Southwest Pass of the Mississippi River to Port Fourchon Louisiana Marine Forecast
|Tonight...East Winds Near 15 Knots. Seas 3 To 5 Feet With Occasional Seas To 6 Feet. Dominant Period 7 Seconds.|
|Monday...East Winds 15 To 20 Knots. Seas 3 To 6 Feet. Dominant Period 7 Seconds. Chance Of Showers And Thunderstorms.|
|Monday Night...East Winds 15 To 20 Knots. Seas 3 To 6 Feet With Occasional Seas To 8 Feet. Dominant Period 7 Seconds. Slight Chance Of Thunderstorms Early In The Evening. Slight Chance Of Showers Through The Night. Slight Chance Of Thunderstorms After Midnight.|
|Tuesday...Southeast Winds 10 To 15 Knots. Seas 3 To 5 Feet. Dominant Period 7 Seconds. Slight Chance Of Showers And Thunderstorms Through The Day.|
|Tuesday Night...Southeast Winds 5 To 10 Knots. Seas 2 To 4 Feet. Dominant Period 7 Seconds. Chance Of Showers And Thunderstorms After Midnight.|
|Wednesday...Southwest Winds 10 To 15 Knots. Seas 2 To 4 Feet. Dominant Period 6 Seconds. Showers And Thunderstorms Likely.|
|Wednesday Night...South Winds 10 To 15 Knots. Seas 2 To 4 Feet. Dominant Period 6 Seconds. Chance Of Showers And Thunderstorms.|
|Thursday...South Winds 10 To 15 Knots. Seas 2 To 4 Feet. Dominant Period 6 Seconds. Showers And Thunderstorms Likely In The Morning, Then Chance Of Showers And Thunderstorms In The Afternoon.|
|Thursday Night...South Winds 10 To 15 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. Chance Of Showers And Thunderstorms Through The Day.|
|Friday Night...Southeast Winds 5 To 10 Knots. Seas 1 To 2 Feet. Dominant Period 5 Seconds. Slight Chance Of Showers And Thunderstorms After Midnight.|
Synopsis for Pascagoula to SW Pass Mississippi - GMZ501|
Synopsis for SW Pass Mississippi River to Atchafalaya River- GMZ500
358 PM CDT Sun May 24 2020
Weak high pressure will remain over much of the central to northeast Gulf coast and southeast U.S. through early in the upcoming week. A tropical wave will impact the area tonight through Monday night as it moves north across the eastern Gulf. As the wave moves out of the area high pressure will setup over the mid-Atlantic by the middle of next week and extend into the north central gulf.
Area Forecast Discussion|
National Weather Service New Orleans LA
433pm CDT Sunday May 24 2020
.SHORT TERM (Tonight through Wednesday)... The low to mid level ridge extending from the western Atlantic across the eastern to central Gulf coast will gradually lift northward across the southeast states through Monday. An inverted trough/tropical wave expected to move north across the eastern Gulf of Mexico/Florida peninsula region tonight through Tuesday. At the same time, a longwave trough will be advancing east from the western U.S. into the Plains region with a southern extension of a trough down around the Rio Grande area. This mid/upper trough will become a closed, stacked low that should slowly advance east and then stall/meander near the Red River Valley/east Texas area Tuesday night into Wednesday. The combination of the persistent feed of moisture from the Gulf, warm temperatures and shortwave trough/convergence features will keep the daily chances of showers and thunderstorms in the forecast. Today has seen a lull in activity with only isolated showers and thunderstorms thus far this afternoon, however coverage is expected to increase back to scattered coverage Memorial Day and scattered to numerous on Tuesday. Higher rain chances and precipitation amounts will be more in western areas near Baton Rouge and the Atchafalaya River with lower rainfall in the farther east/coastal areas. While general, expected rainfall amounts during the period are only forecast to be around an inch in western areas to 1/4 to 1/2 inch in eastern areas, there could be some bands of much heavier rainfall setting up.
High temperatures will be trending down as they should with the higher rain chances through the period.
.LONG TERM (Thursday through Sunday)... The low pressure system is expected to gradually weaken and open up into move of a positively tilted shortwave trough by late in the week and over the weekend as it either moves into the forecast area or possibly retrogrades back west into the Arklatex to south Texas region by the weekend. Regardless of what happens later in the period, heavy rainfall and flooding will likely be a concern Wednesday night into Thursday. The presence of the low or trough and the high moisture content will keep elevated rain chances through the period, but the Probability of Precipitation should be lowering slightly each day starting Friday.
Easterly winds are expected to rise to 15 to 20 knots over much of the open waters tonight as an inverted trough/tropical wave moves north from the southeast Gulf. This wave is then expected to lift north across the northeast Gulf Monday through Tuesday. Winds are expected to reach around 20 knots over eastern waters Monday into Tuesday with seas up to 7 feet, so have issued a Small Craft Advisory with the afternoon coastal waters forecast. Later in the week, a more typical high pressure ridge over the eastern Gulf coast/southeast states will bring a return of light to moderate south to southeast winds mostly in the near 10 knots or 10 to 15 knots range. Scattered showers and thunderstorms will impact the waters at times into most of next week.
NOAA New Orleans LA Office: Watches - Warnings - Advisories
LA...None. GM...Small Craft Advisory from 10am Monday to 4am CDT Tuesday for GMZ536-538-555-557-575-577.
MS...None. GM...Small Craft Advisory from 10am Monday to 4am CDT Tuesday for GMZ538-555-557-575-577.