The Tornadoes Portal

A tornado near Anadarko, Oklahoma, in 1999
Tornadoes are violently rotating columns of air that are in contact with the Earth and either a cumulonimbus or a cumulus cloud. Tornadoes are often referred to as twisters, whirlwinds, or cyclones. While most tornadoes attain winds of less than 110 miles per hour (180 km/h), are about 250 feet (80 m) across, and travel a few miles (several kilometers), the wind speeds in the most intense tornadoes can reach 300 miles per hour (480 km/h), are more than two miles (3 km) in diameter, and stay on the ground for dozens of miles (more than 100 km). Various types of tornadoes include the multiple vortex tornado, landspout, and waterspout. Other tornado-like phenomena that exist in nature include the gustnado, dust devil, fire whirl, and steam devil. Most tornadoes occur in North America (in the United States and Canada), concentrated in a region nicknamed the Tornado Alley. Tornadoes also occur in South America, South Africa, Europe, Asia, and Oceania.

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Supercell thunderstorm hitting Toronto and the surrounding suburbs
The Southern Ontario tornado outbreak of 2005 was a series of thunderstorms on the afternoon of August 19, 2005, that spawned tornadoes damaging homes in the Conestoga Lake, Fergus, and Tavistock areas. A tornado was reported within the Toronto city limits, although this was never officially confirmed by the Meteorological Service of Canada. The storms morphed into heavy rain cells when reaching Toronto. The Insurance Bureau of Canada has estimated that insured losses were the highest in the province's history, exceeding 500 million Canadian dollars, two and a half times that of Ontario's losses during the 1998 ice storm and the second largest loss event in Canadian history until another event of torrential rain of July 8, 2013 (1 billion CAD). (Full article...)
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This page documents all tornadoes confirmed by various weather forecast offices of the National Weather Service in the United States in November 2017. Based on the 1991–2010 averaging period, 58 tornadoes occur across the United States throughout November while 24 more occur in December.

Despite only four days, producing tornadoes, November saw two outbreak days that produced over a dozen. However, the month was still well below average with 42 tornadoes. Tornado events in December were generally small and an also well below average 12 tornadoes were confirmed, which is half of the number of tornadoes typically seen during the month. (Full article...)
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The 2013 Moore tornado was an EF5 tornado that struck Moore, Oklahoma on May 20, 2013, killing 24 people and causing over $2 billion in damage.

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Locations of all the killer tornadoes in the United States in 2001.
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. (Full article...)
List of tornadoes by year

Recent tornado outbreaks

Recent tornado outbreaks

July

  • July 1
A violent EF4 tornado hits Mountain View County, Alberta, Canada, becoming only the third EF4 tornado in the province's history. (Northern Tornadoes Project)
  • July 12–13
Several tornadoes occur in the Midwestern United States and Central Canada, including an EF1 tornado that passed through the suburbs of Chicago. (NWSChicago)
  • July 16
A rare EF1 tornado touches down in Aguada, Puerto Rico, significantly damaging two houses. (Iowa State University)


Previous months: June, May

Tornado anniversaries

November 26

  • 1887 – An F2 tornado destroyed barns and a dance hall on the edge of Mineola, Texas. Five people were killed, and 20 injured, when the walls of the dance hall collapsed.

November 27

November 28

  • 1941 – One of the deadliest tornadoes on record in Japan struck Toyohashi, Aichi Prefecture, killing 12 people and injuring 177, with 347 houses severely damage or destroyed.
  • 1988 – Part of a small tornado outbreak, a long-track F4 tornado, which touched down after midnight, traveled 83 miles (134 km) across North Carolina, reaching peak intensity in Raleigh. Two people were killed and 105 people were injured in the Raleigh area, with two other deaths and 49 other injuries elsewhere along the track. In all, the tornado destroyed 476 homes and 78 businesses, with 2000 other homes damaged. Damage totaled $77.2 million (equivalent to $191 million in 2022).

Did you know…

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The following are images from various tornado-related articles on Wikipedia.

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Picture of a house destroyed by the Wallingford Tornado of 1878

Although historically the U.S. state of Connecticut is not typically known to fall casualty to tornadoes, more than 100 of these powerful storms have affected the state in modern history, resulting in at least 48 deaths, 780 injuries, and more than $500 million in damage. This list of tornadoes in the state is likely incomplete, as official records date back only to 1950 for tornadoes in the United States.

As with most of the northeastern United States, the number of tornadoes peaks in the summer months, normally in July or August. Hartford County has had the most tornadoes in the state, although since 1950 Litchfield County has reported the most tornadoes. Several areas have been struck more than once, and Waterbury has been struck by no less than four tornadoes since 1955. (Full article...)

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Works about tornadoes

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