Southwest Pass of the Mississippi River to Port Fourchon Louisiana Marine Forecast
| Today...Southeast Winds 5 To 10 Knots. Seas Around 2 Feet. Wave Detail: Southeast 2 Feet At 7 Seconds. |
| Tonight...South Winds 5 To 10 Knots. Seas 1 To 2 Feet. Wave Detail: Southeast 2 Feet At 7 Seconds. |
| Friday...Southeast Winds 5 To 10 Knots. Seas 1 To 2 Feet. Wave Detail: Southeast 2 Feet At 6 Seconds. |
| Friday Night...South Winds 10 To 15 Knots. Seas 2 To 3 Feet. Wave Detail: Southeast 2 Feet At 6 Seconds. |
| Saturday...South Winds 5 To 10 Knots. Seas 1 To 2 Feet. Wave Detail: Southeast 2 Feet At 5 Seconds. |
| Saturday Night...South Winds 5 To 10 Knots, Becoming West 10 To 15 Knots After Midnight. Seas 1 To 2 Feet. Wave Detail: Southeast 1 Foot At 5 Seconds. A Slight Chance Of Showers And Thunderstorms After Midnight. |
| Sunday...Northeast Winds 20 To 25 Knots. Seas 3 To 5 Feet, Occasionally To 6 Feet. Wave Detail: North 4 Feet At 4 Seconds. A Slight Chance Of Showers And Thunderstorms In The Morning. |
| Sunday Night...Northeast Winds 20 To 25 Knots. Seas 3 To 5 Feet, Occasionally To 6 Feet. Wave Detail: East 5 Feet At 5 Seconds. |
| Monday...East Winds 20 To 25 Knots. Seas 3 To 5 Feet, Occasionally To 6 Feet. Wave Detail: East 5 Feet At 6 Seconds. |
| Monday Night...East Winds 15 To 20 Knots. Seas 2 To 4 Feet, Occasionally To 5 Feet. Wave Detail: East 4 Feet At 6 Seconds. Winds And Seas Higher In And Near Thunderstorms. |
| Area Forecast Discussion National Weather Service New Orleans LA 126pm CDT Fri Oct 2 2026 .SHORT TERM... (Now through Monday) Issued at 1232pm CDT Fri Oct 2 2026 No change to the overall short term forecasting and conditions that we've been putting out the past several forecast cycle. We are still looking at a setup of very high Precipitable Water in the atmosphere, near record values on the order of 2.5-2.6 inches. The moisture is being driven by onshore, return flow out of the Gulf that is traveling around the periphery of high pressure in the Atlantic and eastern Gulf. A low pressure center and associated troughing and frontal boundary is over the southern plains and it is tapping into tropical moisture from activity in the Pacific. A weak jet streak associated with the troughing will position itself with the right rear quadrant over our area will provide added lifting mechanism to give the moisture an upward boost. We are confident that rain will be occurring across the area through the weekend. The real question is how much will it rain. A gradient of heavy rain totals through Sunday night into Monday morning will be on the order of 2 inches over our northwest parishes/counties ramping up to 4-6 inches over coastal LA and MS. Isolated areas of higher intensity will be possible with worst- case totals up to 8-10 inches in coastal LA and MS. The rain is not expected to be a constant presence through the weekend, rather there will be some lulls with weaker and stronger periods of rainfall. This overall setup is definitely favorable for isolated flash flooding especially in low lying and/or poorly drained areas. If there is any good news in the forecast, it is that conditions do not support any severe activity, although some lightning may occur along with a stronger storm cell. With the rainfall and the front in the area, we are looking at high temperatures in the mid-80s, but the overnight lows still hang in the low to mid 70s. Long Term (Monday night through Thursday night) Issued at 1232pm CDT Fri Oct 2 2026 By Monday night the aforementioned front will effectively stall out in the northern Gulf. Through the week, it will drift further south and this will set up another rain intensity gradient of no rain in our southwestern MS counties to 30-40% Probability of Precipitation over the coastal parishes that gradually decrease to around 20%. Temperatures Marine Issued at 1232pm CDT Fri Oct 2 2026 A tightening pressure gradient over the coastal waters that will form in response to a developing low pressure system in the western Gulf. This will allow southeast winds to remain elevated near 15 knots with higher gusts through Saturday. Very choppy seas of 4 to 6 feet will accompany these winds in the open Gulf waters. These conditions have prompted issuance of Small Craft Exercise Caution in the open waters. The persistent southeasterly winds combined with a high tide cycle, we have also issued a Coastal Flood Advisory. The lakes and sounds will see slightly lower winds closer to 10 knots and choppy conditions through Saturday. Winds will briefly relax to 10 knots or less on Sunday as a front stalls along the coast. This front is expected to then slowly push through the waters on Monday and Tuesday. Winds will turn northeasterly behind the front and increase back to 15 to 20 knots as cooler and drier air advects over the warm waters. Another low will form along the front by Wednesday, and this should increase winds in small craft advisory range of 20 to 25 knots. Seas will also increase to 5 to 7 feet by Wednesday leading to rough conditions. Thunderstorms will also be around today through Monday, but the only main concerns will be from lightning and heavy rainfall reducing visibilities. NOAA New Orleans LA Office: Watches - Warnings - Advisories LA...Coastal Flood Advisory from 10pm this evening to 10am CDT Saturday for LAZ064-070-076-078-091-093-095-097. GM...None. MS...Coastal Flood Advisory from 10pm this evening to 10am CDT Saturday for MSZ086>088. GM...None. |
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