20NM SSE Grand Isle LA

Northwest winds 10 to 15 knots. Seas 2 to 3 feet. Wave detail: northwest 3 feet at 4 seconds and east 1 foot at 5 seconds. A slight chance of showers and thunderstorms.

Northwest winds 15 to 20 knots, increasing to 20 to 25 knots with gusts up to 30 knots in the afternoon. Seas 3 to 5 feet, occasionally to 6 feet. Wave detail: west 5 feet at 5 seconds and east 1 foot at 7 seconds. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms early in the afternoon. Showers and thunderstorms likely late.

Tropical storm conditions possible. West winds 30 to 40 knots with gusts up to 50 knots. Seas 5 to 8 feet, occasionally to 10 feet, building to 7 to 10 feet, occasionally to 13 feet in the afternoon. Wave detail: southwest 10 feet at 8 seconds. Showers. Thunderstorms likely until late afternoon, then a chance of thunderstorms late.

Southwest winds 25 to 30 knots, diminishing to 15 to 20 knots in the afternoon. Seas 6 to 9 feet, occasionally to 11 feet, subsiding to 4 to 6 feet, occasionally to 8 feet in the afternoon. Wave detail: southwest 9 feet at 8 seconds. A chance of showers and thunderstorms.

Southwest winds 5 to 10 knots. Seas around 2 feet. Wave detail: south 2 feet at 5 seconds. A chance of showers and thunderstorms until late afternoon, then a slight chance of showers and thunderstorms late.