Marine Weather Net

Southwest Pass of the Mississippi River to Port Fourchon, LA 20 - 60 NM Marine Forecast


REST OF TONIGHT

NW
WINDS
5 - 10
KNOTS

FRIDAY

NE
WINDS
5 - 10
KNOTS

FRIDAY NIGHT

SE
WINDS
5 - 10
KNOTS

SATURDAY

SE
WINDS
5 - 10
KNOTS

The Marine Weather Forecast In Detail:
GMZ572 Forecast Issued: 1030 PM CDT Thu Sep 24 2020

Rest Of Tonight...Northwest Winds 5 To 10 Knots. Seas 3 To 5 Feet. Dominant Period 6 Seconds.
Friday...Northeast Winds 5 To 10 Knots. Seas 2 To 4 Feet. Dominant Period 6 Seconds.
Friday Night...Southeast Winds 5 To 10 Knots. Seas 1 To 2 Feet. Dominant Period 6 Seconds.
Saturday...Southeast Winds 5 To 10 Knots. Seas 1 Foot Or Less. Dominant Period 5 Seconds.
Saturday Night...South Winds 5 To 10 Knots. Seas 1 Foot Or Less. Dominant Period 5 Seconds. Slight Chance Of Showers After Midnight.
Sunday...Southwest Winds 5 To 10 Knots Becoming East In The Afternoon. Seas 1 Foot Or Less. Dominant Period 4 Seconds. Chance Of Showers.
Sunday Night...Southeast Winds 5 To 10 Knots Becoming South After Midnight, Then Becoming Northwest After Midnight. Seas 1 Foot Or Less. Dominant Period 4 Seconds. Chance Of Showers And Slight Chance Of Thunderstorms After Midnight.
Monday...North Winds 10 To 15 Knots. Seas 1 To 2 Feet. Dominant Period 4 Seconds. Chance Of Showers And Thunderstorms Through The Day.
Monday Night...North Winds Near 10 Knots Rising To 15 To 20 Knots In The Late Evening. Seas 1 To 2 Feet. Dominant Period 4 Seconds. Slight Chance Of Showers And Thunderstorms.
Tuesday...Northeast Winds 15 To 20 Knots. Seas 1 To 2 Feet. Dominant Period 4 Seconds.
Tuesday Night...North Winds 10 To 15 Knots. Seas 2 To 4 Feet. Dominant Period 4 Seconds.
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Synopsis for Pascagoula to SW Pass Mississippi - GMZ501
Synopsis for SW Pass Mississippi River to Atchafalaya River- GMZ500
1030 PM CDT Thu Sep 24 2020

High pressure will begin to build over the northern Gulf as the remnants of Beta moves northeast. A cold front is forecast to move through the coastal waters this weekend with a reinforcing front to follow by middle of next week.
Area Forecast Discussion
National Weather Service New Orleans LA
710pm CDT Thu September 24 2020

Extensive cloud cover over the area needed some forecast sky cover adjustments for the current trends. Otherwise, forecast was generally on track with only some minor adjustments made to the hourly temperatures and dewpoints. Forecast updates have been sent.

22/TD

Beta's remnants currently are moving northeastward around the Mississippi/Alabama/Tennessee border. It is leaving us with a extensive clouds spanning from the upper Texas coast to just north of the Louisiana coast northward into Arkansas and central Mississippi. Guidance generally was eroding the cloud deck too quickly so had to adjust the sky cover a bit to slow it down. After what's left of Beta exits our area, the Atlantic finally is quiet in the first time in the past month or so. Still not out of the woods for this year (also, it's 2020) but I'll take any quiet weather we can get.

Some of the tides are still a bit elevated, particularly in Lakes Pontchartrain and Maurepas, but winds shifting westerly/northwesterly should help get all that extra water drained out. Downgraded any coastal flood warnings to advisories for the tidal lakes and in Hancock Co just for one more high astronomical tide cycle and then water levels should get low enough that those can be dropped tomorrow afternoon.

Dry air and fall like weather will be in the area before two cold fronts will be passing through the area. The first one is associated with a shortwave getting cutoff low around eastern Texas. This one has some potential for showers and thunderstorms so put in slight chance PoPs. The second cold front is forecast to reach the area late Tuesday and Wednesday and is associated with a much more vigorous digging upper level trough. This front looks to be dry for the most part with PW being around 0.5 inches. -BL

AVIATION... Satellite indicates extensive MVFR (Marginal Visual Flight Rules) cloud deck at the internal sites for the next 24 hours. There may be some back and forth between VFR and MVFR (Marginal Visual Flight Rules) conditions for terminals near the coast. /TDB/

Marine Discussion
Small craft advisory criteria hazards were canceled as the winds and seas diminished this morning. High pressure expected to build over the northern gulf as the remnants of Beta move northeast. Model guidance shows a cold front moving through the coastal waters this weekend as well as another reinforcing front by the middle of next week. Winds are expected to remain light through the weekend, and pick up to moderate levels as the second front moves offshore due to cold air advection./TDB/

NOAA New Orleans LA Office: Watches - Warnings - Advisories
LA...Coastal Flood Advisory until noon CDT Friday for LAZ040-049-050- 058-060>062-072.

GM...None. MS...Coastal Flood Advisory until noon CDT Friday for MSZ080.

GM...None.