Lake Pontchartrain and Lake Maurepas Marine Forecast
| Today...Southeast Winds 5 To 10 Knots. Waves 1 Foot Or Less, Then Around 2 Feet This Afternoon. A Slight Chance Of Showers And Thunderstorms This Afternoon. |
| Tonight...South Winds 5 To 10 Knots. Waves Around 2 Feet In The Evening, Then 1 Foot Or Less. |
| Wednesday...Southwest Winds 5 To 10 Knots. Waves 1 Foot Or Less, Then Around 2 Feet In The Afternoon. A Chance Of Showers And Thunderstorms In The Afternoon. |
| Wednesday Night...Southwest Winds 5 To 10 Knots. Waves Around 2 Feet. A Chance Of Showers And Thunderstorms. |
| Thursday...West Winds 5 To 10 Knots. Waves Around 2 Feet. A Chance Of Thunderstorms. A Chance Of Showers In The Morning, Then Showers Likely In The Afternoon. |
| Thursday Night...West Winds 5 To 10 Knots. Waves Around 2 Feet. A Chance Of Showers And Thunderstorms In The Evening, Then A Slight Chance Of Showers After Midnight. |
| Friday...Northwest Winds 5 To 10 Knots. Waves Around 2 Feet In The Morning, Then 1 Foot Or Less. A Slight Chance Of Showers And Thunderstorms In The Afternoon. |
| Friday Night...North Winds 5 To 10 Knots. Waves Around 2 Feet. |
| Saturday...North Winds 5 To 10 Knots. Waves Around 2 Feet In The Morning, Then 1 Foot Or Less. |
| Saturday Night...North Winds 5 To 10 Knots. Waves Around 2 Feet. Winds And Waves Higher In And Near Thunderstorms. |
| Area Forecast Discussion National Weather Service New Orleans LA 1228am CDT Tuesday September 23 2025 .SHORT TERM... (Today through Wednesday) Issued at 1226am CDT Tuesday September 23 2025 Convection quickly dissipated late yesterday afternoon and early evening with the rest of the night quiet. Dewpoints generally remain in the lower to mid 70s and with temps having dropped into the lower to mid 70s across most the area before 5z temps will likely only drop another few degrees. The one location that may see temps continue to fall through the early morning is coastal Ms that was still near 80 at 5z. Forecast for today looks to be drier than yesterday. The weak impulse that led to the convection yesterday is moving through the area and will be east of the CWA (County Warning Area) before sunrise. This places us on the backside with rising hghts. H5 hgheights are expected to rise around 5 dm in 24 hrs from 18/21z yesterday. That will lead to an increase in suppression and hurt convection, likely keeping isolated storms at best this afternoon across northwestern portions of the CWA. It will also lead to at least one more day of lower to mid 90s highs. After today things look to finally become more favorable for rain and slightly cooler temps at the end of the week and into the weekend. /CAB/ Long Term (Wednesday night through Monday) Issued at 1226am CDT Tuesday September 23 2025 Medium range models in fairly decent agreement with the pattern through the rest of the work week and into the weekend. There are some slight differences in the strength of a few features the deeper we get into the forecast but the overall pattern is consistent. Still looks pretty decent that we finally get a good wetting rain for the second half of the work week with a weak cold front moving through. As we move into Wednesday we will see the rain chances climb considerably compared to today. A lead impulse which is currently moving through the 4 corners will cross the southern Plains and into the Lower MS Valley Wednesday. This impulse will help to suppress the ridge that will be building in over the area behind yesterday's weak disturbance. Moisture will also be increasing with PWs climbing above 2". Combine the falling hghts, increasing lift, and increasing moisture and after enough daytime heating we will see scattered convection develop. There may even be numerous storms across the northwestern/northern areas. This is all ahead of the main trough and approaching cold front. A deep closed low will begin to move into the Great LAkes Thursday with the L/W trough axis extending back to the SSE. The trough axis will not move through the CWA completely until late Friday. This also will lead to the weak cold front moving into the CWA Thursday and eventually moving through the area and into the Gulf midday Friday. Ahead of the front moisture will pile up. With the front being rather weak and slow, mid level flow not exactly paralleling it but not helping it to surge south, we could see a some pockets of heavy rain. PWs will be rather high and if they are above 2" as models suggest that would be above the 90th percentile which is a drastic increase from what we have seen the last week plus. Numerous showers and thunderstorms are expected Thursday and a few locations could quickly see a few inches of rain which would be a very welcome sight for most of the area. The front finally moves into the coastal waters Friday. Until then rain will remain likely and until the trough moves through rain will remain at least possible. Slightly cooler air will filter in behind it and drier air will push in Friday night. Depending on how much rain occurs lows should fall into the lower to mid 60s again this weekend. /CAB/ Marine Issued at 1226am CDT Tuesday September 23 2025 Surface high pressure will remain centered just off to the east- northeast of the coastal waters through Wednesday. This will continue to result in benign conditions with generally light southerly winds. An approaching cold front will result in higher rain chances beginning Thursday, with winds and seas becoming more chaotic in the vicinity of storms. As the front moves into the Gulf Friday, high pressure will build in from the northwest resulting in a period of offshore winds through the weekend. Outside of thunderstorms, no marine hazards expected. /CAB/ NOAA New Orleans LA Office: Watches - Warnings - Advisories LA...None. GM...None. MS...None. GM...None. |
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