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50 Amazing Tornado Facts

Seven deadly years

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Tornado damage in Mattoon, Ill., from a tornado outbreak in 1917. (Image credit: NOAA.)

Since 1875, only six other years have seen more than 500 tornado-related deaths, according to data from the NSSL. (They are 1896, 1917, 1925, 1927, 1936 and 2011.)

Modern outbreak

tuscaloosa tornado track satellite image

The track of devestation from the Birmingham tornado, one of the 753 tornadoes that struck during April 2011. (Image credit: NASA.)

The biggest tornado outbreak for the modern era was the April 27-28, 2011, outbreak across the Southeast, according to the definitions used by the Storm Prediction Center. That outbreak saw 59 EF0s, 65 EF1s, 20 EF2s, 16 EF3s, 11 EF4s and four EF5s, for a total of 175 tornadoes in a single 24-hour period. It killed more than 300 people and caused billions of dollars in damage. The 2011 outbreak took the place of the previous record holder, the so-called Super Outbreak of April 3-4, 1974, which produced 147 known tornadoes.

Infamous record

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A map of the tornadoes and their tracks that struck during the 1974 "Super Outbreak" of tornadoes. (Image credit: NOAA.)

The 1974 "Super Outbreak" still retains the record for the most F5s (as the Fujita scale was still in use then) in a single day: seven.

Widest tornado

Path of the El Reno, Okla., tornado

The path of the tornado that hit near El Reno, Okla., a suburb of Oklahoma City, on May 31, 2013. The tornado was judged by researchers to have been an EF5 at its peak and to have reached 2.6 miles (4 kilometers) wide at its peak (marked on the map). (Image credit: NWS/NOAA)

The widest tornado on record was an EF5 that struck near El Reno, Okla., on May 31, 2013. At its peak, the tornado had a width of 2.6 miles (4 kilometers), according to the National Weather Service's Norman, Okla., office. This tornado replaced the previous record-holder, an F4 that struck Hallam, Neb., on May 22, 2004, and that was 2.5 miles wide.

What's the strongest?

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Damage caused by the F5 tornado that struck Moore, Okla., on May 3, 1999, one of the stronger tornadoes on record. (Image credit: NWS)

No one knows what the strongest tornado on record is, according to the SPC, because ground-level wind speeds have never been measured in the strongest tornadoes.

Looks can be deceiving

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A tornado near Wichita Falls, Texas, on April 10, 1979. (Image credit: NOAA Photo Library, NOAA Central Library; OAR/ERL/National Severe Storms Laboratory (NSSL))

With tornadoes, size is not necessarily an indication of strength.

Unlucky city

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Tornadoes rough up Oklahoma City, a lot. (Image credit: NOAA.)

Oklahoma City is the city that has been hit by the most tornadoes based on existing records, according to the Storm Prediction Center. Factoring in changes to the city limits over time and changes to tornado reporting, the city has been hit by more than 100 tornadoes.

High-risk area

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An approximate map of the area known colloquially as "Tornado Alley" based on data on the states that see the most tornadoes. (Image credit: FEMA/NOAA)

Tornado Alley is not a technically defined area, but is the nickname for the region in the central part of the United States that typically sees the most tornado activity. Tornadoes do happen outside this region.

Way up there

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While on a backpacking trip into the eastern portion of Sequoia National Park, Scott Newton encountered a tornadic thunderstorm. It is the highest tornado ever recorded. (Image credit: All Rights Reserved, Scott Newton, 2004)

The highest twister ever recorded was photographed by a hiker at 12,000 feet (3,658 meters) in California's Sequoia National Park on July 7, 2004.

Dangerous heights

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A damage map of the Teton-Yellowstone Tornado, an F-4 tornado that hit Wyoming on July 21, 1987. (Image credit: T. Theodore Fujita/Monthly Weather Review Vol. 117 Sept. 1989)

On July 21, 1987, there was an EF-4 tornado in Wyoming between 8,500 and 10,000 feet in elevation, the highest altitude ever recorded for a violent tornado, according to the National Weather Service.