Southwest Pass of the Mississippi River to Port Fourchon Louisiana Marine Forecast
| This Afternoon...Northeast Winds 5 To 10 Knots. Seas 1 To 2 Feet. Wave Detail: Northeast 1 Foot At 3 Seconds. |
| Tonight...Southeast Winds 5 To 10 Knots, Becoming Northwest After Midnight. Seas 1 Foot Or Less. Wave Detail: East 1 Foot At 4 Seconds. |
| Wednesday...North Winds Around 5 Knots, Becoming East In The Afternoon. Seas 1 Foot Or Less. Wave Detail: Northwest 1 Foot At 2 Seconds And East 1 Foot At 4 Seconds. |
| Wednesday Night...East Winds 5 To 10 Knots. Seas 1 Foot Or Less, Then 1 To 2 Feet After Midnight. Wave Detail: East 1 Foot At 4 Seconds, Becoming East 1 Foot At 3 Seconds. A Slight Chance Of Thunderstorms. A Slight Chance Of Showers In The Evening, Then A Chance Of Showers After Midnight. |
| Thursday...Northeast Winds 10 To 15 Knots, Becoming East 15 To 20 Knots In The Afternoon. Seas 2 To 4 Feet, Occasionally To 5 Feet. Wave Detail: East 3 Feet At 4 Seconds. A Chance Of Showers With A Slight Chance Of Thunderstorms In The Morning, Then Showers Likely With A Chance Of Thunderstorms In The Afternoon. |
| Thursday Night...East Winds 20 To 25 Knots. Seas 3 To 5 Feet, Occasionally To 6 Feet. Wave Detail: East 5 Feet At 5 Seconds. A Chance Of Thunderstorms. Showers Likely, Mainly In The Evening. |
| Friday...East Winds 20 To 25 Knots. Seas 3 To 5 Feet, Occasionally To 6 Feet. Wave Detail: East 5 Feet At 6 Seconds. Showers Likely With A Chance Of Thunderstorms. |
| Friday Night...East Winds 20 To 25 Knots. Seas 3 To 5 Feet, Occasionally To 6 Feet. Wave Detail: East 5 Feet At 6 Seconds. A Chance Of Thunderstorms. Showers Likely. |
| Saturday...East Winds 20 To 25 Knots. Seas 3 To 5 Feet, Occasionally To 6 Feet. Wave Detail: East 5 Feet At 6 Seconds. Showers With A Chance Of Thunderstorms. |
| Saturday Night...East Winds 20 To 25 Knots. Seas 3 To 5 Feet, Occasionally To 6 Feet. Wave Detail: East 5 Feet At 6 Seconds. Showers Likely With A Chance Of Thunderstorms. Winds And Seas Higher In And Near Thunderstorms. |
| Area Forecast Discussion National Weather Service New Orleans LA 1142pm CDT Monday September 29 2025 .SHORT TERM... (Tonight through Wednesday night) Issued at 1142pm CDT Monday September 29 2025 Overall, the synoptic pattern is rather weak today with only slight upper level ridging over the CWFA. The area resides in a slight weakness between a developing ridge over the northern MS River Valley and a weak ridge over the western Gulf. That said, thicknesses and heigheights are elevated a bit, which will again prove to provide a source for strong surface warming. Like the last few days, strong surface heating will cause dewpoints to mix downward this afternoon, however, as we seen this afternoon behind the sea/lake breeze, the dewpoints rebounded right before sunset making it feel a bit more humid. That said, going into this afternoon and Wednesday there is just enough low level moisture associated with these mesoscale boundaries where a nonzero shower potential may be possible. For now left any mention of precipitation out because we need just enough moisture return to have at least a silent 10 out there. Wednesday looks to be a bit better with easterly or just slightly south of due easterly flow tries to develop help gradually increase low level moisture quality right along the immediate coast. (Frye) Long Term (Thursday through Monday night) Issued at 1142pm CDT Monday September 29 2025 Going into the long term the synoptic pattern wakes up a bit, if you will. An upper level weakness extending westward cross the western Atlantic and into the north central Gulf will begin to close off into an upper level low by the start of the long term period. At the surface, a bit stronger easterly flow begins to develop over the region. From this point rain chances south of I10/12 start to rise little by little with some modest low level moisture doing what it can to move back into the region from the east. The upper level low parks itself over the southeast going into the upcoming weekend. At the surface a weak stalled frontal boundary will reside over the central Gulf Coast. Temperatures later this week will likely cool a bit to around average or perhaps just a skosh below? Lower to middle 80s will be possible. However, overnight lows no change - still around average. The cooler daytime highs can mostly be contributed to the upper level low (cold core...which will mean something in just a moment as we get further into the weekend). Additionally, the cloudiness and some rainfall will also do it's part in keeping the region a bit cooler than we have seen earlier in the week and last weekend. Further, the GFS (Global Forecast System) is trying to develop some surface feature over our waters. While simply looking at the pressure field it could seem a bit more intimidating. However, taking a look at H200 the region will be under a cold core upper level low meaning it likely will NOT be a tropical entity. Maybe a hybrid if anything even forms at all. The other globals have an inverted trough and residual troughing along the weak stalled front, however, at this juncture the GFS is the outlier. Even the ensembles aren't exactly happy with the operational GFS runs as of late. Regardless, the feature is absorbed by the more dominate upper level low on Sunday. Needless to say, low confidence, but there certainly could be some rain and storms around. Again, as the cold core low sits up over our region there will be a need to pay attention to the updraft strength because the signal for small hail at least will be there. (Frye) Marine Issued at 1142pm CDT Monday September 29 2025 Generally offshore flow will continue across the local waters through midweek or so. Convection and rain chances will gradually increase from midweek through the end of the forecast period. Moderate easterly flow develops by Thursday and will likely continue and perhaps even further strengthen through the weekend. Small Craft Advisories for both winds and seas are looking increasingly likely by late this week and into the weekend. Additionally, expect a bit higher seas and winds in and around convection. (Frye) NOAA New Orleans LA Office: Watches - Warnings - Advisories LA...None. GM...None. MS...None. GM...None. |
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