Here’s what we know.
The area at highest risk for tornadoes stretches 750 miles from Davenport, Iowa, to Jackson, Mississippi.
Predictions include gusts of 70-90 mph and hail that could get as big as golf balls.
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Tornadoes are most likely to appear on the Virginia coast and in North and South Carolina.
Strong winds and hail could occur anywhere on the East Coast from Jacksonville, Florida up to New York.
