[texbirds-freelists] [texbirds] NEXRAD radar observations of migrating birds in the western Gulf coast region; 4/18
- From: John Arvin <jarvin@xxxxxxxx>
- To: texbirds@xxxxxxxxxxxxxxxxxx
- Date: Wed, 18 Apr 2012 14:43:48 -0500
The upper air soundings this morning were somewhat surprising to me in that
they were all solidly N. I had expected a return flow off the Gulf today in
advance of a front predicted for Friday. Perhaps that will occur later in
the day. Wind speeds were 28 at New Orleans and in the upper teens
elsewhere. VAD wind profiles showed that winds had shifted back to the S at
Brownsville and Corpus Christi but remained N at Houston eastward.
Again, flocks of raptor-like birds were moving northward from south of
Brownsville to north of Corpus Christi. There is no visible migration over
the Gulf. Sometimes with light N winds trans-Gulf migrants appear on the
northern Gulf coast without being detected by NEXRAD. They fly low over the
water to take advantage of the slight reduction in headwind speed due to
friction with the water's surface.
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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