"Thundersnow is a rare weather phenomenon, which is basically a thunderstorm that forms in weather that is cold enough for the precipitation to fall in the form of snow instead of rain. Thundersnow is rare because normally thunderstorms need warm and moist air to form. Cold and drier air, like what occurs during the wintertime, is not very conducive to the development of thunderstorms. The two things that are necessary for thundersnow are the presence of unstable air and a force that will push this unstable air upwards. This force of rising air is provided by strong low pressure. The low pressure will push the unstable air upwards, allow for clouds and thunderstorms to form, and provided that the atmosphere is cold enough, it is thundersnow.

You couldn’t design a more perfect snowstorm for DC. It’s absolutely textbook perfect. It’s gonna be perfect."

According to the most recent reports, the will begin where I live around 7pm. Awesome. :)

Thunder, Thunder, Thunder, ThunderSnow! » We Love DC