TeachMeFinance.com - explain Knuckles
Knuckles The term 'Knuckles' as it applies to the area of the weather can be defined as ' Slang for 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. They are not mammatus clouds. See also cumuliform anvil and anvil rollover'.
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