Coastal Waters Forecast for Coastal Waters from Port Fourchon LA to Lower Atchafalaya River LA out 20 nm (GMZ551) (Text-Only)
NWS Forecast for: Coastal Waters from Port Fourchon LA to Lower Atchafalaya River LA out 20 nm (GMZ551)
Issued by: National Weather Service New Orleans/Baton Rouge, LA
Last Update: 537 AM CDT Sat Sep 5 2026


Today: West winds around 5 knots. Seas 1 foot or less. Wave detail: southwest 1 foot at 2 seconds. A chance of showers and thunderstorms until late afternoon, then a slight chance of showers and thunderstorms late.

Tonight: Southwest winds around 5 knots. Seas 1 foot or less.

Sunday: West winds around 5 knots. Seas 1 foot or less. Wave detail: west 1 foot at 2 seconds. A slight chance of showers and thunderstorms in the morning.

Sunday Night: West winds 5 to 10 knots. Seas 1 foot or less. Wave detail: west 1 foot at 2 seconds. A chance of showers and thunderstorms after midnight.

Monday: Northwest winds 5 to 10 knots, becoming west in the afternoon. Seas 1 foot or less. Wave detail: northwest 1 foot at 2 seconds. A chance of showers and thunderstorms.

Monday Night: Southwest winds around 5 knots. Seas 1 foot or less. Wave detail: west 1 foot at 2 seconds. A chance of showers and thunderstorms after midnight.

Tuesday: Northwest winds around 5 knots, becoming southeast in the afternoon. Seas 1 foot or less. Wave detail: south 1 foot at 3 seconds. Showers likely with a chance of thunderstorms.

Tuesday Night: Southeast winds 5 to 10 knots. Seas 1 foot or less. Wave detail: southeast 1 foot at 3 seconds. A slight chance of showers and thunderstorms in the evening, then a chance of showers and thunderstorms after midnight.

Wednesday: East winds around 5 knots. Seas 1 foot or less. Wave detail: southeast 1 foot at 3 seconds. A chance of thunderstorms. Showers likely, mainly in the morning.

Wednesday Night: Southeast winds around 5 knots. Seas 1 foot or less. Wave detail: east 1 foot at 3 seconds. A chance of showers and thunderstorms after midnight.

winds and seas higher in and near thunderstorms.







Zone Forecast: Coastal Waters from Port Fourchon LA to Lower Atchafalaya River LA out 20 nm (GMZ551)

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