Boothville, LA to Southwest Pass of the Mississippi River Marine Forecast
| Today...Southeast Winds Around 5 Knots. Seas 1 Foot Or Less. Wave Detail: Southeast 1 Foot At 3 Seconds. Patchy Dense Fog Until Late Afternoon. |
| Tonight...Southeast Winds Around 5 Knots, Becoming West After Midnight. Seas 1 Foot Or Less. Wave Detail: Southeast 1 Foot At 4 Seconds. Patchy Dense Fog In The Evening. Widespread Dense Fog After Midnight. A Slight Chance Of Showers After Midnight. Visibility 1 Nm Or Less. |
| Sunday...North Winds 20 To 25 Knots With Gusts Up To 30 Knots. Seas 2 To 4 Feet, Occasionally To 5 Feet, Building To 4 To 6 Feet, Occasionally To 8 Feet In The Afternoon. Wave Detail: East 3 Feet At 4 Seconds And Northwest 2 Feet At 3 Seconds, Becoming Northeast 6 Feet At 5 Seconds. A Chance Of Showers With A Slight Chance Of Thunderstorms In The Morning With Visibility 1 Nm Or Less. |
| Sunday Night...Northeast Winds 20 To 25 Knots With Gusts Up To 30 Knots. Seas 5 To 7 Feet, Occasionally To 9 Feet. Wave Detail: Northeast 7 Feet At 7 Seconds And Northeast 5 Feet At 4 Seconds. |
| Monday...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 7 Seconds. |
| Monday Night...East Winds 5 To 10 Knots. Seas 2 To 3 Feet. Wave Detail: East 3 Feet At 6 Seconds. |
| Tuesday...East Winds 5 To 10 Knots. Seas Around 2 Feet. Wave Detail: East 2 Feet At 5 Seconds. |
| Tuesday Night...Southeast Winds 5 To 10 Knots. Seas Around 2 Feet. Wave Detail: East 2 Feet At 5 Seconds. |
| Wednesday...Southeast Winds 5 To 10 Knots. Seas Around 2 Feet. Wave Detail: Southeast 2 Feet At 5 Seconds. A Slight Chance Of Showers In The Afternoon. |
| Wednesday Night...Southeast Winds 5 To 10 Knots. Seas 2 To 3 Feet. A Slight Chance Of Showers. Winds And Seas Higher In And Near Thunderstorms. |
| Area Forecast Discussion National Weather Service New Orleans LA 549am CST Sat Dec 13 2025 .SHORT TERM... (Tonight through Sunday night) Issued at 1012pm CST Fri Dec 12 2025 The immediate concern of the short term period is the potential for dense fog across the area tonight. With more than one model showing decent probabilities overnight and the moisture and light winds making for a good environment, a Dense Fog Advisory has been issued for the entire area through 9AM Saturday. Weak high pressure at the surface will start to break down heading into the weekend as our next system approaches. In the upper levels a quick shortwave moves across the region, while a deep trough moves across the Midwest. Back at the surface a strong cold front associated with the Midwestern trough will creep down towards our area, likely making it through the coast by Sunday afternoon. We will already start to see the effects of this cold front in the Sunday high temperatures. The MaxT's for Sunday will actually more than likely happen in the morning rather than the afternoon because the front will already be pushing through most areas during the "normal" daytime high time. By afternoon we start to see temperatures rapidly decrease across the area, into the 30s by late evening. In terms of precipitation, the best chance for rain is looking to be late Saturday night into early Sunday with most areas seeing a 50-60% chance of rain, but far northern areas see closer to a 70-80% chance. Looking at Quantitative Precipitation Forecast this should be a pretty light rain with most areas seeing less than a half inch of rain. The main threat of the short term comes Sunday night into early Monday with the cold air rushing in. MinTs are sitting in the low to mid 20s for everywhere north of the lake and the low 30s south of the lake. On top of the air temperature being cold, we will also have breezy winds gusting 15-20mph overnight which brings Wind Chills into the teens for northern areas and the low to mid 20s for southern areas. Made some adjustments to the drainage areas as those tend to cool more. That being said, everything right now would be well into Cold Weather Advisory criteria and some areas along the northshore and Coastal MS would be hovering around Extreme Cold Warning criteria. Knowing this, expect cold weather headlines Monday morning but exactly which ones is still uncertain. Long Term (Monday through Friday night) Issued at 1012pm CST Fri Dec 12 2025 Following the cold snap early Monday morning, we warm up into the upper 40s to lower 50s for afternoon highs. After the cold front passes, we see riding start to build to our west and move its way westward. Throughout early week this ridge will move closer to the central Gulf Coast region. This helps us warm right back up after out cold spell, with Tuesday Max T's already back into the 60s for most areas and Wednesday will already be near the 70 degree mark for most. After the rain associated with the big cold front, we don't see any notable rain chances again through the rest of the long term period. Very minor chances on Thursday, but only ~15-20%. Winds turn back onshore by Tuesday which will push some moisture back into the area and that may aid in some fog development some mornings next week. Marine Issued at 1012pm CST Fri Dec 12 2025 Light onshore winds of 10 knots or less and calm seas of 2 feet or less will persist over the waters through Saturday as a broad area of high pressure remains centered over the region. A rapid change in conditions will then take place Saturday night and Sunday morning as a very strong cold front moves through. Winds will turn northerly and increase in speed to between 25 and 30 knots with higher gusts from mid day Sunday through Monday morning. There is a decent probability that headlines will be issued for the waters over this time period due to high winds and rough seas anticipated. Another high will then quickly settle over the area on Tuesday, and this will allow winds to turn more easterly and fall back to less than 10 knots. Seas will also begin to subside as the winds decrease Monday night into Tuesday. NOAA New Orleans LA Office: Watches - Warnings - Advisories LA...Dense Fog Advisory until 9am CST this morning for LAZ034>037- 039-046>048-056>060-064>071-076>090. GM...None. MS...Dense Fog Advisory until 9am CST this morning for MSZ068>071- 077-083>088. GM...None. |
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