Baffin Bay to Port Mansfield, TX 20 - 60 NM Marine Forecast
| Today...Northeast Winds 5 To 10 Knots. Seas 2 To 3 Feet. Wave Detail: East 3 Feet At 6 Seconds And East 1 Foot At 9 Seconds. A Chance Of Showers And Thunderstorms Until Late Afternoon, Then A Slight Chance Of Showers And Thunderstorms Late This Afternoon. |
| Tonight...East Winds 10 To 15 Knots. Seas 3 To 4 Feet. Wave Detail: East 4 Feet At 7 Seconds. A Chance Of Showers And Thunderstorms In The Evening, Then A Slight Chance Of Showers And Thunderstorms After Midnight. A Chance Of Showers And Thunderstorms Early In The Morning. |
| Friday...East Winds 10 To 15 Knots. Seas 4 To 5 Feet. Wave Detail: East 4 Feet At 7 Seconds. A Slight Chance Of Showers And Thunderstorms Until Late Afternoon. |
| Friday Night...East Winds 10 To 15 Knots, Diminishing To 5 To 10 Knots After Midnight. Seas 4 To 5 Feet. Wave Detail: East 4 Feet At 7 Seconds. A Slight Chance Of Showers And Thunderstorms In The Evening, Then A Chance Of Showers And Thunderstorms After Midnight. |
| Saturday...East Winds 5 To 10 Knots. Seas 3 To 5 Feet. Wave Detail: East 4 Feet At 7 Seconds. A Chance Of Thunderstorms In The Morning. A Chance Of Showers. A Slight Chance Of Thunderstorms In The Afternoon. |
| Saturday Night...East Winds 10 To 15 Knots, Becoming Southeast 5 To 10 Knots After Midnight. Seas 3 To 4 Feet. Wave Detail: East 3 Feet At 7 Seconds. A Slight Chance Of Showers And Thunderstorms Early In The Evening. A Slight Chance Of Showers And Thunderstorms After Midnight. |
| Sunday...Southeast Winds 5 To 10 Knots, Becoming East In The Afternoon. Seas 2 To 3 Feet. A Slight Chance Of Showers And Thunderstorms. |
| Sunday Night...East Winds Around 10 Knots, Becoming Southeast After Midnight. Seas 2 To 3 Feet. A Slight Chance Of Showers And Thunderstorms Early In The Evening. A Slight Chance Of Showers And Thunderstorms After Midnight. |
| Monday...Southeast Winds 5 To 10 Knots, Becoming East In The Afternoon. Seas 2 To 3 Feet. A Chance Of Showers And Thunderstorms, Mainly In The Morning. |
| Monday Night...East Winds 5 To 10 Knots, Becoming Southeast Early In The Morning. Seas 2 To 3 Feet. A Slight Chance Of Showers And Thunderstorms Early In The Evening. A Slight Chance Of Showers And Thunderstorms After Midnight. Winds And Seas Higher In And Near Thunderstorms. |
| Area Forecast Discussion ...UPDATED National Weather Service Brownsville TX 1238am CDT Thu September 17 2026 Issued at 1043pm CDT Wednesday September 16 2026 Aside from a more expansive area of triple digits possible this Sunday and next Monday, increased cloud coverage and daily low or low to medium chances of rain should limit most inland high temperatures to the upper 90s into the middle of next week, though lower 100s are still possible along/west of US-281, most widespread over Starr and Zapata counties. Dependent on the development of showers/thunderstorms and model guidance trends throughout tonight and Thursday morning, another SPS may issued by the oncoming shifts for the counties along and/or east of US-281 for heat indices of 108- 111 F Thursday afternoon into early Thursday evening. Weather pattern-wise, easterly to northeasterly winds circulating about a surface high pressure spilling from the East Coast to the Gulf is forecast to advect a plume of deep Gulf moisture, with PWATs (Precipitable Waters) measuring up to 2.0-2.4+ in., across deep south Texas beginning tonight and peaking during the day on Thursday; chances of rain increase near the coast late tonight to a low (15-30%) chance by Thursday morning, spreading westward and increasing along the seabreeze boundary to a low to medium (20-40%) along/west of US-281 by the afternoon/evening hours on Thursday, followed by a low to medium (20-40%) chance along/east of US-281 Thursday night and a low to medium (20-50%) chance across the region on Friday. In general, we currently expect that most areas will see anywhere from little or no rainfall to as much as around 0.20-0.30 of an inch in total Thursday into Friday. Nonetheless, given above average moisture content, heavy rain and localized minor flooding are possible within slower-moving or training of convection as well as frequent lightning and/or higher gusts within deeper thunderstorms. Additionally, increased cloud cover on Friday followed by drier air infiltrating the region on Saturday are anticipated to improve risks of heat-related illnesses from moderate to major on Thursday to mostly moderate with heat indices ranging around 103-109 F. Subsidence associated with a high pressure aloft retreating back to the Southern Plains by Friday night cuts down on rain chances to a low (10-20%) chance along/east US-281 on Saturday and Sunday afternoon. Meanwhile, the high pressure begins to weaken, causing heigheights to lower throughout the weekend and into the middle of next week, allowing for moisture and divergence aloft associated with an upper level low spinning over the Gulf to gradually increase and expand chances of rain from a low (15-30%) on Monday a low to medium (20-40%) chance across most of the region by the middle of next week. Moderate to major heat risks return by Sunday and additional SPSs for heat indices of 108-111 F are possible. Marine Issued at 1043pm CDT Wednesday September 16 2026 Gentle to moderate northeasterly to easterly winds continue and slight to moderate (2-4 ft) seas build to moderate (3-5 ft) by Thursday night. Gentle to moderate easterly to southeasterly winds and slight to moderate (1-3 ft) seas return over the weekend. Meanwhile, chances of rain increase late tonight to as much as a medium to high (40-70%) chance on Thursday, with low to medium chances continuing into Saturday and into next week. NOAA Brownsville TX Office: Watches - Warnings - Advisories None. |
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