ROCHESTER, Minn. (KTTC) – After Monday’s severe weather threat, a confirmed EF-1 tornado damaged property outside Kenyon ...

(KNWA/KFTA) — April 10, 1929, was the day the only documented F5 tornado occurred in ... was used to classify tornadoes based on wind speeds. Through several years of rating tornadoes, it ...

Dave Sills, director of the Northern Tornadoes Project at Western University in London, Ont., said it was an early-season ...

Modern standards qualify the so-called Tri-State Tornado as an F5, a mile-wide funnel with wind speeds greater than 260 mph (418 kph). Perhaps the best evidence of its destructive handiwork was ...

which rated tornadoes from F0 to F5, based on estimated wind speeds and observed damage. Then, in 2007, the weather service adopted the Enhanced Fujita scale, which better reflected actual storm ...