Port Mansfield, TX to the Rio Grande River 20 - 60 NM Marine Forecast
| Today...Northeast Winds 15 To 20 Knots, Diminishing To 10 To 15 Knots This Afternoon. Seas 5 To 7 Feet, Occasionally To 9 Feet, Subsiding To 4 To 5 Feet This Afternoon. Wave Detail: Northeast 6 Feet At 7 Seconds And South 1 Foot At 5 Seconds, Becoming Northeast 5 Feet At 7 Seconds And South 1 Foot At 5 Seconds. |
| Tonight...East Winds Around 10 Knots, Becoming South Early In The Morning. Seas 3 To 4 Feet. Wave Detail: Northeast 4 Feet At 7 Seconds And South 1 Foot At 5 Seconds. |
| Saturday...South Winds 10 To 15 Knots. Seas 3 To 4 Feet. Wave Detail: East 3 Feet At 7 Seconds And South 2 Feet At 4 Seconds. |
| Saturday Night...South Winds 10 To 15 Knots. Seas 3 To 4 Feet. Wave Detail: Southeast 3 Feet At 6 Seconds. |
| Sunday...South Winds 5 To 10 Knots, Becoming Southeast Late In The Afternoon. Seas 2 To 3 Feet. Wave Detail: Southeast 3 Feet At 6 Seconds. A Slight Chance Of Showers And Thunderstorms In The Afternoon. |
| Sunday Night...Southeast Winds Around 10 Knots. Seas 2 To 3 Feet. Wave Detail: Southeast 2 Feet At 5 Seconds. A Slight Chance Of Thunderstorms Early In The Evening. A Slight Chance Of Showers. |
| Monday...Southeast Winds 5 To 10 Knots. Seas 2 To 3 Feet. A Slight Chance Of Showers In The Morning. |
| Monday Night...Southeast Winds Around 10 Knots. Seas 2 To 4 Feet. |
| Tuesday...Southeast Winds Around 10 Knots. Seas 3 To 4 Feet. |
| Tuesday Night...Southeast Winds Around 10 Knots. Seas 3 To 4 Feet. Winds And Seas Higher In And Near Thunderstorms. |
| Area Forecast Discussion National Weather Service Brownsville TX 1047pm CST Thu Dec 18 2025 Issued at 1015pm CST Thu Dec 18 2025 Radiational cooling under clear skies tonight has lowered temps to the dewpoint, leaving a bit of fog across Cameron County. This may continue into early Friday morning, with patchy dense fog possible in rural locations, dissipating before sunrise as dry air advects in behind cold frontal passage. Expect cooler temps Friday morning in the 40s and 50s, and more seasonable high temperatures in the 70s Friday. Dry conditions behind the front will bring minimum relative humidity values Friday from 25-35% in Zapata, Jim Hogg, Starr, and Brooks counties, but light winds aloft preclude fire weather concerns. An unseasonably warm weekend and Christmas Week sets up under a heat dome over central CONUS, raising temperatures (both high and lows) to 7-16 degrees above normal. In absence of forcing, this dry, hot pattern will continue through much of next week. The most excitement I'm pleased to share is an approaching frontal boundary that will likely stall before reaching the CWA (County Warning Area) early next week bringing a low chance of showers (around 10%), primarily over the Gulf waters and along the coast. Marine Issued at 1015pm CST Thu Dec 18 2025 A cold front making its way across the Gulf waters tonight will deteriorate conditions through Friday morning, shifting winds to northeasterly to 15-25 kts, gusting to 30 kts, and elevating seas to moderate. A Small Craft Advisory is in place through 9am Friday. Conditions subside and return to favorable by Saturday with south- southeasterly winds and slight seas persisting through next week. NOAA Brownsville TX Office: Watches - Warnings - Advisories TX...None. GM...Small Craft Advisory until 9am CST Friday for GMZ130-132-135- 150-155-170-175. |
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