Marine Weather Net

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


TONIGHT

S
WINDS
25
KNOTS

THURSDAY

W
WINDS
30 - 35
KNOTS

THURSDAY NIGHT

W
WINDS
25
KNOTS

FRIDAY

W
WINDS
25
KNOTS

The Marine Weather Forecast In Detail:
GMZ575 Forecast Issued: 352 PM CDT Wed Oct 27 2021

SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY MORNING ...GALE WATCH IN EFFECT FROM THURSDAY MORNING THROUGH FRIDAY AFTERNOON...
Tonight...South Winds 25 To 30 Knots Becoming West After Midnight. Seas 5 To 8 Feet With Occasional Seas To 10 Feet. Dominant Period 7 Seconds. Waves Or Seas Building To 8 To 12 Feet With Occasional Seas To 13 Feet. Dominant Period 7 Seconds After Midnight. Showers In The Evening. Thunderstorms Likely Through The Night. Showers Likely After Midnight.
Thursday...West Winds 30 To 35 Knots. Seas 8 To 12 Feet With Occasional Seas To 13 Feet. Dominant Period 8 Seconds. Waves Or Seas Building To 12 To 16 Feet With Occasional Seas To 19 Feet. Dominant Period 8 Seconds In The Afternoon.
Thursday Night...West Winds 25 To 35 Knots. Seas 14 To 18 Feet With Occasional Seas To 25 Feet. Dominant Period 14 Seconds. Slight Chance Of Showers.
Friday...West Winds 25 To 35 Knots. Seas 14 To 18 Feet With Occasional Seas To 23 Feet. Dominant Period 9 Seconds. Chance Of Showers.
Friday Night...Northwest Winds 25 To 30 Knots. Seas 14 To 18 Feet With Occasional Seas To 20 Feet. Dominant Period 8 Seconds. Waves Or Seas Subsiding To 10 To 14 Feet With Occasional Seas To 17 Feet. Dominant Period 8 Seconds After Midnight. Slight Chance Of Showers In The Evening.
Saturday...Northwest Winds 20 To 25 Knots. Seas 6 To 10 Feet With Occasional Seas To 11 Feet. Dominant Period 6 Seconds. Waves Or Seas Subsiding To 4 To 7 Feet With Occasional Seas To 9 Feet. Dominant Period 6 Seconds In The Afternoon.
Saturday Night...Northwest Winds 15 To 20 Knots. Seas 3 To 6 Feet With Occasional Seas To 8 Feet. Dominant Period 5 Seconds.
Sunday...North Winds 10 To 15 Knots. Seas 3 To 5 Feet. Dominant Period 5 Seconds.
Sunday Night...Northeast Winds 10 To 15 Knots. Seas 2 To 4 Feet. Dominant Period 4 Seconds.
Monday...Northeast Winds 10 To 15 Knots. Seas 2 To 4 Feet. Dominant Period 4 Seconds.
Monday Night...Northeast 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
352 PM CDT Wed Oct 27 2021

A very strong low pressure system moving into the Mississippi River Valley will cause a strong cold front to move through the coastal waters tonight into Thursday. Hazardous conditions are expected to develop across the western coastal waters of southeast Louisiana this afternoon and spread eastward as the day progresses. These conditions will continue through the end of the week, especially over the open waters.
Area Forecast Discussion
National Weather Service New Orleans LA
347pm CDT Wednesday Oct 27 2021

.SHORT TERM... The much anticipated cold front has pushed into our western zones, and a good portion of our area ahead of this line has entered the warm sector thanks to a northward surging warm front. A strong tornado and damaging wind threat will exist for the remainder of the afternoon into the evening hours as CAPE well over 2000 J/kg and 0-3km SRH over 250 m2/s2 persists during this timeframe. The threat area will shift east as the day comes to close with a tornado watch out to 10 pm. The risk for severe weather will quickly come to an end from west to east as the front pushes through. Behind the front, there will some lingering showers but that will end quickly as well. Winds will shift to the west/northwest and will be gusty at times. 23

Long Term
Expect much cooler, drier air behind the front as surface high pressure builds into the region by the end of the week. Our area will remain under northwesterly flow aloft which will help reenforce the cool conditions at the surface, especially for Friday and Saturday night. The flow aloft becomes more zonal by the end of the weekend, but our area will remain dry through the end of the forecast period. 23

Marine
Hazardous conditions will exist throughout much of the forecast period as the cold front pushes through this evening. Strong to severe thunderstorms will be possible until the frontal passage. Afterwards, west to northwest winds will likely increase to Gale force winds, sustained winds in excess of 34 knots with higher gusts, for much of Thursday and Friday. Winds will begin to relax by the weekend as the pressure gradient subsides. 23

NOAA New Orleans LA Office: Watches - Warnings - Advisories
LA...None. GM...Gale Watch from 1am CDT Thursday through Friday afternoon for GMZ550-552-570-572.

Small Craft Advisory until 1am CDT Thursday for GMZ550-552-570- 572.

Gale Watch from Thursday morning through Friday afternoon for GMZ536-538-555-557-575-577.

Small Craft Advisory until 7am CDT Thursday for GMZ536-538-555- 557-575-577.

Small Craft Advisory until 4pm CDT Friday for GMZ530-532-534.

MS...None. GM...Gale Watch from 1am CDT Thursday through Friday afternoon for GMZ552-570-572.

Small Craft Advisory until 1am CDT Thursday for GMZ552-570-572.

Gale Watch from Thursday morning through Friday afternoon for GMZ538-555-557-575-577.

Small Craft Advisory until 7am CDT Thursday for GMZ538-555-557- 575-577.

Small Craft Advisory until 4pm CDT Friday for GMZ532-534.