The different categories of tornadoes

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

F-1 73-112 mph, Moderate damage, mobile homes pushed off foundation or flipped over

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

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

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

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

Tornadoes are classified into five categories, F-0 through F-5. F-0 tornadoes are the mildest. F-5 tornadoes are the most dangerous and the rarest.