FZUS54 KLCH 180810 CWFLCH Coastal Waters Forecast National Weather Service Lake Charles LA 309 AM CDT Mon May 18 2026 Coastal waters from the Lower Atchafalaya River LA to High Island TX out 60 nautical miles including Sabine and Calcasieu Lakes and Vermilion and Cote Blanche Bays Seas are provided as a range of the average height of the highest one third of the waves, along with the occasional height of the average highest ten percent of the waves. GMZ400-182100- 309 AM CDT Mon May 18 2026 .Synopsis for Lower Atchafalaya River LA to High Island TX out 60 NM including Sabine and Calcasieu Lakes and Vermilion and Cote Blanche Bays... Tightened pressure gradient will remain in place through at least Tuesday morning. A boundary of disturbed weather is expected to near the region on Tuesday causing all remaining high pressure influence to back eastward. This decrease in pressure will loosen the gradient allowing winds and then seas to fall back on Tuesday, remaining low through the remainder of the week. Rain chances increase Tuesday night and will remain elevated through the rest of the forecast as a series of disturbances cross the region. Winds will prevail somewhat low and onshore, however volatile winds and seas could be possible local to storms each day. $$ GMZ430-182100- Sabine Lake- 309 AM CDT Mon May 18 2026 ...SMALL CRAFT EXERCISE CAUTION IN EFFECT THROUGH LATE TONIGHT... .TODAY...Southeast winds 10 to 15 knots with gusts up to 25 knots. Lake waters choppy. A chance of showers and thunderstorms this afternoon. .TONIGHT...Southeast winds 10 to 15 knots with gusts up to 20 knots. Lake waters choppy. A slight chance of showers and thunderstorms in the evening. .TUESDAY...Southeast winds 10 to 15 knots. Lake waters choppy. A slight chance of showers and thunderstorms in the afternoon. .TUESDAY NIGHT...Southeast winds 10 to 15 knots, diminishing to 5 to 10 knots after midnight. Lake waters choppy. A chance of showers. .WEDNESDAY...Southeast winds 5 to 10 knots. Lake waters light chop. A chance of showers with a slight chance of thunderstorms in the morning, then showers likely with a chance of thunderstorms in the afternoon. .WEDNESDAY NIGHT...Southeast winds 5 to 10 knots. Lake waters light chop. A chance of showers. A chance of thunderstorms, mainly in the evening. .THURSDAY...Southeast winds 5 to 10 knots. Lake waters light chop. A chance of thunderstorms. A chance of showers in the morning, then showers likely in the afternoon. .THURSDAY NIGHT...South winds 5 to 10 knots. Lake waters light chop. A chance of thunderstorms. A chance of showers. .FRIDAY...South winds 5 to 10 knots. Lake waters light chop. A chance of thunderstorms. Showers. .FRIDAY NIGHT...South winds 5 to 10 knots. Lake waters light chop. A chance of thunderstorms. Showers likely. Winds and waves higher in and near thunderstorms. $$ GMZ432-182100- Calcasieu Lake- 309 AM CDT Mon May 18 2026 ...SMALL CRAFT EXERCISE CAUTION IN EFFECT THROUGH LATE TONIGHT... .TODAY...Southeast winds 10 to 15 knots, increasing to 15 to 20 knots late. Lake waters rough. A chance of showers and thunderstorms this afternoon. .TONIGHT...Southeast winds 10 to 15 knots with gusts up to 25 knots. Lake waters choppy. A chance of showers and thunderstorms in the evening. .TUESDAY...Southeast winds 10 to 15 knots with gusts up to 20 knots. Lake waters choppy. A slight chance of showers and thunderstorms in the afternoon. .TUESDAY NIGHT...Southeast winds 10 to 15 knots with gusts up to 20 knots, diminishing to 5 to 10 knots after midnight. Lake waters choppy. A chance of showers. .WEDNESDAY...Southeast winds 5 to 10 knots. Lake waters light chop. A chance of showers with a slight chance of thunderstorms in the morning, then showers likely with a chance of thunderstorms in the afternoon. .WEDNESDAY NIGHT...Southeast winds 5 to 10 knots. Lake waters light chop. A slight chance of thunderstorms in the evening. A chance of showers. .THURSDAY...Southeast winds 5 to 10 knots. Lake waters light chop. A chance of showers and thunderstorms. .THURSDAY NIGHT...South winds 5 to 10 knots. Lake waters light chop. A chance of showers and thunderstorms. .FRIDAY...South winds 5 to 10 knots. Lake waters light chop. A chance of thunderstorms. Showers. .FRIDAY NIGHT...South winds 5 to 10 knots. Lake waters light chop. A chance of thunderstorms. Showers. Winds and waves higher in and near thunderstorms. $$ GMZ435-182100- Vermilion and West Cote Blanche Bays- 309 AM CDT Mon May 18 2026 ...SMALL CRAFT EXERCISE CAUTION IN EFFECT THROUGH LATE TONIGHT... .TODAY...Southeast winds 10 to 15 knots with gusts up to 25 knots. Bay waters choppy. .TONIGHT...Southeast winds 10 to 15 knots with gusts up to 20 knots. Bay waters choppy. .TUESDAY...Southeast winds 10 to 15 knots. Bay waters choppy. .TUESDAY NIGHT...Southeast winds 10 to 15 knots, diminishing to 5 to 10 knots after midnight. Bay waters choppy. A slight chance of showers in the evening, then a chance of showers after midnight. .WEDNESDAY...Southeast winds 5 to 10 knots. Bay waters light chop. A slight chance of showers and thunderstorms in the morning, then showers likely with a chance of thunderstorms in the afternoon. .WEDNESDAY NIGHT...Southeast winds 5 to 10 knots. Bay waters light chop. A chance of showers. A chance of thunderstorms, mainly in the evening. .THURSDAY...Southeast winds 5 to 10 knots. Bay waters light chop. A chance of showers. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. .THURSDAY NIGHT...South winds 5 to 10 knots. Bay waters light chop. A slight chance of showers and thunderstorms in the evening, then a chance of showers and thunderstorms after midnight. .FRIDAY...South winds 5 to 10 knots, increasing to 10 to 15 knots in the afternoon. Bay waters choppy. A chance of showers with a slight chance of thunderstorms in the morning, then showers likely with a chance of thunderstorms in the afternoon. .FRIDAY NIGHT...South winds 5 to 10 knots. Bay waters light chop. Showers likely with a chance of thunderstorms. Winds and waves higher in and near thunderstorms. $$ GMZ436-182100- Atchafalaya and East Cote Blanche Bays- 309 AM CDT Mon May 18 2026 ...SMALL CRAFT EXERCISE CAUTION IN EFFECT THROUGH LATE TONIGHT... .TODAY...Southeast winds 10 to 15 knots with gusts up to 20 knots. Bay waters choppy. .TONIGHT...Southeast winds 10 to 15 knots with gusts up to 20 knots. Bay waters choppy. .TUESDAY...Southeast winds 10 to 15 knots. Bay waters choppy. .TUESDAY NIGHT...Southeast winds 10 to 15 knots, diminishing to 5 to 10 knots after midnight. Bay waters choppy. A chance of showers. .WEDNESDAY...Southeast winds 5 to 10 knots. Bay waters light chop. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. .WEDNESDAY NIGHT...Southeast winds 5 to 10 knots. Bay waters light chop. A chance of showers with a slight chance of thunderstorms. .THURSDAY...Southeast winds 5 to 10 knots. Bay waters light chop. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. .THURSDAY NIGHT...South winds 5 to 10 knots. Bay waters light chop. A slight chance of showers and thunderstorms in the evening, then a chance of showers and thunderstorms after midnight. .FRIDAY...South winds 5 to 10 knots. Bay waters light chop. A chance of showers. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. .FRIDAY NIGHT...South winds 5 to 10 knots. Bay waters light chop. A chance of showers with a slight chance of thunderstorms in the evening, then showers likely with a chance of thunderstorms after midnight. Winds and waves higher in and near thunderstorms. $$ GMZ450-182100- Coastal waters from Cameron LA to High Island TX out 20 NM- 309 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT... .TODAY...Southeast winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: Southeast 5 feet at 5 seconds. A slight chance of showers. A slight chance of thunderstorms late this morning and afternoon. .TONIGHT...Southeast winds 15 to 20 knots with gusts up to 25 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: Southeast 5 feet at 5 seconds. A slight chance of showers in the evening. .TUESDAY...Southeast winds 15 to 20 knots. Seas 3 to 4 feet. Wave Detail: Southeast 4 feet at 5 seconds. A slight chance of showers and thunderstorms in the afternoon. .TUESDAY NIGHT...Southeast winds 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 4 seconds and southeast 3 feet at 7 seconds. A chance of showers. .WEDNESDAY...Southeast winds 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 7 seconds. A chance of showers. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. .WEDNESDAY NIGHT...Southeast winds around 10 knots. Seas around 2 feet. Wave Detail: Southeast 2 feet at 6 seconds. A chance of showers with a slight chance of thunderstorms. .THURSDAY...Southeast winds 10 to 15 knots. Seas around 2 feet. A chance of showers and thunderstorms. .THURSDAY NIGHT...South winds 10 to 15 knots. Seas around 2 feet. A chance of thunderstorms. A chance of showers. .FRIDAY...South winds 10 to 15 knots. Seas around 2 feet. A chance of thunderstorms. Showers. .FRIDAY NIGHT...South winds 10 to 15 knots. Seas around 2 feet. Showers likely with a chance of thunderstorms. Winds and seas higher in and near thunderstorms. $$ GMZ452-182100- Coastal waters from Intracoastal City to Cameron LA out 20 NM- 309 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT... .TODAY...Southeast winds 15 to 20 knots with gusts up to 25 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: Southeast 5 feet at 5 seconds. A slight chance of showers and thunderstorms this afternoon. .TONIGHT...Southeast winds 15 to 20 knots with gusts up to 25 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: Southeast 5 feet at 5 seconds. .TUESDAY...Southeast winds around 15 knots with gusts up to 20 knots. Seas 2 to 4 feet. Wave Detail: Southeast 4 feet at 5 seconds. .TUESDAY NIGHT...Southeast winds 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 6 seconds. A slight chance of showers in the evening, then a chance of showers after midnight. .WEDNESDAY...Southeast winds around 10 knots. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 7 seconds. A chance of showers. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. .WEDNESDAY NIGHT...Southeast winds 5 to 10 knots. Seas around 2 feet. Wave Detail: Southeast 2 feet at 6 seconds. A chance of showers with a slight chance of thunderstorms. .THURSDAY...Southeast winds 5 to 10 knots, increasing to 10 to 15 knots in the afternoon. Seas around 2 feet. A chance of showers with a slight chance of thunderstorms. .THURSDAY NIGHT...South winds 10 to 15 knots. Seas around 2 feet. A chance of showers. A slight chance of thunderstorms in the evening, then a chance of thunderstorms after midnight. .FRIDAY...South winds 10 to 15 knots. Seas around 2 feet. Showers likely. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. .FRIDAY NIGHT...South winds 10 to 15 knots. Seas around 2 feet. Showers likely. A slight chance of thunderstorms in the evening, then a chance of thunderstorms after midnight. Winds and seas higher in and near thunderstorms. $$ GMZ455-182100- Coastal waters from Lower Atchafalaya River to Intracoastal City LA out 20 NM- 309 AM CDT Mon May 18 2026 ...SMALL CRAFT EXERCISE CAUTION IN EFFECT THROUGH LATE TONIGHT... .TODAY...Southeast winds 15 to 20 knots. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 3 seconds. .TONIGHT...Southeast winds 15 to 20 knots, diminishing to 10 to 15 knots after midnight. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 3 seconds. .TUESDAY...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 3 seconds. .TUESDAY NIGHT...Southeast winds 10 to 15 knots, diminishing to 5 to 10 knots after midnight. Seas around 2 feet. Wave Detail: Southeast 2 feet at 3 seconds. A slight chance of showers. .WEDNESDAY...Southeast winds 5 to 10 knots. Seas around 2 feet. Wave Detail: Southeast 1 foot at 3 seconds. A chance of showers with a slight chance of thunderstorms in the afternoon. .WEDNESDAY NIGHT...Southeast winds 5 to 10 knots. Seas 1 to 2 feet. Wave Detail: Southeast 1 foot at 2 seconds. A chance of showers with a slight chance of thunderstorms. .THURSDAY...Southeast winds 5 to 10 knots. Seas 1 foot or less, then around 2 feet in the afternoon. A slight chance of thunderstorms. A slight chance of showers in the morning, then a chance of showers in the afternoon. .THURSDAY NIGHT...South winds 5 to 10 knots. Seas around 2 feet. A slight chance of showers and thunderstorms in the evening, then a chance of showers and thunderstorms after midnight. .FRIDAY...South winds around 10 knots. Seas around 2 feet. A chance of showers. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. .FRIDAY NIGHT...South winds around 10 knots. Seas around 2 feet. A chance of showers with a slight chance of thunderstorms in the evening, then showers likely with a chance of thunderstorms after midnight. Winds and seas higher in and near thunderstorms. $$ GMZ470-182100- Coastal waters from Cameron LA to High Island TX from 20 to 60 NM- 309 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT... .TODAY...Southeast winds 15 to 20 knots with gusts up to 25 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: Southeast 6 feet at 7 seconds. A slight chance of showers and thunderstorms this afternoon. .TONIGHT...Southeast winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: Southeast 5 feet at 7 seconds. .TUESDAY...Southeast winds 10 to 15 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: Southeast 5 feet at 7 seconds. .TUESDAY NIGHT...Southeast winds 10 to 15 knots. Seas 3 to 4 feet. Wave Detail: Southeast 4 feet at 7 seconds. A slight chance of showers in the evening, then a chance of showers after midnight. .WEDNESDAY...Southeast winds around 10 knots. Seas 3 to 4 feet. Wave Detail: Southeast 4 feet at 7 seconds. A chance of showers with a slight chance of thunderstorms. .WEDNESDAY NIGHT...Southeast winds around 10 knots. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 7 seconds. A slight chance of thunderstorms in the evening. A slight chance of showers. .THURSDAY...Southeast winds around 10 knots. Seas 2 to 3 feet. A chance of showers. A chance of thunderstorms, mainly in the morning. .THURSDAY NIGHT...South winds around 10 knots. Seas 2 to 3 feet. A chance of showers and thunderstorms. .FRIDAY...South winds 10 to 15 knots. Seas 2 to 3 feet. A slight chance of thunderstorms. Showers likely. .FRIDAY NIGHT...South winds 10 to 15 knots. Seas 2 to 3 feet. A chance of thunderstorms. A chance of showers in the evening, then showers likely after midnight. Winds and seas higher in and near thunderstorms. $$ GMZ472-182100- Coastal waters from Intracoastal City to Cameron LA from 20 to 60 NM- 309 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT... .TODAY...Southeast winds 15 to 20 knots with gusts up to 25 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: Southeast 5 feet at 7 seconds. .TONIGHT...Southeast winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: Southeast 5 feet at 7 seconds. .TUESDAY...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: Southeast 5 feet at 7 seconds. .TUESDAY NIGHT...Southeast winds 10 to 15 knots. Seas 3 to 4 feet. Wave Detail: Southeast 4 feet at 7 seconds. A slight chance of showers after midnight. .WEDNESDAY...Southeast winds around 10 knots. Seas 3 to 4 feet. Wave Detail: Southeast 4 feet at 7 seconds. A slight chance of thunderstorms. A slight chance of showers in the morning, then a chance of showers in the afternoon. .WEDNESDAY NIGHT...Southeast winds around 10 knots. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 7 seconds. A slight chance of thunderstorms in the evening. A slight chance of showers. .THURSDAY...Southeast winds 5 to 10 knots. Seas 2 to 3 feet. A chance of showers with a slight chance of thunderstorms. .THURSDAY NIGHT...Southeast winds around 10 knots. Seas 2 to 3 feet. A slight chance of showers and thunderstorms in the evening, then a chance of showers and thunderstorms after midnight. .FRIDAY...South winds 10 to 15 knots. Seas 2 to 3 feet. A chance of showers with a slight chance of thunderstorms. .FRIDAY NIGHT...South winds around 10 knots. Seas 2 to 3 feet. A chance of showers with a slight chance of thunderstorms in the evening, then showers likely with a chance of thunderstorms after midnight. Winds and seas higher in and near thunderstorms. $$ GMZ475-182100- Coastal waters from Lower Atchafalaya River to Intracoastal City LA from 20 to 60 NM- 309 AM CDT Mon May 18 2026 ...SMALL CRAFT EXERCISE CAUTION IN EFFECT THROUGH LATE TONIGHT... .TODAY...Southeast winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: Southeast 5 feet at 6 seconds. .TONIGHT...Southeast winds 15 to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: Southeast 5 feet at 7 seconds. .TUESDAY...Southeast winds around 15 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: Southeast 5 feet at 7 seconds. .TUESDAY NIGHT...Southeast winds 10 to 15 knots. Seas 3 to 4 feet. Wave Detail: Southeast 4 feet at 7 seconds. A slight chance of showers in the evening. .WEDNESDAY...Southeast winds 10 to 15 knots. Seas 3 to 4 feet. Wave Detail: Southeast 4 feet at 7 seconds. A slight chance of showers and thunderstorms in the afternoon. .WEDNESDAY NIGHT...Southeast winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 7 seconds. A slight chance of showers and thunderstorms. .THURSDAY...Southeast winds 5 to 10 knots. Seas 2 to 3 feet. A slight chance of thunderstorms. A slight chance of showers in the morning, then a chance of showers in the afternoon. .THURSDAY NIGHT...Southeast winds around 10 knots. Seas 2 to 3 feet. A slight chance of thunderstorms. A slight chance of showers in the evening, then a chance of showers after midnight. .FRIDAY...South winds 10 to 15 knots. Seas 2 to 3 feet. A slight chance of thunderstorms. A slight chance of showers in the morning, then a chance of showers in the afternoon. .FRIDAY NIGHT...South winds 10 to 15 knots. Seas 2 to 3 feet. A chance of showers with a slight chance of thunderstorms.Winds and seas higher in and near thunderstorms. $$