Knuckles
[Slang] Lumpy protrusions on the edges, and sometimes the underside, of a thunderstorm anvil.
KNUCKLES
Lumpy protrusions on the edges, and sometimes the underside, of a thunderstorm anvil. They usually appear on the upwind side of a back-sheared anvil, and indicate rapid expansion of the anvil due to the presence of a very strong updraft.
Knuckles - permalink - collapse
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Slang for lumpy protrusions on the edges, and sometimes the underside, of a thunderstorm anvil.
KNUCKLES - The upwind side of a thunderstorm anvil top with mamma-like protrusions along the edge that resemble the knuckles on a hand. These are not mammatus clouds.
Anvil Rollover - [Slang], a circular or semicircular lip of clouds along the underside of the upwind part of a back-sheared anvil, indicating rapid expansion of the anvil. See cumuliform anvil, knuckles, mushroom.
resembling cumulus-type clouds (rather than the more typical fibrous appearance associated with cirrus). A cumuliform anvil arises from rapid spreading of a thunderstorm updraft, and thus implies a very strong updraft. See anvil rollover, knuckles, ...
See anvil rollover, knuckles, mushroom.Cumulus(Abbrev. CU) - detached clouds, generally dense and with sharp outlines, showing vertical development in the form of domes, mounds, or towers.
 See also: Anvil, Thunder, Storm, Thunderstorm, Cloud
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