Baffin Bay to Port Mansfield, TX Marine Forecast
| Today...East Winds Around 5 Knots, Becoming Northeast This Afternoon. Seas 3 To 4 Feet. Wave Detail: East 4 Feet At 7 Seconds. A Chance Of Showers And Thunderstorms Until Late Afternoon, Then A Slight Chance Of Showers And Thunderstorms Late This Afternoon. |
| Tonight...East Winds Around 10 Knots, Becoming Southeast After Midnight. Seas 3 To 4 Feet. Wave Detail: East 4 Feet At 7 Seconds. A Slight Chance Of Showers And Thunderstorms Early In The Evening. |
| Saturday...North Winds Around 5 Knots, Becoming East In The Afternoon. Seas 3 To 4 Feet. Wave Detail: East 3 Feet At 7 Seconds. A Slight Chance Of Showers And Thunderstorms Early In The Morning. |
| Saturday Night...East Winds Around 10 Knots, Becoming Southeast After Midnight. Seas 2 To 4 Feet. Wave Detail: East 3 Feet At 7 Seconds. |
| Sunday...Southeast Winds Around 5 Knots, Becoming East Late In The Afternoon. Seas 2 To 3 Feet. Wave Detail: East 3 Feet At 6 Seconds. |
| Sunday Night...East Winds Around 10 Knots, Becoming Southeast After Midnight. Seas 2 To 3 Feet. Wave Detail: East 2 Feet At 6 Seconds. |
| Monday...Southeast Winds Around 5 Knots, Becoming East Early In The Afternoon, Then Increasing To 5 To 10 Knots Late In The Afternoon. Seas 2 To 3 Feet. |
| Monday Night...East Winds Around 10 Knots, Becoming Southeast After Midnight. Seas 2 To 3 Feet. A Slight Chance Of Showers And Thunderstorms After Midnight. |
| Tuesday...Southeast Winds Around 5 Knots, Becoming East In The Afternoon. Seas 2 To 3 Feet. A Slight Chance Of Showers And Thunderstorms Until Late Afternoon. |
| Tuesday Night...East Winds 5 To 10 Knots. Seas 2 To 3 Feet. 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 1239am CDT Fri September 18 2026 Issued at 1028pm CDT Thu September 17 2026 Low (15-30%) chances of passing showers along/east I-69 E tonight spread further inland along the seabreeze boundary on Friday, increasing to a low to medium (20-40%) chance along/west US-281 by Friday afternoon as easterly to northeasterly winds flowing about a surface high pressure settling over the Deep South continue to push the back half of a deep Gulf moisture plume westward. Due to above average moisture content anticipated to linger through Friday afternoon, moderate to heavy rain within passing convection is still possible which could lead to brief periods of reduced visibility, slippery roads and nuisance ponding. Additionally, a SPS for heat indices of 108-111 F is possible on Friday for the coastal and inland portions of Cameron, Willacy and Kenedy counties during the afternoon and early evening hours, dependent on cloud coverage, convective development and model trends. Otherwise, mid- and lower-level moisture is anticipated to dry considerably throughout the remainder of Friday night to near or below average by Saturday morning as a result of sinking air associated with a high pressure aloft centering over the Southern Plains, thus cutting down on rain chances to a less than 10% chance on Saturday and a low (15-20%) across the southern portions of the lower and mid Rio Grande Valley on Sunday. Decreasing cloud cover over the weekend is expected to slightly raise temperatures and expand highs in the lower 100s over the Rio Grande Plains (upper 90s elsewhere) on Friday to most areas along/west I-69 E by Sunday and Monday; mainly moderate risks of heat-related illnesses on Friday and Saturday deteriorate to mostly major by Monday. Subsidence begins to wane and moisture profiles steadily moisten throughout next week as the high pressure over the Southern Plains becomes wedged between a stationary upper level low over the eastern Gulf and a series of mid/upper level shortwave troughs translating eastward across the Plains. We currently anticipate for low (15-30%) chances of rain along/east US-281 on Monday to expand and build to region-wide low to medium (30-40% or greater) chances by possibly Tuesday, which could also cause temperatures to cool slightly and improve heat risks to mainly moderate by late week. Additional SPSs remain possible. Marine Issued at 1028pm CDT Thu September 17 2026 Gentle to moderate northeasterly to easterly winds and moderate (3-5 ft) seas continue, becoming easterly to southeasterly winds with slight to moderate (1-3 ft) seas later this weekend. Meanwhile, low to medium chances of rain continue through Friday afternoon before minimizing to low chances into the remainder of this weekend. Low to medium chances of rain return early next week, gradually increasing to a medium chance as the week progresses. NOAA Brownsville TX Office: Watches - Warnings - Advisories None. |
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