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Determining Tornado Strength

Scale Wind speed Relative frequency Potential damage
mph km/h
EF0 65–85 105–137 53.5% Light damage.

Peels surface off some roofs; some damage to gutters or siding; branches broken off trees; shallow-rooted trees pushed over.

Confirmed tornadoes with no reported damage (i.e. those that remain in open fields) are always rated EF0.

EF0 damage example
EF1 86–110 138–178 31.6% Moderate damage.

Roofs severely stripped; mobile homes overturned or badly damaged; loss of exterior doors; windows and other glass broken.

EF1 damage example
EF2 111–135 179–218 10.7% Considerable damage.

Roofs torn off well-constructed houses; foundations of frame homes shifted; mobile homes completely destroyed; large trees snapped or uprooted; light-object missiles generated; cars lifted off ground.

EF2 damage example
EF3 136–165 219–266 3.4% Severe damage.

Entire stories of well-constructed houses destroyed; severe damage to large buildings such as shopping malls; trains overturned; trees debarked; heavy cars lifted off the ground and thrown; structures with weak foundations blown away some distance.

EF3 damage example
EF4 166–200 267–322 0.7% Devastating damage.

Well-constructed houses and whole frame houses completely leveled; cars thrown and small missiles generated.

EF4 damage example
EF5 >200 >322 <0.1% Exploding damage.

Strong frame houses leveled off foundations and swept away; automobile-sized missiles fly through the air in excess of 100 m (300 ft); steel reinforced concrete structure badly damaged; high-rise buildings have significant structural deformation; incredible phenomena will occur.

So far there have been two EF5 tornadoes recorded since the Enhanced Fujita Scale was introduced on February 1, 2007. The most recent one occurred in Parkersburg, Iowa on May 25, 2008 and leveled half the city. See Greensburg, Kansas tornado, Northeast Iowa supercell

EF5 damage example

Watch an EF5 tornado crash into a bank!!!

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