Marine Weather Net

Stake Island, LA to Southwest Pass of the Mississippi River out 20 - 60 NM Marine Forecast


REST OF TONIGHT

SW
WINDS
5 - 10
KNOTS

THURSDAY

SW
WINDS
10 - 15
KNOTS

THURSDAY NIGHT

SW
WINDS
10 - 15
KNOTS

FRIDAY

SW
WINDS
15 - 20
KNOTS

The Marine Weather Forecast In Detail:
GMZ575 Forecast Issued: 951 PM CST Wed Jan 20 2021

Rest Of Tonight...Southwest Winds 5 To 10 Knots. Seas 1 To 2 Feet. Dominant Period 5 Seconds.
Thursday...Southwest Winds 10 To 15 Knots. Seas 1 To 2 Feet. Dominant Period 4 Seconds.
Thursday Night...Southwest Winds 10 To 15 Knots. Seas 2 To 4 Feet. Dominant Period 4 Seconds.
Friday...Southwest Winds 15 To 20 Knots. Seas 2 To 4 Feet. Dominant Period 4 Seconds. Chance Of Showers.
Friday Night...West Winds 10 To 15 Knots Becoming Northeast After Midnight. Seas 2 To 4 Feet. Dominant Period 5 Seconds. Chance Of Showers Through The Night.
Saturday...East Winds 10 To 15 Knots. Seas 2 To 4 Feet. Dominant Period 5 Seconds. Slight Chance Of Showers In The Morning.
Saturday Night...Southeast Winds 10 To 15 Knots. Seas 2 To 4 Feet. Dominant Period 5 Seconds.
Sunday...Southeast Winds Near 15 Knots. Seas 2 To 4 Feet.
Sunday Night...South Winds 15 To 20 Knots. Seas 3 To 5 Feet. Slight Chance Of Showers After Midnight.
Monday...Southwest Winds 15 To 20 Knots. Seas 3 To 6 Feet. Slight Chance Of Showers Through The Day.
Monday Night...West Winds 15 To 20 Knots. Seas 3 To 6 Feet. Slight Chance Of Showers Through The Night.
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Synopsis for Pascagoula to SW Pass Mississippi - GMZ501
Synopsis for SW Pass Mississippi River to Atchafalaya River- GMZ500
951 PM CST Wed Jan 20 2021

weak cold front will move into the coastal waters and stall Saturday then move back to the north as a warm front Sunday. Another cold front could move into the northern gulf by the start of next week.
Area Forecast Discussion
National Weather Service New Orleans LA
1146pm CST Wednesday Jan 20 2021

Updated for 06z aviation discussion.

UPDATE... Some fog has developed in mainly coastal areas of southeast Louisiana. The expansion of this fog and development in other areas is a bit low confidence at this time due to layered clouds of various amounts across the forecast area. Went ahead and issued a dense fog advisory for lower Plaquemines Parish and downwind/adjacent coastal waters and Breton Sound where the early fog development is likely to to be most persistent due to the cold Mississippi River water. Updates have been sent. 22/TD

SHORT TERM... As dew point temperatures are rising, moisture is making its way back into the area. Rainfall expected to affect the area starting Thursday evening. Thunderstorms are not expected at this time, but one or two lightning strikes cannot be ruled out. There is a possibility of having another night of dense fog if not worse tonight. Patchy fog was added starting at shoreline tonight and moving up through the area overnight into the morning. At this time confidence is not high enough for us to issue a dense fog advisory, however the evening shift will monitor it closely and make a decision thereafter. /TDB/

Long Term Looking ahead at a cold front stalling over the Gulf Saturday that moves back north over the area Sunday as a warm front. This isentropic lift over the frontal boundary could bring for more showers for the weekend through at least Monday afternoon. This will also allow for temperatures to continue their warmer than normal trend through at least Tuesday. Precip will finally move east out of the area bringing back drier conditions through the forecast period. Otherwise, no changes were made in the longterm forecast. /TDB/

AVIATION... Visibility and ceiling restrictions have improved since this morning. VFR conditions should prevail through the day, however restrictions are expected to return late tonight through tomorrow. IFR and LIFR conditions are expected mainly for KMSY and KHUM late tonight into tomorrow, but are expected to improved some time tomorrow morning. /TDB/

Marine Discussion
Winds shift from the SE to the SW by tomorrow night. However, expect for wind speeds to remain fairly light near 10 kts with periods of gusts near 15 kts by Thursday night with light to moderate rain expected through the weekend. Seas should also remain round 1 to 3 feet. Possibility for some fog near and over the coastal waters tonight through tomorrow morning so patchy fog was added to the grids. At this time, confidence is not high enough to issue a dense fog advisory, but the evening shift will continue to monitor the conditions. /TDB/

NOAA New Orleans LA Office: Watches - Warnings - Advisories
LA...Dense Fog Advisory until 8am CST Thursday for LAZ069.

GM...Dense Fog Advisory until 8am CST Thursday for GMZ538-555.

MS...None. GM...Dense Fog Advisory until 8am CST Thursday for GMZ555.