Why does thunder snow happen

Thundersnow occurs when normal snowstorm clouds begin to develop upward bumps, known as turrets. These turrets are caused by instability within the storm system, combined with a strong lifting mechanism. Thundersnow is a rare winter storm event that occurs when thunder and lightning happen during a snowstorm. ... The ingredients for thundersnow are similar to a thunderstorm that forms in the summertime: warm, moist air rising toward a colder air mass above, creating instability.

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