Marine Weather Net

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


TONIGHT

N
WINDS
20
KNOTS

FRIDAY

N
WINDS
20 - 25
KNOTS

FRIDAY NIGHT

N
WINDS
20 - 25
KNOTS

SATURDAY

N
WINDS
15 - 20
KNOTS

The Marine Weather Forecast In Detail:
GMZ575 Forecast Issued: 341 PM CST Thu Nov 14 2019

SMALL CRAFT ADVISORY IN EFFECT THROUGH FRIDAY AFTERNOON
Tonight...North Winds Near 20 Knots. Seas 3 To 6 Feet With Occasional Seas To 8 Feet. Dominant Period 6 Seconds. Chance Of Light Rain Early In The Evening.
Friday...North Winds 20 To 25 Knots. Seas 4 To 7 Feet With Occasional Seas To 9 Feet. Dominant Period 6 Seconds.
Friday Night...North Winds 20 To 25 Knots. Seas 4 To 7 Feet With Occasional Seas To 9 Feet. Dominant Period 6 Seconds.
Saturday...North Winds 15 To 20 Knots. Seas 3 To 5 Feet. Dominant Period 5 Seconds.
Saturday Night...Northeast Winds 10 To 15 Knots. Seas 2 To 4 Feet. Dominant Period 4 Seconds.
Sunday...Northwest Winds 5 To 10 Knots. Seas 1 To 2 Feet. Dominant Period 4 Seconds.
Sunday Night...Northwest Winds 10 To 15 Knots. Seas 2 To 4 Feet. Dominant Period 4 Seconds. Slight Chance Of Light Rain After Midnight.
Monday...Northwest Winds 10 To 15 Knots. Seas 2 To 4 Feet. Dominant Period 4 Seconds. Slight Chance Of Light Rain In The Morning.
Monday Night...Northwest Winds 10 To 15 Knots. Seas 2 To 4 Feet. Dominant Period 4 Seconds.
Tuesday...Northwest Winds 10 To 15 Knots. Seas 2 To 4 Feet.
Tuesday Night...North Winds 10 To 15 Knots. Seas 2 To 4 Feet.
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Synopsis for Pascagoula to SW Pass Mississippi - GMZ501
Synopsis for SW Pass Mississippi River to Atchafalaya River- GMZ500
341 PM CST Thu Nov 14 2019

An upper level disturbance and associated weak area of surface low pressure over the west gulf will move rapidly eastward across the central gulf tonight. High pressure will then rebuild into the northwest Gulf Friday and settle across the eastern U.S. through the weekend into early next week.
Area Forecast Discussion
National Weather Service New Orleans LA
248pm CST Thu Nov 14 2019

Short Term
Region covered by extensive cloud cover and mostly stratiform rain with embedded convective features from high based nimbus decks. This is in response to weak area of low pressure, about 1018 mb, over the west gulf this afternoon. There is a 8 mb gradient between it and surface high situated near Monroe, LA, providing a large scale isentropic shallow slope to support the rain process this afternoon. The low pressure circulation becomes suppressed as new surge of cold air builds southward into the gulf this evening, shutting off the over-running upglide. Rain should come to an end for all areas by midnight. Lows to remain at or above freezing tonight and below daily normals as cold pool(a region of relatively cold air) trough swings through. High pressure axis pretty much stays parked over the middle and lower MS River Valley Friday into Saturday with dry and cold to cool temperatures to prevail.

Long Term
There appears to be an extended period of cool and dry days well into next week as high pressure area slowly moderates. Another southern branch impulse enters the west gulf Monday but models want to suppress it well south of the forecast area as upper level trough amplifies over the eastern U.S. ECMWF (European Centre for Medium-Range Weather Forecasts) does show some convective response to upper level forcing on a diving impulse, but it would be bringing its own moisture and does appear to be limited with no return flow enhancement to augment. Will maintain low end Probability of Precipitation during that period, otherwise, it rather dry forecast through the extended period. Some slow veering to onshore flow around next Thursday may impart a shot at sea fog considerations with warm moisture advection over what is now cooling coastal waters.

Marine
Offshore flow regime to remain in place the entire forecast period with some gradient enhancement to N-NE winds this evening and again Monday night into early Tuesday as surface reflections of upper level disturbances traverse the central and lower gulf waters.

NOAA New Orleans LA Office: Watches - Warnings - Advisories
LA...None. GM...Small Craft Advisory from 6pm this evening to 6pm CST Friday for GMZ550-552-570-572.

Small Craft Advisory until 6pm CST Friday for GMZ536-538-555- 557-575-577.

MS...None. GM...Small Craft Advisory from 6pm this evening to 6pm CST Friday for GMZ552-570-572.

Small Craft Advisory until 6pm CST Friday for GMZ538-555-557- 575-577.