My sister in Old Town Alexandria is reporting things like this as well. She's a weather geek, so she and my bro-in-law stocked up on grocery items a few days ago when they knew it was coming.
She said they hit the liquor store yesterday (to get the really high-priority supplies) and that was even running low.
My best friend and her husband also in the area (Reston) stood in line at a grocery store last night for almost two hours.
There’s a funny piece at The corner by Jonah Goldberg about his experience in line in D.C. :
http://corner.nationalreview.com/post/?q=OGU1NzVmYjA5ZjU4Nzg4MzgyNTVkNjNmNGFjZTJjZWI=
I live in Reston and I heard at one of the grocery stores yesterday a couple of people got in a fist fight in the parking lot.