Brownsville/Rio Grande Valley, TX
Weather Forecast Office
December Starts to Feel Like It Minor Freezes Affect Valley, Ranchlands December 7/8 2011 |
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Overview Two More Freezes December 8th: Mostly clear skies, a dry start, and calm winds allowed temperatures to fall rapidly after sunset on the 7th, from still cool afternoon temperatures around 60 down into the 40s by 9 PM in most areas. By 10 PM, sheltered locations across the Upper Valley to the King Ranch had reached the upper 30s, on their way to minimum temperatures once again in the mid to upper 20s. Across the Lower Valley, low level winds began turning to the east; while surface winds were light to calm, the influence of the warmer Gulf brough temperatures up a few degrees in most areas when compared with December 7th. Still, a chilly morning (above, right). The back to back freezes compounded the persistent drought, with the coldest temperatures across locations where Exceptional (D4, the worst level) Drought held forth. Chart of 500 mb flow pattern (green lines), surface pressures (dashed cyan lines), and mean relative humidity between 1000 and 500 mb (color shading) at 6 AM CST Wednesday, December 7th, 2011. Note the dry flow (cyan arrow) bringing Canadian air into Texas behind the Upper Level Low pressure system centered in Arkansas. Dark blue color shade indicates humidity below 30 percent; black shades below 10 percent. |
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Brownsville/Rio Grande Valley, TX
20 S. Vermillion Avenue
Brownsville, TX 78521
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