Rear Flank Downdraft (or RFD) - A region of dry air subsiding on the back side of, and wrapping around, a mesocyclone. It often is visible as a clear slot wrapping around the wall cloud.
RFD - Rear Flank Downdraft. A strong downdraft of air on the upwind side of a thunderstorm, usually a supercell, which is separated from the forward flank (outflow) regions of the storm.
The structure typically is most pronounced on the leading edge of the updraft, while drier air from the rear flank downdraft often erodes the clouds on the trailing side of the updraft.BarometerAn instrument for measuring atmospheric pressure.
Triple point also may refer to a point on the gust front of a supercell, where the warm moist inflow, the rain-cooled outflow from the forward flank downdraft, and the rear flank downdraft all intersect; ...
A clear slot is believed to be a visual indication of a rear flank downdraft.
During the mature stage of the tornado, the rear flank downdraft (RFD) air accelerates, causing the gust front and flanking line to surge rapidly eastward relative to the tornado.
The "hook echo" is the area of confluence between the main updraft and the rear flank downdraft (RFD). This indicates the position of the mesocyclone.
Bounded weak echo region (or BWER) ...
The main region of downdraft in the forward, or leading, part of a supercell, where most of the heavy precipitation is. Compare with rear flank downdraft. See pseudo-warm front and supercell.
Fractus ...
Forward Flank Downdraft - The main region of downdraft in the forward, or leading, part of a supercell, where most of the heavy precipitation is. Compare with rear flank downdraft. See pseudo-warm front, and Fig. 7, supercell.
with a visual appearance including cloud striations that are curved in a manner similar to the stripes of a barber pole. The structure typically is most pronounced on the leading edge of the updraft, while drier air from the rear flank downdraft ...
 See also: Storm, Downdraft, Updraft, Tornado, Cloud
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