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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. [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 ...
Classical tornadoes are supercellular tornadoes, which have a recognizable pattern of formation. [5] The cycle begins when a strong thunderstorm develops a rotating mesocyclone a few miles up in the atmosphere. As rainfall in the storm increases, it drags with it an area of quickly descending air known as the rear flank downdraft (RFD). This ...
The tornado weakened to EF1 strength and shrunk in size as it crossed E1300 Road, snapping and uprooting trees and ripping a roof off an outbuilding. Homes sustained minor roof damage. Despite being far from the tornado, a single-wide manufactured home along E1295 Road sustained severe damage, likely caused by rear flank downdraft winds. [6]
As the tornado enters the dissipating stage, its associated mesocyclone often weakens as well, as the rear flank downdraft cuts off the inflow powering it. Sometimes, in intense supercells, tornadoes can develop cyclically. As the first mesocyclone and associated tornado dissipate, the storm's inflow may be concentrated into a new area closer ...
For a tornado to form in this manner, a rear-flank downdraft enters the center of the mesocyclone from the back. Cold air, being denser than warm air, is able to penetrate the updraft. The combination of the updraft and downdraft completes the development of a tornado. Tornadoes that form in this method are often violent and can last over an ...
A pivot irrigation system was flipped over and some trees were downed. Rear flank downdraft winds from the tornado inflicted moderate damage to a softball field facility, while also destroying a shed, several signs and scoreboards, and the fencing around the field. [60] EF0 SSW of Wagener to W of Perry: Aiken: SC
Tornadogenesis is most likely at the interface of the updraft and forward flank downdraft, and requires a "balance" between the outflow and inflow. [10] Only wall clouds that rotate spawn tornadoes, and usually precede the tornado by five to thirty minutes. Rotating wall clouds are the visual manifestation of a mesocyclone.
This multi-vortex EF2 tornado, which prompted a tornado emergency for Custer County, Oklahoma, [54] was accompanied by significant rear flank downdraft winds exceeding 100 mph (160 km/h), with the total path width being 2.7 miles (4.3 km) wide.
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