to a car can be equivalent to a 200 MPH crash. It is best to exit the vehicle and find a shallow ditch to wait out the storm.

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How Do Tornadoes Form and Where Do They Occur Most?

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How do tornadoes form and why do we fear them so much? Tornadoes are the most violent storms that our weather can produce. They occur in very large thunderstorms under specific weather conditions. The United States sees roughly 1,200 tornadoes every year.

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the tornadoes measure normaly 10 or 50 meters

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Tornadoes are formed when hot air and cold air meet in a powerful storm, and the warm air begins spiralling upward, creating a funnel cloud.

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Tornadoes form when warm, humid air collides with cold, dry air. The denser cold air is pushed over the warm air, usually producing thunderstorms. The warm air rises through the colder air, causing an updraft. The updraft will begin to rotate if winds vary sharply in speed or direction.

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tornados normally occur in North America in a specific place like U.S.A

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enter in the link ans see the video of the tornadoes

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The Fujita Scale is a common way of measuring the strength of tornadoes. The scale ranges from F0 tornadoes that cause minimal damage through to F5 tornadoes which cause massive damage. Most tornadoes have wind speeds less than 100 miles per hour (161 kilometres per hour).

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Tornadoes are measured using the Fujita Scale. This is done by looking at the damage the tornado has caused and estimating the wind speeds. A rating is then assigned, ranging from F0 for the weakest tornadoes to F5 for the strongest. In the United States the Fujita scale has been replaced by the Enhanced Fujita scale, which ranges from EF0 to EF5.

On rare occasions Doppler radar can be used to obtain a wind measurement. In Even rare instances a probe using an anemometer may take direct measurements from inside the tornado.

On rare occasions barometers and anemometers have taken measurements from tornadoes as well.

However, the majority of tornadoes have their winds estimated based on damage rather than directly measured.

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Tornadoes are measured using the Fujita Scale. This is done by looking at the damage the tornado has caused and estimating the wind speeds. A rating is then assigned, ranging from F0 for the weakest tornadoes to F5 for the strongest.

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this is a tonado

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Tornado strength is currently measured on what is called the Enhanced Fujita Scale (adapted from the simpler Fujita Scale in 2007), which gives the tornado a rating from 0 to 5 based on estimated wind speeds and the severity of the damage.

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Tornado can pay for everything you see and break car houses and more.

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It starts when there are black clouds and lithning in water some times

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In extreme cases, tornadoes can travel at a destructive speed of above 300 miles per hour.

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Most tornadoes are found in the Great Plains of the central United States – an ideal environment for the formation of severe thunderstorms. In this area, known as Tornado Alley, storms are caused when dry cold air moving south from Canada meets warm moist air traveling north from the Gulf of Mexico.

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Tornadoes demolish houses, flip cars, cross rivers.
Tornados form when warm, humid air collides with cold, dry air.

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Encyclopædia Britannica, Inc.

The average tornado-a mostly harmless cyclone of air that connects a storm cloud above and Earth's surface below-has a lifespan of only a few minutes. However, when they move away from the average, tornadoes are considered some of the most-destructive weather events in the world. The wildest of tornadoes can last for hours and span miles in diameter, reaching up to 300 miles (480 km) per hour in speed. In order to be prepared for these powerful twisters, meteorologists (scientists who study atmospheric weather patterns) have spent decades investigating the causes of tornadoes. While the exact conditions are different for each, in order to understand how a tornado forms, we must first understand the storm that is essentially its parent-the supercell thunderstorm.

A supercell, unlike a regular ole thunderstorm, contains the most-important ingredient in the making of a tornado: a spinning column of air at its center, called a vortex. As a supercell grows in size, the vortex in the middle will begin to tilt, siphoning warm air and moisture upward and spewing out cold dry air toward the ground. The updraft of warm air causes the vortex to swell with water vapor, creating a spiraling funnel cloud at its center-the first visible sign that a tornado is brewing. The cool downdraft of air then battles the funnel cloud's upward spiral, focusing the cloud into a smaller area and increasing its speed. With enough pressure and weight from the downdraft of cool air, the quickening funnel cloud is forced to touch down on the ground, and a tornado is officially born.

By understanding the signs of a tornado in the making, meteorologists can issue warnings and signals to areas that might soon become a little too familiar with one. Weather- surveillance systems such as Doppler radars use a technology similar to echolocation that reflects pulses off water vapor in the air to record the speed and movement of a storm. These systems allow scientists to detect the telltale spiraling of supercell thunderstorms long before a funnel cloud is ever seen.

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The average tornado-a mostly harmless cyclone of air that connects a storm cloud above and Earth's surface below-has a lifespan of only a few minutes. However, when they move away from the average, tornadoes are considered some of the most-destructive weather events in the world.

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Tornados normally ocurs in United States

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Tornadoes have been documented on every continent except Antarctica. Tornadoes tend to occur in the middle latitudes in both hemispheres, between 30° and 50°. These latitudes are regions where the warmer subtropical warm air meets the colder polar air, with different wind speeds and direction. These conditions can produce rotating air masses.

Tornadoes most frequently occur in the United States, which sees about 1,000 per year. The tornadoes usually occur in the southeastern state of Florida or in "Tornado Alley", the central part of the country (Midwest) where most of the violent tornadoes occur. Canada is a distant second with about 100 per year. Twenty to thirty tornadoes per year are reported in New Zealand. Most of Europe is susceptible to tornadoes, as are Argentina, South Africa, Australia, Bangladesh, Nepal, eastern China, Japan, and the Philippines.

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Tornadoes have been documented on every continent except Antarctica. Tornadoes tend to occur in the middle latitudes in both hemispheres, between 30° and 50°. These latitudes are regions where the warmer subtropical warm air meets the colder polar air, with different wind speeds and direction. These conditions can produce rotating air masses.

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are most common in ... Worldwide, most tornadoes occur in the late afternoon, between 3 pm and 7 pm local time, with a peak near 5 pm. Destructive tornadoes can occur

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A tornado is a storm with lithning that spins

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It need a warm and umid air mass and a cold air mass.

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For a tornado to form, two things are needed--a warm, humid air mass, and a cold, dry air mass. Thunderstorms usually contain large swells of warm air. When the warm air moves upward into an area of cold air, instabilities will begin to form. The cap of cold air will eventually give way, causing the storm winds to begin spinning. This will create a funnel shaped cloud. If that funnel cloud touches the ground, it becomes a tornado. A tornado is classified as any rotating column of air which is connected to both a cumiliform cloud and the ground. The average tornado has winds of 110 miles per hour and is about 250 feet across. Most tornadoes travel for a distance of about one mile before dissipating. However, these storms are highly unpredictable and can't be relied upon to conform to average statistics.

The strength of a tornado is measured using a system called the Enhanced Fujita Scale. These violent storms are ranked anywhere from F0 to F5. A tornado must have winds speeds in excess of 200 miles per hour to classify as F5. Eighty percent of tornadoes in the United States are F0 or F1. During an F0 tornado, there is only minor damage. Buildings may suffer broken windows and trees may suffer broken branches or be uprooted is they have very shallow roots. During an F1 tornado, cars may be pushed off the road. Motor homes will suffer severe damage and buildings may experience seriously damaged roofs. Each successive Fujita scale rating denotes higher wind speeds and greater damage from the storms. An F5 tornado is very rare, but will cause almost complete destruction of anything in its path.

More tornadoes form in the United States than in any other country in the world. Of these, the majority are found in an area known as Tornado Alley. Though Tornado Alley has no officially designated area, it is usually considered to encompass the plains area between the Rocky and Appalachian mountains. The Midwest region of the United States sees a high concentration of tornadoes as well. Though tornadoes are most common in these areas, they have been reported in every state in the United States. Because tornadoes here are caused by a collision of the warm, moist air from the Gulf of Mexico, and the cold dry air from Canada, the season for tornadoes varies by location. In the plains states, tornadoes are most common in the springtime. The northern states experience the greatest number of tornadoes in the summer, while the southern states tend to experience them in the late fall and winter months. Though the statistics can tell us the most likely time and place for a tornado, there is no real method for predicting these deadly storms. Tornadoes are considered to be especially dangerous because meteorologists are frequently unable to predict their occurrence in time to warn those in the path.

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For a tornado to form, two things are needed--a warm, humid air mass, and a cold, dry air mass. Thunderstorms usually contain large swells of warm air. When the warm air moves upward into an area of cold air, instabilities will begin to form.

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a Tornado is a tropical storm

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It normally occur in may and june but it can happen any time of the year

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This is a tornado

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A tornado is a rapidly rotating column of air that is in contact with both the surface of the Earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus cloud.

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if not understand A tornado is a meteorological phenomenon that manifests itself as a column of air that turns violently and potentially dangerous, being in contact with both the Earth's surface and a cumulonimbus cloud or, exceptionally, with the base of a cumulus cloud

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what  is a tonados. this picture explene the 3 categoris of the tornados.

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This is a TORNADO

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A tonrnado nomaly occures in south central north america

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A tornado is a rotating air colum that rotates violentment one is in contact with the ground.