Marine Weather Net

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


REST OF TONIGHT

NW
WINDS
5 - 10
KNOTS

THURSDAY

N
WINDS
10 - 15
KNOTS

THURSDAY NIGHT

W
WINDS
5
KNOTS

FRIDAY

SW
WINDS
5 - 10
KNOTS

The Marine Weather Forecast In Detail:
GMZ575 Forecast Issued: 920 PM CDT Wed Aug 04 2021

Rest Of Tonight...Northwest Winds 5 To 10 Knots Becoming North In The Late Evening. Seas 1 To 3 Feet. Dominant Period 4 Seconds. Chance Of Showers And Thunderstorms Through The Night.
Thursday...North Winds 10 To 15 Knots. Seas 1 To 3 Feet. Dominant Period 8 Seconds. Chance Of Showers And Thunderstorms Through The Day.
Thursday Night...West Winds Near 5 Knots Becoming Southwest After Midnight. Seas 1 To 2 Feet. Dominant Period 8 Seconds. Slight Chance Of Thunderstorms In The Evening. Slight Chance Of Showers Through The Night. Slight Chance Of Thunderstorms After Midnight.
Friday...Southwest Winds 5 To 10 Knots. Seas 1 To 2 Feet. Dominant Period 6 Seconds. Chance Of Showers And Thunderstorms.
Friday Night...Southwest Winds 5 To 10 Knots. Seas 1 To 2 Feet. Dominant Period 5 Seconds. Chance Of Showers And Thunderstorms.
Saturday...Southwest Winds 5 To 10 Knots. Seas 1 To 2 Feet. Dominant Period 5 Seconds. Chance Of Showers And Thunderstorms.
Saturday Night...Southwest Winds 5 To 10 Knots. Seas 1 To 3 Feet. Dominant Period 5 Seconds. Chance Of Showers And Thunderstorms Through The Night.
Sunday...South Winds 5 To 10 Knots. Seas 1 To 2 Feet. Dominant Period 5 Seconds. Chance Of Showers And Thunderstorms.
Sunday Night...South Winds 5 To 10 Knots. Seas 1 To 2 Feet. Dominant Period 4 Seconds. Slight Chance Of Showers And Thunderstorms After Midnight.
Monday...Southeast Winds 5 To 10 Knots. Seas 1 To 2 Feet. Dominant Period 4 Seconds. Chance Of Showers And Thunderstorms.
Monday Night...Southeast Winds 5 To 10 Knots. Seas 2 To 4 Feet. Dominant Period 4 Seconds. Slight Chance Of Showers And Thunderstorms After Midnight.
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Synopsis for Pascagoula to SW Pass Mississippi - GMZ501
Synopsis for SW Pass Mississippi River to Atchafalaya River- GMZ500
920 PM CDT Wed Aug 4 2021

A stationary front will remain settled along and near coastal areas, eventually sagging south into marine areas through late week. High pressure builds into the region this upcoming weekend and into early next week.
Area Forecast Discussion
National Weather Service New Orleans LA
1203am CDT Thu August 5 2021

SHORT TERM... Tonight through Friday... Tonight, some isolated to scattered showers will be possible in the marine waters. These showers will have the potential for gusty winds, frequent lightning, and waterspouts where they occur.

Thursday and Friday, the lingering frontal boundary will continue to move southward into the open Gulf waters. Some upper level ridging will build in on Thursday followed by a short wave upper level trough moving through Friday overnight. Overall rain chances will be low the next few days. Northerly surface winds Thursday will help dry weather to persist and enhance subsidence. Some enhanced rain chances along the Louisiana coastal areas and marine areas will be possible Friday late afternoon and evening. Southerly surface winds Friday will help to enhance warm air advection and lifting in the environment. The main impacts from these showers and storms Friday afternoon and evening will be gusty winds, frequent lightning and locally heavy rainfall. High temperatures will be fairly close to normal over the next few days thanks to the lower humidity values, so that will be a nice change from the hot temperatures we experienced last week. MSW

Long Term Saturday through Tuesday
Saturday and Sunday, a lingering boundary as the shortwave trough moves off the east coast will cause enhanced rain chances, mainly during the afternoon hours. Based on the models currently, the boundary is expected to linger along the coastal MS and LA areas and over the marine areas. Southerly surface winds will help to enhance warm air and moisture advection and lifting in the environment. The PW values (Precipitable Water values) will be just above 2 inches during the afternoon hours, which will be above the 75th percentile for the Storm Prediction Center sounding climatology. Given the parameters that are expected based on the models, there will be the potential for locally heavy rainfall on Saturday and Sunday inside thunderstorm development similar to what we have experienced much of the summer so far. The main timeframe right now is primarily during the afternoon hours Saturday and Sunday. Gusty winds and frequent lightning will also be concerns as these storms linger over the area over the weekend.

Monday and Tuesday, the summertime pattern returns to dominate the region. Scattered showers and storms will be possible, mainly during the afternoon hours both days. Southerly surface winds will help to enhance moisture and warm air advection into the area and will help to enhance lifting in the environment. These storms will have the potential for gusty winds, frequent lightning, and locally heavy rainfall. MSW

Marine Discussion
Winds will be moderate (<15 knots) and northerly tonight and Thursday. Winds will be moderate (<15 knots) and southerly Friday through Wednesday. Wave heigheights will correspond to the wind speeds. MSW

NOAA New Orleans LA Office: Watches - Warnings - Advisories
LA...None. GM...None. MS...None. GM...None.