High Island to Freeport, TX 20 - 60 NM Marine Forecast
| Today...South Winds 10 To 15 Knots. Seas 4 To 5 Feet. Wave Detail: Southeast 5 Feet At 7 Seconds. Hazy Early This Morning. |
| Tonight...Southeast Winds Around 10 Knots. Seas 3 To 4 Feet. Wave Detail: Southeast 4 Feet At 7 Seconds. |
| Thursday...Southeast Winds 10 To 15 Knots. Seas 3 To 4 Feet. Wave Detail: Southeast 3 Feet At 6 Seconds. |
| Thursday Night...Southeast Winds 10 To 15 Knots With Gusts Up To 20 Knots. Seas 3 To 4 Feet. Wave Detail: Southeast 3 Feet At 6 Seconds. |
| Friday...Southeast Winds 15 To 20 Knots With Gusts Up To 25 Knots. Seas 4 To 5 Feet. Wave Detail: Southeast 4 Feet At 6 Seconds. A Chance Of Showers. |
| Friday Night...West Winds Around 30 Knots, Becoming North After Midnight. Seas 4 To 6 Feet, Occasionally To 8 Feet, Building To 7 To 9 Feet, Occasionally To 11 Feet After Midnight. Wave Detail: Southeast 5 Feet At 6 Seconds, Becoming Northeast 5 Feet At 5 Seconds And South 4 Feet At 7 Seconds. A Chance Of Thunderstorms. Showers Likely, Mainly In The Evening. |
| Saturday...North Winds Around 30 Knots. Seas 9 To 12 Feet, Occasionally To 15 Feet. A Chance Of Showers. |
| Saturday Night...Northeast Winds 20 To 25 Knots, Diminishing To Around 20 Knots After Midnight. Seas 7 To 9 Feet, Occasionally To 11 Feet. |
| Sunday...Northeast Winds 10 To 15 Knots. Seas 5 To 7 Feet, Occasionally To 9 Feet, Subsiding To 4 To 5 Feet In The Afternoon. |
| Sunday Night...East Winds 5 To 10 Knots. Seas 3 To 4 Feet. Winds And Seas Higher In And Near Thunderstorms. |
| Area Forecast Discussion National Weather Service Houston/Galveston TX 527am CDT Wednesday April 29 2026 Issued at 1216am CDT Wednesday April 29 2026 The next 24 hours will be synoptically governed by a strong mid/upper ridge over Mexico and a deepening mid/upper trough over the Great Lakes region. The steepening mid/upper pressure heights gradient will strengthen westerlies in the mid and upper levels overhead, along with a general enhancement of the deep subtropical jet that is prevalent from 700 MB up to at least 200 MB. These features aloft will enhance 0-6KM bulk shear (over 50 knots) across the region on Wednesday. Embedded in the flow will be vort maxes / short waves, adding lift to our sheared environment. Instability and moisture will not be in short supply. Surface based CAPE should remain high areawide, while PWATs (Precipitable Waters) are expected to approach (maybe exceed) 2.0 inches for areas north of I-10. Meanwhile, a frontal boundary should slowly sag southward across the region, adding surface convergence and additional lift to the equation. We'll also have to monitor any residual boundaries from the outflow of Tuesday night's storms. The aforementioned ingredients should prime the SE Texas atmosphere for thunderstorms on Wednesday, w/ the highest chance of showers/storms being north of I-10. That doesn't mean we can't see thunderstorms south of I-10. But the preponderance of data suggests the highest Probability of Precipitation will be north of the corridor. Strong bulk shear and some veering in the LL wind profile could allow deep convective to take on a discrete mode, which would increase the risk of thunderstorms capable of large hail and damaging winds. If any cells manage to train, then localized flash flooding would become a concern. Temperature wise we are looking pretty warm with high humidity. Areas that remain south of the boundary could hit the low 90s with enough sunshine. Certainly a summery feel to the day for many. The synoptic forces begin to change as we head into Thursday and Friday. A robust mid/upper low is expected to push into SW CONUS on Thursday. The overall set up on Thursday might not be THAT different than Wednesday. The boundary that pushes south on Wednesday may stall or even drift northward on Thursday. Where that boundary sets up could be the primary focal of where Thursday's deep convection occurs. But as we head into Friday, the aforementioned mid/upper low ejects eastward, amplifying the subtropical jet over Texas. In addition, the flow aloft becomes increasingly diffluent, supporting significant large-scale lift. At the surface, our boundary begins to sag south as a 1025MB surface high builds into Texas from the north. Though thunderstorms along and south of the boundary are a concern, the best chance of heavier rain may actually be north of the boundary where moist, tropical air overruns the much cooler air below. Cold Air Advection will likely induced a strong LL temperature gradient between the tropical air over the Gulf and the colder continental air surging southward. The gradient coupled with the lift could enhance LL pressure falls near the front, steepening the LL gradient and enhancing northerly winds. These winds may become especially strong near the coast and offshore late Friday and into Saturday. Chance of gales is increasing over the bays and Gulf. Friday's temperatures forecast is very tricky. I'm not going to be surprised if areas behind the front drop into the 50s during the afternoon while areas ahead of the front manage to hit 80. Timing of the front will be key when it comes to afternoon temps. The system exits the picture by Saturday, yielding to a very nice weekend. Temperatures will be well below average. Saturday afternoon temperatures are expected to be in the upper 60s to low 70s. Sunday a tad warming in the mid to upper 70s. Overnight lows are expected to fall into the 40s in our northern zones. Brrrrr! Most elsewhere should drop into the 50s (60s at the beaches). The cool will not last. Expect a warming trend next week along with increasing humidity. We are approaching summer after all. Self Marine Issued at 1216am CDT Wednesday April 29 2026 Generally moderate southeasterly flow and occasionally enhanced swell is expected through Friday. Couldn't rule out a shower or thunderstorm on Wednesday and Thursday. But the primary shower/thunderstorm threat is expected to remain well to the north. There is a much higher chance of rain and thunderstorms on Friday into Saturday morning due to the passage of a strong cold front. Southeast winds may increase somewhat on Friday as the front nears. Very strong northerly winds and building seas are expected behind the front Friday night into Saturday. High-end Small Craft Advisory conditions should easily be accomplished, with an increasing risk of gales for the bays and Gulf. Offshore seas may top 10 feet by Saturday morning. Winds and seas should gradually improve Saturday afternoon into Sunday, with a light to moderate onshore flow regime returning by Monday. NOAA Houston/Galveston TX Office: Watches - Warnings - Advisories TX...None. GM...None. |
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