mesocyclone

[mez-uh-sahy-klohn, mes-, mee-zuh-, -suh-]

noun Meteorology.

a small cyclone that arises near a thunderstorm and is sometimes associated with the occurrence of tornadoes.

Origin:
1970–75; meso- + cyclone

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Mesocyclone is always a great word to know.

So is whiteout. Does it mean:

a condition in which uniform illumination from snow on the ground and from a low cloud layer makes features of the landscape indistinguishable

a fog that does not moisten exposed surfaces

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mes·o·cy·clone