Port Mansfield, TX to the Rio Grande River Marine Forecast
| Tonight...Southeast Winds 15 To 20 Knots. Gusts To 30 Knots This Evening. Seas 4 To 5 Feet Building To 5 To 7 Feet, With Occasional Seas Up To 8 Feet After Midnight. |
| Friday...Southeast Winds 20 To 25 Knots With Gusts Up To 35 Knots. Seas 6 To 8 Feet, With Occasional Seas Up To 9 Feet. |
| Friday Night...Southeast Winds 20 To 25 Knots With Gusts Up To 30 Knots Decreasing To 15 To 20 Knots After Midnight. Seas 5 To 7 Feet, With Occasional Seas Up To 8 Feet. |
| Saturday...Southeast Winds 15 To 20 Knots. Gusts To 35 Knots In The Afternoon. Seas 6 To 8 Feet, With Occasional Seas Up To 9 Feet. |
| Saturday Night...Southeast Winds Around 20 Knots With Gusts Up To 35 Knots. Seas 6 To 9 Feet, With Occasional Seas Up To 11 Feet. |
| Sunday...Southeast Winds 15 To 20 Knots With Gusts Up To 30 Knots Decreasing To 10 To 15 Knots In The Afternoon. Seas 6 To 9 Feet, With Occasional Seas Up To 11 Feet. A Slight Chance Of Showers And Thunderstorms In The Afternoon. |
| Sunday Night...Southeast Winds 15 To 20 Knots. Seas 6 To 8 Feet, With Occasional Seas Up To 9 Feet. |
| Monday...Southeast Winds 10 To 15 Knots. Seas 5 To 7 Feet, With Occasional Seas Up To 8 Feet. |
| Monday Night...Southeast Winds 10 To 15 Knots. Seas 5 To 7 Feet, With Occasional Seas Up To 8 Feet. A Slight Chance Of Showers And Thunderstorms. |
| Tuesday...Southeast Winds 10 To 15 Knots. Seas 4 To 6 Feet, With Occasional Seas Up To 7 Feet. A Slight Chance Of Showers And Thunderstorms. |
| Tuesday Night...Southeast Winds Around 15 Knots. Seas 4 To 5 Feet. Winds And Seas Higher In And Near Thunderstorms. |
| Area Forecast Discussion National Weather Service Brownsville TX 234pm CDT Thu April 25 2024 ...New SHORT TERM, LONG TER Marine .SHORT TERM... (Tonight through Friday night) Issued at 230pm CDT Thu April 25 2024 The main headline in the short term will continue to be the wind. A tight pressure gradient has produced a windy day across deep South Texas and the Rio Grande Valley so far. As repeating storm systems mature and lift over the Southern Plains in the short term, the mechanism of lower pressure upstream interacting with higher pressure over the Gulf of Mexico will drive stronger winds. Southeast winds will decrease slightly tonight, but will come right back on Friday. A wind advisory will be possible for southeastern sections of the CWA (County Warning Area) on Friday, as some model guidance kicks sustained winds to 30 mph or higher and/or gusts to 40 mph or higher. With marine moisture being well mixed into the low levels of the atmosphere, light fog or haze may slightly limit visibility at times. Elevated waves and longer swell periods will contribute to an elevated rip current risk and a high risk is now in effect, likely to extend through Friday night. The forecast will continue dry in the short term, with partly to mostly cloudy skies. Temperatures will remain above average by about 5 degrees. Lows will be in the 70s. Highs will range from the 80s nearer the coast to the 90s inland. Long Term (Saturday through next Thursday) Issued at 230pm CDT Thu April 25 2024 Tight pressure gradients will remain in place for the start of the long term period, supporting a strong 850mb LLJ (Low Level Jet) running along the Texas Coast up into the Midwest. Stronger winds will likely mix to the surface Saturday, possibly prompting a Wind Advisory for some of the southeastern counties, though conditions appear to be borderline. As we continue through the period, an upper level trough over the central plains will traverse further east, weakening the LLJ and pushing it further offshore. Breezy conditions are likely Sunday, but Wind Advisories look unlikely. Mostly zonal flow aloft looks to dominate the start of the workweek, with weak ridging taking over by mid-week. At the surface southeasterly winds will continue to advect warm, humid air into the region, keeping high temperatures in the upper 80s to low 90s, and low temperatures in the 70s. Overall, rain chances are fairly low through the period, however there are a couple opportunities for some areas to get rain. The first will be Sunday, when a cold front looks to stall just to the north of the CWA, possibly promoting some isolated showers and thunderstorms along the northern CWA border. Beginning Monday, a series of shortwaves moving through the upper level flow could kick off some convection along the Sierra Madre Mountains, and some of those showers and thunderstorms could make it to Deep South Texas before dissipating. The best rain chances look to be Monday night into Tuesday, though confidence is still low, and rain chances are capped at 20-30%. Additionally, with stronger winds offshore for the start of the period, higher seas are expected through at least Monday , most likely resulting in a high risk of rip currents. Marine Issued at 230pm CDT Thu April 25 2024 Tonight through Friday night...Small craft advisory conditions are ongoing through Friday and may be extended into Friday night. A tight pressure gradient is fueling the stronger southeast winds and elevated seas. The stronger winds are helping marine moisture mix into the lower atmosphere, supporting some patchy fog in coastal areas, especially through the overnight and early morning hours. Saturday through next Thursday...Strong pressure gradients along the Lower Texas Coast will likely support elevated winds through the start of the period. Wind speeds will likely decrease by Sunday afternoon, however elevated seas will likely remain a bit longer. Small Craft Advisories will likely be needed through the weekend, and possibly carrying into the day Monday. Light to moderate winds and moderate seas look to continue through the remainder of the period, though some Small Craft Exercise caution headlines may be needed Monday and Tuesday. NOAA Brownsville TX Office: Watches - Warnings - Advisories TX...High Rip Current Risk through Friday evening for TXZ451-454-455. GM...Small Craft Advisory until 7pm CDT Friday for GMZ130-132-135- 150-155-170-175. |
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