Marine Weather Net

Port Fourchon Louisiana to Lower Atchafalaya River Louisiana Marine Forecast


TODAY

NE
WINDS
20 - 25
KNOTS

TONIGHT

NE
WINDS
15 - 20
KNOTS

FRIDAY

E
WINDS
10 - 15
KNOTS

FRIDAY NIGHT

SE
WINDS
10 - 15
KNOTS

The Marine Weather Forecast In Detail:
GMZ550 Forecast Issued: 404 AM CST Thu Jan 28 2021

SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON
Today...Northeast Winds 20 To 25 Knots. Seas 3 To 6 Feet With Occasional Seas To 8 Feet.
Tonight...Northeast Winds 15 To 20 Knots. Seas 3 To 5 Feet.
Friday...East Winds 10 To 15 Knots. Seas 2 To 4 Feet.
Friday Night...Southeast Winds 10 To 15 Knots. Seas 2 To 4 Feet.
Saturday...South Winds 15 To 20 Knots. Seas 3 To 5 Feet With Occasional Seas To 6 Feet.
Saturday Night...Southwest Winds 15 To 20 Knots. Seas 3 To 6 Feet With Occasional Seas To 8 Feet. Slight Chance Of Showers After Midnight.
Sunday...West Winds 15 To 20 Knots. Seas 3 To 6 Feet. Dominant Period 6 Seconds. Chance Of Showers In The Morning.
Sunday Night...North Winds 15 To 20 Knots. Seas 3 To 6 Feet With Occasional Seas To 8 Feet. Dominant Period 7 Seconds.
Monday...North Winds 15 To 20 Knots. Seas 3 To 6 Feet With Occasional Seas To 8 Feet. Dominant Period 4 Seconds.
Monday Night...North Winds 15 To 20 Knots. Seas 3 To 6 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
404 AM CST Thu Jan 28 2021

Strong high pressure with much colder air will remain in place through Friday before moving east over the weekend. Another cold front is expected to move through the central Gulf coast region on Sunday.
Area Forecast Discussion
National Weather Service New Orleans LA
448am CST Thu Jan 28 2021

Short Term
Cold high pressure will continue to build into the area bringing cooler and drier conditions today with highs only rebounding into the middle 50s. Upper level ridge over the central conus will drift eastward throughout the rest of the week. Clear skies and calming winds will alow for near or below freezing conditions on Friday morning. The center of the surface high will begin to move east of the area by Friday afternoon with upper level ridging moving overhead allowing for temperatures to rebound back to near average on Friday with highs mostly in the lower and middle 60s. Ridge moves eastward into the eastern states and Ohio valley by Saturday as a shortwave digs into the Plains, This will bring the next chance of showers by Saturday night and Sunday morning. Recovery will only be modest with dewpoints struggling to get to near 60 by Saturday evening. Meanwhile the surface low will track well to our north through Missouri and the into the Ohio valley thereafter. With that in mind...severe weather is not a threat or concern at this point. In fact it will likely be a non-thunderstorm event with mainly just showers and Quantitative Precipitation Forecast amounts mostly less than an inch Saturday night through Sunday morning. Front will move through Sunday morning bringing cooler and breezy conditions behind it with a gradual decrease in clouds on Sunday with highs holding in the 60s throughout the day. High temperatures on Sunday likely to occur in theam hours. A clear and seasonably cool Sunday night with lows dipping into the 30s interior to 40s south of the lake.

Long Term
Upper low over northern Missouri Saturday evening will move eastward through the Ohio River Valley Sunday and Monday, becoming a nor'easter for New England early next week. The associated surface low will drag a cold front through the area late Saturday night or Sunday morning. Best dynamics for thunderstorms will be well to the north with a mid level cap around 700 mb on the McComb GFSBufr sounding. Never really get into the deeper moisture with dew points currently forecast to remain in 50s. As a comparison, last night, dew points were near 70 in the warm sector. For now, will keep mention of thunder out of the weather grids Saturday night/Sunday morning.

Shortwave ridging builds in for early next week with at least a couple or three dry days. For mid to late week next week, another system moves out of the Rockies. This one takes more of a southwest to northeast track, and is forecast to be in Wisconsin by Thursday night (GFS) or Friday (ECMWF). That'll be just beyond the scope of this forecast package, so won't get into any details.

Sunday temperatures, both morning lows and daytime highs, are going to be dependent on timing of frontal passage. ECMWF (European Centre for Medium-Range Weather Forecasts) looks to be a little on the slow side, so trending a little below those numbers as the blend has, works well. Didn't make any significant shifts in temperature forecast for early next week as guidance spread is not large. 35

Marine
Small craft advisories will continue through noon for all waters through 6am with inner waters extended until noon and outer waters extended until 6 PM. Strong continental cold high pressure will bring strong offshore winds into the waters through the daylight hours today. High pressure will move eastward tomorrow and gradient from Atlantic Low will weaken by tonight and Friday thus winds will relax by tonight. A weakening offshore flow Friday morning will gradually turn to weak return flow by Friday night. Onshore flow will persist through Saturday. A return to offshore flow with winds increasing on Sunday behind the front.

NOAA New Orleans LA Office: Watches - Warnings - Advisories
LA...None. GM...Small Craft Advisory until 6pm CST this evening for GMZ550-552- 555-557-570-572-575-577.

Small Craft Advisory until noon CST today for GMZ532-534-536-538.

Small Craft Advisory until 6am CST early this morning for GMZ530.

MS...None. GM...Small Craft Advisory until 6pm CST this evening for GMZ552-555- 557-570-572-575-577.

Small Craft Advisory until noon CST today for GMZ534-536-538.