Violent tornadoes ripped through parts of the U.S., wiping out schools and toppling semitractor-trailers in several states.
About 47 million people faced an enhanced to moderate severe storm threat from Madison, Wisconsin, to Birmingham, Alabama.
Today will be windy with showers and storms. Storms could be severe with high gusts. Isolated tornadoes are possible.
On Saturday, early morning fog will thin, but skies will remain cloudy with a thick marine layer mainly near the shore.
When it comes to severe weather events like tornadoes and flash floods, what's the difference between a watch and warning, and which is worse?
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