Font of Knowledge

Tornado wind speeds are ranked using the Enhanced Fujita (EF) Scale.  The speeds are as follows:

• EF0 65–85 mph      (53.5% of all tornados)
• EF1 86–110 mph    (31.6% of all tornados)
• EF2 111–135 mph  (10.7% of all tornados)
• EF3 136–165 mph  (3.4% of all tornados)
• EF4 166–200 mph  (0.7% of all tornados)
• EF5 >200 mph       (Less than 0.1% of all tornados)

The most recently recorded EF5 tornado occurred in Parkersburg, Iowa on May 25, 2008 and destroyed half of the town.