I actually registered after lurking for close to a decade, just to answer this.
My most memorable weather event would be the severe thunderstorm and microburst in College Park on July 12th. I was about two miles south of it, but I work at UMD and rode my bike around to check out all the damage after power was restored at campus. I had colleagues who lost power at home for days in CP and Olney. In my area, I’d say that’s the most significant storm damage I’ve seen since the derecho. However, the other thing I remember about that event was the intensity of the sunset afterwards—simultaneous lightning, orange and red skies, high arc rainbows—just surreal.