| NWS Forecast for: Coastal waters from the Southwest Pass of the Mississippi River to Port Fourchon Louisiana out 20 NM (GMZ553) Issued by: National Weather Service New Orleans/Baton Rouge, LA Last Update: 1033 AM CDT Tue Jul 21 2026 | |
Rest Of Today: Northwest winds 10 to 15 knots, increasing to 15 to 20 knots this afternoon. Seas 3 to 5 feet, occasionally to 6 feet. Wave detail: northwest 3 feet at 5 seconds and east 2 feet at 7 seconds. A slight chance of showers and thunderstorms late this morning, then a chance of showers and thunderstorms this afternoon. Tonight: Northwest winds 15 to 20 knots with gusts up to 30 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave detail: northwest 5 feet at 5 seconds and east 1 foot at 7 seconds. Showers and thunderstorms likely, mainly in the evening. Wednesday: Tropical storm conditions expected. Northwest winds 25 to 30 knots, increasing to 30 to 40 knots with gusts up to 50 knots in the afternoon. Seas 4 to 6 feet, occasionally to 8 feet, building to 6 to 9 feet, occasionally to 11 feet in the afternoon. Wave detail: west 9 feet at 6 seconds. A chance of thunderstorms in the morning. Showers. Thunderstorms likely in the afternoon. Wednesday Night: Tropical storm conditions possible. Southwest winds 30 to 40 knots with gusts up to 50 knots. Seas 8 to 11 feet, occasionally to 14 feet. Wave detail: southwest 11 feet at 7 seconds. Thunderstorms likely in the evening. Showers. A chance of thunderstorms after midnight. Thursday: Southwest winds 25 to 30 knots with gusts up to 40 knots, diminishing to 20 to 25 knots in the afternoon. Seas 6 to 9 feet, occasionally to 11 feet, subsiding to 5 to 7 feet, occasionally to 9 feet in the afternoon. Wave detail: south 9 feet at 7 seconds. A chance of thunderstorms. Showers likely, mainly in the morning. Thursday Night: Southwest winds 10 to 15 knots with gusts up to 20 knots, diminishing to 5 to 10 knots after midnight. Seas 3 to 5 feet, occasionally to 6 feet. Wave detail: south 4 feet at 6 seconds. A chance of showers. A chance of thunderstorms early in the evening, then a slight chance of thunderstorms in the late evening and overnight. Friday: Southwest winds 5 to 10 knots. Seas 2 to 3 feet. Wave detail: south 3 feet at 5 seconds. A chance of showers with a slight chance of thunderstorms early in the morning, then a slight chance of showers and thunderstorms in the late morning and early afternoon. Friday Night: Southwest winds 5 to 10 knots. Seas 2 to 3 feet. Wave detail: south 2 feet at 5 seconds. A slight chance of showers and thunderstorms. Saturday: Southwest winds 5 to 10 knots. Seas around 2 feet. Wave detail: south 2 feet at 5 seconds. A slight chance of showers and thunderstorms in the morning. Saturday Night: Southwest winds 5 to 10 knots. Seas around 2 feet. Wave detail: south 2 feet at 5 seconds. winds and seas higher in and near thunderstorms. | |
| Zone Forecast: Coastal waters from the Southwest Pass of the Mississippi River to Port Fourchon Louisiana out 20 NM (GMZ553) | |
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