There was no sign of a Snowy Owl in this area when I was 
there this morning (Mon, 2/20).  I walked the streets along 
Mass Ave, 16th St, and around the Circle, and it was pretty 
uneventful.  There were a few Fish Crows hanging out on a 
rooftop on 16th just north of the circle, but they certainly 
weren't behaving in a way that suggested they were on a 
Snowy Owl.  Of course my view was from street level, so there 
was no way I could see an owl that might be hundered down on 
a rooftop.

Good birding,
Paul Pisano
Arlington, VA