|MadSci Network: Earth Sciences|
The only term that I have heard applied to this phenomenon is thundersnow.
It is a rare occurrence, because the wintertime atmosphere is more difficult to yield instability.
When thunder and lightning occur during snow, it indicates a strong updraft, just as one would find in a summertime thunderstorm. However instead of heavy rain, heavy snow is the result.
In this situation, snow (or sleet) can accumulate at a rate of several inches per hour.
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