|Cold Monday, Green Christmas?
Daytime Temperatures to Rise 40°F by Christmas Eve
The combination of an inverted trough of low pressure just east of the Texas Gulf Coast and a strong ridge of high pressure nosing into the middle Rio Grande Valley will maintain raw, chilly conditions into the evening of December 22nd. As the high weakens and the low eases northward through the western Gulf overnight and into the morning of December 23rd, winds will diminish and turn more westerly. Patchy to perhaps areas of fog may develop toward daybreak, though still cold surface temperatures should reduce the possibility for widespread dense fog. Residual cold air early on the 23rd will be slow to erode, but enough warmer air will infiltrate the air near the surface to bring afternoon temperatures back into the 60s for most residents of the Lower RGV.
Whatever remaining cool air will disappear during the evening of the 23rd, as increasing southerly winds import modified tropical air back across the Valley; temperatures may change little between afternoon and early morning Christmas Eve, holding in the 60s for most. Surface winds should remain near 10 mph in most areas into the early morning, favoring low clouds over dense fog. However, pockets of dense fog would form, particularly in low lying or wind protected areas, should speeds be lower. Additional information will be provided in updated forecasts and statements.
Any low clouds or fog will quickly recede Christmas Eve morning, followed by a breezy and much warmer afternoon, as springlike conditions return to all of Deep South Texas. A weak front may dip temperatures just a hair for the overnight and into Christmas Day. Unlike in 2004, there will only be various shades of green for the more populated areas of the Lower Rio Grande Valley in 2008!