John Hart, lead forecaster at the Storm Prediction Center, part of the National Weather Service in Norman, Oklahoma, gives CNET's Daniel Terdiman an an up-close look at how the federal government evaluates ever-changing weather in the Continental United States in order to forecast the kinds of storms -- tornadoes and severe thunderstorms, for the most part -- that cause the most danger to people's lives and property. Oklahoma, of course, is in the heart of Tornado Alley, the area of the Great Plains that is the most-frequently hit by those most destructive of weather events.

The Storm Prediction Center is part of the National Weather Service, and is funded by NOAA, the National Oceanic and Atmospheric Administration.

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