When there's strong enough convection, along with plenty of moisture, a winter storm can produce thundersnow. During a winter storm, snowflakes and sleet pellets high in the clouds can collide.

Thundersnow and thundersleet are pretty rare ... Snow and a wintry mix have developed across the region. Even "hamster-size" snowflakes were reported at the National Weather Service Office ...

“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 ...

Heavy snow, including thundersnow, is falling in Connecticut and moving into the rest of New England. More power outages, thundersnow, and snarled travel is all likely overnight and into Thursday.