
Boothville, LA to Southwest Pass of the Mississippi River Marine Forecast
Tonight...East Winds 5 To 10 Knots. Seas 2 To 3 Feet. Wave Detail: Southeast 2 Feet At 5 Seconds. |
Tuesday...East Winds 10 To 15 Knots. Seas Around 2 Feet. Wave Detail: Southeast 2 Feet At 5 Seconds. A Slight Chance Of Showers In The Afternoon. |
Tuesday Night...Southeast Winds 15 To 20 Knots With Gusts Up To 25 Knots. Seas 3 To 5 Feet, Occasionally To 6 Feet. Wave Detail: East 3 Feet At 4 Seconds. Showers Likely With A Slight Chance Of Thunderstorms In The Evening, Then Showers With A Chance Of Thunderstorms After Midnight. |
Wednesday...Northeast Winds 15 To 20 Knots, Becoming North In The Afternoon. Gusts Up To 30 Knots. Seas 4 To 6 Feet, Occasionally To 8 Feet. Wave Detail: Northeast 5 Feet At 5 Seconds And Southeast 4 Feet At 6 Seconds. Showers With A Chance Of Thunderstorms In The Morning, Then A Slight Chance Of Showers In The Afternoon. |
Wednesday Night...North Winds 20 To 25 Knots With Gusts Up To 30 Knots. Seas 4 To 6 Feet, Occasionally To 8 Feet. Wave Detail: Northeast 5 Feet At 6 Seconds And South 3 Feet At 7 Seconds. A Slight Chance Of Showers. |
Thursday...North Winds 20 To 25 Knots, Diminishing To 15 To 20 Knots In The Afternoon. Seas 4 To 6 Feet, Occasionally To 8 Feet. Wave Detail: Northeast 6 Feet At 5 Seconds And South 1 Foot At 7 Seconds. |
Thursday Night...Northeast Winds 15 To 20 Knots With Gusts Up To 30 Knots. Seas 3 To 5 Feet, Occasionally To 6 Feet. Wave Detail: Northeast 5 Feet At 5 Seconds And South 1 Foot At 6 Seconds. |
Friday...Northeast Winds 15 To 20 Knots, Diminishing To 10 To 15 Knots In The Afternoon. Seas 3 To 5 Feet, Occasionally To 6 Feet. Wave Detail: Northeast 5 Feet At 6 Seconds. |
Friday Night...Northeast Winds 10 To 15 Knots. Seas 2 To 4 Feet, Occasionally To 5 Feet. Wave Detail: East 3 Feet At 6 Seconds. A Slight Chance Of Showers After Midnight. |
Saturday...East Winds 10 To 15 Knots. Seas 2 To 3 Feet. Wave Detail: East 3 Feet At 5 Seconds. A Chance Of Showers. |
Saturday Night...East Winds 10 To 15 Knots. Seas 2 To 4 Feet, Occasionally To 5 Feet. A Chance Of Showers. A Slight Chance Of Thunderstorms After Midnight. Winds And Seas Higher In And Near Thunderstorms. |
Area Forecast Discussion National Weather Service New Orleans LA 315pm CST Monday Feb 17 2025 ...New SHORT TERM, LONG TER Marine .KEY MESSAGES... 1 - Marginal threat of excessive rainfall and severe weather overnight Tuesday night into Wednesday morning. Widespread rain amounts of two inches or more are possible across the area, which could cause some runoff issues, especially in urban areas. Main severe weather concern would be hail near quarter size. 2 - A strong cold front will bring widespread freeze conditions to most of the area Wednesday night and again Thursday night. This is likely to include portions of the New Orleans metro area, with potential for hard freeze conditions across SW MS and portions of SE LA near and north of Interstate 12. Wind chill values in the teens and lower 20s are likely across much of the area both Wednesday night and Thursday night. Expectation is that Cold Weather Advisories will be necessary for just about the entire CWA (County Warning Area) both nights. .SHORT TERM... (This evening through Tuesday night) Issued at 300pm CST Monday Feb 17 2025 Upper flow is generally zonal across the southern half of the country this afternoon. At the surface, high pressure extended from the Canadian Prairie Provinces to the lower Mississippi River Valley. Clear skies across the area this afternoon with temperatures generally in the mid and upper 50s. Tonight will remain mostly clear with surface winds gradually coming around to the east. Temperatures may not be quite as cold as this morning, but won't rule out isolated readings near freezing, especially in the Pascagoula River drainage region in Jackson County. Isentropic processes will bring a lowering cloud deck to the area during the daytime hours Tuesday, with light rain potentially reaching the surface prior to sunset Tuesday. With the baroclinic zone likely remaining off the Louisiana coastline Tuesday and Tuesday night, a developing surface wave is likely to move eastward along this zone toward the area Tuesday night. Precipitable water values are expected to increase to the 75th to 90th percentile climatologically (1.25 to 1.6 inches). With the warm, moist air getting advected over the cold airmass, elevated, embedded convection is expected to develop. At this time, it appears that any surface based convection is likely to remain offshore, with the possible exception of lower Plaquemines Parish. That leaves hail (up to an inch in diameter) as a potential concern. Widespread rain amounts of around 2 inches can be expected from Tuesday evening into Wednesday morning, with a few spot totals in excess of 3 inches. Could be some isolated runoff issues, especially in urban areas, but most areas have seen an inch or less of rain over the last couple weeks. At this time, a Flood Watch is not anticipated. High temperatures Tuesday are expected to be warmer than today's readings, but are somewhat dependent on how quickly the clouds thicken and lower. A few hours difference in timing could be the difference between highs in the upper 50s and highs in the mid 60s. Temperatures will drop off somewhat Tuesday evening as precipitation onsets, before flattening out until after the passage of the surface wave. Across southern portions of the area near the baroclinic zone, temperatures could even rise a bit after midnight. Long Term (Wednesday through Sunday night) Issued at 300pm CST Monday Feb 17 2025 With the passage of the surface wave to the east of the area Wednesday morning, precipitation will end, and the arctic airmass will arrive. Little, if any, recovery in temperatures is expected during the daytime hours Wednesday, especially if clouds hold in all day as expected. It's entirely possible that the highs for the day could occur before most folks get out of bed Wednesday morning. Sub-freezing temperatures will be likely for most of the area both Thursday and Friday mornings, with hard freeze conditions likely, especially Friday morning, for at least the northern half of the area. It won't be as cold as the January cold wave, but considering the warmth of the last couple weeks, it is going to be a shock to both vegetation, which had already started greening up, and to people. Entirely possible that record lows will be threatened in some areas, especially Friday morning. Wind chill values in the teens and 20s are likely Thursday and Friday mornings. Cold Weather Advisories for much of the area are almost certain to be issued in later forecast packages for those mornings. Sunshine should allow temperatures to moderate somewhat by Friday afternoon. Another shortwave moving near the Gulf Coast may spread some light precipitation into the area by Saturday afternoon or Saturday night, but temperatures should have moderated sufficiently to eliminate the potential for freezing or frozen precipitation. Temperature forecast is going to be a battle for the second half of the week. As noted above, we may not see any recovery Wednesday. For Thursday and Friday, current numbers are a blended solution, somewhat toward the non-ECMWF (European Centre for Medium-Range Weather Forecasts) solution, but can't discount those, as there is quite a bit of agreement within the ECMWF ensemble. By Sunday into early next week, temperatures will have moderated to near or above normal. Marine Issued at 300pm CST Monday Feb 17 2025 Wind conditions have relaxed across the waters, but this is only a brief respite. Easterly winds are expected to increase during the day Tuesday, and Small Craft Exercise Caution headlines, and possibly Small Craft Advisories, are likely to be needed by tomorrow afternoon across the western waters. Mariners should expect a prolonged period of hazardous conditions across most waters from Tuesday afternoon or Tuesday night into at least Friday morning, before there's significant improvement in conditions. NOAA New Orleans LA Office: Watches - Warnings - Advisories LA...None. GM...None. MS...None. GM...None. |