[texbirds] fw: Martins

From: "John Arvin" <jarvin@xxxxxxxx>
To: "New Texbirds" <texbirds@xxxxxxxxxxxxx>
Date: Fri, 26 Jul 2013 09:29:49 -0500
Fred Collins requested help in observing Purple Martin roosts using NEXRAD 
weather radar. I decided that others might be interested as well so I am 
forwarding my instructions to the list. You need to adjust the Loop 
Duration so that it includes the time the roosts disperse at dawn. I sent 
Fred my instructions about 8:30 and 3 hours worked well at that time, but 
it might me 4 hours by now and will increase as the day goes on. Click on 
your nearest NEXRAD station on the map (my instructions were for the 
Houston/Galveston site).
John C. Arvin
Research Associate
Gulf Coast Bird Observatory
103 West Hwy 332
Lake Jackson, TX 77566
jarvin@xxxxxxxx
www.gcbo.org

Austin, Texas 

----------------------------------------
 From: "John Arvin" <jarvin@xxxxxxxx>
Sent: Friday, July 26, 2013 9:08 AM
To: "Collins, Fred (Commissioner Pct. 3)" <Fred_Collins@xxxxxxxx>
Subject: Martins

Fred,
To see the martin roosts as they leave in the morning, go to 
http://weather.rap.ucar.edu/radar/. In the far right hand column above the 
map showing the Nexrad stations you will see Loop Duration as one of the 
settings. Pull down the menu and click 3 hours (if you do it soon; if not 
adjust accordingly) and then click HGX on the map. The two major roosts I 
can see in the Houston area is one big one just NW of IAH and another 
somewhat smaller one just SW of the big one. I note that Beaumont also has 
a large roost. The roosts can be seen as expanding rings as the martins 
come off the roost and fan out in all directions to forage. On the bar of 
images across the top (the line of little squares that light up from left 
to right as the display runs through the 25 images there is a speed 
adjustment. Slow it down as much as possible to get a better look at the 
roost rings. Remember the 3 hour duration is only for the present time.

John C. Arvin
Research Associate
Gulf Coast Bird Observatory
103 West Hwy 332
Lake Jackson, TX 77566
jarvin@xxxxxxxx
www.gcbo.org

Austin, Texas 


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[texbirds] fw: Martins

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