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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: 437 AM CST Sat Jan 31 2026



Today: North winds 25 to 30 knots with gusts up to 40 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave detail: northwest 6 feet at 5 seconds.

Tonight: North winds 20 to 25 knots with gusts up to 30 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave detail: north 5 feet at 5 seconds.

Sunday: North winds 15 to 20 knots, diminishing to 5 to 10 knots in the afternoon. Seas 1 to 2 feet. Wave detail: northeast 2 feet at 3 seconds.

Sunday Night: Northwest winds 5 to 10 knots. Seas 1 foot or less. Wave detail: northwest 1 foot at 2 seconds.

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.

Monday Night: South winds 5 to 10 knots. Seas 1 foot or less. Wave detail: southwest 1 foot at 2 seconds.

Tuesday: South winds 5 to 10 knots. Seas 1 foot or less, then 1 to 2 feet in the afternoon. Wave detail: south 1 foot at 3 seconds, becoming south 2 feet at 3 seconds.

Tuesday Night: South winds around 10 knots. Seas 2 to 3 feet. Wave detail: south 2 feet at 4 seconds. A chance of showers after midnight.

Wednesday: West winds 10 to 15 knots, becoming northwest in the afternoon. Seas 2 to 3 feet. Wave detail: southwest 3 feet at 4 seconds. Showers likely with a slight chance of thunderstorms.

Wednesday Night: North winds 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave detail: northwest 3 feet at 4 seconds and east 2 feet at 5 seconds. A chance of showers, mainly in the evening.

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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