How a snowstorm builds electrical charge
Thundersnow forms when a winter storm develops pockets of rapidly rising air, much like the updrafts in a summer thunderstorm. As air rises, it cools and carries water droplets and ice particles upward. Collisions among ice crystals, heavier ice pellets, and soft hail called graupel can transfer electrical charge. The particles then separate: lighter, often positively charged ice crystals are carried higher, while heavier particles tend to remain lower. That separation creates the electrical imbalance that can produce a lightning strike.
Why the lightning may seem unusually quiet
A flash still heats the air suddenly, producing thunder. But sound does not travel as far or as clearly through a snowstorm as it can through open air. Falling snow and the storm’s layered air can scatter or weaken the sound, while the low clouds often keep the lightning close to the observer. The result is a bright flash followed by a short, muted rumble—or a flash with no thunder audible at all.
That contrast can make thundersnow seem deceptively calm. The lightning is real, but the storm’s snow and low cloud can hide the usual warning of a loud, far-reaching crack.
