Chart / Forecasts

Coastal Waters from Port Fourchon LA to Lower Atchafalaya River LA out 20 nm

GMZ551 · Coastal Waters Forecast · National Weather Service New Orleans LA · Issued 248 PM CDT Sat Oct 3 2026
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Forecast
This Afternoon
Southeast winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Southeast 4 feet at 7 seconds. Showers with a chance of thunderstorms.
Tonight
Southeast winds 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Southeast 4 feet at 7 seconds. Showers with a chance of thunderstorms.
Sunday
East winds 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Southeast 3 feet at 8 seconds. Showers with a chance of thunderstorms.
Sunday Night
Northeast winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 7 seconds and northeast 2 feet at 3 seconds. A chance of showers. A chance of thunderstorms, mainly in the evening.
Monday
Northeast winds 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: Northeast 2 feet at 4 seconds and southeast 2 feet at 7 seconds. Showers likely with a slight chance of thunderstorms.
Monday Night
Northeast winds 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: Northeast 3 feet at 4 seconds and southeast 2 feet at 7 seconds. A slight chance of thunderstorms. Showers.
Tuesday
Northeast winds 10 to 15 knots. Seas 2 to 3 feet. Wave Detail: Northeast 3 feet at 4 seconds and southeast 1 foot at 6 seconds. Showers with a chance of thunderstorms.
Tuesday Night
Northeast winds 15 to 20 knots, diminishing to 10 to 15 knots after midnight. Seas 2 to 3 feet. Wave Detail: East 3 feet at 5 seconds. A chance of thunderstorms. Showers likely.
Wednesday
Northeast winds 15 to 20 knots, increasing to 20 to 25 knots in the afternoon. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 6 seconds. A chance of thunderstorms. Showers likely.
Wednesday Night
Northeast winds 25 to 30 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: East 6 feet at 7 seconds. A chance of showers and thunderstorms. Winds and seas higher in and near thunderstorms.
Synopsis
A tightening pressure gradient over the coastal waters will form in response to a developing low pressure system in the western Gulf. This will allow southeast winds to remain elevated near 15 knots with higher gusts today. Very choppy seas of 4 to 6 feet will accompany these winds in the open Gulf waters. The lakes and sounds will see slightly lower winds closer to 10 knots and choppy conditions. Winds will briefly relax to 10 knots or less on Sunday as a front stalls along the coast. This front is expected to then slowly push through the waters on Monday and Tuesday. Winds will turn northeasterly behind the front and increase back to 15 to 20 knots as cooler and drier air advects over the warm waters. Another low will form along the front by Wednesday, and this should increase winds in small craft advisory range of 20 to 25 knots through the end of the week. Seas will also increase to 5 to 7 feet by Wednesday and remain at those levels through the end of the week.
Source: National Weather Service Coastal Waters Forecast (CWF), issued 248 PM CDT Sat Oct 3 2026, valid until Sun, 04 Oct 2026 08:00 UTC. Original text · All zones