Southwest Pass of the Mississippi River to Port Fourchon Louisiana Marine Forecast
| This Afternoon...South Winds 10 To 15 Knots. Seas 2 To 4 Feet, Occasionally To 5 Feet. Wave Detail: South 4 Feet At 7 Seconds. Areas Of Dense Fog Early. Areas Of Dense Fog Early, Then Patchy Fog Late. Visibility 1 Nm Or Less. |
| Tonight...South Winds 10 To 15 Knots. Seas 2 To 4 Feet, Occasionally To 5 Feet. Wave Detail: South 4 Feet At 7 Seconds. Patchy Fog In The Evening. Widespread Dense Fog After Midnight. Visibility 1 Nm Or Less. |
| Saturday...Southwest Winds 5 To 10 Knots. Seas 2 To 3 Feet. Wave Detail: South 3 Feet At 7 Seconds. Patchy Dense Fog. A Slight Chance Of Showers In The Afternoon. Visibility 1 Nm Or Less. |
| Saturday Night...West Winds 15 To 20 Knots With Gusts Up To 25 Knots, Becoming North 25 To 30 Knots After Midnight. Seas 2 To 4 Feet, Occasionally To 5 Feet, Building To 4 To 6 Feet, Occasionally To 8 Feet After Midnight. Wave Detail: Northwest 3 Feet At 3 Seconds And South 3 Feet At 7 Seconds, Becoming Northwest 6 Feet At 4 Seconds And Southeast 4 Feet At 8 Seconds. Widespread Dense Fog In The Evening. A Chance Of Showers With A Slight Chance Of Thunderstorms In The Evening, Then A Slight Chance Of Showers After Midnight. Visibility 1 Nm Or Less In The Evening. |
| Sunday...North Winds 25 To 30 Knots, Diminishing To 20 To 25 Knots In The Afternoon. Seas 4 To 6 Feet, Occasionally To 8 Feet. Wave Detail: Northeast 6 Feet At 5 Seconds. |
| Sunday Night...North Winds 20 To 25 Knots With Gusts Up To 30 Knots. Seas 3 To 5 Feet, Occasionally To 6 Feet. Wave Detail: North 4 Feet At 4 Seconds. |
| Monday...North Winds 20 To 25 Knots, Diminishing To 15 To 20 Knots In The Afternoon. Seas 3 To 5 Feet, Occasionally To 6 Feet. Wave Detail: North 4 Feet At 4 Seconds. |
| Monday Night...North Winds 15 To 20 Knots. Seas 2 To 3 Feet. Wave Detail: North 3 Feet At 3 Seconds. |
| Tuesday...Northeast Winds 10 To 15 Knots, Becoming Southeast Around 5 Knots In The Afternoon. Seas 1 To 2 Feet In The Morning, Then 1 Foot Or Less. Wave Detail: Northeast 2 Feet At 3 Seconds, Becoming East 1 Foot At 3 Seconds. |
| Tuesday Night...South Winds 10 To 15 Knots. Seas 1 To 2 Feet, Building To 2 To 3 Feet After Midnight. Wave Detail: South 1 Foot At 3 Seconds, Becoming South 3 Feet At 4 Seconds. Winds And Seas Higher In And Near Thunderstorms. |
| Area Forecast Discussion National Weather Service New Orleans LA 1027am CST Fri Feb 20 2026 .SHORT TERM... (This afternoon through Saturday) Issued at 1017am CST Fri Feb 20 2026 Tonight into Saturday morning, some patchy dense fog will be possible, looking at the models. The model probabilities of fog overnight are generally low (10-20%), and the fog looks to be greater than 1-2 SM, so a dense fog advisory was not issued. A weak frontal system pushes through the area late Saturday into Sunday. Looking at the models, the system is fairly weak overall in recent trends. Severe weather is not expected for our area, but we could see some strong storms as it moves through with gusty winds (30-40mph) and lightning, especially east of I-55. In terms of the rainfall, we are generally expecting less than an inch of rainfall for the system as it pushes through late Saturday into Sunday. MSW Long Term (Saturday night through Thursday) Issued at 1017am CST Fri Feb 20 2026 On the backside of the frontal system, cold air advection will bring cold temperatures and drier conditions into the area. Low temperatures on Monday will be in the mid to upper 30s with highs in the mid 50s. Some locations in southwest MS could be approaching freezing. Currently, low temperatures on Tuesday will be in the upper 20s and low 30s with some locations forecast to see temperatures below freezing, mainly for areas north of I-10/12. After Tuesday, we start to see a warming trend next week with near-normal temperatures returning to the area. Little to no rainfall is expected next week through at least Thursday. MSW Marine Issued at 1017am CST Fri Feb 20 2026 Moderate onshore flow of 10 to 15 knots will persist with patchy dense fog each night/morning through Saturday. A strong cold front will move through the coastal waters Saturday night into Sunday morning with high pressure building in again behind it. The combination of a tight pressure gradient and cold air advection will cause winds to strengthen and turn offshore again Saturday evening. Once hazardous conditions set in Saturday evening, Gale conditions are expected. A Gale Watch is in effect for Sunday morning through Sunday afternoon. A Small Craft Advisory is in effect from Sunday afternoon through Monday afternoon. NOAA New Orleans LA Office: Watches - Warnings - Advisories LA...None. GM...Gale Watch from late Saturday night through Sunday morning for GMZ530-532-534-536-538-550-552-555-557-570-572-575-577. Small Craft Advisory from noon Sunday to noon CST Monday for GMZ530-532-534-536-538-550-552-555-557-570-572-575-577. Dense Fog Advisory until noon CST today for GMZ532-534-536-538- 550-552-555. MS...None. GM...Gale Watch from late Saturday night through Sunday morning for GMZ532-534-536-538-550-552-555-557-570-572-575-577. Small Craft Advisory from noon Sunday to noon CST Monday for GMZ532-534-536-538-550-552-555-557-570-572-575-577. Dense Fog Advisory until noon CST today for GMZ534-536-538-550- 552-555. |
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