Port Mansfield, TX to the Rio Grande River 20 - 60 NM Marine Forecast
| Tonight...Southeast Winds 5 To 10 Knots. Seas 2 To 3 Feet. Wave Detail: Southeast 2 Feet At 5 Seconds. |
| Tuesday...South Winds 5 To 10 Knots. Seas 2 To 3 Feet. Wave Detail: South 1 Foot At 4 Seconds And Southeast 1 Foot At 8 Seconds. |
| Tuesday Night...Southeast Winds 5 To 10 Knots Becoming South 10 To 15 Knots After Midnight. Seas 2 To 3 Feet. Wave Detail: Southeast 2 Feet At 4 Seconds And East 1 Foot At 9 Seconds. |
| Wednesday...South Winds Around 10 Knots. Seas 2 To 3 Feet. Wave Detail: Southeast 2 Feet At 4 Seconds And East 1 Foot At 8 Seconds. |
| Wednesday Night...Southeast Winds 10 To 15 Knots. Seas 2 To 4 Feet. Wave Detail: Southeast 3 Feet At 6 Seconds. |
| Thursday...South Winds 10 To 15 Knots. Seas 2 To 3 Feet. Wave Detail: Southeast 3 Feet At 7 Seconds. |
| Thursday Night...South Winds 10 To 15 Knots. Seas 2 To 4 Feet. |
| Friday...South Winds 10 To 15 Knots. Seas 2 To 3 Feet. |
| Friday Night...South Winds 10 To 15 Knots. Seas 2 To 4 Feet. |
| Saturday...South Winds 5 To 10 Knots. Seas 2 To 4 Feet. |
| Saturday Night...South Winds 10 To 15 Knots. Seas 2 To 4 Feet. |
| Area Forecast Discussion National Weather Service Brownsville TX 1158am CDT Monday August 17 2026 Issued at 1155am CDT Monday August 17 2026 Hot, mainly rain-free, and at times breezy conditions will prevail through the forecast period or through next weekend across Deep South Texas and the Rio Grande Valley as a strong and broad 594-597 dam sub-tropical heat dome remains anchored overhead. High temperatures during this time will range from the upper 90s to the mid 100s. Combine that with dewpoint temperatures in the 70s and heat indices will generally range between 105-115F degrees each day through next weekend. This will continue to result in widespread Moderate (Level 2 of 4) to Major (Level 3 of 4) Heat Risk through next weekend. Additional Special Weather Statements (SPSs) and maybe a Heat Advisory will be needed in the coming days across at least parts of the region with areas closer to the coast most favored due to higher humidity levels. As of 11:50am CDT, the latest visible satellite imagery and radar data depicted a cumulus field over the eastern half of our CWA (County Warning Area) with isolated sprinkles/showers beginning to bubble up. Have decided to bump up Probability of Precipitation slightly between 20-30% this morning/afternoon for areas near the coast to account for the potential for an isolated shower or thunderstorm this afternoon. The best timing for any showers or thunderstorms will be between the hours of 11am-5pm CDT with the greatest confidence being along and east of the IH-69C/US- 281 corridor. The persistently hot and dry antecedent pattern with high evaporation rates and at times breezy conditions will aid in increased fire weather concerns through next weekend, particularly in the Tuesday through Friday time period as minimum relative humidity values get to near Fire Danger Statement (RFD) criteria. Even though, we do not have any fire weather headlines at this time, we urge that you continue to exercise fire weather safety measures. Marine Issued at 1155am CDT Monday August 17 2026 Generally favorable marine conditions are expected along the Lower Texas Coast through the next several days, with light to moderate winds and low to moderate seas in place. However, winds may increase over the Laguna Madre mid to late week, which could require Small Craft Should Exercise Caution at times. NOAA Brownsville TX Office: Watches - Warnings - Advisories TX...None. GM...None. |
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