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, even though tornadoes were not ranked on any scale at the time. It holds records for longest path length at 219 miles (352 km), longest duration at about 3½ hours, and fastest forward speed for a significant tornado at 73 mph (117 km/h) anywhere on Earth. In addition, it is the deadliest single tornado in United States history with 695 fatalities. It was also the third-costliest tornado in history at the time, but has been surpassed by several others non-normalized. When costs are normalized for wealth and inflation, it still ranks third today.
The deadliest tornado in world history was the Daulatpur-Saturia tornado in Bangladesh on April 26, 1989, which killed approximately 1,300 people. In its history, Bangladesh has had at least 19 tornadoes kill more than 100 people, almost half of the total for the rest of the world.
For 37 years, the most extensive tornado outbreak on record, in almost every category, was the 1974 Super Outbreak, which affected a large area of the central United States and extreme southern Ontario in Canada on April 3 and April 4, 1974. Not only did this outbreak feature 148 tornadoes in only 18 hours, but an unprecedented number of them were violent; 7 were of F5 intensity and 23 were F4. During the peak of this outbreak there were 16 tornadoes on the ground at the same time. More than 300 people, possibly as many as 330, were killed by tornadoes during this outbreak. However, this record was later broken during the 2011 Super Outbreak, which resulted in 360 tornadoes and 324 tornadic fatalities.
|Duration in hours||Outbreak||Year||Country||24 hour Tornadoes||Total Tornadoes||F2+||F4+||Deaths||Cost in millions|
|18||1974 Super Outbreak||1974||US||148||148||96||30||315||4500|
|5.43333||1981 United Kingdom tornado outbreak||1981||UK||104||104||2||0||8||?|
|79.3||2011 Super Outbreak||2011||US||216||360||86||15||324||12200|
The 2011 Super Outbreak was the most prolific tornado outbreak in history. It produced 360 tornadoes, with 216 of those in a single 24-hour period on April 27, including 11 EF4 and 4 EF5 tornadoes. 348 deaths occurred in that outbreak, of which 324 were tornado related. The outbreak helped smash the record for most tornadoes in the month of April with 770 tornadoes, almost triple the prior record (267 in April 1974). The overall record for a single month was 542 in May 2003, which was also broken.
The infamous 1974 Super Outbreak of April 3-4, 1974, which spawned 148 confirmed tornadoes across eastern North America, held the record for the most prolific tornado outbreak for many years. Not only did it produce an exceptional number of tornadoes, but it was also an inordinately intense outbreak producing dozens of large, long-track tornadoes, including 7 F5 and 23 F4 tornadoes. More significant tornadoes occurred within 24 hours than any other week in the tornado record. Due to a secular trend in tornado reporting, the 2011 and 1974 tornado counts are not directly comparable.
Most tornado outbreaks in North America occur in the spring, but there is a secondary peak of tornado activity in the fall which is less consistent but can include exceptionally large and/or intense outbreaks. In 1992, an estimated 95 tornadoes broke out in a record 41 hours of continuous tornado activity from November 21 to 23. This is also among the largest-known outbreaks in areal expanse. Many other very large outbreaks have occurred in autumn, especially in October and November.
The greatest number of tornadoes spawned from a hurricane is 118 from Hurricane Ivan in 2004. Caution is advised comparing the raw number of counted tornadoes from recent decades to decades prior to the 1990s since more tornadoes that occur are now recorded than in the past.
The Tri-State Tornado of March 18, 1925 killed 695 people in Missouri (11), Illinois (613), and Indiana (71). The outbreak it occurred with was also the deadliest known tornado outbreak, with a combined death toll of 747 across the Mississippi River Valley.
Similar to fatalities, damage (and observations) of a tornado are a coincidence of what character of tornado interacts with certain characteristics of built up areas. That is, destructive tornadoes are in a sense "accidents" of a large tornado striking a large population. In addition to population and changes thereof, comparing damage historically is subject to changes in wealth and inflation. The 1896 St. Louis-East St. Louis tornado on May 27, incurred the most damages adjusted for wealth and inflation, at an estimated $2.9 billion (1997 USD). In raw numbers, the Joplin tornado of May 22, 2011 is considered the costliest tornado in recent history, with damage totals near $2.8 billion (2011 USD). Until 2011, the "Bridge Creek-Moore tornado" of May 3, 1999 was the most damaging.
|Day||Year||Country||Location||Min Wind Speed||Wind Speed||Max Wind Speed||References|
|April 26||1991||US||Red Rock, Oklahoma||262 mph (422 km/h)||268 mph (431 km/h)||280 mph (450 km/h)|||
|May 30||1998||US||Spencer, South Dakota||237 mph (381 km/h)||264 mph (425 km/h)||268 mph (431 km/h)|||
|May 3||1999||US||Bridge Creek, Oklahoma||280 mph (450 km/h)||302 mph (486 km/h)||324 mph (521 km/h)|||
|May 3||1999||US||Mulhall, Oklahoma||245 mph (394 km/h)||257 mph (414 km/h)||299 mph (481 km/h)|||
|May 24||2011||US||El Reno, Oklahoma||289 mph (465 km/h)||295 mph (475 km/h)||296 mph (476 km/h)|||
|May 31||2013||US||El Reno, Oklahoma||291 mph (468 km/h)||302 mph (486 km/h)||336 mph (541 km/h)|||
During the F5 1999 Bridge Creek-Moore tornado on May 3, 1999 in the southern Oklahoma City metro area, a Doppler on Wheels situated near the tornado measured winds of 302 ± 22 mph (486 ± 35 km/h) momentarily in a small area inside the funnel approximately 100 m (330 ft) above ground level. These are also the highest wind speeds observed on Earth.
On May 31, 2013, a tornado hit rural areas near El Reno, Oklahoma. The tornado was originally rated as an EF3 based on damage; however, after mobile radar data analysis was conducted, it was concluded to have been an EF5 due to a measured wind speed of greater than 296 mph (476 km/h), second only to the Bridge Creek - Moore tornado. Revised RaXPol analysis found winds of 302 mph (486 km/h) well above ground level and >=291 mph (468 km/h) below 10 m (33 ft) with some subvortices moving at 175 mph (282 km/h). These winds may possibly be as high or higher than the winds recorded on May 3, 1999. Despite the recorded windspeed, the El Reno tornado was later downgraded back to EF3 due to the fact that no EF5 damage was found, likely due to the lack of sufficient damage indicators in the largely rural area west of Oklahoma City.
Winds were measured at 262-280 mph (422-451 km/h) using portable Doppler radar in the Red Rock, Oklahoma tornado during the April 26, 1991 tornado outbreak in north-central Oklahoma. Though these winds are possibly indicative of an F5 strength tornado, this particular tornado's path never encountered any significant structures and caused minimal damage. Thus it was rated an F4.
The longest-known track for a single tornado is the Tri-State Tornado with a path length of 151 to 235 mi (243 to 378 km). For years there was debate whether the originally recognized path length of 219 mi (352 km) over 3.5 hours was from one tornado or a series. Some very long track (VLT) tornadoes were later determined to be successive tornadoes spawned by the same supercell thunderstorm, which are known as a tornado family. The Tri-State Tornado, however, appeared to have no gaps in the damage. A six-year reanalysis study by a team of severe convective storm meteorologists found insufficient evidence to make firm conclusions but does conclude that it is likely that the beginning and ending of the path was resultant of separate tornadoes comprising a tornado family. It also found that the tornado began 15 mi (24 km) to the west and ended 1 mi (1.6 km) farther east than previously known, bringing the total path to 235 mi (378 km). The 174 mi (280 km) segment from central Madison County, Missouri to Pike County, Indiana is likely one continuous tornado and the 151 mi (243 km) segment from central Bollinger County, Missouri to western Pike County, Indiana is very likely a single continuous tornado. Another significant tornado was found about 65 mi (105 km) east-northeast of the end of aforementioned segment(s) of the Tri-State Tornado Family and is likely another member of the family. Its path length of 20 mi (32 km) over about 20 minutes makes the known tornado family path length total to 320 mi (510 km) over about 5½ hours.Grazulis in 2001 wrote that the first 60 mi (97 km) of the (originally recognized) track is probably the result of two or more tornadoes and that a path length of 157 mi (253 km) was seemingly continuous.
What at one time was thought to be the record holder for the longest tornado path is now thought to be the longest tornado family, with a track of at least 293 miles (472 km) on May 26, 1917 from the Missouri border across Illinois into Indiana. It caused severe damage and mass casualties in Charleston and Mattoon, Illinois.
What was probably the longest track supercell thunderstorm tracked 790 miles (1,270 km) across 6 states in 17.5 hours on March 12, 2006 as part of the March 2006 tornado outbreak sequence. It began in Noble County, Oklahoma and ended in Jackson County, Michigan, producing many tornadoes in Missouri and Illinois.
Officially, the widest tornado on record is the El Reno, Oklahoma tornado of May 31, 2013 with a width of 2.6 miles (4.2 km) at its peak. This is the width found by the National Weather Service based on preliminary data from University of Oklahoma RaXPol mobile radar that also sampled winds of 296 mph (476 km/h) which was used to upgrade the tornado to EF5. However, it was revealed that these winds did not impact any structures, and as a result the tornado was downgraded to EF3 based on damage.
The F4 Hallam, Nebraska tornado during the outbreak of May 22, 2004 was the previous official record holder for the widest tornado, surveyed at 2.5 miles (4.0 km) wide. A similar size tornado struck Edmonson, Texas on May 31, 1968, when a damage path width between 2 to 3 miles (3.2 to 4.8 km) was recorded from an F3 tornado.
The highest forward speed of a tornado on record was 73 miles per hour (117 km/h) from the 1925 Tri-State Tornado. Other weak tornadoes have approached or exceeded this speed, but this is the fastest forward movement observed in a major tornado.
A pressure deficit of 100 millibars (2.95 inHg) was observed when a violent tornado near Manchester, South Dakota on June 24, 2003 passed directly over an in-situ probe that storm chasing researcher Tim Samaras deployed. In less than a minute, the pressure dropped to 850 millibars (25.10 inHg), which are the greatest pressure decline and the lowest pressure ever recorded at the Earth's surface when adjusted to sea level.
On April 21, 2007, a 194-millibar (5.73 inHg) pressure deficit was reported when a tornado struck a storm chasing vehicle in Tulia, Texas. The tornado caused EF2 damage as it passed through Tulia. The reported pressure drop far exceeds that which would be expected based on theoretical calculations.
A few scientists in Europe, the US, and elsewhere documented the occurrence of tornadoes in the late 18th and early-mid 19th centuries to try to discern patterns of distribution and sometimes with inferences about formative processes and dynamics.
For intensive studies of tornadoes, these are the earliest known publications:
|Length in Years||Start of Tornado drought||End of Tornado drought|
|3.915068||May 5, 1960||Apr 3 1964|
|4.99726||Apr 4 1977||Apr 2 1982|
|4.786301||May 31, 1985||Mar 13 1990|
|4.090411||Jun 16 1992||Jul 18 1996|
|8.008219||May 3, 1999||May 4, 2007|
|6+||May 20, 2013||Present|
Before the Greensburg EF5 tornado on May 4, 2007, it had been 8 years and one day since the US had a confirmed F5 or EF5 tornado. The last confirmed F5 or EF5 had hit southern Oklahoma City metro area and surrounding communities during the May 3, 1999 event. This is the longest interval without an F5 or EF5 tornado since official records began in 1950.
2018 is the first year since official records began in 1950 that no tornado in the US was rated violent class (EF4/EF5, or, previously, F4/F5).
Matt Suter of Fordland, Missouri holds the record for the longest-known distance traveled by anyone picked up by a tornado and survive. On March 12, 2006 he was carried 1,307 feet (398 m), 13 feet (4.0 m) shy of one-quarter mile (400 m), according to National Weather Service measurements.
The small town of Codell, Kansas, was hit by a tornado on the same date (May 20) three consecutive years: 1916, 1917, and 1918. The United States has about 100,000 thunderstorms per year; less than 1% produce a tornado. The odds of this coincidence occurring again are extremely small.
Tanner, a small town in northern Alabama, was hit by an F5 tornado on April 3, 1974 and was struck again 45 minutes later by a second F5 (however, the rating is disputed and it may have been high-end F4), demolishing what remained of the town. Thirty-seven years later, on April 27, 2011 (the largest and deadliest outbreak since 1974), Tanner was hit yet again by the EF5 2011 Hackleburg-Phil Campbell tornado, which produced high-end EF4 damage in the southern portion of town. The suburban community of Harvest, Alabama, just to the northeast, also sustained major impacts from all three Tanner tornadoes, and was also hit by destructive tornadoes in 1995 and 2012.
The south Oklahoma City suburb of Moore, Oklahoma was hit by violent tornadoes (which have ratings of at least F/EF4) in 1999, 2003, 2010, and 2013. The 1999 and 2013 events were rated F5 and EF5, respectively. In total, about 23 tornadoes have struck within the immediate vicinity of Moore since 1890, the most recent of which was an EF2 on March 25, 2015.
The city of Jackson, Tennessee has been hit by an F4/EF4 tornado three separate times, in 1999, 2003, and 2008. All three of these tornadoes occurred after dark and were preceded or followed by a separate F3/EF3 tornado that caused additional destruction in the Jackson area.