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The state straddles Tornado Alley and has had a number of especially strong twisters leave a path of death and destruction in their wake.

Tornado strength is currently measured on what is called the Enhanced Fujita Scale, which gives the tornado a rating from 0 to 5 based on estimated wind speeds and the severity of the damage.

Robert Siegel talks to Joe Wertz of the public radio initiative State Impact about the tornado that hit the Oklahoma City area on Monday.

Helicopter images of Moore, Oklahoma show tracts of devastated neighborhoods.