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Tornadoes are violently rotating columns of air that are in contact with both the surface of the Earth and the base of a cloud. A group of tornadoes in a short time period in the same region is known as a tornado outbreak .
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Tornadoes are violently rotating columns of air that are in contact with both the surface of the Earth and the base of a cloud. A group of tornadoes in a short time period in the same region is known as a tornado outbreak .
These are some notable tornadoes, tornado outbreaks, and tornado outbreak sequences that have occurred around the globe.
This article lists various tornado records. The most "extreme" tornado in recorded history was the Tri-State tornado, which spread through parts of Missouri, Illinois, and Indiana on March 18, 1925. It is considered an F5 on the Fujita Scale, holds records for longest path length at 219 miles (352 km) and longest duration at about 3+1⁄2 hours, and held the fastest forward speed for a significant tornado at 73 mph (117 km/h) anywhere on Earth until 2021. In addition, it is the deadliest single tornado in United States history with 695 fatalities. It was also the second costliest tornado in history at the time, and when costs are normalized for wealth and inflation, it still ranks third today.
The Enhanced Fujita scale rates tornado intensity based on the severity of the damage they cause. It is used in some countries, including the United States and France. The EF scale is also unofficially used in other countries, including China.
Thomas P. Grazulis is an American meteorologist who has written extensively about tornadoes and produced documentaries as head of The Tornado Project.
Tornado intensity is the measure of wind speeds and potential risk produced by a tornado. Intensity can be measured by in situ or remote sensing measurements, but since these are impractical for wide-scale use, intensity is usually inferred by proxies, such as damage. The Fujita scale, Enhanced Fujita scale, and the International Fujita scale rate tornadoes by the damage caused. In contrast to other major storms such as hurricanes and typhoons, such classifications are only assigned retroactively. Wind speed alone is not enough to determine the intensity of a tornado. An EF0 tornado may damage trees and peel some shingles off roofs, while an EF5 tornado can rip well-anchored homes off their foundations, leaving them bare— even deforming large skyscrapers. The similar TORRO scale ranges from a T0 for extremely weak tornadoes to T11 for the most powerful known tornadoes. Doppler radar data, photogrammetry, and ground swirl patterns may also be analyzed to determine the intensity and assign a rating.
A violent severe weather outbreak struck the Southeast on April 4–5, 1977. A total of 22 tornadoes touched down with the strongest ones occurring in Mississippi, Alabama, and Georgia. The strongest was a catastrophic F5 tornado that struck the northern Birmingham, Alabama, suburbs during the afternoon of Monday, April 4. In addition to this tornado, several other tornadoes were reported from the same system in the Midwest, Alabama, Georgia, Mississippi and North Carolina. One tornado in Floyd County, Georgia, killed one person, and another fatality was reported east of Birmingham in St. Clair County. In the end, the entire outbreak directly caused 24 deaths and 158 injuries. The storm system also caused the crash of Southern Airways Flight 242, which killed 72 and injured 22.
On March 21–22, 1952, a severe tornado outbreak generated eight violent tornadoes across the Southern United States, causing 209 fatalities—50 of which occurred in a single tornado in Arkansas. In addition, this tornado outbreak is the second deadliest on record to ever affect the state of Tennessee, with 66 of the fatalities associated with this outbreak occurring in the state; this is only surpassed by the 90 fatalities from a tornado outbreak in 1909, and in terms of fatalities is well ahead of both the 1974 Super Outbreak and the Super Tuesday tornado outbreak, each of which generated 45 and 31 fatalities, respectively. The severe weather event also resulted in the fourth-largest number of tornado fatalities within a 24-hour period since 1950. To date this was considered the most destructive tornado outbreak in Arkansas on record.
A deadly tornado outbreak devastated parts of Louisiana and Tennessee on February 11–13, 1950. The outbreak covered about a day and a half and produced numerous tornadoes, mostly from East Texas to the lower Mississippi Valley, with activity concentrated in Texas and Louisiana. Most of the deaths occurred in Louisiana and Tennessee, where tornadoes killed 25 and 9 people, respectively. Several long-lived tornado families struck the Red River region of northwestern Louisiana, especially the Shreveport–Bossier City area. One of the tornadoes attained violent intensity, F4, on the Fujita scale and caused eight deaths, including six at the Shreveport Holding and Reconsignment Depot near Barksdale Air Force Base. It remains one of the top ten deadliest tornadoes on record in the state of Louisiana, in tenth place. Also in Louisiana, two other destructive tornadoes on parallel paths killed 16. Seven additional deaths occurred across the border in East Texas. Nine people died in a tornado in western Tennessee as well. In all, the entire outbreak killed at least 41 people and left 228 injured. Also, several long-tracked tornadoes recorded in the outbreak likely contained more, shorter-lived tornadoes.
Five scattered tornadoes touched down across the Great Plains and Midwestern United States on June 19, 1951. The event was highlighted by a large, violent F4 tornado family that moved through the western and northern suburbs of Minneapolis, causing all the tornadic casualties from the outbreak. In all, one person was killed, 20 others were injured, and damage was estimated at $59 million. There was one additional death and six injuries from non-tornadic events as well.
Several destructive tornadoes struck the Southeastern United States, primarily along and east of the Lower Mississippi Valley, on February 13, 1952. Multiple intense tornadoes touched down throughout the day, three of which were killers. The deadliest and most destructive tornado of the outbreak was a violent F4 that touched down in south-central Tennessee, killing three people and injuring 44 others. A similarly destructive tornado—albeit of weaker, F2 intensity—formed from the same storm as the preceding F4 and became the second costliest of the outbreak. Another intense tornado affected the Mississippi embayment near Manila, Arkansas, injuring five people, and a pair of deadly F3s in Alabama claimed a combined two lives. In all, the outbreak killed five people and injured 102 others.
The history of tornado research spans back centuries, with the earliest documented tornado occurring in 200 and academic studies on them starting in the 18th century. This is a timeline of government or academic research into tornadoes.
During 2024, tornadoes and tornado outbreaks were extensively researched by meteorologists and engineers across the world. Some research and publications included: the effects of "Tornado Brain", the detection of tornadic infrasound, several mobile radar observations of tornadoes, including the measurement of tornadic winds over 300 mph (480 km/h), the idea of tornado alley shifting eastward, and many other things.