Southwest Pass of the Mississippi River to Port Fourchon, LA 20 - 60 NM Marine Forecast
| Rest Of Tonight...Southeast Winds 5 To 10 Knots. Seas 2 To 3 Feet. Wave Detail: East 3 Feet At 5 Seconds. A Chance Of Showers And Thunderstorms. |
| Thursday...Southwest Winds 5 To 10 Knots. Seas Around 2 Feet. Wave Detail: Northeast 2 Feet At 5 Seconds. A Chance Of Showers And Thunderstorms. |
| Thursday Night...Southwest Winds 5 To 10 Knots. Seas Around 2 Feet. Wave Detail: East 2 Feet At 5 Seconds And Southwest 1 Foot At 4 Seconds. A Slight Chance Of Showers In The Evening, Then A Chance Of Showers And Thunderstorms After Midnight. |
| Friday...Southwest Winds 5 To 10 Knots. Seas Around 2 Feet In The Morning, Then 1 Foot Or Less. Wave Detail: Southwest 1 Foot At 3 Seconds And Southeast 1 Foot At 4 Seconds, Becoming South 1 Foot At 4 Seconds. A Chance Of Showers And Thunderstorms. |
| Friday Night...South Winds 5 To 10 Knots. Seas 1 Foot Or Less, Then Around 2 Feet After Midnight. Wave Detail: South 1 Foot At 3 Seconds. A Chance Of Showers. A Slight Chance Of Thunderstorms After Midnight. |
| Saturday...South Winds 5 To 10 Knots. Seas Around 2 Feet In The Morning, Then 1 Foot Or Less. Wave Detail: South 1 Foot At 4 Seconds. A Chance Of Showers And Thunderstorms. |
| Saturday Night...Southeast Winds 5 To 10 Knots. Seas Around 2 Feet. Wave Detail: South 2 Feet At 4 Seconds. A Slight Chance Of Showers And Thunderstorms After Midnight. |
| Sunday...Southeast Winds Around 5 Knots. Seas Around 2 Feet. Wave Detail: Southeast 2 Feet At 5 Seconds. A Chance Of Showers And Thunderstorms, Mainly In The Morning. |
| Sunday Night...Southeast Winds 5 To 10 Knots. Seas Around 2 Feet. Wave Detail: Southeast 2 Feet At 5 Seconds. |
| Monday...Southeast Winds Around 5 Knots. Seas Around 2 Feet. Wave Detail: Southeast 2 Feet At 5 Seconds. A Chance Of Showers And Thunderstorms. |
| Monday Night...Southeast Winds 5 To 10 Knots. Seas Around 2 Feet. A Slight Chance Of Showers And Thunderstorms After Midnight. Winds And Seas Higher In And Near Thunderstorms. |
| Area Forecast Discussion National Weather Service New Orleans LA 102am CDT Thu September 10 2026 .SHORT TERM... (Now through Sunday) Issued at 1232am CDT Thu September 10 2026 A more unsettled weather pattern will take hold of the region today and continue through the weekend. This pattern will be driven by the development a broad, but fairly weak, mid to upper level trough axis across the Lower Mississippi Valley and Gulf South today and into tomorrow. The trough will linger over the area through the weekend before shifting out of the area early next week. Weak forcing aloft will combine with ample moisture as noted by PWATs (Precipitable Waters) ranging from the 90th percentile to the daily max for this time of year, or well over 2 inches, and sufficient instability to produce multiple rounds of showers and thunderstorms through the weekend. Given the warm airmass aloft and deep tropical moisture in place, efficient rainfall processes will support higher rainfall rates of 2 to 4 inches per hour with any stronger storms that form. Storm motions will average 5 knots today, and this will lead to increased flooding risk, especially in low lying and poorly drained areas. Thus, a level 1 out of 5, or marginal risk, of flooding rainfall is in place for today across most of the region. On Friday and Saturday, storm motion will increase slightly to around 10 knots, but localized flooding will still be a concern if any training of storms over the same region occurs. Although PWATs (Precipitable Waters) will begin to decline slightly on Sunday, storm motion will also drop back to around 5 knots and localized flooding will remain a risk. Model soundings are not supportive of any severe storms developing due to a lack of sufficient shear and the warm air aloft limiting hail development. Temperatures will also be near or even slightly below average through the weekend with highs in the upper 80s and lower 90s and heat index values peaking out near 105. Long Term (Sunday night through Wednesday) Issued at 1232am CDT Thu September 10 2026 By Monday, upper level high pressure has moved into the area from the east and taken a firm hold over the southern US. This will bring us back to the summer pattern of afternoon temperatures in the low to mid 90s and 30-50% Probability of Precipitation in the afternoons. These highs temps are about 5 degrees above normal for the end of summer and combined with the humidity will put heat index values in the 105-110 range, so at this point in time I have to mention the possibility of heat headlines. The good news about the rain is it helps put a bit of a damper on the temperature rise Marine Issued at 1232am CDT Thu September 10 2026 A weak area of low pressure will move through the waters today with light and variable winds of less than 10 knots expected. As the low shifts to the west tomorrow, winds will turn more south- southwesterly at 10 to 15 knots. These conditions will persist into Saturday. High pressure centered over the eastern Gulf and southeastern United States will become more dominant as we move into next week, and this will cause winds to turn more south- southeasterly at 5 to 10 knots from Sunday onward. Seas will generally remain in the 1 to 3 feet range with the highest seas well offshore. Additionally, thunderstorm activity will develop each day, peaking in the early to mid-morning hours, and these storms will produce higher wind gusts, waterspouts, and lightning concerns. NOAA New Orleans LA Office: Watches - Warnings - Advisories LA...None. GM...None. MS...None. GM...None. |
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