Thundersnow that happens when thunder and lightning occur during snowfall. The rare weather event can be helpful for predicting a larger storm. Less than one percent of all snowstorms are associated ...

A rare weather event known as "thundersnow" was captured on Feb. 29 in Montreal. Combining a unique mix of snow, lightning and thunder, the snow shower came just before a major storm hit the city.

Less than one percent of all snowstorms are associated with thunder, according to ABC News. They require just the right mix of atmospheric instability and upward motion of warm air that make both ...