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Shows the geometry of the earth and sun over the course of a year, demonstrating how seasons occur. This simulator allows both orbital and celestial sphere representations of the seasonal motions.

Running this animation on your computer...

1. right-click to download eclipticsimulator.swf and eclipticsimulator.html to the same directory

2. open the html file in a browser to run the animation

Linking to this animation...

copy and paste the code below into your webpage or blog:

Putting this animation on your website...

1. upload eclipticsimulator.swf to the same directory as your webpage

2. copy and paste the following code into your webpage:

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Shows the geometry of the earth and sun over the course of a year, demonstrating how seasons occur. This simulator allows both orbital and celestial sphere representations of the seasonal motions. Running this animation on your computer... right-click to download eclipticsimulator.swf and eclipticsimulator.html to the same directory open the html file in a browser to run the animation Linking to this animation...

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This service is has been removed. Please update your bookmarks to point to www.weather.gov.

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Current Surface Weather Map" open in one tab and c lick on the " Satellite Images" site so that it opens in another tab. Under "Infrared" in the "East CONUS" column to view the Eastern part of the U.S. (The "CONUS" stands for the continental U.S.) Click on the "View Loop" link.

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How do greenhouse gases affect the climate? Explore the atmosphere during the ice age and today. What happens when you add clouds? Change the greenhouse gas concentration and see how the temperature changes. Then compare to the effect of glass panes. Zoom in and see how light interacts with molecules.

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This service is has been removed. Please update your bookmarks to point to www.weather.gov.

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wind map temporarily offline, data not up to date. Back soon!

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If the map is missing, we recommend the latest Chrome browser.

An invisible, ancient source of energy surrounds us-energy that powered the first explorations of the world, and that may be a key to the future. This map shows you the delicate tracery of wind flowing over the US.

Wind map prints are available from Point.B Studio.

Read more about wind and about wind power.

The wind map is a personal art project, not associated with any company. We've done our best to make this as accurate as possible, but can't make any guarantees about the correctness of the data or our software. Please do not use the map or its data to fly a plane, sail a boat, or fight wildfires :-)

If the map is missing or seems slow, we recommend the latest Chrome browser.

Surface wind data comes from the National Digital Forecast Database. These are near-term forecasts, revised once per hour. So what you're seeing is a living portrait. (See the NDFD site for precise details; our timestamp shows time of download.) And for those of you chasing top wind speed, note that maximum speed may occur over lakes or just offshore.

If you're looking for a weather map, or just want more detail on the weather today, see these more traditional maps of temperature and wind.

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wind map temporarily offline, data not up to date. Back soon! 1 mph 3 mph 5 mph 10 mph 15 mph 30 mph If the map is missing, we recommend the latest Chrome browser. An invisible, ancient source of energy surrounds us-energy that powered the first explorations of the world, and that may be a key to the future.

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earth :: a global map of wind, weather, and ocean conditions

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See current wind, weather, ocean, and pollution conditions, as forecast by supercomputers, on an interactive animated map. Updated every three hours.

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simulation lesson with graphics

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Part A: Planetary Circulation Patterns Seeing the atmosphere through the clouds Ocean currents transport the remainder of the heat. These currents include both surface, or wind-driven currents, and thermohaline ...

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Balloon, bottle and Ice demo/lab

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frozen precipitation and more

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Will it rain, sleet, or snow? | UCAR Center for Science Education

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When meteorologists forecast a winter storm one of the important questions they must answer is: will there be rain, snow, sleet, or freezing rain? That's often a challenging question. Because that water freezes at 32°F (0°C), a couple of degrees change in temperature can mean an entirely different form of precipitation.

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Virtual ballooning to explore the atmosphere.

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Planetary Atmospheres

Earth is not the only world with an atmosphere. Each of the planets - and even a few moons - in our solar system have an atmosphere. Some planets have active atmospheres with clouds, wind, rain and powerful storms. Scientists use light spectroscopy to observe the atmospheres of planets and moons in other solar systems .

Each of the planets in our solar system has a uniquely structured atmosphere. The atmosphere of Mercury is extremely thin and is not very different from the vacuum of space. The gas giant planets in our solar system - Jupiter, Saturn, Uranus and Neptune - each have a thick, deep atmosphere. The smaller, rocky planets - Earth, Venus and Mars - each have thinner atmospheres, hovering above their solid surfaces. The moons in our solar system typically have thin atmospheres, with the exception of Saturn's moon, Titan. Air pressure at the surface of Titan is higher than on Earth! Of the five officially recognized dwarf planets, Pluto has a thin atmosphere that expands and collapses seasonally, and Ceres has an extremely thin and transient atmosphere made of water vapor.

But only Earth's atmosphere has the layered structure that traps enough of the Sun's energy for warmth while also blocking much of the harmful radiation from the Sun. This important balance is necessary to maintain life on Earth.

© 2021 UCAR

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The atmosphere is a mixture of gases that surrounds the planet. Without the atmosphere, life on Earth wouldn't be possible.