GMZ400-210900-
309 PM CDT Mon Jul 20 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...
High pressure over the western Gulf will drive westerly winds around
10-15 knots today, with winds increasing from east to west starting
tonight as Tropical Depression Two approaches the area. Look for
winds to increase to the 20-25 kt range by Wednesday over our
eastern waters. Tropical storm conditions will be possible at times
Wednesday night through Friday as the system passes along the
coastline.
$$
GMZ470-210900- Coastal waters from Cameron LA to High Island TX from 20 to 60 NM- 309 PM CDT Mon Jul 20 2026 TONIGHT West winds 10 to 15 knots. Seas around 2 feet. Wave Detail: West 2 feet at 4 seconds. TUESDAY West winds 10 to 15 knots with gusts up to 20 knots. Seas 2 to 3 feet. Wave Detail: West 3 feet at 4 seconds. TUESDAY NIGHT West winds 10 to 15 knots with gusts up to 25 knots. Seas 2 to 4 feet. Wave Detail: Southwest 3 feet at 4 seconds. WEDNESDAY West winds around 15 knots with gusts up to 25 knots. Seas 3 to 4 feet. Wave Detail: West 4 feet at 5 seconds. A slight chance of showers and thunderstorms. WEDNESDAY NIGHT West winds around 15 knots with gusts up to 25 knots. Seas around 3 feet. Wave Detail: Southwest 3 feet at 5 seconds. A chance of showers. A slight chance of thunderstorms in the evening, then a chance of thunderstorms after midnight. THURSDAY West winds around 15 knots, increasing to 20 to 25 knots in the afternoon. Seas 3 to 4 feet. Wave Detail: West 4 feet at 5 seconds. A chance of showers and thunderstorms, mainly in the morning. THURSDAY NIGHT Southwest winds 15 to 20 knots with gusts up to 50 knots. Seas 3 to 4 feet. A slight chance of showers and thunderstorms. FRIDAY Southwest winds 20 to 25 knots, diminishing to 15 to 20 knots in the afternoon. Seas 3 to 5 feet, occasionally to 6 feet. A slight chance of showers and thunderstorms. FRIDAY NIGHT South winds 15 to 20 knots, diminishing to around 10 knots after midnight. Seas 2 to 4 feet. SATURDAY Southwest winds 5 to 10 knots. Seas around 2 feet. A slight chance of showers and thunderstorms in the morning. SATURDAY NIGHT South winds 5 to 10 knots. Seas around 2 feet. Winds and seas higher in and near thunderstorms. $$
GMZ470-210900- Coastal waters from Cameron LA to High Island TX from 20 to 60 NM- 309 PM CDT Mon Jul 20 2026 TONIGHT West winds 10 to 15 knots. Seas around 2 feet. Wave Detail: West 2 feet at 4 seconds. TUESDAY West winds 10 to 15 knots with gusts up to 20 knots. Seas 2 to 3 feet. Wave Detail: West 3 feet at 4 seconds. TUESDAY NIGHT West winds 10 to 15 knots with gusts up to 25 knots. Seas 2 to 4 feet. Wave Detail: Southwest 3 feet at 4 seconds. WEDNESDAY West winds around 15 knots with gusts up to 25 knots. Seas 3 to 4 feet. Wave Detail: West 4 feet at 5 seconds. A slight chance of showers and thunderstorms. WEDNESDAY NIGHT West winds around 15 knots with gusts up to 25 knots. Seas around 3 feet. Wave Detail: Southwest 3 feet at 5 seconds. A chance of showers. A slight chance of thunderstorms in the evening, then a chance of thunderstorms after midnight. THURSDAY West winds around 15 knots, increasing to 20 to 25 knots in the afternoon. Seas 3 to 4 feet. Wave Detail: West 4 feet at 5 seconds. A chance of showers and thunderstorms, mainly in the morning. THURSDAY NIGHT Southwest winds 15 to 20 knots with gusts up to 50 knots. Seas 3 to 4 feet. A slight chance of showers and thunderstorms. FRIDAY Southwest winds 20 to 25 knots, diminishing to 15 to 20 knots in the afternoon. Seas 3 to 5 feet, occasionally to 6 feet. A slight chance of showers and thunderstorms. FRIDAY NIGHT South winds 15 to 20 knots, diminishing to around 10 knots after midnight. Seas 2 to 4 feet. SATURDAY Southwest winds 5 to 10 knots. Seas around 2 feet. A slight chance of showers and thunderstorms in the morning. SATURDAY NIGHT South winds 5 to 10 knots. Seas around 2 feet. Winds and seas higher in and near thunderstorms. $$