In simple terms, thundersnow is what happens when a thunderstorm produces snow instead of rain. This is usually the product of upward moving air. "But it's fairly rare to have convection within a winter storm. (Thunder and lightning are much more common in warm-season thunderstorms, according to meteorologist Jeff Haby.) Thundersnow is typically associated with very heavy rates of snow, which can lead to reduced visibility. And while the snow sometimes muffles the thunder, the lightning can still be seen, said meteorologist Grant Gilmore of WFMY-TV in Greensboro, N.C"
http://www.nbcchicago.com/weather/stories/Thundersnow-Chicago-Winter-Storm-184144451.html
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