2011 tornado death toll tops 500 and season not over
This year's tornado death toll ranks as the highest ever through the month of May in NOAA and the National Weather Service's official record.

DEADLY TWISTERS: There have been approximately 1,000 tornadoes in the U.S. so far this year. Fifteen are confirmed EF-4 and EF-5 tornadoes on the Enhanced Fujita scale and that number is expected to climb. (Photo: ZUMA Press)





















