The 1974 Super Outbreak was the second-largest tornado outbreak on record for a single 24-hour period, just behind the 2011 Super Outbreak. It was also the most violent tornado outbreak ever recorded, with 30 violent tornadoes confirmed. From April 3–4, 1974, there were 148 tornadoes confirmed in 13 U.S. states and the Canadian province of Ontario. In the United States, tornadoes struck Illinois, Indiana, Michigan, Ohio, Kentucky, Tennessee, Alabama, Mississippi, Georgia, North Carolina, Virginia, West Virginia, and New York. The outbreak caused roughly $843 million USD in damage, with more than $600 million occurring in the United States. The outbreak extensively damaged approximately 900 sq mi (2,331 km2) along a total combined path length of 2,600 mi (4,184 km). At one point, as many as 15 separate tornadoes were occurring simultaneously.
On April 10–12, 1965, a historic severe weather event affected the Midwestern and Southeastern United States. The tornado outbreak produced 55 confirmed tornadoes in one day and 16 hours. The worst part of the outbreak occurred during the afternoon hours of April 11 into the overnight hours going into April 12. The second-largest tornado outbreak on record at the time, this deadly series of tornadoes, which became known as the 1965 Palm Sunday tornado outbreak, inflicted a swath of destruction from Cedar County, Iowa, to Cuyahoga County, Ohio, and a swath 450 miles long (724 km) from Kent County, Michigan, to Montgomery County, Indiana. The main part of the outbreak lasted 16 hours and 35 minutes and is among the most intense outbreaks, in terms of tornado strength, ever recorded, including at least four "double/twin funnel" tornadoes. In all, the outbreak killed 266 people, injured 3,662 others, and caused $1.217 billion in damage. In 2023, tornado expert Thomas P. Grazulis created the outbreak intensity score (OIS) as a way to rank various tornado outbreaks. The 1965 Palm Sunday tornado outbreak received an OIS of 238, making it the third worst tornado outbreak in recorded history.
From April 26 to 27, 1991, multiple supercells across Oklahoma and Kansas led to a regional tornado outbreak. Forced by a potent trough and focused along a dryline, these distinct thunderstorms moved northeast through a moist and highly unstable environment. A total of 55 tornadoes were confirmed, many of which were strong, F2 or greater on the Fujita scale. A widely documented F5 tornado tore through Andover, Kansas, killing 17 people. Additional fatalities occurred from significant tornadoes in other portions of Kansas and Oklahoma, with 21 deaths recorded in total. An F4 tornado was detected by a mobile doppler weather radar team which observed winds up to 270 mph (430 km/h) at the top of the funnel, the first time winds of F5 intensity were measured by radar, and the highest winds recorded by radar at the time. A news team filming an F2 tornado sought shelter under a Kansas Turnpike overpass, causing a misconception that overpasses can provide adequate shelter during a tornado. This outbreak occurred within a transition period for the National Weather Service and proved the value of NEXRAD radars, which were utilized in Oklahoma to provide advanced warning to residents.
The 2002 Veterans Day weekend tornado outbreak was an unusually severe and expansive severe weather event across portions of the Central and Eastern United States from the evening hours of November 9 into the early morning hours of Veterans Day, November 11, 2002. A series of troughs tracked eastward across the United States, providing strong wind shear, while anomalously warm and unstable air surged northward into the Ohio River Valley. As a result, multiple tornadoes occurred across Arkansas, Tennessee, and Missouri on November 9. A far more widespread and severe event occurred the following day, with three distinct tornado outbreaks focused across areas from Illinois to Pennsylvania; Tennessee and Kentucky; and areas from Mississippi to South Carolina. The most intense tornado of the outbreak was a violent F4 tornado that occurred near Van Wert, Ohio. A total of 76 tornadoes occurred during the 3-day period, collectively resulting in 36 deaths and 303 injuries. As of 2022, the event ranks as the third-largest tornado outbreak on record in November.
The tornado outbreak of April 6–9, 1998 was a large tornado outbreak that started on April 6 across the Great Plains and ended on April 9 across the Carolinas and Georgia. A total of 62 tornadoes touched down from the Middle Atlantic States to the Midwestern United States and Texas. The outbreak is infamous for producing a deadly F5 that tore through the suburbs of Birmingham, Alabama, killing 32 people. The Birmingham tornado was one of only two F5 tornadoes that year. The other hit in Lawrence County, Tennessee, on April 16, as part of the same outbreak as the Nashville F3 tornado. This tornado outbreak was responsible for 41 deaths: 7 in Georgia and 34 in Alabama.
The tornado outbreak sequence of May 2004 was a series of tornado outbreaks that affected much of southern Ontario, the Central and Southern United States from east of the Rockies to the Mid-Atlantic States from May 21 to May 31, 2004. Particularly hard hit were the central Plains from Missouri to Iowa and the Ohio Valley. The Central Plains were hit by two significant outbreaks on May 22 and May 24, the first outbreak of which produced a very large and violent tornado in Hallam, Nebraska. The Ohio Valley was affected by one of the largest tornado outbreaks ever during the Memorial Day weekend on May 29–30.
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.
This page documents notable tornadoes and tornado outbreaks worldwide in 2004. Strong and destructive tornadoes form most frequently in the United States, Bangladesh, and Eastern India, but they can occur almost anywhere under the right conditions. Tornadoes also develop occasionally in southern Canada during the Northern Hemisphere's summer and somewhat regularly at other times of the year across Europe, Asia, and Australia. Tornadic events are often accompanied with other forms of severe weather, including strong thunderstorms, strong winds, and hail.
This page documents notable tornadoes and tornado outbreaks worldwide in 2001. Strong and destructive tornadoes form most frequently in the United States, Bangladesh, and Eastern India, but they can occur almost anywhere under the right conditions. Tornadoes also develop occasionally in southern Canada during the Northern Hemisphere's summer and somewhat regularly at other times of the year across Europe, Asia, and Australia. Tornadic events are often accompanied with other forms of severe weather, including strong thunderstorms, strong winds, and hail.
A tornado emergency is an enhanced version of a tornado warning, which is used by the National Weather Service (NWS) in the United States during imminent, significant tornado occurrences in highly populated areas. Although it is not a new warning type from the NWS, issued instead within a severe weather statement or in the initial tornado warning, a tornado emergency generally means that significant, widespread damage is expected to occur and a high likelihood of numerous fatalities is expected with a large, strong to violent tornado.
The Marion, Illinois tornado outbreak was a small, severe tornado outbreak that affected southern portions of the Midwestern United States on May 29, 1982.
The 1999 Bridge Creek–Moore tornado was a large, long-lived and exceptionally powerful F5 tornado in which the highest wind speeds ever measured globally was recorded at 321 miles per hour (517 km/h) by a Doppler on Wheels (DOW) radar. Considered the strongest tornado ever recorded to have affected the metropolitan area, the tornado devastated southern portions of Oklahoma City, Oklahoma, United States while near peak intensity, along with surrounding suburbs and towns to the south and southwest of the city during the early evening of Monday, May 3, 1999. Parts of Bridge Creek were rendered unrecognizable. The tornado covered 38 miles (61 km) during its 85-minute existence, destroying thousands of homes, killing 36 people, and leaving US$1 billion in damage, ranking it as the fifth-costliest on record not accounting for inflation. Its severity prompted the first-ever use of the tornado emergency statement by the National Weather Service.
The 2011 Super Outbreak was the largest, costliest, and one of the deadliest tornado outbreaks ever recorded, taking place in the Southern, Midwestern, and Northeastern United States from April 25 to 28, 2011, leaving catastrophic destruction in its wake. Over 175 tornadoes struck Alabama, Mississippi, and Tennessee, which were the most severely damaged states. Other destructive tornadoes occurred in Arkansas, Georgia, Kentucky, Louisiana, New York, and Virginia, with storms also affecting other states in the Southern and Eastern United States. In total, 360 tornadoes were confirmed by NOAA's National Weather Service (NWS) and Government of Canada's Environment Canada in 21 states from Texas to New York to southern Canada. Widespread and destructive tornadoes occurred on each day of the outbreak. April 27 was the most active day, with a record 216 tornadoes touching down that day from midnight to midnight CDT. Four of the tornadoes were rated EF5, which is the highest ranking on the Enhanced Fujita scale; typically these tornadoes are recorded no more than once a year.
During the afternoon of May 22, 2004, a long-track F4 tornado formed during a tornado outbreak and tore through multiple counties in southeast Nebraska. The tornado damaged many towns along its path, but its most significant destructive effect occurred at the town of Hallam. The Hallam tornado is recognized by NOAA as the second-largest tornado on record, peaking at 2.5 miles (4.0 km) wide at Hallam, behind only the 2013 El Reno tornado.
This page documents notable tornadoes and tornado outbreaks worldwide in 2020. Strong and destructive tornadoes form most frequently in the United States, Argentina, Brazil, Bangladesh, and eastern India, but can occur almost anywhere under the right conditions. Tornadoes also develop occasionally in southern Canada during the Northern Hemisphere's summer and somewhat regularly at other times of the year across Europe, Asia, Argentina, Australia and New Zealand. Tornadic events are often accompanied by other forms of severe weather, including strong thunderstorms, strong winds, and hail. There were 1,243 preliminary filtered reported tornadoes in 2020 in the United States in 2020, and 1,086 confirmed tornadoes in the United States in 2020. Worldwide, at least 93 tornado-related deaths were confirmed with 78 in the United States, eight in Vietnam, two each in Canada, Indonesia, and Mexico, and one in South Africa.
Between April 23–30, 1961, a tornado outbreak sequence struck the Midwest, Ohio, and Mississippi Valleys, and the Eastern United States. Large hailstorms accompanied the tornadoes as well and numerous other weather events also occurred. Three people were killed, 38 others were injured and losses totaled $26.810 million. Two additional fatalities also occurred due to flooding and lightning.
On the afternoon of July 8, 2020, a violent and deadly drillbit tornado struck the area between the towns of Ashby and Dalton, Minnesota. The National Weather Service in Grand Forks, North Dakota rated the worst of the damage from the tornado EF4 on the Enhanced Fujita scale. The tornado was also used as the cover for the 2021 disaster film 13 Minutes.
On November 10, 2002, a violent tornado struck the city of Van Wert and the community of Roselms, both in Ohio. The National Weather Service rated the worst of the damage F4 on the Fujita scale, near and in the Van Wert area. In Van Wert, hundreds of homes and businesses were damaged or destroyed, with several homes and businesses sustaining F4 damage. One of those buildings, the Twin Cinemas movie theater, was leveled by the tornado, but the sixty people located inside the theater survived. The tornado also devastated Roselms, where only a single structure remained standing. Overall, the tornado killed four people, injured seventeen others, and caused over $30 million in damages.
