FZUS54 KHGX 181143 CWFHGX Coastal Waters Forecast for Texas National Weather Service Houston/Galveston TX 643 AM CDT Mon May 18 2026 Upper Texas coastal waters from High Island to the Matagorda Ship Channel out 60 nautical miles including Galveston and Matagorda Bays. Seas are provided as a range of the average height of the highest 1/3 of the waves...along with the occasional height of the average highest 10 percent of the waves. GMZ300-190015- 643 AM CDT Mon May 18 2026 .Synopsis For High Island to the Matagorda Ship Channel Out 60 NM including Galveston and Matagorda Bays. Strong southeast winds and hazardous seas will continue today into tomorrow morning. Rip currents will likely remain strong today and tomorrow, while water levels remain elevated. Isolated to widely scattered showers are expected today. Shower and thunderstorm chances increase Tuesday and beyond. We are monitoring the potential for a few stronger thunderstorms Tuesday night into early Wednesday. Primary concern from thunderstorms will be strong winds. $$ GMZ335-190015- Galveston Bay- 643 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH TUESDAY MORNING... .TODAY...Southeast winds 20 to 25 knots with gusts up to 30 knots. Bay waters rough. A slight chance of showers with isolated thunderstorms this afternoon. .TONIGHT...Southeast winds 15 to 20 knots with gusts up to 25 knots. Bay waters choppy. .TUESDAY...Southeast winds 15 to 20 knots. Bay waters choppy. .TUESDAY NIGHT...Southeast winds 10 to 15 knots. Bay waters slightly choppy. Showers likely. .WEDNESDAY...Southeast winds around 10 knots. Bay waters smooth to slightly choppy. A chance of thunderstorms. A chance of showers in the morning, then showers likely in the afternoon. .WEDNESDAY NIGHT...Southeast winds 5 to 10 knots. Bay waters smooth. A chance of showers after midnight. .THURSDAY...Southeast winds around 10 knots, increasing to 10 to 15 knots in the afternoon. Bay waters smooth, increasing to slightly choppy in the afternoon. A chance of thunderstorms. A chance of showers in the morning, then showers likely in the afternoon. .THURSDAY NIGHT...South winds 10 to 15 knots, diminishing to around 10 knots after midnight. Bay waters slightly choppy, diminishing to smooth after midnight. A chance of thunderstorms. A chance of showers in the evening, then showers likely after midnight. .FRIDAY...South winds 10 to 15 knots. Bay waters slightly choppy. Showers with a chance of thunderstorms. .FRIDAY NIGHT...South winds 10 to 15 knots, diminishing to around 10 knots after midnight. Bay waters slightly choppy, diminishing to smooth after midnight. Showers likely with a chance of thunderstorms. Winds and waves higher in and near thunderstorms. $$ GMZ330-190015- Matagorda Bay- 643 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH TUESDAY MORNING... .TODAY...Southeast winds around 20 knots with gusts up to 25 knots. Bay waters choppy. .TONIGHT...Southeast winds 15 to 20 knots with gusts up to 25 knots. Bay waters choppy. .TUESDAY...Southeast winds around 15 knots with gusts up to 20 knots. Bay waters slightly choppy. .TUESDAY NIGHT...Southeast winds 10 to 15 knots. Bay waters slightly choppy. A chance of showers. .WEDNESDAY...Southeast winds around 10 knots. Bay waters smooth to slightly choppy. A chance of showers and thunderstorms in the morning. .WEDNESDAY NIGHT...Southeast winds 10 to 15 knots, diminishing to around 10 knots after midnight. Bay waters slightly choppy, diminishing to smooth after midnight. .THURSDAY...Southeast winds around 10 knots, increasing to 10 to 15 knots in the afternoon. Bay waters smooth, increasing to slightly choppy in the afternoon. A chance of thunderstorms in the morning. A chance of showers. .THURSDAY NIGHT...Southeastwinds 10 to 15 knots, diminishing to around 10 knots after midnight. Bay waters slightly choppy, diminishing to smooth after midnight. A chance of thunderstorms. A chance of showers in the evening, then showers likely after midnight. .FRIDAY...South winds around 10 knots. Bay waters smooth to slightly choppy. A chance of thunderstorms. Showers. .FRIDAY NIGHT...Southeast winds 5 to 10 knots. Bay waters smooth. Showers likely with a chance of thunderstorms. Winds and waves higher in and near thunderstorms. $$ GMZ350-355-190015- Coastal waters from Freeport to Matagorda Ship Channel TX out 20 NM-Coastal waters from High Island to Freeport TX out 20 NM- 643 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH TUESDAY MORNING... .TODAY...Southeast winds around 20 knots with gusts up to 30 knots. Seas 5 to 7 feet, occasionally to 9 feet. Wave Detail: Southeast 6 feet at 7 seconds. A slight chance of showers with isolated thunderstorms late. .TONIGHT...Southeast winds 15 to 20 knots with gusts up to 25 knots. Seas 5 to 7 feet, occasionally to 9 feet. Wave Detail: Southeast 6 feet at 7 seconds. .TUESDAY...Southeast winds 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: Southeast 6 feet at 8 seconds. .TUESDAY NIGHT...Southeast winds 15 to 20 knots, diminishing to around 15 knots after midnight. Seas 4 to 5 feet. Wave Detail: Southeast 5 feet at 8 seconds. A chance of showers. .WEDNESDAY...Southeast winds 10 to 15 knots. Seas 3 to 5 feet. Wave Detail: Southeast 4 feet at 8 seconds. A chance of showers. .WEDNESDAY NIGHT...Southeast winds around 10 knots. Seas 3 to 4 feet. Wave Detail: Southeast 4 feet at 7 seconds. .THURSDAY...Southeast winds 10 to 15 knots. Seas 2 to 4 feet. A chance of thunderstorms in the morning. A chance of showers. .THURSDAY NIGHT...Southeast winds 10 to 15 knots. Seas 2 to 4 feet. A chance of thunderstorms. A chance of showers in the evening, then showers likely after midnight. .FRIDAY...South winds 10 to 15 knots. Seas 2 to 4 feet. Showers with a chance of thunderstorms. .FRIDAY NIGHT...Southeast winds around 10 knots. Seas 2 to 4 feet. Showers likely with a chance of thunderstorms. Winds and seas higher in and near thunderstorms. $$ GMZ370-375-190015- Waters from Freeport to Matagorda Ship Channel TX from 20 to 60 NM-Waters from High Island to Freeport TX from 20 to 60 NM- 643 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH TUESDAY MORNING... .TODAY...Southeast winds around 20 knots with gusts up to 25 knots. Seas 6 to 8 feet, occasionally to 10 feet. Wave Detail: Southeast 7 feet at 7 seconds. .TONIGHT...Southeast winds 15 to 20 knots with gusts up to 25 knots. Seas 6 to 8 feet, occasionally to 10 feet. Wave Detail: Southeast 6 feet at 7 seconds. .TUESDAY...Southeast winds 15 to 20 knots with gusts up to 25 knots. Seas 5 to 7 feet, occasionally to 9 feet. Wave Detail: Southeast 6 feet at 8 seconds. .TUESDAY NIGHT...Southeast winds 10 to 15 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: Southeast 5 feet at 7 seconds. A chance of showers after midnight. .WEDNESDAY...Southeast winds 10 to 15 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: Southeast 5 feet at 8 seconds. .WEDNESDAY NIGHT...Southeast winds around 10 knots. Seas around 4 feet. Wave Detail: Southeast 4 feet at 7 seconds. .THURSDAY...Southeast winds around 10 knots. Seas 3 to 4 feet. A chance of showers. .THURSDAY NIGHT...Southeast winds around 10 knots. Seas 3 to 4 feet. A chance of showers and thunderstorms. .FRIDAY...South winds 10 to 15 knots. Seas 3 to 4 feet. Showers likely with a chance of thunderstorms in the morning, then showers likely in the afternoon. .FRIDAY NIGHT...Southeast winds 10 to 15 knots. Seas 3 to 4 feet. A chance of showers in the evening, then showers likely with a chance of thunderstorms after midnight. Winds and seas higher in and near thunderstorms. $$