Fujita Pearson Tornado Scale

F-0
40-72 mph, chimney damage, tree branches broken

F-1
73-112 mph, mobile homes pushed off foundation or overturned

F-2
113-157 mph, considerable damage, mobile homes demolished, trees uprooted

F-3
158-205 mph, roofs and walls torn down, trains overturned, cars thrown

F-4
207-260 mph, well-constructed walls leveled

F-5
261-318 mph, homes lifted off foundation and carried considerable distances, autos thrown as far as 100 meters