textproduct: Brownsville/Rio Grande Valley

KEY MESSAGES

Updated at 544 AM CST Sat Dec 6 2025

- Periods of light rain and/or drizzle continue across Deep South Texas tonight, with rain chances forecast to decrease around sunrise.

- Warmer temperatures are forecast this weekend. The arrival of a cold front Sunday afternoon will bring cooler temperatures to start the work week.

- Adverse marine conditions are likely Sunday evening into Monday behind the passage of the cold front on Sunday.

DISCUSSION

Issued at 1046 PM CST Fri Dec 5 2025

The overrunning pattern that has been dominate for the past couple days looks to break down Saturday as the coastal trough moves further offshore, and the 925-850mb flow shifts more southwesterly. This pattern change will likely result in drier low-level flow advecting into the region, likely decreasing cloud cover slight Saturday afternoon, and decreasing the potential for any light rain or drizzle. The decreased cloud cover will allow high temperatures to increase to the 70s Saturday and into the 80s on Sunday.

This pattern will further break down Sunday afternoon with the arrival of a deep cold front. This front will likely usher in mostly sunny to sunny skies and near zero rain chances for the first half of next week. In addition, CAA behind the front will likely drop low temperatures back to the mid 40s to low 50s Sunday and Monday nights. High temperatures will likely range from the 60s to 70s Monday, gradually increasing to the 80s by mid week as southeasterly winds return Tuesday.

AVIATION

(12Z TAFS) Issued at 544 AM CST Sat Dec 6 2025

Less than ideal aviation conditions will occur at the aerodromes through the next 24 hours. A TEMPO has been included for several of the morning hours to account for precipitation streaming out of Mexico, and is based on the HRRR model. Overall, MVFR to VFR is expected.

MARINE

Issued at 1046 PM CST Fri Dec 5 2025

Generally favorable marine conditions are expected Saturday and Sunday morning. However, a cold front Sunday afternoon will likely bring stronger winds and higher seas through Monday afternoon, likely requiring a Small Craft Advisory for the Gulf waters and Laguna Madre. Conditions look to begin improving Monday afternoon, with generally favorable conditions forecast to return by Monday night and continue through the remainder of the forecast.

PRELIMINARY POINT TEMPS/POPS

BROWNSVILLE 77 66 85 57 / 10 10 10 10 HARLINGEN 77 62 86 51 / 10 10 0 0 MCALLEN 79 66 87 54 / 10 10 0 0 RIO GRANDE CITY 79 62 88 50 / 20 0 0 0 SOUTH PADRE ISLAND 74 70 78 58 / 20 10 10 10 BAYVIEW/PORT ISABEL 75 65 83 55 / 10 10 10 0

BRO WATCHES/WARNINGS/ADVISORIES

None.