Fire whirl

Whirlwind induced by and often composed of fire

"Fire twister" redirects here. For the 2015 film, see Fire Twister.

Fire whirl

A fire whirl with flames in the vortex

Area of occurrence| Worldwide (most frequent in areas subject to wildfires)
Season| All year (most frequent in dry season)
Effect| Wind damage, burning, propagation/intensification of fires
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A fire whirl, fire devil or fire tornado is a whirlwind induced by a fire and often (at least partially) composed of flame or ash. These start with a whirl of wind, often made visible by smoke, and may occur when intense rising heat and turbulent wind conditions combine to form whirling eddies of air. These eddies can contract to a tornado-like vortex that sucks in debris and combustible gases.

The phenomenon is sometimes labeled a fire tornado, firenado, fire swirl, or fire twister, but these terms usually refer to a separate phenomenon where a fire has such intensity that it generates an actual tornado. Fire whirls are not usually classifiable as tornadoes as the vortex in most cases does not extend from the surface to cloud base. Also, even in such cases, those fire whirls very rarely are classic tornadoes, as their vorticity derives from surface winds and heat-induced lifting, rather than from a tornadic mesocyclone aloft.[1]

The phenomenon was first verified in the 2003 Canberra bushfires and has since been verified in the 2018 Carr Fire in California and 2020 Loyalton Fire in California and Nevada.

## Formation

[edit]

A fire whirl consists of a burning core and a rotating pocket of air. A fire whirl can reach up to 2,000 °F (1,090 °C).[2] Fire whirls become frequent when a wildfire, or especially firestorm, creates its own wind, which can spawn large vortices. Even bonfires often have whirls on a smaller scale and tiny fire whirls have been generated by very small fires in laboratories.[3]

Most of the largest fire whirls are spawned from wildfires. They form when a warm updraft and convergence from the wildfire are present.[4] They are usually 10–50 m (33–164 ft) tall, a few meters (several feet) wide, and last only a few minutes. Some, however, can be more than 1 km (0.6 mi) tall, contain wind speeds over 200 km/h (120 mph), and persist for more than 20 minutes.[5]

Fire whirls can uproot trees that are 15 m (49 ft) tall or more.[6] These can also aid the 'spotting' ability of wildfires to propagate and start new fires as they lift burning materials such as tree bark. These burning embers can be blown away from the fire-ground by the stronger winds aloft.

Fire whirls can be common within the vicinity of a plume during a volcanic eruption.[7][8] These range from small to large and form from a variety of mechanisms, including those akin to typical fire whirl processes, but can result in Cumulonimbus flammagenitus (cloud) spawning landspouts and waterspouts[9] or even to develop mesocyclone-like updraft rotation of the plume itself and/or of the cumulonimbi, which can spawn tornadoes similar to those in supercells.[10] Pyrocumulonimbi generated by large fires on rare occasions also develop in a similar way.[11][1][12][13]

## Classification

[edit]

There are currently three widely recognized types of fire whirls:[14]

* Type 1: Stable and centered over burning area.
* Type 2: Stable or transient, downwind of burning area.
* Type 3: Steady or transient, centered over an open area adjacent to an asymmetric burning area with wind.

There is evidence suggesting that the fire whirl in the Hifukusho-ato area, during the 1923 Great Kantō earthquake, was of type 3.[15] Other mechanism and fire whirl dynamics may exist.[16] A broader classification of fire whirls suggested by Forman A. Williams includes five different categories:[17]

* Whirls generated by fuel distribution in wind
* Whirls above fuels in pools or on water
* Tilted fire whirls
* Moving fire whirls
* Whirls modified by vortex breakdown

The meteorological community views some fire-induced phenomena as atmospheric phenomena. Using the pyro- prefix, fire-induced clouds are called pyrocumulus and pyrocumulonimbus. Larger fire vortices are similarly being viewed. Based on vortex scale, the classification terms of pyronado, "pyrotornado", and "pyromesocyclone" have been proposed.[18]

## Notable examples

[edit]

A flame-filled fire whirl

During the 1871 Peshtigo fire, the community of Williamsonville, Wisconsin, was burned by a fire whirl; the area where Williamsonville once stood is now Tornado Memorial County Park.[19][20][21]

An extreme example of the phenomenon occurred in the aftermath of the 1923 Great Kantō earthquake in Japan, in which a city-wide firestorm in Tokyo produced the conditions required for a gigantic fire whirl that killed 38,000 people in fifteen minutes in the Hifukusho-Ato region of the city.[22]

Numerous large fire whirls (some tornadic) that developed after lightning struck an oil storage facility near San Luis Obispo, California, on 7 April 1926, produced significant structural damage well away from the fire, killing two. Many whirlwinds were produced by the four-day-long firestorm coincident with conditions that produced severe thunderstorms, in which the larger fire whirls carried debris 5 km (3.1 mi) away.[23]

Fire whirls were produced in the conflagrations and firestorms triggered by firebombings of European and Japanese cities during World War II and by the atomic bombings of Hiroshima and Nagasaki. Fire whirls associated with the bombing of Hamburg, particularly those of 27–28 July 1943, were studied.[24]

Throughout the 1960s and 1970s, particularly in 1978–1979, fire whirls ranging from the transient and very small to intense, long-lived tornado-like vortices capable of causing significant damage were spawned by fires generated from the 1000 MW Météotron, a series of large oil wells located in the Lannemezan plain of France used for testing atmospheric motions and thermodynamics.[25]

During the 2003 Canberra bushfires in Canberra, Australia, a violent fire whirl was documented. It was calculated to have horizontal winds of 160 mph (260 km/h) and vertical air speed of 93 mph (150 km/h), causing the flashover of 300 acres (120 ha) in 0.04 seconds.[26] It was the first known fire whirl in Australia to have EF3 wind speeds on the Enhanced Fujita scale.[27]

A fire whirl, of reportedly uncommon size for New Zealand wildfires, formed on day three of the 2017 Port Hills fires in Christchurch. Pilots estimated the fire column to be 100 m (330 ft) high.[28]

Residents in the city of Redding, California, while evacuating the area from the massive Carr Fire in late July 2018, reported seeing pyrocumulonimbus clouds and tornado-like behaviour from the firestorm, resulting in uprooted trees, cars, structures and other wind related damages in addition to the fire itself. As of August 2, 2018, a preliminary damage survey, led by the National Weather Service (NWS) in Sacramento, California, suggested the July 26th fire whirl was equivalent to an EF3 tornado with winds in excess of 143 mph (230 km/h).[29]

On August 15, 2020, for the first time in its history, the U.S. National Weather Service issued a tornado warning for a pyrocumulonimbus created by a wildfire near Loyalton, California, capable of producing a fire tornado.[30][31][32]

## Blue whirl

[edit]

In controlled small-scale experiments, fire whirls are found to transition to a mode of combustion called blue whirls.[33] The name blue whirl was coined because the soot production is negligible, leading to the disappearance of the yellow color typical of a fire whirl. Blue whirls are partially premixed flames that reside elevated in the recirculation region of the vortex-breakdown bubble.[34] The flame length and burning rate of a blue whirl are smaller than those of a fire whirl.[33]

## See also

[edit]

* Tornadoes portal

* Dust devil
* Steam devil
* Waterspout

## References

[edit]

1. ^ a b McRae, Richard H. D.; J. J. Sharples; S. R. Wilkes; A. Walker (2013). "An Australian pyro-tornadogenesis event". Nat. Hazards. 65 (3): 1801–1811. Bibcode:2013NatHa..65.1801M. doi:10.1007/s11069-012-0443-7. S2CID 51933150.
2. ^ Fortofer, Jason (20 September 2012) "New Fire Tornado Spotted in Australia" Archived 27 July 2019 at the Wayback Machine National Geographic
3. ^ Chuah, Keng Hoo; K. Kuwana (2009). "Modeling a fire whirl generated over a 5-cm-diameter methanol pool fire". Combust. Flame. 156 (9): 1828–1833. Bibcode:2009CoFl..156.1828C. doi:10.1016/j.combustflame.2009.06.010.
4. ^ Umscheid, Michael E.; Monteverdi, J.P.; Davies, J.M. (2006). "Photographs and Analysis of an Unusually Large and Long-lived Firewhirl". Electronic Journal of Severe Storms Meteorology. 1 (2): 1–13. doi:10.55599/ejssm.v1i2.3.
5. ^ Grazulis, Thomas P. (July 1993). Significant Tornadoes 1680–1991: A Chronology and Analysis of Events. St. Johnsbury, VT: The Tornado Project of Environmental Films. ISBN 1-879362-03-1.
6. ^ Billing, P., ed. (June 1983). Otways Fire No. 22 – 1982/83 Aspects of fire behaviour. Research Report No.20 (PDF). Victoria Department of Sustainability and Environment. Archived from the original on 3 May 2013. Retrieved 19 December 2012.
7. ^ Thorarinsson, Sigurdur; B. Vonnegut (1964). "Whirlwinds Produced by the Eruption of Surtsey Volcano". Bull. Am. Meteorol. Soc. 45 (8): 440–444. Bibcode:1964BAMS...45..440T. doi:10.1175/1520-0477-45.8.440 (inactive 1 November 2024).`{{cite journal}}`: CS1 maint: DOI inactive as of November 2024 (link)
8. ^ Antonescu, Bogdan; D. M. Schultz; F. Lomas (2016). "Tornadoes in Europe: Synthesis of the Observational Datasets". Mon. Wea. Rev. 144 (7): 2445–2480. Bibcode:2016MWRv..144.2445A. doi:10.1175/MWR-D-15-0298.1.
9. ^ Lareau, N. P.; N. J. Nauslar; J. T. Abatzoglou (2018). "The Carr Fire Vortex: A Case of Pyrotornadogenesis?". Geophys. Res. Lett. 45 (23): 13107–13115. Bibcode:2018GeoRL..4513107L. doi:10.1029/2018GL080667.
10. ^ Chakraborty, Pinaki; G. Gioia; S. W. Kieffer (2009). "Volcanic mesocyclones". Nature. 458 (7237): 497–500. Bibcode:2009Natur.458..497C. doi:10.1038/nature07866. PMID 19325632. S2CID 1129142.
11. ^ Cunningham, Phillip; M. J. Reeder (2009). "Severe convective storms initiated by intense wildfires: Numerical simulations of pyro-convection and pyro-tornadogenesis". Geophys. Res. Lett. 36 (12): L12812. Bibcode:2009GeoRL..3612812C. doi:10.1029/2009GL039262. S2CID 128775258.
12. ^ Fromm, Michael; A. Tupper; D. Rosenfeld; R. Servranckx; R. McRae (2006). "Violent pyro-convective storm devastates Australia's capital and pollutes the stratosphere". Geophys. Res. Lett. 33 (5): L05815. Bibcode:2006GeoRL..33.5815F. doi:10.1029/2005GL025161. S2CID 128709657.
13. ^ Kinniburgh, David C.; M. J. Reeder; T. P. Lane (2016). "The dynamics of pyro-tornadogenesis using a coupled fire-atmosphere model". 11th Symposium on Fire and Forest Meteorology. Minneapolis, MN: American Meteorological Society.
14. ^ Williams, Forman (22 May 2009). "The Occurrence and Mechanisms of Fire Whirls" (PDF). La Lolla, California; Valladolid, Spain: MAE UCSD; Spanish Section of the Combustion Institute. Archived from the original (PDF) on 13 May 2014.
15. ^ Kuwana, Kazunori; Sekimoto, Kozo; Saito, Kozo; Williams, Forman A. (May 2008). "Scaling fire whirls". Fire Safety Journal. 43 (4): 252–7. Bibcode:2008FirSJ..43..252K. doi:10.1016/j.firesaf.2007.10.006.
16. ^ Chuah, Keng Hoo; K. Kuwana; K. Saito; F. A. Williams (2011). "Inclined fire whirls". Proc. Combust. Inst. 33 (2): 2417–2424. Bibcode:2011PComI..33.2417C. doi:10.1016/j.proci.2010.05.102.
17. ^ Williams, Forman A. (2020). "Scaling considerations for fire whirls". Progress in Scale Modeling. 1 (1): 1–4. doi:10.13023/psmij.2020.02.
18. ^ McCarthy, Patrick; Cormier, Leanne (23 September 2020). "Proposed Nomenclature for Fire-induced Vortices". CMOS BULLETIN SCMO. Canadian Meteorological and Oceanographic Society. Archived from the original on 20 October 2020. Retrieved 18 October 2020.
19. ^ Tornadoes of Fire at Williamsonville, Wisconsin, October 8, 1871 Archived 9 October 2022 at Ghost Archive by Joseph M. Moran and E. Lee Somerville, 1990, Wisconsin Academy of Sciences, Arts, and Letters, 31 pp.
20. ^ Skiba, Justin (2 September 2016). "The Fire That Took Williamsonville". Door County Living. Archived from the original on 24 September 2020. Retrieved 22 January 2019.
21. ^ Tornado Memorial Park kiosk historical notes, also see p. 19 Archived 24 June 2021 at the Wayback Machine of the County C Park and Ride lot panel draft pdf
22. ^ Quintiere, James G. (1998). Principles of Fire Behavior. Thomson Delmar Learning. ISBN 0-8273-7732-0.
23. ^ Hissong, J. E. (1926). "Whirlwinds At Oil-Tank Fire, San Luis Obispo, Calif". Mon. Wea. Rev. 54 (4): 161–3. Bibcode:1926MWRv...54..161H. doi:10.1175/1520-0493(1926)54<161:WAOFSL>2.0.CO;2.
24. ^ Ebert, Charles H. V. (1963). "The Meteorological Factor in the Hamburg Fire Storm". Weatherwise. 16 (2): 70–75. Bibcode:1963Weawi..16b..70E. doi:10.1080/00431672.1963.9941009.
25. ^ Church, Christopher R.; Snow, John T.; Dessens, Jean (1980). "Intense Atmospheric Vortices Associated with a 1000 MW Fire". Bull. Am. Meteorol. Soc. 61 (7): 682–694. Bibcode:1980BAMS...61..682C. doi:10.1175/1520-0477(1980)061<0682:IAVAWA>2.0.CO;2.
26. ^ "Fire tornado video". ACT Emergency Services. Archived from the original on 28 November 2018. Retrieved 28 November 2018.
27. ^ "California 'fire tornado' had 143 mph (230 km/h) winds, possibly state's strongest twister ever". USA Today. 3 August 2018. Archived from the original on 28 November 2018. Retrieved 28 November 2018.
28. ^ van Beynen, Martin (11 March 2017). "Firestorm". The Press. pp. C1–C4. Archived from the original on 12 March 2017. Retrieved 12 March 2017.
29. ^ Erdman, Jonathan (3 August 2018). "The Giant Fire Whirl From California's Carr Fire Produced Damage Similar to an EF3 Tornado in Redding, an NWS Survey Found". The Weather Channel. Archived from the original on 5 August 2018. Retrieved 16 February 2019.
30. ^ "A 'fire tornado' warning? Weather service issues what could be a first at California blaze". Archived from the original on 16 August 2020. Retrieved 16 August 2020.
31. ^ Herzmann, Daryl. "IEM :: Valid Time Event Code (VTEC) App". mesonet.agron.iastate.edu. Archived from the original on 1 September 2020. Retrieved 14 September 2020.
32. ^ "Matthew Cappucci (September 13, 2020) California's wildfire smoke plumes are unlike anything previously seen". MSN. Archived from the original on 14 September 2020. Retrieved 14 September 2020.
33. ^ a b Xiao, Huahua; Gollner, Michael J.; Oran, Elaine S. (2016). "From fire whirls to blue whirls and combustion with reduced pollution". Proceedings of the National Academy of Sciences. 113 (34): 9457–9462. arXiv:1605.01315. Bibcode:2016PNAS..113.9457X. doi:10.1073/pnas.1605860113. PMC 5003231. PMID 27493219.
34. ^ Coenen, Wilfried; Kolb, Erik J.; Sánchez, Antonio L.; Williams, Forman A. (July 2019). "Observed dependence of characteristics of liquid-pool fires on swirl magnitude". Combustion and Flame. 285: 1–6. arXiv:2202.06567. Bibcode:2019CoFl..205....1C. doi:10.1016/j.combustflame.2019.03.032. S2CID 132260032.

## Further reading

[edit]

* Graham, Howard E. (1955). "Fire Whirlwinds". Bull. Am. Meteorol. Soc. 36 (3): 99–103. Bibcode:1955BAMS...36...99G. doi:10.1175/1520-0477-36.3.99.

## External links

[edit]

Wikimedia Commons has media related to Fire whirls.

* photo fire whirl outback Australia
* New, Elizabeth (1 November 2012). "Fire tornadoes: a rare weather phenomenon". Australian Geographic. Archived from the original on 6 August 2018. Retrieved 6 March 2017.
* Fire tornado video (whirl) 11 September 2012 Alice Springs Australia
* Photo
* www.abc.net.au/news Australian researchers document world-first fire tornado (Canberra). And https://www.theregister.co.uk/2012/11/21/australian_fire_tornado/
* 2013 'Fire Tornado' video. Canberra 2003 groundtrack, lee side spread, weather. 11:08
* Catalyst story: Fire Tornado
* Another photo
* www.youtube.com Video of a Fire whirl (0:30), Brazil.
* "Rare Footage of Fire Tornado". BBC. 25 August 2010.
* Video of a Fire Tornado in San Diego country
* Fire Whirl Simulations
* 1923 Great Kanto Earthquake - Fire Tornado | Video Archived 3 November 2020 at the Wayback Machine \- Check123

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