Southwest Pass of the Mississippi River to Port Fourchon, LA 20 - 60 NM Marine Forecast
|Today...Southwest Winds 5 To 10 Knots. Seas 1 To 2 Feet. Dominant Period 6 Seconds. Slight Chance Of Showers And Thunderstorms Early In The Morning.|
|Tonight...Southwest Winds 5 To 10 Knots. Seas 1 To 2 Feet. Dominant Period 5 Seconds.|
|Thursday...Southwest Winds 5 To 10 Knots. Seas 1 To 2 Feet. Dominant Period 5 Seconds.|
|Thursday Night...Southwest Winds 5 To 10 Knots. Seas 1 To 2 Feet. Dominant Period 5 Seconds.|
|Friday...West Winds 5 To 10 Knots. Seas 1 To 2 Feet. Dominant Period 4 Seconds.|
|Friday Night...West Winds 10 To 15 Knots. Seas 1 To 2 Feet. Dominant Period 4 Seconds.|
|Saturday...West Winds 10 To 15 Knots. Seas 1 To 3 Feet. Dominant Period 4 Seconds.|
|Saturday Night...West Winds 10 To 15 Knots. Seas 1 To 3 Feet. Dominant Period 4 Seconds.|
|Sunday...West Winds 10 To 15 Knots. Seas 1 To 3 Feet. Dominant Period 4 Seconds.|
|Sunday Night...Southwest Winds 10 To 15 Knots. Seas 2 To 4 Feet. Dominant Period 4 Seconds.|
Synopsis for Pascagoula to SW Pass Mississippi - GMZ501|
Synopsis for SW Pass Mississippi River to Atchafalaya River- GMZ500
417 AM CDT Wed Jul 8 2020
High pressure will build from the Gulf northward toward the coast for the rest of the week.
Area Forecast Discussion|
National Weather Service New Orleans LA
313am CDT Wednesday July 8 2020
The upper level pattern is finally beginning to change. The ridge centered near the 4 Corners region of the country will slowly deepen and expand eastward. Yesterday's evening sounding was the first indication of these changes with the PW down to 1.9" as drier air mixed into the lower and mid layers. That's still high enough to support likely POPS, so will be carrying POPs as high as 70% in southwest MS down to 20% on the LA coast. Increasing subsidence and dry air in the column will substantially stunt convection Thursday and Friday. Digging trough through the Ohio River Valley and Appalachian Mountains may bring a few storms across northern fringe of the CWA along the northwesterly flow. If this does take place, will have to monitor for severity as NW flow can sometimes produce overachieving storms.
Moving into the weekend, continued low rain chances combined with increasing 500mb heigheights means high temps will likely begin to soar into the mid 90s. Saturated soils will help to maintain high low level moisture. Mid 90s air temps will mid to upper 70 dewpoints are the perfect recipe for heat advisory conditions. Any reprieve from that heat will likely be on seabreeze and/or outflow boundaries.
South to SW light winds will be maintained by a surface high that will remain over the central to eastern portion of the gulf. As warmer temps move in, the Sounds surface jet will begin to develop toward the end of the week. This feature is normally a west or SW wind that rises to a greater magnitude than other areas and is found from Chandeleur and Breton Sounds eastward through the open waters of the gulf and the Mississippi Sound. These winds could be around 20kt during the night hours toward the end of the week. Nocturnal sh/ts will continue this morning but lower numbers will begin to be noticed tonight and each successive night. Higher winds and seas will be found in and around sh/ts. Relatively drier conditions look to be on the horizon for Thu and Fri. The exception could be waters east of the Miss River. But some sh/ts look to be back again by the weekend for most waters.
NOAA New Orleans LA Office: Watches - Warnings - Advisories
LA...None. GM...None. MS...None. GM...None.