Wx Factoid: 10/4/2013
A "knuckle" is a slang term for a lumpy protrusion on the edge and sometimes underside of a thunderstorm anvil.Friday, October 4th 2013, 9:30 am
By:
Richard Clark
A "knuckle" is a slang term for a lumpy protrusion on the edge and sometimes underside of a thunderstorm anvil.
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