| 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: 1237 PM CDT Tue Jul 21 2026 |  |
This Afternoon: Northwest winds 15 to 20 knots with gusts up to 25 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave detail: northwest 3 feet at 5 seconds and east 2 feet at 7 seconds. A chance of showers and thunderstorms. 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 expected. 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: Tropical storm conditions possible. Southwest winds 25 to 30 knots with gusts up to 40 knots, diminishing to 20 to 25 knots with gusts up to 30 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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