Laguna Madre from Port Mansfield to Baffin Bay Marine Forecast
| Today...North Winds 5 To 10 Knots, Becoming Northeast Late This Afternoon. Light Chop On The Bay. |
| Tonight...East Winds Around 5 Knots, Becoming South In The Late Evening And Overnight. Light Chop On The Bay. |
| Friday...South Winds 5 To 10 Knots, Becoming Southeast Late In The Afternoon. Light Chop On The Bay. |
| Friday Night...Southeast Winds 5 To 10 Knots. Light Chop On The Bay. A Slight Chance Of Showers And Thunderstorms After Midnight. A Chance Of Showers And Thunderstorms Early In The Morning. |
| Saturday...Southeast Winds 5 To 10 Knots. Light Chop On The Bay. A Chance Of Showers And Thunderstorms Early In The Morning, Then A Chance Of Showers With A Slight Chance Of Thunderstorms Late In The Morning. |
| Saturday Night...Southeast Winds 5 To 10 Knots. Light Chop On The Bay. A Slight Chance Of Showers And Thunderstorms After Midnight. |
| Sunday...Northeast Winds 5 To 10 Knots, Increasing To 15 To 20 Knots. Light Chop On The Bay, Increasing To Choppy. A Slight Chance Of Thunderstorms In The Morning. A Chance Of Showers. |
| Sunday Night...Northeast Winds 20 To 25 Knots, Diminishing To 15 To 20 Knots After Midnight. Rough On The Bay, Diminishing To Choppy After Midnight. A Slight Chance Of Showers. |
| Monday...Northeast Winds 10 To 15 Knots. A Moderate Chop On The Bay. |
| Monday Night...East Winds 5 To 10 Knots, Becoming Southeast After Midnight. Light Chop On The Bay. Winds And Waves Higher In And Near Thunderstorms. |
| Area Forecast Discussion National Weather Service Brownsville TX 1040pm CST Thu Dec 11 2025 Issued at 1027pm CST Thu Dec 11 2025 The forecast period of Deep South Texas and the Rio Grande Valley is expected to be mainly rain-free with maybe a couple of chances for rain and warmer than normal temperatures. Through tonight, the main weather concern will be the potential for some fog/mist/low stratus to develop. Current observations show clear skies over the region fostering strong radiational cooling. Dewpoint depressions were seen ranging between 0F to 3F degrees. The HREF model is indicating a general medium (40-60%) chance/risk for fog developing across much of Deep South Texas and the Rio Grande Valley tonight. Not confident at this time to issue a Dense Fog Advisory and will need to monitor trends through the night for that. That said, there is enough confidence to insert the potential for some mist/fog/low stratus developing tonight. Otherwise, expect for a quiet night under mostly clear skies and milder than normal temperatures. As highlighted earlier, much of the forecast period will be dry/rain- free. That said, Sunday will feature our next best and widespread chance for showers to develop. A strong southward advancing cold front, associated with an Arctic 1040-1045 mb surface high pressure system that will be centered over the Midwest, will approach the region. As this happens, the combination of increased surface convergence and a nearby weak shortwave trough will increase the prospects for showers (maybe an isolated thunder) to develop over the region on Sunday. Currently, we have a medium (40-60%) chance for showers across Deep South Texas on Sunday. Rain chances diminish from north to south as the cold front sweeps through the region and shifts into northeastern Mexico. Up, down, up (roller-coaster) temperature pattern will take place through the forecast period or through next Friday, thanks to the cold front that will sweep through the region on Sunday. Overall, temperatures will average out warmer than normal for the balance of the forecast period with daytime highs in the 80s each day except for Sunday through Tuesday. Ahead of the cold front on Sunday, high temperatures will top out in the 70s most places (lower 80s along parts of the RGV). Monday is forecast to be the coolest day of the forecast period with daytime highs in the 60s most places (70s along the RGV). Finally, on Tuesday, temperatures will begin to moderate as daytime highs are expected to climb back into the 70s most places. Overnight low temperatures will mainly be in the 50s and 60s during the forecast period. Marine Issued at 1027pm CST Thu Dec 11 2025 Favorable marine conditions with low to moderate winds and seas will persist through Saturday night. On Sunday, marine conditions deteriorate with Small Craft Exercise Caution (SCEC) to Small Craft Advisory (SCA) conditions developing in response the aforementioned cold front. These conditions will persist through Monday/Monday evening before showing some improvements with mainly moderate seas. NOAA Brownsville TX Office: Watches - Warnings - Advisories TX...None. GM...None. |
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