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ENHANCED FUJITA SCALE

EF0 65–85 miles (105–137 km) per hour

EF1 86–110 miles (138–177 km) per hour

EF2 111–135 miles (178–217 km) per hour

EF3 136–165 miles (218–266 km) per hour

EF4 166–200 miles (267–322 km) per hour

EF5 greater than 200 miles (322 km) per hour

Laboratory (NSSL) studies tornadoes.
Storms Located in Norman, is
It

Severe tornadoes. Alley. Oklahoma, working
Tornado

National records of right in the heart is NSSL understand
to
the

The and how tornadoes form. It tracks

RATING TORNADOES FACT

On April 3, 1974, 147 tornadoes touched down in the U.S.

Seven of those were rated EF5. No other EF5 tornadoes formed that year.

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