Port Mansfield, TX to the Rio Grande River Marine Forecast
| Today...North Winds 25 To 35 Knots, Diminishing To 20 To 25 Knots With Gusts Up To 30 Knots. Seas 10 To 15 Feet, Occasionally To 19 Feet. Wave Detail: Northeast 15 Feet At 9 Seconds And North 6 Feet At 6 Seconds. |
| Tonight...Northeast Winds 15 To 20 Knots. Seas 7 To 10 Feet, Occasionally To 13 Feet, Subsiding To 5 To 7 Feet, Occasionally To 9 Feet After Midnight. Wave Detail: North 10 Feet At 7 Seconds, Becoming Northeast 6 Feet At 8 Seconds. |
| Tuesday...Northeast Winds 10 To 15 Knots, Becoming East Late In The Afternoon. Seas 4 To 6 Feet, Occasionally To 8 Feet, Subsiding To 3 To 4 Feet In The Afternoon. Wave Detail: Northeast 5 Feet At 7 Seconds, Becoming Northeast 4 Feet At 7 Seconds. |
| Tuesday Night...East Winds Around 10 Knots, Becoming Southeast After Midnight. Seas 3 To 4 Feet. Wave Detail: East 3 Feet At 6 Seconds. |
| Wednesday...Southeast Winds Around 10 Knots. Seas 3 To 4 Feet. Wave Detail: East 3 Feet At 6 Seconds. |
| Wednesday Night...Southeast Winds 10 To 15 Knots, Diminishing To 5 To 10 Knots Early In The Morning. Seas 2 To 4 Feet. Wave Detail: Southeast 3 Feet At 6 Seconds. |
| Thursday...Southeast Winds 5 To 10 Knots. Seas 2 To 3 Feet. |
| Thursday Night...Southeast Winds Around 10 Knots, Becoming South After Midnight. Seas 2 To 3 Feet. |
| Friday...South Winds Around 5 Knots, Becoming Southeast Late In The Afternoon. Seas 2 To 3 Feet. |
| Friday Night...South Winds 10 To 15 Knots. Seas 2 To 4 Feet. |
| Area Forecast Discussion ...UPDATED National Weather Service Brownsville TX 1256am CDT Monday Mar 16 2026 Issued at 1047pm CDT Sunday Mar 15 2026 After today's heat spike, which resulted in McAllen tying it's record high of 103F set back in 2008, courtesy of strong compressional heating from a nearby dryline and strong southerly winds, a significant change to the weather pattern is just about underway for all of Deep South Texas and the Rio Grande Valley. Driven by an anomalously strong and emerging 591-591 dam Sonoran heat ridge over the Southwestern U.S. and a mature (neutrally- tilted) powerhouse mid-latitude cyclone over the Midwest/Great Lakes Region, that's producing combination of blizzard conditions in it's cold sector and severe weather in it's warm sector, a very strong cold front (modified Arctic front) will sweep through all of Deep South Texas and the Rio Grande Valley tonight. Accompanying this cold front will be a 40-50F degree drop off in temperatures from this afternoon to Monday morning along with strong to damaging northerly winds 25-35 mph gusting as high as 45-55 mph late tonight into Monday. There could be an isolated case where wind gusts reach 55-60 mph. Multiple hazards, including fire weather and coastal/marine are in effect through the day on Monday in response to the Arctic front and impending weather changes. Latest radar scans and surface analysis shows the cold front quickly advancing southward over Corpus Christi's county warning area (CWA) and knocking on the doors of the Northern Ranchlands. Expect for this cold front to push through Deep South Texas from north to south between midnight and 4am. Along and behind the cold frontal passage. an enhanced pressure and thermal (isollabaric) gradient will result in strong to at times damaging winds. North-northeast winds 25-35 mph are expected to gusts as high as 45-55 mph with isolated gusts up to 60 mph. Isolated power outages are possible, so be prepared. A WIND ADVISORY remains in effect for all of Deep South Texas till 8am CDT and for Brooks, Kenedy, Hidalgo, Willacy, and Cameron counties till 1pm CDT Monday. Through tonight, following the cold frontal passage. temperatures will plummet as these winds will usher in a modified Arctic airmass into the region. By Monday morning, wake up temperatures will be in the upper 40s across parts of the Northern Ranchlands to the mid 50s along the Rio Grande Valley. Amid additional cool air advection (CAA) and the modified Arctic airmass still building into the region, Monday will feature the coolest day of the week with daytime highs struggling to make it out of the 60s, some 30-40F degrees cooler than the highs on Sunday, and ~15F degrees cooler than normal. With the cool airmass fully locked in over the region on top or sufficient radiational cooling on clearing skies, a cold night looms Monday night with overnight lows mainly in the 40s with 50s found along/near the coast. Low relative humidity (RH) values and windy conditions on top of an ongoing drought will result in critical fire weather risk with the potential for fuels becoming combustible upon fire ignition on Monday across Deep South Texas. A Red Flag Warning (RFW) remains in effect for all of Deep South Texas, excluding the island from 10pm CDT tonight to 7pm Monday (see FIRE WEATHER SECTION for more details). These strong winds will also create hazardous marine and coastal conditions tonight through Monday (SEE Marine CTION for more details). Beyond Monday night, a warming trend is expected to take place through the remainder of the forecast period. By Thursday, temperatures are expected to return to unseasonable warm levels (80s/90s) across Deep South Texas and the Rio Grande Valley. Marine Issued at 1047pm CDT Sunday Mar 15 2026 A Gale Warning is in effect for the Laguna Madre and Gulf Waters till 7pm CDT Monday. North-northeast winds 25-35 knots gusting up to 40 knots or so is expected. This will drive up high seas with wave heigheights ranging between 13-18 feet. Monday night through Tuesday, marine conditions (seas) will improve in response to the return of lighter winds. By Wednesday, favorable marine conditions are expected to return with low to moderate winds and seas. Favorable marine conditions will prevail through the remainder of the forecast period. Fire Weather Issued at 1047pm CDT Sunday Mar 15 2026 A Red Flag Warning (RFW) is in effect for all of Deep South Texas, excluding the island till 7pm CDT Monday. The combination of low relative humidity (RH) values, windy conditions, and an ongoing drought ranging from D2 Severe to D4 Exceptional, will result in critical fire weather risk on Monday. Any fires that ignite under these conditions will have the potential to become combustible and rather aggressive. We continue to urged everyone to not burn on Monday and continue to exercise safe fire weather conditions. The Texas A&M Forest Service has outlooked the region under a Very High to Extreme Fire Danger for Monday. Energy Release Component (ERC) values will be high across the region on Monday ranging between 75- 100%. Finally, fuels will be dry to critically dry on Monday. Additional fire weather concerns are possible through next weekend due to a continuation of at times low relative humidity levels and breezy conditions, in addition to an ongoing drought. NOAA Brownsville TX Office: Watches - Warnings - Advisories TX...Red Flag Warning until 7pm CDT this evening for TXZ248>255-351- 353>355. Wind Advisory until 8am CDT this morning for TXZ248-249-252. Wind Advisory until 1pm CDT this afternoon for TXZ250-251- 253>255-351-353>355-451-454-455. High Rip Current Risk from 7am CDT this morning through this evening for TXZ451-454-455. High Surf Advisory from 7am this morning to 7pm CDT this evening for TXZ451-454-455. GM...Gale Warning until 7pm CDT this evening for GMZ130-132-135-150- 155-170-175. |
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