Watch Out: Tornado Alley Is Migrating Eastward
Briefly

Roughly 1,200 tornadoes strike the U.S. during an average year.They're prevalent in the U.S.far more so than anywhere else in the worldbecause its geography sets up the perfect conditions, especially in spring and summer.Westerly winds from the Pacific Ocean drop their moisture when they push up over the Rocky Mountains, becoming high, dry and cool as they move farther east.
Read at www.scientificamerican.com
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