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Properties of the Atmosphere
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The Development of High- and Low-Pressure Systems
Airmasses and Fronts
Extratropical Cyclones Forming East of the Rocky Mountains
Extratropical Cyclones Forming Along the East and Gulf Coasts
Freezing Precipitation and Ice Storms
Lake Effect Snowstorms
Cold Waves
Great Plains Blizzards
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Mountain Windstorms
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El Niño, La Niña, and the Southern Oscillation
Tropical Cyclones
Floods
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Heat Waves

Extratropical Cyclones Forming East of the Rocky Mountains

Example of an Alberta Clipper: View animations of sea level pressure and temperature, national radar, and 850mb and 300mb upper air maps of an Alberta Clipper.
2004 Rocky Mountain Cyclone: A strong Rocky Mountain cyclone developed in 2004. Some of the severe weather that developed as a result included one tornado, large hail and high winds in the vicinity of Lake Michigan.
Example of Cutoff Low: Observe the persistence of a cutoff low by viewing visible satellite imagery and radar animations of the entire United States and a zoomed in view of the Midwest, where the low was centered.
Edition 1 - Example of Rocky Mountain Cyclone: View the evolution of a Rocky Mountain cyclone in animations of 300mb and 850mb upper air maps, surface temperature and dewpoint temperature, national radar, sea level pressure and wind vectors, and satellite animations of the visible, infrared, and water vapor channels.
Related Web Sites
WW2010 Guide to Mid-Latitude Cyclones Learn more about the development and evolution of mid-latitude cyclones.

Department of Atmospheric Sciences Severe and Hazardous Weather at Department of Atmospheric Sciences University of Illinois
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