Marine Weather Net

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


TONIGHT

W
WINDS
5 - 10
KNOTS

TUESDAY

NW
WINDS
5 - 10
KNOTS

TUESDAY NIGHT

W
WINDS
5 - 10
KNOTS

WEDNESDAY

SW
WINDS
5 - 10
KNOTS

The Marine Weather Forecast In Detail:
GMZ575 Forecast Issued: 342 PM CDT Mon Aug 03 2020

Tonight...West Winds 5 To 10 Knots. Seas 1 To 2 Feet. Dominant Period 4 Seconds.
Tuesday...Northwest Winds 5 To 10 Knots. Seas 1 To 2 Feet. Dominant Period 4 Seconds.
Tuesday Night...West Winds 5 To 10 Knots. Seas 1 Foot Or Less. Dominant Period 4 Seconds.
Wednesday...Southwest Winds 5 To 10 Knots. Seas 1 Foot Or Less. Dominant Period 4 Seconds.
Wednesday Night...Southwest Winds 5 To 10 Knots. Seas 1 Foot Or Less. Dominant Period 4 Seconds.
Thursday...Southwest Winds Near 5 Knots Becoming Southeast In The Late Morning And Afternoon. Seas 1 Foot Or Less. Dominant Period 4 Seconds.
Thursday Night...South Winds 5 To 10 Knots. Seas 1 Foot Or Less. Dominant Period 4 Seconds.
Friday...South Winds Near 5 Knots Becoming Southeast In The Late Morning And Afternoon. Seas 1 Foot Or Less. Dominant Period 4 Seconds. Chance Of Showers And Thunderstorms Through The Day.
Friday Night...South Winds 5 To 10 Knots. Seas 1 Foot Or Less. Dominant Period 4 Seconds. Slight Chance Of Showers And Thunderstorms After Midnight.
Saturday...South Winds Near 5 Knots Becoming Southeast In The Late Morning And Afternoon. Seas 1 Foot Or Less. Dominant Period 7 Seconds. Chance Of Showers And Thunderstorms Through The Day.
Saturday Night...Southwest Winds 5 To 10 Knots. Seas 1 Foot Or Less. Dominant Period 7 Seconds.
SHARE THIS PAGE:           
Synopsis for Pascagoula to SW Pass Mississippi - GMZ501
Synopsis for SW Pass Mississippi River to Atchafalaya River- GMZ500
342 PM CDT Mon Aug 3 2020

Weak high pressure will remain in place over the Gulf through the work week.
Area Forecast Discussion
National Weather Service New Orleans LA
343pm CDT Monday August 3 2020

Long wave upper trough remains in place across the eastern half of the CONUS. Subsident northwest flow has resulted in drying throughout much of the column. Local 18z sounding indicates significantly drier mid levels compared to same time yesterday. Precipitable water is down to 1.5 inches. Looking out the window I can see CU clouds with somewhat stunted vertical growth, likely due to subsidence inversion around 750mb/8kft. All that being said, it will be difficult for even isolated showers/storms to develop this afternoon.

Model soundings show an even drier sounding for tomorrow, with PW as low as about an inch, which is only about half the normal value for this time of year. Will carry only silent 10 percent POPs to cover for a rogue shower or two, but point probabilities are definitely too low to mention any showers or thunderstorms in the forecast itself. Forecasting afternoon highs in the low to mid 90s and this may be underdone considering lack of convection and drier air mass. Afternoon dewpoints are generally forecast in the upper 60s and lower 70s which is also below normal for this time of year, and should keep afternoon heat index values in check.

The trough will slowly move eastward and flatten through the second half of the week, with a gradually moistening column. Expect temperatures to be within a few degrees of normal through the week. Isolated to widely scattered showers could return to coastal areas as early as Wednesday or Thursday, but a return to more normal afternoon showers and thunderstorms isn't expected until over the weekend.

Marine
Generally benign conditions expected to persist across the coastal waters through the week. Outside of a few nigheights when winds could briefly bump up just a bit higher, expect winds to stay in the 5-10kt range with wave heigheights generally 2 ft or less.

NOAA New Orleans LA Office: Watches - Warnings - Advisories
LA...None. GM...None. MS...None. GM...None.