| Fujita Tornado Intensity Scale | ||||
| F0 | Gale tornado (40-72 mph); light damages; some damage to chimneys; treee branches break off; push over shallow-rooted trees; damage to sign boards. | |||
| F1 | Moderate tornado (73-112 mph); moderate damages; peel surface off roofs; mobile homes pushed off foundations or overturned; moving automobiles pushed off roads. Lower limit is the beginning of hurricane force winds. | |||
| F2 | Significant tornado (113-157 mph); considerable damages; 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); severe damages; roofs and some walls torn off well-constructed houses; trains overturned; most trees in forest uprooted; heavy cars lifted off ground and thrown. | |||
| F4 | Devastating tornado (207-260 mph); devastating damages; well-constructed houses leveled; structures with weak foundations blown some distance; cars thrown and large missiles generated. | |||
| F5 | Incredible tornado (261-318 mph); incredible damage; strong frame houses lifted off foundations and carried considerable distances to disintegrate; automobile fly through the air in excess of 100 yards; trees debarked; incredible phenomena will occur. | |||
