Categories of tornadoes

F-0 is 40-72 mph, Light damage, chimney damage, tree branches broken.
F-1 is 73-112 mph, Moderate damage, mobile homes pushed off foundation or flipped over.
F-2 is 113-157 mph, Considerable damage, mobile homes demolished, trees uprooted.
F-3 is 158-205 mph, Severe damage, roofs and walls torn down, trains overturned, cars thrown around.
F-4 is 207-260 mph, Devastating damage, well-constructed walls leveled.
F-5 is 261-318 mph, Violent damage, homes lifted off foundation and carried considerable distances, autos thrown as far as 100 meters.