Fujita Scale - DAN'S WILD WILD WEATHER PAGE

Fujita Tornado Intensity Scale
F0 - F1	F2 - F3	F4 - F5
Weak Tornado	Strong Tornado	Violent Tornado

`F0`	`40-72 mph`	`Gale tornado Light damage. Some damage to chimneys; break branches off trees; push over shallow-rooted trees; damage sign boards.`
`F1`	`73-112 mph`	`Moderate tornado Moderate damage. The lower limit is the beginning of hurricane wind speed; peel surface off roofs; mobile homes pushed off foundations or overturned; moving autos pushed off the roads.`
`F2`	`113-157 mph`	`Significant tornado Considerable damage. Roofs torn off frame houses; mobile homes demolished; pushed over; large trees snapped or uprooted; light-object missiles generated.`
`F3`	`158-206 mph`	`Severe tornado. Severe damage. Roofs and some walls torn off well-constructed houses; trains overturned; most trees in forest uprooted; heavy cars lifted off the ground and thrown.`
`F4`	`207-260 mph`	`Devastating tornado Devastating damage. Well-constructed houses leveled; structures with weak foundations blown off some distance; cars thrown and large missiles generated.`
`F5`	`261-318 mph`	`Incredible tornado. Incredible damage. Strong frame houses lifted off foundations and carried considerable distance to disintegrate; automobile sized missiles fly through the air in excess of 100 meters(109 yards); trees debarked; incredible phenomena will occur.`
`F6 to F12`	`319 mph - MACH 1 ( the speed of sound)`	`The maximum wind speeds of tornadoes are not expected to reach the F6 wind speeds.`

Enhanced Fujita Scale

FUJITA SCALE			DERIVED EF SCALE		OPERATIONAL EF SCALE
F Number	Fastest 1/4-mile (mph)	3 Second Gust (mph)	EF Number	3 Second Gust (mph)	EF Number	3 Second Gust (mph)
0	40-72	45-78	0	65-85	0	65-85
1	73-112	79-117	1	86-109	1	86-110
2	113-157	118-161	2	110-137	2	111-135
3	158-207	162-209	3	138-167	3	136-165
4	208-260	210-261	4	168-199	4	166-200
5	261-318	262-317	5	200-234	5	Over 200

*** IMPORTANT NOTE ABOUT ENHANCED F-SCALE WINDS: The Enhanced F-scale still is a set of wind estimates (not measurements) based on damage. Its uses three-second gusts estimated at the point of damage based on a judgment of 8 levels of damage to the 28 indicators listed below. These estimates vary with height and exposure. Important: The 3 second gust is not the same wind as in standard surface observations. Standard measurements are taken by weather stations in open exposures, using a directly measured, "one minute mile" speed.