Marine Weather and Tide Forecast for Port Sulphur, LA

LONG TERM
(Sunday through Wednesday night)
Issued at 314 PM CDT Thu Apr 24 2025

Sunday through Tuesday will be very warm and dry as the deep layer ridge axis remains firmly entrenched across the central Gulf coast. PWATS will remain in the 25th percentile range and temperatures will easily climb into the upper 80s over much of the area. Dewpoints will also remain elevated in the lower 70s and this will support heat index values in the low to mid 90s. The warmest readings will be over inland areas and away from the moderating seabreeze. Overall, conditions will feel more akin to those seen in late May or early June as opposed to late April.

A pattern change in the upper levels will take hold on Wednesday as the ridge axis begins to shift to the east and a vigorous southern stream trough moves into Texas. Although ridging will begin to decrease and PWATS will climb back to the median for this time of year, a strong mid-level capping inversion will remain in place. This is due to continued influence from the departing ridge keeping dry air in place in the mid-levels. At most, isolated and diurnally forced convection could develop over the far northwest part of the forecast area where slightly lower heights and a weaker capping inversion are expected to be in place. Otherwise, warm and dry conditions will persist as highs climb back into the mid to upper 80s and heat indices rise back into the lower 90s.

AVIATION
(18Z TAFS)
Issued at 314 PM CDT Thu Apr 24 2025

Scattered convective activity will be the primary concern through 00z, but the risk of convective impacts is too low to include at most of the terminals. BTR is the outlier as a line of showers and weak thunderstorms is in close proximity to the airport currently.
This line of convection will gradually move further east of the airport and have VCTS wording ending at 19z. Otherwise, a mix of MVFR and VFR ceilings ranging from 1500 to 3500 feet will be in place at the terminals. Tonight, a weak inversion will allow for some fog and low stratus to form over the more inland terminals with IFR conditions forecast for BTR and MCB between 10z and 14z.
MVFR ceilings will be in place at the remainder of the terminals as boundary layer conditions remains more mixed closer to the coast. After 14z, rapid improvement in conditions is expected as the inversion breaks amid warming surface temperatures.

MARINE
Issued at 314 PM CDT Thu Apr 24 2025

No significant impacts to maritime activities are expected through early next week. High pressure will be centered directly over or just to the east of the waters through the period, and this will result in light winds of around 10 knots and seas of 1 to 3 feet on average.

PRELIMINARY POINT TEMPS/POPS
MCB 68 84 66 86 / 20 50 30 20 BTR 69 85 67 86 / 20 40 30 10 ASD 69 84 68 86 / 10 30 20 10 MSY 72 84 71 85 / 10 20 20 10 GPT 71 81 69 82 / 10 10 10 10 PQL 69 81 69 84 / 10 10 0 10

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