Southwest Pass of the Mississippi River to Port Fourchon, LA 20 - 60 NM Marine Forecast
| Overnight...North Winds 25 To 30 Knots. Seas 8 To 11 Feet, Occasionally To 14 Feet. Wave Detail: North 9 Feet At 7 Seconds. |
| Monday...North Winds 20 To 25 Knots With Gusts Up To 30 Knots. Seas 8 To 11 Feet, Occasionally To 14 Feet, Subsiding To 6 To 9 Feet, Occasionally To 11 Feet In The Afternoon. Wave Detail: North 8 Feet At 7 Seconds, Becoming North 6 Feet At 7 Seconds. |
| Monday Night...North Winds 20 To 25 Knots, Becoming Northeast 15 To 20 Knots After Midnight. Seas 5 To 8 Feet, Occasionally To 10 Feet. Wave Detail: North 5 Feet At 7 Seconds. |
| Tuesday...Northeast Winds 10 To 15 Knots, Becoming East 5 To 10 Knots In The Afternoon. Seas 2 To 4 Feet, Occasionally To 5 Feet. Wave Detail: North 4 Feet At 6 Seconds. |
| Tuesday Night...South Winds 10 To 15 Knots. Seas Around 2 Feet. Wave Detail: Southeast 2 Feet At 5 Seconds. |
| Wednesday...South Winds 5 To 10 Knots. Seas Around 2 Feet. Wave Detail: Southeast 2 Feet At 5 Seconds. |
| Wednesday Night...Southeast Winds 5 To 10 Knots. Seas Around 2 Feet. Wave Detail: South 2 Feet At 5 Seconds. |
| Thursday...East Winds 5 To 10 Knots. Seas Around 2 Feet. Wave Detail: East 2 Feet At 6 Seconds And Southwest 1 Foot At 6 Seconds. |
| Thursday Night...Southeast Winds Around 10 Knots. Seas 2 To 3 Feet. Wave Detail: Southeast 2 Feet At 7 Seconds And Southwest 1 Foot At 6 Seconds. |
| Friday...Southeast Winds 10 To 15 Knots. Seas 2 To 3 Feet. Wave Detail: Southeast 2 Feet At 7 Seconds And Southwest 1 Foot At 6 Seconds. |
| Friday Night...Southeast Winds 10 To 15 Knots. Seas 2 To 4 Feet, Occasionally To 5 Feet. |
| Area Forecast Discussion National Weather Service New Orleans LA 1058pm CST Sunday Nov 9 2025 .SHORT TERM... (Monday through Tuesday night) Issued at 1018pm CST Sunday Nov 9 2025 The cold front that has been well advertised has fully pushed through the area as of this evening. Winds will remain elevated throughout the night and during the day today with frequent gusts up to 25 mph. Strong cold air advection will be continuing this morning, so portions of southwest Mississippi will likely see a very brief window of freezing temps right at sunrise. The cold air advection will also look to keep highs from getting out of the low to mid 50s. Temps were also still nudged down from deterministic NBM to account for this. These high winds, combined with very low RH values of 20-30 percent will lead to critical fire weather conditions during the day today. To read a more in depth the fire weather danger today, read the FIRE WEATHER section at the bottom. As we get into Monday night and Tuesday morning, ridging moving southward across the southern plains on the backside of the upper-level trough will form a surface high pressure right over our area. This will promote efficient radiative cooling Tuesday morning on top of the Arctic air that has been advecting over the area. This will lead to widespread freeze conditions for areas along and north of the I-10/12 corridor as well as the river Parishes. Some locations (mainly the river basins) could briefly see "hard freeze" conditions Tuesday morning. This comes after the 50th percentile was blended in to the lows Tuesday morning to account for the radiative cooling mentioned before since the deterministic NBM is still just under the 75th percentile. The main wrench that could cause lows to not get down so low is some weak warm air advection, but that seems very minimal at this time. RH values will still be around critical thresholds (25-30 percent) during the afternoon on Tuesday, but with the high pressure centered over the area, winds will be drastically lower than Monday. Long Term (Wednesday through Sunday night) Issued at 1018pm CST Sunday Nov 9 2025 The aforementioned surface high will continue to slide eastward across the north Gulf on Wednesday in association with an amplifying ridge over the central Rockies and provide warm and moist air to advect back into the area. This will lead to quite pleasant conditions Wednesday through Friday with highs in the low to upper 70s across the area. There is a signal in the long-range guidance that a more active pattern starts to take over across the central CONUS. However, long range ensemble clustering still shows that there are significant differences in timing and evolution of the troughs that will come across the country next weekend. So, at this time, this is just something to monitor for any changes as we get closer into the weekend. For what its worth, some of the machine- learning guidance is hinting at an elevated severe weather risk this weekend, but remaining mostly north of here. Again, there is too much ensemble difference to say any more than that at this point, so this will be something to keep an eye on as we get later in the week. Marine Issued at 1018pm CST Sunday Nov 9 2025 A strong cold front has pushed through the coastal waters with strong northerly winds behind it. Strong cold air advection overnight and much warmer water compared to the air above it tonight will lead to efficient mixing and winds gusting to Gales early this morning. The strong northerly winds will also lead to seas of 9-12 feet over the open waters. Due to the persistence of these frequent wind gusts there continues to be a Gale Warning for the western 2 thirds of our open Gulf waters. The winds will relax some after sunrise over all of the waters. Latest guidance has backed down on winds right above the surface, so confidence on downgrading the Gale Watch east of the river to a SCY got higher. Winds should be 20-27 knots over the open waters and gusting to 30kt. After Monday, high pressure filters across the waters and winds relax dramatically during the day Tuesday and benign conditions takeover thereafter. Fire Weather Issued at 614pm CST Sunday Nov 9 2025 A cold front has moved through the area with very dry air now in place. Northerly winds have already increased behind the front and will remain elevated through Monday, with gusts up to 30 mph at times. These winds combined with very low RH values, falling to near or below 25 percent, will result in critical fire weather conditions across all of southeast Louisiana and southern Mississippi on Monday. A Red Flag Warning is in effect from 10am to 6pm CST Monday for the entire area due to the previously mentioned combination of strong northerly winds and critically low humidity. Any fires that develop will have the potential to spread rapidly. Outdoor burning is strongly discouraged. Winds will gradually diminish late Monday into Tuesday as a surface high builds over the area. However, the very dry air mass will linger, keeping minimum RH values very low, generally below 30 percent, Tuesday afternoon. Conditions should improve by midweek as winds decrease further and moisture begins to return. NOAA New Orleans LA Office: Watches - Warnings - Advisories LA...Red Flag Warning from 10am to 6pm CST Monday for LAZ034>037- 039-046>048-056>060-064>071-076>090. Freeze Watch from Monday evening through Tuesday morning for LAZ034>037-039-046>048-056>060-065-071-076-079>086-088>090. GM...Gale Warning until 9am CST Monday for GMZ530-550-552-555-570- 572-575. Small Craft Advisory from 9am Monday to midnight CST Monday night for GMZ530-550-552-555-570-572-575. Small Craft Advisory until midnight CST Monday night for GMZ532- 534-536-538-557-577. MS...Red Flag Warning from 10am to 6pm CST Monday for MSZ068>071- 077-080>082. Freeze Watch from Monday evening through Tuesday morning for MSZ068>071-077-083>088. GM...Gale Warning until 9am CST Monday for GMZ550-552-555-570-572- 575. Small Craft Advisory from 9am Monday to midnight CST Monday night for GMZ550-552-555-570-572-575. Small Craft Advisory until midnight CST Monday night for GMZ534- 536-538-557-577. |
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