- Severe thunderstorm clouds revealed: structural details
- W021629Z
- Severe thunderstorm clouds revealed. A rotating updraft (mesocyclone) feeds a steady supply of warm air into a supercell storm. Below it is a wall cloud where surface based air converges and enters the updraft. Above it and to the left is a thin, light line or clear slot formed by descending dry air in the rear flank downdraft (RFD), which helps to tighten the circulation.
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