Multiple-vortex tornado
![](http://upload.wikimedia.org/wikipedia/commons/thumb/f/f8/Dead_Man_Walking_Jarrell_1997.jpg/220px-Dead_Man_Walking_Jarrell_1997.jpg)
A multiple-vortex tornado is a tornado that contains several vortices (called sub-vortices or suction vortices) revolving around, inside of, and as part of the main vortex. The only times multiple vortices may be visible are when the tornado is first forming or when condensation and debris are balanced such that sub-vortices are apparent without being obscured. They can add over 100 mph to the ground-relative wind in a tornado circulation and are responsible for most cases where narrow arcs of extreme destruction lie right next to weak damage within tornado paths.[1]
General
[edit]Suction vortices (or suction spots) are really substructures of many, perhaps all, tornadoes but are not always easily visible. These usually occur at the base of the tornado vortex where the tornado makes contact with the surface. Sub-vortices tend to form after vortex breakdown reaches the surface and are resultant from the ratio of cyclonically incoming and rising air motions. Multi-vortex structure is not unique to tornadoes, occurring in other circulations such as dust devils, but is a natural result of the physics of vortex dynamics.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/f/fb/Tushka%2C_Oklahoma_tornado_April_14%2C_2011.jpg/220px-Tushka%2C_Oklahoma_tornado_April_14%2C_2011.jpg)
Multi-vortex tornadoes should not be confused with cyclically tornadic supercells. These systems can have the tendency to produce many, and very separate tornadoes, called tornado families, existing either at the same time or in succession. A phenomenon similar in nature to multiple vortices is the satellite tornado. It is different from a multiple-vortex tornado in that it exists outside of the main tornado and forms via a different mechanism.[1]
Notable tornadoes
[edit]The largest tornado ever documented was a multiple-vortex tornado. It struck El Reno, Oklahoma, on May 31, 2013, as a rain-wrapped tornado, taking the lives of tornado researcher Tim Samaras, his son Paul, and their TWISTEX colleague, Carl Young. This storm also took the life of local amateur chaser, Richard Henderson.[2] It had a maximum width of 2.6 miles (4.2 km) and a maximum recorded windspeed of at least 313 miles per hour (504 km/h). However, because of a lack of intense property damage, the tornado achieved a rating of EF3 on the Enhanced Fujita scale.[3] Nevertheless, the El Reno tornado is one of the three strongest tornadoes ever recorded in terms of maximum wind speeds, the other two being the 1999 Bridge Creek–Moore tornado which doppler radar measured windspeeds up to 321 miles per hour (517 km/h) mph, later revised to 301±20 mph, and the 2024 Greenfield tornado, which a Doppler On Wheels scanned windspeeds up to 309-318 mph (497-512km/h).
The 1997 Jarrell tornado was a multiple vortex tornado. The infamous “Dead Man Walking” photo of it was at a juvenile stage of sub-vortice development.
See also
[edit]References
[edit]- ^ a b Elite Spotter Workshop crh.noaa.gov Archived 8 August 2010 at the Wayback Machine
- ^ Clay, Nolan (3 June 2013). "Oklahoma storms: Amateur storm chaser took photo of tornado that killed him". The Oklahoman. Archived from the original on 9 March 2016. Retrieved 4 June 2013.
- ^ Jeff Snyder; H. B. Bluestein (2014). "Some Considerations for the Use of High-Resolution Mobile Radar Data in Tornado Intensity Determination". Weather Forecast. 29 (4): 799–827. Bibcode:2014WtFor..29..799S. doi:10.1175/WAF-D-14-00026.1. S2CID 122669043.
External links
[edit]- Multiple Vortex Tornado at the Online Tornado FAQ