Anticyclonic tornado

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An anticyclonic tornado is a tornado which rotates in a clockwise direction in the Northern Hemisphere and a counterclockwise direction in the Southern Hemisphere. [1] The term is a naming convention denoting the anomaly from normal rotation which is cyclonic in upwards of 98 percent of tornadoes.[ citation needed ] Many anticyclonic tornadoes are smaller and weaker than cyclonic tornadoes, forming from a different process, as either companion/satellite tornadoes or nonmesocyclonic tornadoes. [2]

Contents

An anticyclonic tornado near Big Spring, Texas on May 22, 2016 captured by storm chaser Aaron Jayjack. 2016-05-22 Anticyclonic tornado, Big Spring, Texas.jpg
An anticyclonic tornado near Big Spring, Texas on May 22, 2016 captured by storm chaser Aaron Jayjack.

Formation

Most strong tornadoes form in the inflow and updraft area bordering the updraft-downdraft interface (which is also near the mesoscale "triple point") zone of supercell thunderstorms. The thunderstorm itself is rotating, with a rotating updraft known as a mesocyclone, and then a smaller area of rotation at lower altitude the tornadocyclone (or low-level mesocyclone) which produces or enables the smaller rotation that is a tornado. All of these may be quasi-vertically aligned continuing from the ground to the mid-upper levels of the storm. All of these cyclones and scaling all the way up to large extratropical (low-pressure systems) and tropical cyclones rotate cyclonically. Rotation in these synoptic scale systems stems partly from the Coriolis effect, but thunderstorms and tornadoes are too small to be significantly affected. The common property here is an area of lower pressure, thus surrounding air flows into the area of less dense air forming cyclonic rotation. The rotation of the thunderstorm itself is induced mostly by vertical wind shear, specifically clockwise turning as altitude increases (called a veered vertical profile, although backed profiles can occur with anticyclonic supercells).

Various processes can produce an anticyclonic tornado. Most often they are satellite tornadoes of larger tornadoes which are directly associated with the tornadocyclone and mesocyclone. Occasionally anticyclonic tornadoes occur as an anticyclonic companion (mesoanticyclone) to a mesocyclone within a single storm. Anticyclonic tornadoes can occur as the primary tornado with a mesocyclone and under a rotating wall cloud. Also, anticyclonic supercells (with mesoanticyclone), which usually are storms that split and move to the left of the parent storm motion, though very rarely spawning tornadoes, spawn anticyclonic tornadoes. There is an increased incidence of anticyclonic tornadoes associated with tropical cyclones, and mesovortices within bow echoes may spawn anticyclonic tornadoes. [3]

The first anticyclonic tornado associated with a mesoanticyclone was spotted on WSR-88D weather radar in Sunnyvale, California on May 4, 1998. The tornado was an F2 on the Fujita Scale. [4]

Known "anticyclonic tornado" events

Date F#/EF# RatingLocationNotes and References
8 June 1951F3 Corn, Oklahoma First known tornado filmed in the US, a companion or cyclic tornado to another significant tornado. It is officially listed as one tornado event by the CDNS report and the NCDC. [5] [6]
6 June 1975F1 Freedom, Oklahoma One of three tornadoes to touch down in the area. [7] [8] [9]
13 June 1976F3 Jordan, Iowa Tornadoes of 1976#June 13 – A satellite tornado to the F5 Jordan, Iowa tornado. [10] [11]
3 June 1980F1 Grand Island, Nebraska 1980 Grand Island tornado outbreak – First of three anticyclonic tornadoes in the area that night. [12] [13]
3 June 1980F3 Grand Island, Nebraska 1980 Grand Island tornado outbreak – Second of three anticyclonic tornadoes in the area that night. [12] [14]
3 June 1980F1 Grand Island, Nebraska 1980 Grand Island tornado outbreak – Last of three anticyclonic tornadoes in the area that night. [12] [15]
4 April 1981F4 West Bend, Wisconsin 1981 West Bend tornado – Strongest anticyclonic tornado ever recorded. [16]
13 June 1998F2North Oklahoma City, Oklahoma Tornado outbreak of June 13, 1998 – Sixth of seven tornadoes to touch down from the same supercell. [17] [18]
19 April 2002F0 Lubbock, Texas "The tornado was produced by an antimesocyclone, which was located on the north flank of a left-split storm." [19]
6 September 2004F? Chek-Lap-Kok International Airport, Hong Kong Described as a marginal tornado. [20]
24 April 2006F1 El Reno, Oklahoma Second of two F1 tornadoes in the area. [21] [2]
20 June 2006F1 Rushville, Nebraska A house, sheds, and outbuildings were destroyed on a farmstead. [22]
2 October 2007EF0 Bussey, Iowa Tornadoes of 2007#October 2 – This brief anticyclonic touched down in an open field southeast of Bussey, doing no damage. [23]
10 May 2010EF0 Nardin, Oklahoma Tornado outbreak of May 10–13, 2010 – First of five anticyclonic on this day. [24] [25]
10 May 2010EF1 Bray, Oklahoma Tornado outbreak of May 10–13, 2010 – Second of five anticyclonic tornadoes on this day; was very large at times. [24] [26]
10 May 2010EF1Southern Norman, Oklahoma Tornado outbreak of May 10–13, 2010 – Third of five anticyclonic tornadoes on this day; it was likely a satellite tornado to the Norman–Little Axe, Oklahoma EF4 tornado. [24] [27]
10 May 2010EF1 Wayne, Oklahoma Tornado outbreak of May 10–13, 2010 – Fourth of five anticyclonic tornadoes on this day; was up to a 1⁄2 mi (0.80 km) wide and was briefly accompanied by a cyclonic EF0 satellite tornado. [24] [28]
10 May 2010EF1 Lake Eufaula, Oklahoma Tornado outbreak of May 10–13, 2010 – Last of five anticyclonic tornadoes on this day; was up to a 5⁄8 mi (1.0 km) wide. [24] [29]
31 May 2013EF2 Yukon, Oklahoma Tornado outbreak of May 26–31, 2013 – A long-lived strong satellite tornado that was southeast of the record-breaking EF3 El Reno tornado. [30] [31]
4 June 2015EF0 Simla, Colorado Tornadoes of 2015#June 4 – A brief anticyclonic tornado caused no damage. [32] [33]
4 June 2015EF0 Kutch, Colorado Tornadoes of 2015#June 4 – A brief anticyclonic tornado caused no damage. [32] [34]
31 March 2016EF0 Hohenwald, Tennessee Tornadoes of 2016#March 30–April 1 – A brief anticyclonic tornado snapped and uprooted trees, downed several large tree branches and inflicted minor roof damage to a home and barn. [35] [36]
5 April 2017EF1 Shelbyville, Tennessee Tornadoes of 2017#April 4–6 – A landspout anticyclonic tornado snapped damaged trees, cars, and structures. [37] [38]
15 June 2019EF0 Johnsonville, South Dakota Tornadoes of 2019#June 15–16 – This tornado lasted approximately 45 seconds and damaged about seven trees. [39] [40] [41] [42]
13 March 2021EF1 Canyon, Texas Tornadoes of 2021#March 13 — A satellite tornado snapped power poles along Interstate 27. [43]
29 July 2021EF0 Bustleton, Philadelphia, Pennsylvania Tornado outbreak of July 28–29, 2021 – A weak tornado damaged buildings and trees. [44]
27 August 2021EF0 Dougherty, Iowa "This very brief track was found in Sentinel satellite imagery and stayed in fields for its existence. Based on the location in the supercell, inflow wind trajectories along the left side of the track, and striation patterns in the fields, there is a high likelihood that this was an anti-cyclonic tornado." [45]
30 April 2024EF1 Loveland, Oklahoma "An anti-cyclonic tornado damaged some trees. Preliminary information." [46]

See also

Related Research Articles

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<span class="mw-page-title-main">Satellite tornado</span> Tornado that orbits around a parent tornado

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<span class="mw-page-title-main">2012 Tropical Storm Debby tornado outbreak</span>

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<span class="mw-page-title-main">Tornado outbreak of March 6–7, 2017</span> Widespread severe weather and tornado outbreak affecting portions of the Midwestern United States

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<span class="mw-page-title-main">Tornado outbreak of November 30 – December 2, 2018</span> Weather event in the central US

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<span class="mw-page-title-main">March 2019 North American blizzard</span> Colorado Low storm

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<span class="mw-page-title-main">Tornado outbreak of April 13–15, 2019</span> Severe weather effect in the Southeastern United States

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<span class="mw-page-title-main">Tornado outbreak of April 17–19, 2019</span> Weather event in the southern United States of early 2019

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<span class="mw-page-title-main">Tornadoes of 2020</span>

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<span class="mw-page-title-main">Tornado outbreak of February 5–7, 2020</span> 2020 tornado outbreak in the United States

There was a multi-day severe weather and tornado outbreak impacted the Southeastern and Mid-Atlantic United States from February 5–7. A powerful upper-level trough progressed eastward across the country, intersecting an abundant supply of moist air to produce severe weather. An eastward-propagating cold front supported a damaging squall line across the Southeast U.S. on February 5–6; supercell thunderstorms ahead of this line also produced numerous tornadoes. One EF1 tornado in the pre-dawn hours of February 6 killed one person in Demopolis, Alabama. On the morning of February 7, a secondary front progressed across Maryland and Virginia, unexpectedly leading to hundreds of damaging wind reports across Virginia, Maryland, Delaware, New Jersey, New York, Connecticut, Rhode Island, and Massachusetts. Five tornadoes were reported in the Washington, D.C., area, the most on record for a wintertime severe weather event. Across the three-day outbreak, 37 tornadoes were confirmed, including several that were strong and long-tracked.

<span class="mw-page-title-main">Tornado outbreak of April 21–23, 2020</span>

On April 22, 2020, an outbreak of discrete supercell thunderstorms across portions of Oklahoma, Texas, and Louisiana led to widespread severe weather, including multiple strong tornadoes. Two people were killed by a high-end EF2 that struck the town of Madill, Oklahoma, and three more were killed by an EF3 wedge tornado that moved through Onalaska, Texas. Dozens of others were injured as well. The event came to fruition as a trough progressed eastward across the United States, interacting with a moist and unstable environment. Tornado activity continued into Arkansas, Louisiana, Mississippi, Alabama, Florida, and Georgia overnight into the day on April 23. Isolated tornado activity also occurred during the overnight hours on April 21.

<span class="mw-page-title-main">Tornado outbreak of March 16–18, 2021</span> 2021 tornado outbreak and blizzard in the United States

A tornado outbreak occurred on Saint Patrick's Day in the Deep South. Mississippi and Alabama were greatly affected, with numerous tornadoes being confirmed, including four that were rated EF2. Six people were injured by four different tornadoes across Alabama during the outbreak. A non-tornadic fatality also occurred due to a car crash near Natchez, Mississippi. The outbreak began the day before, with a couple tornadoes in Mississippi, and continued over the next two days. The storm moved eastward and affected portions of Florida, Georgia, the Carolinas, and Virginia on March 18, spawning more tornadoes and causing wind damage before the storms pushed offshore that night. In total, 51 tornadoes were confirmed during the event, including 25 in Alabama, making it the sixth-largest tornado event in the state's history, and is sometimes locally referred to as the Saint Patrick's Day tornado outbreak of 2021. The same areas would be hit again by a more significant and destructive tornado outbreak sequence one week later.

<span class="mw-page-title-main">Tornado outbreak of March 5–7, 2022</span> Early spring tornado outbreak in the Midwestern United States

A significant early spring tornado outbreak occurred during the afternoon and evening hours of March 5, 2022 in the Midwest, primarily in the state of Iowa, before transitioning to a damaging wind event across northern parts of Illinois and Indiana. Multiple tornadoes were reported, several of which were produced by a dominant supercell thunderstorm in central Iowa. One long-track, low-end EF4 tornado caused major damage near the towns of Winterset and Norwalk, resulting in six fatalities. Multiple other supercells spawned along an area of moderate destabilization in northern Missouri, prompting further tornado warnings in southern Iowa, as they entered a highly favorable environment for maturing. Large hail and damaging wind gusts accompanied the storms, which continued their passage across the Midwestern states into overnight. More tornadic weather was confirmed in Arkansas and Missouri the next day and into the early morning of March 7. In addition to that, straight line winds killed one person near Hazel, Kentucky when a semi trailer was blown over on US 641. Another non-tornadic fatality occurred in western New York as the storm approached.

<span class="mw-page-title-main">Tornado outbreak of March 21–23, 2022</span> Spring tornado outbreak in the Southern United States

A large tornado outbreak struck the Southern region of the United States on March 21–22, 2022, before transitioning to the Eastern United States on March 23. The outbreak started with numerous supercell thunderstorms and severe squall lines developing in central Texas and southern Oklahoma, prompting the issuance of numerous tornado warnings, including multiple PDS tornado warnings. An EF3 tornado caused considerable damage in Jacksboro, Texas while an EF2 tornado from the same storm caused a fatality in Sherwood Shores. Other strong tornadoes caused damage near College Station and in the Austin and Houston metropolitan areas. Severe and tornadic activity continued into the next day as the system moved eastward with numerous tornadoes reported in Mississippi and Alabama. On the evening of March 22, a supercell moved through the New Orleans metropolitan area, with an EF3 tornado producing severe damage in Arabi, resulting in one death and at least two injuries. Widespread flooding also accompanied the decaying squall line in Alabama. Tornadoes occurred on March 23 over the Eastern United States, associated with the same system, including EF2 tornadoes near Pickens, South Carolina, and Gladesboro, Virginia. In all, 85 tornadoes were confirmed.

<span class="mw-page-title-main">Tornado outbreak of March 29–31, 2022</span> Late March tornado outbreak

Between March 29–31, 2022, a line of strong to severe thunderstorms and multiple supercells swept through portions of the United States and brought widespread wind damage and several strong tornadoes across a large part of the Midwestern, Southern, and Eastern United States. An EF3 tornado was confirmed in Springdale, Arkansas, while an EF1 tornado passed close to downtown Jackson, Mississippi. Numerous tornadoes, some of which were strong occurred over Mississippi, Alabama the evening of March 30 and into the early morning of March 31. Multiple tornadoes also occurred in the Florida Panhandle, including an intense EF3 tornado that killed two people and injured three others near Alford, Florida, and in other states such as North Carolina and Pennsylvania. Producing a total of 90 tornadoes, this was the largest tornado outbreak of 2022.

<span class="mw-page-title-main">April 2022 North American storm complex</span> 2022 American storm complex

The April 2022 North American storm complex affected much of the Rocky Mountains and the Midwestern United States with tornadoes, heavy snow, and gusty winds. The system in general first began impacting the Northwest on April 11, before moving eastward into the Rocky Mountains the following day. It was also responsible for producing a large severe weather outbreak of tornadoes and damaging straight-line wind in the Midwest and South while contributing to a powerful blizzard in the upper Midwest states of North and South Dakota.

<span class="mw-page-title-main">Tornado outbreak of December 12–15, 2022</span> Late-season tornado outbreak in the Southern United States

A four-day tornado outbreak affected the Central and Southern United States in mid-December 2022. The outbreak produced strong tornadoes in Oklahoma, Texas, Louisiana, Mississippi, and Georgia, resulting in severe damage and three fatalities. On December 13, a high-end EF1 tornado was caught on video from multiple angles as it caused considerable damage in Grapevine, Texas, where five people were injured, and multiple EF2 tornadoes caused significant damage in other parts of Texas and Oklahoma that morning. Two large EF2 tornadoes occurred near DeBerry, Texas and Keachi, Louisiana to the southwest of Shreveport, Louisiana, with the second one causing severe damage and two fatalities. An EF3 tornado struck the northern fringes of Farmerville, causing major structural damage and 14 injuries.

References

  1. ↑ Edwards, Roger. "The Online Tornado FAQ". NWS Storm Prediction Center. Retrieved 2019-05-02.
  2. 1 2 Samenow, Jason (5 June 2013). "The rare "anticyclonic" tornado in El Reno, Okla.; not its first encounter". The Washington Post. Retrieved 9 April 2019.
  3. ↑ Stull, Roland B. (2000). Meteorology for Scientists and Engineers (2nd ed.). Thomson Learning. ISBN   9780534372149.
  4. ↑ Monteverdi, John P.; Blier, Warren; Stumpf, Greg; Pi, Wilfred; Anderson, Karl (November 2001). "First WSR-88D Documentation of an Anticyclonic Supercell with Anticyclonic Tornadoes: The Sunnyvale–Los Altos, California, Tornadoes of 4 May 1998". Monthly Weather Review. 129 (11): 2805–2814. Bibcode:2001MWRv..129.2805M. doi:10.1175/1520-0493(2001)129<2805:FWDOAA>2.0.CO;2. S2CID   35163346.
  5. ↑ "Oklahoma Event Report: F3 Tornado". National Centers for Environmental Information. National Weather Service. Retrieved 25 May 2022.
  6. ↑ Grazulis, Thomas (2003). The Tornado Natures Ultimate Windstorm. Norman, OK: University of Oklahoma Press. p. 237. ISBN   9780806135380 . Retrieved 2 June 2020.
  7. ↑ "Oklahoma Event Report: F1 Tornado". National Centers for Environmental Information. National Weather Service. Retrieved 25 May 2022. "Oklahoma Event Report: F1 Tornado". National Centers for Environmental Information. National Weather Service. Retrieved 25 May 2022. "Oklahoma Event Report: F1 Tornado". National Centers for Environmental Information. National Weather Service. Retrieved 25 May 2022.
  8. ↑ "Freedom, Oklahoma Anticyclonic Tornado - June 6, 1975". Youtube. cyclonejimcom. Archived from the original on 2021-12-21. Retrieved 9 April 2019.
  9. ↑ Grazulis, Thomas P. "Twister: Fury on the Plains (1995)". imdb. Music Video Productions (co-production); The Tornado Project. Retrieved 9 April 2019.
  10. ↑ "Iowa Event Report: F3 Tornado". National Centers for Environmental Information. National Weather Service. Retrieved 25 May 2022.
  11. ↑ Brown, John M.; Knupp, Kevin R. (October 1980). "The Iowa Cyclonic-Anticyclonic Tornado Pair and Its Parent Thunderstorm". Monthly Weather Review. 108 (10): 1626–1646. Bibcode:1980MWRv..108.1626B. doi: 10.1175/1520-0493(1980)108<1626:TICATP>2.0.CO;2 .
  12. 1 2 3 "NWS Hastings: June 3, 1980 Grand Island Tornadoes". NWS. Retrieved April 18, 2019.
  13. ↑ "Nebraska Event Report: F1 Tornado". National Centers for Environmental Information. National Weather Service. Retrieved 25 May 2022.
  14. ↑ "Nebraska Event Report: F3 Tornado". National Centers for Environmental Information. National Weather Service. Retrieved 25 May 2022. "Nebraska Event Report: F3 Tornado". National Centers for Environmental Information. National Weather Service. Retrieved 25 May 2022.
  15. ↑ "Nebraska Event Report: F1 Tornado". National Centers for Environmental Information. National Weather Service. Retrieved 25 May 2022. "Nebraska Event Report: F1 Tornado". National Centers for Environmental Information. National Weather Service. Retrieved 25 May 2022.
  16. ↑ "Wisconsin Event Report: F4 Tornado". National Centers for Environmental Information. National Weather Service. Retrieved 25 May 2022.
  17. ↑ "Oklahoma Event Report: F2 Tornado". National Centers for Environmental Information. National Weather Service. Retrieved 25 May 2022.
  18. ↑ Morgan, Mike (13 June 2020). "June 13, 1998: Rare OKC twister defies nature, spins clockwise". Oklahomas News 4. KFOR. Retrieved 15 June 2020.
  19. ↑ "Texas Event Report: F0 Tornado". National Centers for Environmental Information. National Weather Service. Retrieved 25 May 2022.
  20. ↑ Kosiba, Karen A.; Robinson, Paul; Chan, P. W.; Wurman, Joshua (2014). "Wind Field of a Nonmesocyclone Anticyclonic Tornado Crossing the Hong Kong International Airport". Advances in Meteorology. 2014 (597378). Hindawi: 1–7. doi: 10.1155/2014/597378 .
  21. ↑ "Oklahoma Event Report: F1 Tornado". National Centers for Environmental Information. National Weather Service. Retrieved 25 May 2022.
  22. ↑ "Nebraska Event Report: F1 Tornado". National Centers for Environmental Information. National Weather Service. Retrieved 25 May 2022.
  23. ↑ "Iowa Event Report: EF0 Tornado". National Centers for Environmental Information. National Weather Service. Retrieved 10 June 2022.
  24. 1 2 3 4 5 "The May 10, 2010 Tornado Outbreak in Oklahoma". National Weather Service Forecast Office - Norman, Oklahoma. 2010. Retrieved 2019-05-02.
  25. ↑ "Oklahoma Event Report: EF0 Tornado". National Centers for Environmental Information. National Weather Service. Retrieved 25 May 2022.
  26. ↑ "Oklahoma Event Report: EF1 Tornado". National Centers for Environmental Information. National Weather Service. Retrieved 25 May 2022. "Oklahoma Event Report: EF1 Tornado". National Centers for Environmental Information. National Weather Service. Retrieved 25 May 2022.
  27. ↑ "Oklahoma Event Report: EF1 Tornado". National Centers for Environmental Information. National Weather Service. Retrieved 25 May 2022.
  28. ↑ "Oklahoma Event Report: EF1 Tornado". National Centers for Environmental Information. National Weather Service. Retrieved 25 May 2022.
  29. ↑ "Oklahoma Event Report: EF1 Tornado". National Centers for Environmental Information. National Weather Service. Retrieved 25 May 2022.
  30. ↑ "Oklahoma Event Report: EF2 Tornado". National Centers for Environmental Information. National Weather Service. Retrieved 25 May 2022.
  31. ↑ Norman, N. W. S. (2013-06-04). "The tornado count for May 31 will rise as analysis continues, including an anticyclonic EF2 tornado SE of the El Reno tornado. #okwx". @NWSNorman. Retrieved 2019-09-24.
  32. 1 2 "Storm Damage Surveys for June 4th Tornadoes". Denver/Boulder, CO Weather Forecast Office. Retrieved 10 April 2019.
  33. ↑ Colorado Event Report: EF0 Tornado (Report). National Climatic Data Center. 2015. Retrieved November 3, 2015.{{cite report}}: Unknown parameter |agency= ignored (help)
  34. ↑ Colorado Event Report: EF0 Tornado (Report). National Climatic Data Center. 2015. Retrieved November 3, 2015.{{cite report}}: Unknown parameter |agency= ignored (help)
  35. ↑ Tennessee Event Report: EF0 Tornado (Report). National Centers for Environmental Information. 2016. Retrieved November 30, 2016.{{cite report}}: Unknown parameter |agency= ignored (help)
  36. ↑ "March 31, 2016 Tornadoes". National Weather Service.
  37. ↑ Edwards, Christina (7 April 2017). "A "very unique event": Rare anticyclonic tornado touched down in southeastern Tennessee Wednesday". WHNT News (Channel 9 FOX). Retrieved 10 April 2019.
  38. ↑ Tennessee Event Report: EF0 Tornado (Report). National Centers for Environmental Information. 2017. Retrieved November 2, 2017.{{cite report}}: Unknown parameter |agency= ignored (help)
  39. ↑ South Dakota Event Report: EF0 Tornado (Report). National Centers for Environmental Information. 2019. Retrieved January 12, 2020.{{cite report}}: Unknown parameter |agency= ignored (help)
  40. ↑ Donegan, Brian. "A Rare Clockwise-Rotating Tornado Touched Down in South Dakota Last Weekend". Weather.com. Retrieved 19 June 2019.
  41. ↑ Bates, Becky (19 June 2019). "Rare clockwise-spinning tornado touches down in South Dakota". KTVQ. Retrieved 19 June 2019.
  42. ↑ Smith, Grant. "Rare anticyclonic tornado spotted in Deuel County". KELO. Retrieved 19 June 2019.
  43. ↑ "Storm Events Database". National Centers for Environmental Information . Archived from the original on April 12, 2023. Retrieved April 7, 2024.
  44. ↑ Storm Events Database July 29, 2021 (Report). National Centers for Environmental Information. Retrieved November 6, 2021.{{cite report}}: Unknown parameter |agency= ignored (help)
  45. ↑ Storm Events Database August 27, 2021 (Report). National Centers for Environmental Information. Retrieved November 20, 2021.{{cite report}}: Unknown parameter |agency= ignored (help)
  46. ↑ "NWS Damage Survey for 04/30/24 Tornado Event - Update #2" (Public Information Statement). Norman, Oklahoma: National Weather Service Norman, Oklahoma. May 2, 2024. Retrieved May 2, 2024– via Iowa Environmental Mesonet.
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