Thanks to all those who contined to post.  I managed to finally get out 
and wound up with three lifers:  the Harris' sparrow at about 8:30 AM in 
Columbia, about a dozen Wilson's snipe at Oxbow Lake around 9:45 AM when 
the fog lightened considerably, and one red-throated loon just before I 
gave up at the Severn Inn in Annapolis around 11:15 AM.  The view of the 
loon was a bit distant even with the scope and there was lots of mist, 
but the consistently upturned bill and the slender profile were clear.  
I was standing in the park next to the pier looking under the bridge in 
I believe a westerly direction.

Thanks to Ira of Laurel for his company in Columbia and for guiding me 
quickly from Columbia to Oxbow.

There were at least a dozen snipe at Oxbow, along with one nice pair of 
green-winged teal side by side.  The four great blue herons seemed to 
have very fresh crisp plumage.

Strange weather day but great for some of us.

Gary Ender
Bethesda MD