Marine Weather and Tide Forecast for St. Martin, MS

LONG TERM
(Thursday night through Tuesday)
Issued at 310 AM CDT Wed Apr 23 2025

Ridging is expected to build across the western Gulf and southern Plains Friday and Saturday, and across much of the Mississippi and Ohio River Valleys over the weekend into early next week. This will help the airmass dry out somewhat, with precipitable water values falling off to around 1 inch for Friday through at least Monday before increasing slightly by Tuesday. Any thunderstorm development during that period looks to be isolated in coverage, if any develops at all. High temperatures are likely to be in the mid and upper 80s away from the immediate coast, where sea breezes may cap off heating at midday. Won't rule out a few spots reaching 90, perhaps on Sunday, although the 91 in the MEX numbers at PQL looks a little out of place unless there is an offshore wind.
Little day to day change in overnight lows.

AVIATION
(18Z TAFS)
Issued at 1234 PM CDT Wed Apr 23 2025

Convective activity will be displaced toward BTR and MCB this afternoon as a weak boundary continues to slowly shift further inland. PROB30 wording for the thunderstorm threat is included generally between 18z and 02z at these terminals with prevailing MVFR restrictions. After 02z, the loss of daytime heating should allow the convection to dissipate and a brief period of prevailing VFR conditions will take hold. However, the development of another inversion that will gradually strengthen through the night will allow for another round of low stratus to form between 07z and 12z. This will lead to a mix of IFR and MVFR ceilings ranging from 500 to 1500 feet at all of the terminals. MCB and BTR are expected to see the lowest ceilings and some fog will also form, especially at MCB, between 10z and 14z. After 14z, increased mixing of the boundary layer will allow the inversion to lift and prevailing MVFR and VFR conditions to take hold at all of the terminals by 16z. PG

AVIATION
(12Z TAFS)
Issued at 632 AM CDT Wed Apr 23 2025

IFR or lower conditions at KHUM, KMCB and KBTR are expected to improve quickly around 14z to MVFR and then VFR by midday.
Scattered TSRA could impact KBTR, KMCB, KHDC, KASD and KHUM this afternoon, and have used PROB30 for those. Threat is non-zero elsewhere, but too low to carry in the TAF. IFR conditions will again be possible around sunrise Thursday, but threat not quite as high as this morning.

MARINE
Issued at 310 AM CDT Wed Apr 23 2025

Aside from the potential for thunderstorms over the protected waters during the next 36 hours or so, favorable conditions for maritime operations are expected. Onshore flow is likely to continue through the period with wind speeds for the most part remaining near 10 knots or less.

PRELIMINARY POINT TEMPS/POPS
MCB 65 84 65 86 / 40 10 0 30 BTR 67 86 67 87 / 40 10 0 30 ASD 67 84 67 86 / 30 10 0 10 MSY 70 84 70 86 / 30 10 0 10 GPT 68 81 68 82 / 20 10 0 10 PQL 65 83 65 84 / 10 10 0 10

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