 | National Weather Service Forecast Office |  |
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Appendix
Fujita Scale (or F Scale) of tornado damage intensity. The F Scale was developed based on damage intensity and not wind speed; wind speed ranges given are estimated, based on the extent of observed damage.
| F Scale |
Character |
Estimated winds |
Description |
| Zero (F0) |
Weak |
40-72 mph |
Light Damage. Some damage to chimneys; branches broken off trees, shallow-rooted trees uprooted, sign boards damaged. |
| One (F1) |
Weak |
73-112 mph |
Moderate damage. Roof surfaces peeled off; mobile homes pushed foundations or overturned; moving autos pushed off road. |
| Two (F2) |
Strong |
113-157 mph |
Considerable damage. Roofs torn from frame houses; mobile homes demolished; boxcars pushed over; large trees snapped or uprooted; light objects become projectiles. |
| Three (F3) |
Strong |
158-206 mph |
Severe damage. Roofs and some walls torn from well- constructed houses; trains overturned; most trees in forested area uprooted; heavy cars lifted and thrown. |
| Four (F4) |
Violent |
207-260 mph |
Devastating damage. Well- constructed houses leveled; structures with weak foundation blown some distance; cars thrown; large missiles generated. |
| Five (F5) |
Violent |
260-318 mph |
Incredible damage. Strong frame houses lifted off foundations, carried considerable distances, and disintegrated; auto-sized missiles airborne for several hundred feet or more; trees debarked. |
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NWS Forecast Office
National Weather Center
120 David L. Boren Blvd.
Suite 2400
Norman, OK 73072
Tel: (405) 325-3816
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Page last modified: June 5, 2008
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