fuagf -- in the full sense, thundersnow is lightning and thunder during snowfall and/or originating with/in/from clouds producing snowfall -- usually referring to such as in the video, occurring in the banded shield of snow associated with a strong low-pressure system such as a nor'easter -- also occurs in/associated with stronger individual convective squalls in lake-effect snow events
have seen both types -- there were at least 30 lightning and thunder couplets through the peak of the Blizzard of '78, a number very intense (loud, building-rattling thunder in several instances not beginning until 20 or more seconds after the brilliant flash through near zero-visibility snow/blowing snow and then lasting for 30 or more seconds) -- and the most spectacular lightning and thunder I have ever seen/heard came one evening, back when I was a kid, when these potent but widely spaced, miles apart from each other with clear skies between them, lake-effect snow squalls were rolling through (was in the school band at a school football game; there were maybe 5 of them through the course of the game, none crackling or striking nearby, just in/across pretty much the whole fucking sky, way up; each time the lightning occurred, everybody, including players in the middle of plays, just stopped and froze, silently gaping upward, and then came the ground-shaking thunder that lasted and lasted)
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