The Enhanced Fujita Scale is used to assign tornadoes a rating based on estimated wind speeds and damage.
The EF Scale became operational on Feb. 1, 2007. It was revised from the original Fujita Scale, developed in 1971 by Tetsuya Fujita, to better reflect wind speed with damage observed in tornado surveys.
Deadly Severe Weather Facts & Safety Tips:
The Bay area will see pleasant conditions hold into the new week with plenty of sunshine and comfortable temperatures.
A pattern favoring waves of progressively cooler air will set up across much of the Midwest and Northeast during next week and could continue into early May.
Rounds of flooding and severe storms slammed the South and Plains this week, while a storm system unleashed dust storms and snow in the West.
Thunderstorms, some locally severe, will erupt from central Texas, northward into part of Nebraska into Friday night. The worst of the storms are likely to occur in Texas.
Ahead of the monsoon season in India, temperatures will swell well above normal in parts of India and Pakistan.
The 119th Boston Marathon will take place on Monday, April 20, and runners set to take on the historic course will face cool and potentially rainy conditions.
West Palm Beach, FL (1942)
Deluge of 8.35" of rain in 2 hours.
Ft. Wayne, IN (1963)
Precipitation totaled 2.65": hail 1.75" in diameter, 2 tornadoes, $650,000 damage, 21 buildings destroyed.
Burlington, VT (1983)
15.6" snowstorm - April record.