Coastal Waters Forecast for Coastal Waters from Port Fourchon LA to Lower Atchafalaya River LA out 20 nm (GMZ550) (Text-Only)
NWS Forecast for: Coastal Waters from Port Fourchon LA to Lower Atchafalaya River LA out 20 nm (GMZ550)
Issued by: National Weather Service New Orleans/Baton Rouge, LA
Last Update: 1206 AM CDT Tue Sep 2 2025


Rest Of Tonight: East winds 10 to 15 knots. Seas 2 to 3 feet. Wave detail: east 2 feet at 4 seconds. A chance of thunderstorms. A chance of showers, then showers likely late.

Tuesday: East winds 10 to 15 knots. Seas around 2 feet. Wave detail: east 2 feet at 4 seconds. A chance of thunderstorms. Showers likely, mainly in the morning.

Tuesday Night: East winds 10 to 15 knots, diminishing to 5 to 10 knots after midnight. Seas around 2 feet. Wave detail: east 2 feet at 4 seconds. A chance of showers with a slight chance of thunderstorms.

Wednesday: East winds 5 to 10 knots. Seas 1 to 2 feet. Wave detail: east 2 feet at 4 seconds. A chance of showers and thunderstorms, mainly in the morning.

Wednesday Night: East winds 5 to 10 knots. Seas 1 to 2 feet in the evening, then 1 foot or less. Wave detail: east 1 foot at 4 seconds, becoming southeast 1 foot at 4 seconds. A slight chance of showers and thunderstorms after midnight.

Thursday: Northeast winds around 5 knots. Seas 1 foot or less. Wave detail: east 1 foot at 4 seconds. A slight chance of showers and thunderstorms in the morning.

Thursday Night: South winds around 5 knots. Seas 1 foot or less. Wave detail: southeast 1 foot at 4 seconds.

Friday: Southeast winds around 5 knots. Seas 1 foot or less. Wave detail: southeast 1 foot at 4 seconds.

Friday Night: Southeast winds around 5 knots. Seas 1 foot or less. Wave detail: southeast 1 foot at 3 seconds.

Saturday: Southeast winds around 5 knots. Seas 1 foot or less. Wave detail: southeast 1 foot at 3 seconds. A slight chance of showers and thunderstorms.

Saturday Night: Southeast winds around 5 knots. Seas 1 foot or less. A slight 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 (GMZ550)

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