Infographic: When A Tornado Destroys Everything

May 19, 2013; 1:18 AM ET
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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:

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This Day In Weather History

Arkansas to South Carolina (1948)
Ice storm (Jan. 24th-31st) causes considerable damage; at least 30 deaths and $20 million damage.

Canada (1985)
Huge blizzard in northeastern Canada; lowest pressure ever recorded in Canada was approached with 946 mb at Mary's Harbor, Newfoundland (Record of 940.2 mb set at St. Anthony's, Newfoundland, Jan. 20, 1977.) Cartwright, Newfoundland had close to 24 inches of snow (total 106 inches on ground).

Cape Canaveral, FL (1986)
The Space Shuttle Challenger exploded after liftoff. Cold weather on the morning of the liftoff was blamed for causing o-rings to fail which caused the explosion.