I love Thundersnow. The last time witnessed it, I was living in Chicago and it totally jacked up Lake Shore Drive. Plus, we got a week off of school, so there's a special place in my heart for Thundersnow.
I never imagine snowstorms to have thunder and lightning. That seems to be more of a humid Summer storm feature
I've seen weirder. Including "ball lightning" (which is a real thing that has been witnessed and photographed by dozens of people) and this mysterious green "flash" lightning over the horizon that I'm glad my brother saw too since everyone would have thought I was crazy I only saw each one time, and amazingly within less than a year of each other too (might have been 2003 I think, around that time)
Other rare and cool weather phenomena you may be interested enough to look up include: Red sprites and blue jets, sun and light pillars, sundogs, circumzenithial arcs, horseshoe vortices, brocken spectre, noctilucent clouds and mammatus clouds. As you can see - I'm a bit of a weather nut
Not that we knew of, but we were out in it when the lightning began striking. We had just found out school was cancelled, and a few of us went for a walk in it (the snow was less than an inch when they cancelled them, but started accumulating quickly).