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Graphic: How does a tornado form? Add to ...

A U.S. storm system that spawned a chain of deadly tornadoes over three days flattened homes and businesses, forced frightened residents in more than half a dozen states to take cover and left tens of thousands in the dark.

How do tornados form?


What areas were hardest hit?

1. One person killed in farm building collapse believed to be wind-related
2. More than 100 homes and businesses damaged, 25 people injured
3. One person killed; about 60 buildings damage
4. Twisters with winds above 215 km/h carve an 130-mile path toward Little Rock suburbs of Vilonia and Mayflower, killing 14 people

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