Marine Weather and Tide Forecast for Gretna, LA

LONG TERM
(Friday through Monday night)
Issued at 254 PM CDT Tue Apr 22 2025

Conditions will begin to shift on Friday as one final embedded weak vorticity maxima passes through the region in advance of a building ridge axis over the southern Plains. Diurnal convection will once again form, but increasing negative vorticity advection ahead of the approaching ridge will increase the mid-level capping inversion will keep the coverage more isolated to widely scattered Friday afternoon. With less cloud development a bit more subsidence in place, temperatures will further warm with highs in the mid 80s expected.

Further warming will take place this weekend into early next week as the deep layer ridge axis becomes firmly entrenched across the central Gulf coast. Strong deep layer subsidence will not only restrict most cloud development, but also allow temperatures to climb a good 10 degrees above average in the upper 80s and lower 90s on Saturday, Sunday, and Monday. Persistent onshore flow through the period will keep dewpoints elevated and conditions very muggy. These higher dewpoints will support heat index values in the low to even mid 90s over a large portion of the forecast area. Only the coastal zones will see more moderate temperatures as a seabreeze forms each day. The onshore flow will also limit overnight cooling as lows only dip into the upper 60s and lower 70s, and have opted to use the NBM 75th percentile output for each night in the extended period. Given that this heat is coming on very early in the season, everyone needs to ensure they remain hydrated and to seek shade if they are participating in outdoor events.

AVIATION
(06Z TAFS)
Issued at 1143 PM CDT Tue Apr 22 2025

Mixture of VFR to MVFR and lower conditions is forecast for the period. The best chance for MVFR and lower will be overnight due to low ceilings and there is also a threat for fog as well. The overall ceilings will lift slightly during the day but chances of showers and storms will be in the forecast and but conditions would lower if a terminal is impacted by a storm. Otherwise winds remain mostly light and southerly. -BL

MARINE
Issued at 254 PM CDT Tue Apr 22 2025

A very Summer like stretch of largely benign weather conditions will be in place across the coastal waters through the weekend and into early next week. A persistent high pressure system parked over the eastern Gulf will keep southeast flow of around 10 knots in place. This will result in seas of 2 to 4 feet through the period. No significant concerns for maritime operations are anticipated.

PRELIMINARY POINT TEMPS/POPS
MCB 65 84 65 84 / 20 50 40 40 BTR 67 84 68 85 / 20 50 40 40 ASD 68 83 68 83 / 10 40 10 20 MSY 69 83 70 83 / 10 30 10 20 GPT 70 80 70 80 / 10 30 10 10 PQL 69 81 68 81 / 10 30 10 10

LIX WATCHES/WARNINGS/ADVISORIES
LA...None.
GM...None.
MS...None.
GM...None.