- Curved bands of cloud reveal the mesocyclone of a supercell
- W021550Z
- Curved bands of cloud reveal the mesocyclone of a supercell thunderstorm. A small lowering can be seen below the rotating updraft structure. The bright area (“clear slot”) is dry air descending from higher in the atmosphere along the back side of the mesocyclone. This rear flank downdraft or RFD air evaporates cloud material and sometimes precedes a tornado.
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