To follow up on Ross' suggestion.  Here's a link to the current Maryland
eBird bar chart (you can navigate to this yourself easily if you don't want
to copy the link just by going to eBird.org and clicking on bar charts):
http://ebird.org/ebird/GuideMe?reportType=location&bMonth=01&bYear=1900&eMonth=12&eYear=2010&parentState=US-MD&countries=US&states=US-MD&getLocations=states&continue.x=38&continue.y=7&continue=t

It shows the entire month of September as being the best time for PHVI.  By
clicking on the name of a species, you can get to a map of all MD eBird
sightings for that species.  If you click on PHVI and then narrow it down to
the past three years during fall you get the following map:
http://ebird.org/ebird/GuideMe?src=changeDate&speciesCodes=phivir&getLocations=states&states=US-MD&parentState=US-MD&reportType=species&monthRadio=on&bMonth=08&eMonth=10&bYear=2008&eYear=2010&continue.x=38&continue.y=11&continue=Continue

By clicking on a balloon you get the name and date of the location, as well
as the name of the observer.  I clicked a few balloons, and one place that
came up with a lot of sightings was Governor's Bridge Natural Area.  But
there are a variety of locations, so I'd expect it's more a matter of being
in a migrant hot spot at the right time.

I just checked DC quickly on eBird also.  As you'd expect, Rock Creek Park
also has a lot of PHVI sightings.

Hope this helps,
Jim Moore
Rockville, MD

On Fri, Aug 20, 2010 at 12:39 PM, Ross Geredien <>
wrote:
> Great question, Doug.  This is one of my most wanted passerines in
Maryland along with Yellow-bellied Flycatcher, which seems to have a similar
migratory pattern.
>
> One great way to hone in on locations and timing is using eBird (
www.ebird.org): you can query map locations by state(s), month, year(s) and
species.  This can be great for finding the locations with the highest
number of records for a given species in any month of the year.
>
> Ross
>
> --- On Fri, 8/20/10, Doug Norton <> wrote:
>
>
> From: Doug Norton <>
> Subject: [MDOSPREY] places to look for migrating Philadelphia Vireo?
> To: 
> Date: Friday, August 20, 2010, 11:21 AM
>
>
> Hello all,  I've noticed on past postings around labor day that this vireo
seems to move through the region around then.  It's eluded me for years
(current jinx bird) and I'd love to get a look at it this year -- any
suggestions for places within a two hour radius of DC that might increase my
chances?  Any and all suggestions welcome, as well as tips on habitat,
behavior, or alternate opinions of time of year when best seen.  Thanks.
>
>
>
>
>