| Category 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.
| Category F3 | Severe tornado
(158-206 mph) | Severe damage.
Roofs and some walls torn off well-constructed houses; trains overturned; most trees in forest uprooted; heavy cars lifted off ground and thrown.
| Category F4 | Devastating tornado
(207-260 mph) | Devastating damage.
Well- constructed houses leveled; structure with weak foundation blown off some distance; cars thrown and large missiles generated.
| Category F5 | Incredible tornado
(261-318 mph) | Incredible damage.
Strong frame houses lifted off foundations and carried considerable distance to disintegrate; automobile sized missiles fly through the air in excess of 100 yards; trees debarked; incredible phenomena will occur.
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