Wow! I can't say that I've ever seen a mix of thunder, snow and lightening during December. After scanning through countless Facebook post I kept seeing the term 'Thundersnow'. I had to Google it and this is what I found:
Thundersnow, also known as a winter thunderstorm or a thunder snowstorm, is a relatively rare kind of thunderstorm with snow falling as the primary precipitation instead of rain. It typically falls in regions of strong upward motion within the cold sector of an extratropical cyclone. Thermodynamically, it is not different from any other type of thunderstorms but the top of the cumulonimbus are usually quite low.
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