FZUS54 KBRO 180648 CWFBRO Coastal Waters Forecast for the Lower Texas Coast National Weather Service Brownsville TX 148 AM CDT Mon May 18 2026 Lower Texas coastal waters from Baffin Bay to the mouth of the Rio Grande out 60 NM. 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. GMZ100-181915- 148 AM CDT Mon May 18 2026 .SYNOPSIS...An enhanced pressure gradient will maintain unfavorable marine conditions with moderate to fresh southeasterly winds, moderate seas, and choppy bay conditions through much of the week. Low to medium (30 to 60 percent) rain chances return Tuesday night, lasting through the week. $$ GMZ130-132-135-181915- Laguna Madre from the Port of Brownsville to the Arroyo Colorado- Laguna Madre from the Arroyo Colorado To 5 NM north of Port Mansfield TX- Laguna Madre from 5 nm north of Port Mansfield to Baffin Bay TX- 148 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH TUESDAY MORNING... .TODAY...Southeast winds 15 to 20 knots. Gusts to 30 knots late this afternoon. Choppy on the bay. A slight chance of showers this morning. .TONIGHT...Southeast winds 15 to 20 knots. Choppy on the bay. A slight chance of showers and thunderstorms in the late evening and overnight. .TUESDAY...Southeast winds around 15 knots. A moderate chop on the bay. A slight chance of showers. A slight chance of thunderstorms in the afternoon. .TUESDAY NIGHT...Southeast winds 10 to 15 knots. A moderate chop on the bay. A chance of showers with a slight chance of thunderstorms after midnight. .WEDNESDAY...Southeast winds 10 to 15 knots. A moderate chop on the bay. A chance of showers early in the morning. .WEDNESDAY NIGHT...Southeast winds 10 to 15 knots. A moderate chop on the bay. .THURSDAY...Southeast winds 5 to 10 knots, increasing to 10 to 15 knots in the afternoon. A moderate chop on the bay. A slight chance of thunderstorms until late afternoon. A chance of showers. .THURSDAY NIGHT...Southeast winds 10 to 15 knots, diminishing to 5 to 10 knots after midnight. A moderate chop on the bay, diminishing to light chop after midnight. A chance of showers in the evening. A slight chance of thunderstorms late in the evening, then showers likely with a chance of thunderstorms after midnight. .FRIDAY...South winds 5 to 10 knots, becoming southeast 10 to 15 knots in the afternoon. A moderate chop on the bay. A chance of thunderstorms. Showers likely. .FRIDAY NIGHT...Southeast winds 10 to 15 knots, diminishing to 5 to 10 knots in the late evening and overnight. A moderate chop on the bay, diminishing to light chop in the late evening and overnight. A chance of showers. A chance of thunderstorms early in the evening, then a slight chance of thunderstorms in the late evening and overnight. Winds and waves higher in and near thunderstorms. $$ GMZ150-155-181915- Gulf waters from Port Mansfield to the Rio Grande out 20 nm- Gulf waters from Baffin Bay to Port Mansfield out 20 nm- 148 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH TUESDAY MORNING... .TODAY...Southeast winds 15 to 20 knots. Seas 5 to 7 feet, occasionally to 9 feet. Wave Detail: Southeast 6 feet at 8 seconds. A slight chance of showers this morning. .TONIGHT...Southeast winds 15 to 20 knots. Seas 5 to 7 feet, occasionally to 9 feet. Wave Detail: Southeast 6 feet at 8 seconds. A slight chance of showers and thunderstorms after midnight. A slight chance of showers early in the morning. .TUESDAY...Southeast winds 10 to 15 knots. Seas 5 to 7 feet, occasionally to 9 feet, subsiding to 4 to 5 feet in the afternoon. Wave Detail: Southeast 6 feet at 8 seconds, becoming southeast 5 feet at 8 seconds. A slight chance of showers late in the afternoon. .TUESDAY NIGHT...Southeast winds 10 to 15 knots. Seas 4 to 5 feet. Wave Detail: Southeast 5 feet at 8 seconds. A chance of showers with a slight chance of thunderstorms after midnight. .WEDNESDAY...Southeast winds 10 to 15 knots. Seas 4 to 5 feet. Wave Detail: Southeast 5 feet at 8 seconds. A chance of showers with a slight chance of thunderstorms early in the morning. .WEDNESDAY NIGHT...Southeast winds around 10 knots. Seas 3 to 4 feet. Wave Detail: East 4 feet at 7 seconds. .THURSDAY...Southeast winds 10 to 15 knots. Seas 3 to 4 feet. A slight chance of thunderstorms until late afternoon. A slight chance of showers. .THURSDAY 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. .FRIDAY...Southeast winds 10 to 15 knots. Seas 3 to 4 feet. A chance of thunderstorms. Showers likely, mainly in the morning. .FRIDAY NIGHT...Southeast winds 10 to 15 knots. Seas 3 to 4 feet. A chance of showers. Winds and seas higher in and near thunderstorms. $$ GMZ170-175-181915- Gulf waters from Port Mansfield to the Rio Grande extending from 20 to 60 nm- Gulf waters from Baffin Bay to Port Mansfield extending from 20 to 60 nm- 148 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH TUESDAY MORNING... .TODAY...Southeast winds 15 to 20 knots. Seas 6 to 8 feet, occasionally to 10 feet. Wave Detail: Southeast 7 feet at 8 seconds. .TONIGHT...Southeast winds 15 to 20 knots. Seas 6 to 8 feet, occasionally to 10 feet. Wave Detail: Southeast 7 feet at 8 seconds. .TUESDAY...Southeast winds 10 to 15 knots. Seas 5 to 7 feet, occasionally to 9 feet. Wave Detail: Southeast 6 feet at 8 seconds. .TUESDAY NIGHT...Southeast winds 10 to 15 knots. Seas 5 to 7 feet, occasionally to 9 feet. Wave Detail: Southeast 6 feet at 8 seconds. A slight chance of showers and thunderstorms after midnight. .WEDNESDAY...Southeast winds 10 to 15 knots. Seas 5 to 7 feet, occasionally to 9 feet, subsiding to 4 to 5 feet in the afternoon. Wave Detail: Southeast 5 feet at 8 seconds. A slight chance of showers early in the morning. .WEDNESDAY NIGHT...Southeast winds 10 to 15 knots. Seas 4 to 5 feet. Wave Detail: Southeast 4 feet at 7 seconds. .THURSDAY...Southeast winds 10 to 15 knots. Seas 4 to 5 feet. A slight chance of showers until late afternoon. A slight chance of thunderstorms late in the morning. A chance of showers late in the afternoon. .THURSDAY NIGHT...Southeast winds 10 to 15 knots. Seas 3 to 5 feet. A slight chance of showers in the evening, then a chance of showers with a slight chance of thunderstorms after midnight. .FRIDAY...Southeast winds 10 to 15 knots. Seas 3 to 4 feet. A chance of showers with a slight chance of thunderstorms. .FRIDAY NIGHT...Southeast winds around 10 knots. Seas 3 to 4 feet. A chance of showers with a slight chance of thunderstorms. Winds and seas higher in and near thunderstorms. $$