[texbirds] Monitoring spring bird migration using NEXRAD weather radar
- From: "John Arvin" <jarvin@xxxxxxxx>
- To: "New Texbirds" <texbirds@xxxxxxxxxxxxx>, "LABIRD-L" <LABIRD-L@xxxxxxxxxxxxxxxx>
- Date: Sun, 31 Mar 2013 10:40:27 -0500
This morning the Brownsville NEXRAD display is showing a suggestion of a
halo signature - a sign that birds are passing over the radar site and
continuing northward. Upper winds are favorable for the arrival of
trans-Gulf migrants but are still moderate in strength; almost 30 kts at
Brownsville and around 20 kts farther north. Corpus Christi is down and
will remain down for a couple of weeks. No site east of Brownsville is
presently showing trans-Gulf arrivals and it is still too early for the
diurnal migrants that depend on thermal heating for lift to be underway.
Satellite imagery shows most of Texas (where severe thunderstorms are
developing) and Louisiana are under heavy cloud cover which is not
conducive to producing thermals. The front generating the stormy weather is
forecast to reach the inner coastal plain (but not the coast itself) and
then to wash out in the evening. I expect an early (seasonally speaking)
modest fallout of trans-Gulf migrants this afternoon and evening. Whether
they will remain on the coast or continue migration once the atmosphere is
stabilized is anyone's guess.
John C. Arvin
Research Associate
Gulf Coast Bird Observatory
103 West Hwy 332
Lake Jackson, TX 77566
jarvin@xxxxxxxx
www.gcbo.org
Austin, Texas
Edit your Freelists account settings for TEXBIRDS at
//www.freelists.org/list/texbirds
Reposting of traffic from TEXBIRDS is prohibited without seeking permission
from the List Owner
Other related posts:
