The Fujita Scale is used to measure the strength of a Tornado.
Class
Speed (mph)
Damage
F-0
40-72
Tree & chimney damage.
F-1
73-112
Mobile homes pushed off foundations.
F-2
113-157
Trees uprooted, mobile homes demolished.
F-3
158-205
Cars picked up, trains overturned, roofs & walls torn down.
F-4
207-260
Well constructed walls leveled.
F-5
261-318
Homes lifted off foundations, autos thrown as far as 100 meters.