Marine Weather and Tide Forecast for St. Martin, MS

LONG TERM
(Thursday through Sunday night)
Issued at 242 PM CDT Mon Apr 21 2025

The combination of a ridge axis gradually building in from the west on Thursday and Friday and the stationary front completely dissipating by Friday will lead to diminishing rain chances each day. Widely scattered diurnally forced shower and thunderstorm activity will once again develop on Thursday, especially for areas north of the I-10/12 corridor where the stalled boundary is expected to be located. This activity will turn more isolated by Friday afternoon as the front dissipates fully and the influence of the ridge strengthens a mid-level capping inversion.
Temperatures will also gradually warm in response to increasing upper level subsidence and greater solar insolation. Highs will climb into the low to mid 80s on Thursday and the mid to upper 80s on Friday.

The ridge axis will be in firm control over the weekend as it expands across the Gulf South. This deep layer ridging will result in very warm and muggy conditions as highs climb into the mid to upper 80s each day and lows only dip into the low to mid 70s. Rain chances will be suppressed due to a strong mid-level capping inversion associated with the deep layer subsidence. With ample sunshine and light southeasterly flow of less than 10 mph in place, heat will be a concern for those partaking in outdoor events. Heat index values will climb into the upper 80s and lower 90s. Although these values are not extreme, the early season nature of this heat and visitors from cooler climates for the outdoor events will present a higher heat illness threat this weekend.

AVIATION
(06Z TAFS)
Issued at 1133 PM CDT Mon Apr 21 2025

Mixture of low VFR to MVFR/IFR conditions is forecast for the period. Low ceilings is forecast and there is some potential for fog especially at MCB. Tomorrow will have on and off showers and thunderstorms during the daytime hours again so individual terminals could have periods of IFR or later depending on storm activity. It should then begin to dissipate after sunset. -BL

MARINE
Issued at 242 PM CDT Mon Apr 21 2025

An almost Summer-like pattern will be in place through the weekend across the coastal waters as a strong high pressure system remains parked across the eastern Gulf. This will keep a southeast flow regime of around 10 knots in place through the entire period. Seas of 2 to 4 feet are also expected through the weekend. Overall, no significant weather concerns for maritime operations are expected through Sunday.

PRELIMINARY POINT TEMPS/POPS
MCB 66 83 65 83 / 50 60 30 70 BTR 67 83 67 84 / 30 60 40 60 ASD 68 83 68 83 / 30 50 30 50 MSY 70 82 70 82 / 20 50 30 40 GPT 71 80 70 79 / 20 50 20 40 PQL 69 81 69 80 / 20 50 20 40

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