What is Thundersnow?
Thundersnow is a thunderstorm when the air is cold enough to produce snow instead of rain. Just like in the spring and summer, instability is created when the air above the ground is much colder than the air at the ground.
Tonight, at ground level we are certainly chilly, but above it is much colder and as the upper disturbance that Van has talked about this week moves overhead, it will continue to produce thundersnow with heavier pockets of snowfall.
This will cause a wide range in accumulations, similar to the wide range produced by thunderstorms.