[texbirds] Conflicting weather data complicate bird migration radar observation
- From: "John Arvin" <jarvin@xxxxxxxx>
- To: "Texbirds" <texbirds@xxxxxxxxxxxxx>, "LABIRD-L" <LABIRD-L@xxxxxxxxxxxxxxxx>
- Date: Sat, 28 Mar 2015 16:06:00 -0500
Wyoming's upper level winds page
(http://weather.uwyo.edu/upperair/sounding.html) and looked at VAD wind
profiles as measured by NEXRAD and discovered an interesting situation. The
two Louisiana stations showed surface winds from due east while upper level
winds were from the west. Of these two opposing wind flows the upper level
readings are the ones which affect bird migration.
Surface winds this afternoon are S and breezy, really the usual late March
weather most seasons, but we have not seen much of it this year. NEXRAD is
showing numerous "echo trails" of raptor-like kettles on the Brownsville
and Corpus (especially) displays. Reports from the field indicate that a
good variety of early season migrants are present at coastal stopovers in
light to moderate numbers. Diurnal migrants are indicated by the change of
course from S - N to SW - NE at the aptly named coastal bend.
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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