The phenomenon, known as thundersnow, occurs when a thunderstorm ... Thunder and lightning are much more common in warm, summer months because of convection, the upward motion of air that helps ...

Those collisions create the same static charges as in a summer thunderstorm. With enough static charge, lightning is created. Thundersnow is typically associated with very heavy rates of snow ...

“Thundersnow” rolled into the GTA Friday night with a winter storm that was expected to dump up to 30 centimetres of heavy, wet snow on the city by Saturday morning. Thundersnow is a rare ...