[texbirds-freelists] [texbirds] NEXRAD radar observations of migrating birds in the western Gulf coast region; 4/26
- From: John Arvin <jarvin@xxxxxxxx>
- To: texbirds@xxxxxxxxxxxxxxxxxx
- Date: Thu, 26 Apr 2012 14:00:51 -0500
Upper level soundings this morning are showing winds continuing relatively
strong with a distinct SW trend increasing from W to E. These winds are
downslope-type winds off the central plateau of Mexico that promise to
bring blowtorch temperatures to western Texas this afternoon. They may also
wind-drift some circus-Gulf migrants with more westerly migratory routes
(Western Tanager, etc.).
At 14:00 bird echoes were beginning to assume the halo-like signature at
Houston and Lake Charles. With velocities significantly above measured
wind speeds it seems these are definitely migrating birds. The offshore
returns from Brownsville and Corpus were distorted by some sort of
electro-magnetic interference. Velocity images were not too far below
posted wind speeds. Here in Austin the surface winds are quite a bit lower
than at this time yesterday. I hear that late afternoon drop-ins added to
species diversity if not large numbers of birds on most of the Texas and
Louisiana coasts. I expect the same scenario this afternoon.
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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