F0: 40-72 mph winds.
Some damage to chimneys; breaks branches off trees.

F1: 73-112 mph winds. Peels surface off roofs; mobile homes pushed off foundations or overturned; moving autos pushed off roads.

F2: 113-157 mph. Roofs torn off frame houses; mobile homes demolished; boxcars pushed over; large trees snapped or uprooted.

F3: 158-206 mph. Roofs and some walls torn off well- constructed houses; trains overturned; most trees uprooted.

F4: 207-260 mph. Well-constructed houses leveled; structures with weak foundations blown off some distance; cars thrown

F5: 261-318 mph. Strong-frame houses lifted off and disintegrated; automobile-sized missiles thrown in excess of 100 meters; trees debarked.