Southwest Pass of the Mississippi River to Port Fourchon, LA 20 - 60 NM Marine Forecast
| Today...South Winds 5 To 10 Knots. Seas 1 To 3 Feet. Dominant Period 5 Seconds. Chance Of Showers And Thunderstorms. |
| Tonight...South Winds 5 To 10 Knots. Seas 2 To 4 Feet. Dominant Period 6 Seconds. Chance Of Showers And Thunderstorms Through The Night. |
| Friday...South Winds 5 To 10 Knots. Seas 2 To 4 Feet. Dominant Period 6 Seconds. Showers And Thunderstorms In The Morning, Then Showers And Thunderstorms Likely In The Afternoon. |
| Friday Night...Southeast Winds 5 To 10 Knots. Seas 1 To 3 Feet. Dominant Period 5 Seconds. Chance Of Showers And Thunderstorms. |
| Saturday...Southeast Winds 5 To 10 Knots. Seas 1 To 2 Feet. Dominant Period 5 Seconds. Showers And Thunderstorms Likely In The Morning, Then Chance Of Showers And Thunderstorms In The Afternoon. |
| Saturday Night...South Winds 5 To 10 Knots. Seas 1 To 2 Feet. Dominant Period 5 Seconds. Chance Of Showers And Thunderstorms In The Evening, Then Showers And Thunderstorms Likely After Midnight. |
| Sunday...Southwest Winds 5 To 10 Knots. Seas 1 To 2 Feet. Dominant Period 5 Seconds. Showers And Thunderstorms Likely In The Morning, Then Chance Of Showers And Thunderstorms In The Afternoon. |
| Sunday Night...Southwest Winds 5 To 10 Knots. Seas 1 To 2 Feet. Dominant Period 4 Seconds. Chance Of Showers And Thunderstorms. |
| Monday...Southwest Winds Near 10 Knots. Seas 1 To 2 Feet. Dominant Period 4 Seconds. Showers And Thunderstorms Likely. |
| Monday Night...South Winds Near 10 Knots. Seas 1 Foot Or Less. Dominant Period 4 Seconds. Chance Of Showers And Thunderstorms. |
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Synopsis for Pascagoula to SW Pass Mississippi - GMZ501 Synopsis for SW Pass Mississippi River to Atchafalaya River- GMZ500 358 AM CDT Thu Aug 22 2019 Ridge extension of Bermuda high pressure area across the northeast Gulf of Mexico will persist through the weekend. An unsettled pattern will provide periods of thunderstorms over the coastal waters through Monday. |
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Area Forecast Discussion National Weather Service New Orleans LA 501am CDT Thu August 22 2019 Short Term - Today Through Saturday The moist summer pattern will continue, although today should be a slight reprieve from the higher rain coverage of the last couple days. A Bermuda ridge pattern will dominate the central Gulf coast region with fairly typical, scattered diurnal showers and thunderstorms expected with daytime heating. Of interest in the tropics, A trough of low pressure over the Bahamas may try to get better organized by this weekend as the system approaches the Florida peninsula, however this system will not have impacts to the central Gulf coast region. Of more interest locally, satellite imagery shows a well defined mid/upper level low over the southwest Gulf of Mexico that is moving northwest. The models are in decent agreement taking this low/trough northwest then north today through Friday across the western Gulf reaching off the Texas coast by Friday afternoon. This should bring another surge of deeper tropical moisture into the forecast area on Friday, so have maintained the high rain chances from the previous forecast. The Weather Prediction Center has kept most of the area in a marginal risk of excessive rainfall on Friday and the pattern definitely supports locally very heavy rainfall amounts that may result in ponding of water and some flooding. A few stronger thunderstorms producing frequent lightning and gusty winds may also occur mainly during afternoon hours today and tomorrow. On Saturday, a shortwave trough moving east across the northern and central Plains region is expected to have enough westerly flow down to the Red River valley area to cause the mid level low/trough to drift north to northeast near the upper Texas and southwest Louisiana coast on Saturday and Saturday night. The ECMWF builds the low pressure area or a trough down to 850 mb by Saturday evening. This will likely continue to keep the forecast area in deeper tropical moisture that will support high rain chances along with locally heavy rainfall. Long Term - Sunday through Wednesday A low or trough of low pressure from the mid levels down to 850 mb should drift northeast to east near or over southeast Louisiana on Sunday. Once again, this will maintain deep tropical moisture and a favorable environment for fairly widespread rainfall and a threat of locally very heavy downpours from heavier showers and thunderstorms. This system should finally start to exit the region on Monday, however there will still be deep tropical moisture over the region to support scattered to numerous showers and thunderstorms. In fact, it should remain a fairly wet pattern with scattered showers and thunderstorms Tuesday into Wednesday as a frontal boundary will start to approach the region from the north as a fairly potent series of shortwave troughs carve out a broader mid/upper level trough across the upper to mid Mississippi valley and Great Lakes region. 22/TD Marine Discussion Overall weather pattern will continue to remain unsettled across marine zones, thanks to a weak inverted trough across southern and central Louisiana. Expect spotty shower/storm chances through the next several days, with better coverage in the overnight hours. Main threats in any one storm will be gusty downdraft winds in excess of 25-35 knots and lightning. This pattern should continue through the weekend and early next week. KLG/35 NOAA New Orleans LA Office: Watches - Warnings - Advisories LA...None. GM...None. MS...None. GM...None. |
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