Laguna Madre from the Arroyo Colorado to Port Mansfield, TX Marine Forecast
| Today...South Winds 5 To 10 Knots, Becoming Southeast Early This Afternoon, Then Increasing To 10 To 15 Knots Late This Afternoon. A Light Chop On The Bay, Increasing To A Moderate Chop On The Bay Late This Afternoon. |
| Tonight...South Winds 10 To 15 Knots, Becoming Southwest 5 To 10 Knots After Midnight. A Moderate Chop On The Bay, Diminishing To A Light Chop On The Bay Early In The Morning. |
| Thursday...South Winds 5 To 10 Knots, Becoming Southeast 10 To 15 Knots Late In The Afternoon. A Light Chop On The Bay, Increasing To A Moderate Chop On The Bay Late In The Afternoon. A Slight Chance Of Showers In The Morning. A Slight Chance Of Thunderstorms. A Chance Of Showers In The Afternoon. |
| Thursday Night...South Winds 10 To 15 Knots. A Moderate Chop On The Bay. A Chance Of Showers Until Early Morning, Then A Slight Chance Of Showers Early In The Morning. |
| Friday...South Winds 10 To 15 Knots, Becoming Southeast 15 To 20 Knots In The Afternoon. Choppy Bay Waters. |
| Friday Night...Southeast Winds 15 To 20 Knots, Becoming South 10 To 15 Knots Early In The Morning. Choppy Bay Waters, Diminishing To A Moderate Chop On The Bay Early In The Morning. |
| Saturday...Southeast Winds 10 To 15 Knots, Becoming Around 15 Knots Late In The Afternoon. A Moderate Chop On The Bay. |
| Saturday Night...Southeast Winds 10 To 15 Knots, Becoming South 5 To 10 Knots Early In The Morning. A Moderate Chop On The Bay, Diminishing To A Light Chop On The Bay Early In The Morning. |
| Sunday...Southeast Winds 5 To 10 Knots, Increasing To 10 To 15 Knots In The Afternoon. A Moderate Chop On The Bay. |
| Sunday Night...Southeast Winds 10 To 15 Knots. A Moderate Chop On The Bay. Winds And Waves Higher In And Near Thunderstorms. |
| Area Forecast Discussion ...UPDATED National Weather Service Brownsville TX 522am CDT Wednesday July 22 2026 Issued at 1049pm CDT Tuesday July 21 2026 As has been the ongoing weather pattern, a 494-497+ dam high pressure aloft is anticipated to linger over the Southern Plains into early next week. Aside from a low to medium end chance of rain Thursday and Thursday night, discussed further below, dry and, at times, breezy conditions continue across deep south Texas along with daily above average, record breaking or tying heat. Wednesday could feature the hottest high temperatures, likely maximizing in the low/mid 100s along/east of I-69 E, while all locations to the west experience mid/upper 100s. Following, inland highs are anticipated to range around 100-106 F, potentially peaking around 107+ F across the Rio Grande Plains. Highs in the mid/upper 80s along and near the coast prevail. Given larger afternoon dewpoint depressions and lower relative humidity coinciding with periods of breezy southeasterly winds, generally gusting to 20-25+ mph, an enhanced risk for wildfire spread prevails and an abundance of caution is urged when handling flames due to dry or normal fuels across the region. Once again, a SPS is in effect from 12pm to 7pm Wednesday for the coastal and inland portions of Cameron, Willacy and Kenedy counties as afternoon and early evening heat indices peak around 108 to 111 F and possibly higher for a brief period of time. Forecast apparent temperatures do not quite satisfy heat advisory criteria for Wednesday. However, should overnight and/or Wednesday morning guidance trend upwards, later shifts could upgrade the SPS to a heat advisory for all or portions of the SPS-outlined areas. Additional SPSs are likely into early next week as daily afternoon heat indices of around 105 to 111+ F result in moderate to major heat risks. Additional heat advisories are not out of the question, perhaps especially early next week when pulses of Gulf moisture could lead to mainly major heat risks with potential pockets of extreme heat risks. In regards to the tropics and as of the 10pm CDT tropical update, Tropical Storm Bertha continues to slowly move to the west over the northern Gulf, with maximum sustained winds of 60 mph. The NHC continues to project Bertha maintaining tropical storm strength along a westward track, bringing the most direct impacts to southern Louisiana/coast into the later part of this week and southeastern Texas/Upper Texas coast later this week and weekend. However, there still exists a considerable amount of uncertainty, especially for the latter half of this week into this weekend. Meanwhile, northeasterly winds on the eastern sides of both the high pressure aloft and a surface high pressure, forecast to move from the Upper Midwest to the Great Lakes later in the week, could displace some or most of Bertha's tropical moisture and convection southwestward, bringing a low (15-30%) chance of rain along/east of US-281/I-69 C during the Thursday morning and afternoon hours, increasing to a region-wide low to medium (20-40%) chance Thursday evening followed by decreasing chances Thursday night. The highest chances of rain are currently expected to reside across the Northern Ranchlands, where the latest 50th and 75th GFS (Global Forecast System) and ECMWF (European Centre for Medium-Range Weather Forecasts) ensemble percentiles indicate anywhere from a trace to as much as a few quarters of an inch of rain by Friday morning, which is more or less in alignment with our forecast of around 0.10-0.20 of an inch, with lesser amounts elsewhere. An increase in moisture with low chances of rain could result in a mostly major heat risk on Thursday as well as on Friday due to lingering deep moisture and subsidence behind the departing system. Yet, due to low confidence at this time, the forecast is subject to change within the next 24 to 48 hours or more. A low risk of life-threatening rip currents continues through Wednesday afternoon. As the week progresses, potential long period swell and perhaps elevated surf, generated by Tropical Storm Bertha, could arrive to the Lower Texas coastal waters later in the week; elevated risks of life-threatening rip currents, higher surf and minor coastal flooding are possible and may lead to more dangerous beach and swimming conditions, despite the inviting Gulf appearance amidst sweltering temperatures and mainly sunny skies. Marine Issued at 1049pm CDT Tuesday July 21 2026 Gentle to moderate southeasterly winds, occasionally fresh, with slight to moderate (2-4 ft) seas are expected to enhance to mostly moderate to fresh, strong at times, with moderate (3-5 ft) seas by Friday. Periods of Small Craft Exercise Caution conditions are possible, especially over the weekend and into early next week. Although the most direct impacts from Tropical Storm Bertha, moving west over the northern Gulf, are currently anticipated to remain well to the north, slightly elevated seas from associated swell could arrive to the Lower Texas coastal waters later this week and/or this weekend. Low (15-30%) chances of rain late Wednesday could increase to as much as a low to medium (20-50%) chance by Thursday morning, followed by gradually diminishing chances Thursday afternoon into Thursday night. Yet, due to the high uncertainty remaining, forecast confidence is low for the latter half of this week into the weekend and highly subject to change over the next 24- 28+ hours. NOAA Brownsville TX Office: Watches - Warnings - Advisories None. |
Brownsville TX Radar
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