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OCEMA Ogle County Emergency Management Agency email:
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Spotters Information Weather FAQ's Winter Weather Definitions Fujita Scale
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Fujita Scale
The Fujita Scale was developed by Dr.
(F0) Gale Tornado (40 - 72MPH)
Light Damage. Some damage to chimneys; breaks branches off trees, pushes over shallow-rooted trees, damages sign boards.
(F1) Moderate Tornado (73 - 112 MPH)
Moderate Damage. Lower limit is the beginning of hurricane-force winds. Peels surface off roofs; mobile homes pushed over; moving autos pushed off roads.
(F2) Significant Tornado (113 - 157 MPH)
Considerable damage. Roofs torn off frame houses; mobile homes demolished; boxcars pushed over, large trees snapped or uprooted; light-object missiles generated.
(F3) Severe Tornado (158 - 206 MPH)
Sever damage. Roofs and some walls torn off well-constructed homes; trains overturned; most trees in forest uprooted; heavy cars lifted off the ground and thrown.
(F4) Devastating Tornado (207 - 260 MPH)
Devastating damage. Well-constructed homes leveled; structures with weak foundations blown off some distance; cars thrown and large missiles generated.
(F5) Incredible Tornado (261 - 318 MPH)
Phenomenal damage. Strong frame homes disintegrate or lifted off foundations and carried considerable distance; tress debarked.