More news on the SNOWY OWL.  I contacted Joe, the guy from americablog,
and here's his reply,

"Thanks for the posting...and as I write this, I can see the SNOWY OWL. 
He's on a building across the street from the one s/he was on Saturday. 
It is at the corner of 20th St. & Kalorama Rd., NW."

I'm not sure it can be seen from street level, but ceratinly worth a
look if you're in the area.  Good luck if you go look for it.

Good birding,
Paul Pisano
Arlington, VA