In short, thundersnow is a thunderstorm that occurs in heavy snowfall, often accompanied by thunder and lightning.
It doesn't happen often, which means it can be difficult to capture on camera.
The Weather Channel's Jim Cantore literally flipped out when he experienced thundersnow in Boston over the weekend – multiple times.
Watch him "geek out":https://www.youtube.com/watch?v=PdRWGMyeSYY
