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Rear flank downdraft information


Air circulation in a supercell thunderstorm, including the rear flank downdraft

The rear flank downdraft (RFD) is a region of dry air wrapping around the back of a mesocyclone in a supercell thunderstorm.[1] These areas of descending air are thought to be essential in the production of many supercellular tornadoes. Large hail within the rear flank downdraft often shows up brightly as a hook on weather radar images, producing the characteristic hook echo, which often indicates the presence of a tornado.[1]

  1. ^ a b National Weather Service. "A Comprehensive Glossary of Weather Terms for Storm Spotters". NOAA. Retrieved 2010-05-24.

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Rear flank downdraft

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The rear flank downdraft (RFD) is a region of dry air wrapping around the back of a mesocyclone in a supercell thunderstorm. These areas of descending...

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Supercell

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rain-free updraft base or main updraft (not visible to radar). The rear flank downdraft, or RFD, carries precipitation counterclockwise around the north...

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Vertical draft

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Flight 441 — airplane crash linked to severe downdraft Rear flank downdraft and forward flank downdraft Thermal Park, Chris (2007). A Dictionary of Environment...

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Tornado

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with it an area of quickly descending air known as the rear flank downdraft (RFD). This downdraft accelerates as it approaches the ground, and drags the...

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Hook echo

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it is more dense and sinks down behind the cloud and forms the rear flank downdraft, drying the mid-level portion of the back of the cloud. The two currents...

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TWISTEX

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proximate to the tornadic region, generally within the supercell rear-flank downdraft (RFD) outflow, are comparatively rare. Even rarer are mesonet datasets...

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Wall cloud

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are associated with the forward flank downdraft (FFD). Shelf clouds in supercells also form with the rear flank downdraft (RFD), although these tend to...

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Mesocyclone

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known as a mesocyclone. For a tornado to form in this manner, a rear-flank downdraft enters the center of the mesocyclone from the back. Cold air, being...

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Tornadogenesis

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with it an area of quickly descending air known as the rear flank downdraft (RFD). This downdraft accelerates as it approaches the ground, and drags the...

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slot or dry slot (informal term) – an evaporation of clouds as a rear flank downdraft descends and dries out cloud and occludes around a mesocyclone. Cloud...

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RFD

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RedFlagDeals.com, a Canadian bargain hunting, coupon, and forums website. Rear flank downdraft, an area of quickly descending air associated with rotating thunderstorms...

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Convective storm detection

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a low-level boundary, tornadogenesis is highly unlikely unless a rear flank downdraft occurs, which is usually visibly evidenced by evaporation of cloud...

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Downburst

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toward the surface by dynamical processes in a thunderstorm (see rear flank downdraft).[citation needed] Most downbursts are less than 4 km (2.5 mi) in...

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Storm chasing

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struck and some injured by this tornado and its parent supercell's rear flank downdraft (RFD). While chasing severe storms, a vehicle driven by Randall Yarnall...

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List of United States tornadoes in May 2024

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trees were damaged or snapped. In total, 30 people were injured. Rear flank downdraft winds upwards of 90 mph (140 km/h) continued through Temple. EF1...

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Cyclogenesis

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with it an area of quickly descending air known as the rear flank downdraft (RFD). This downdraft accelerates as it approaches the ground, and drags the...

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Tornado myths

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changes or effects on the tornado itself from factors such as its rear flank downdraft. A change of direction proved deadly in the 2013 El Reno tornado...

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Severe thunderstorm warning

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main updraft core. Typically a tornado, if present, will form in this area. This is called a Rear Flank Downdraft and can be a sign of tornado genesis....

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Funnel cloud

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these funnel clouds. Brief funnels also are observed with some rear flank downdrafts (RFDs) (within inflow or outflow areas, and especially within inflow-outflow...

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Descending reflectivity core

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Dakota, cyclic tornadic supercell of 22 May 2012: Surface analysis of rear-flank downdraft evolution and multiple internal surges. Mon. Wea. Rev., 140, 3419–3441...

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Tornadoes of 2017

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Alabama, causing considerable damage at a local festival grounds. Rear flank downdraft winds away from the Rehobeth tornado killed four people when a large...

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Glossary of tornado terms

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Branch (FDTB) Forecast Systems Laboratory (FSL) Forward-flank downdraft (or front-flank downdraft) (FFD) Fractus cloud (Fr) Front Frontogenesis Fujita scale...

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Overshooting top

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mesocyclones located near the interchange of the rotating updraft and the rear flank downdraft (RFD). Hail; if the updraft is strong enough to produce an overshooting...

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Tornadoes of 2013

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a significant downdraft. The tornado was estimated to have touched down around 5:40 pm along the north side of the rear-flank downdraft. Moving along...

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