Marine Weather and Tide Forecast for Bay St. Louis, MS
April 21, 2025 6:28 AM CDT (11:28 UTC) Change Location
![]() | Sunrise 6:20 AM Sunset 7:29 PM Moonrise 2:28 AM Moonset 12:58 PM |
GMZ532 Mississippi Sound- 331 Am Cdt Mon Apr 21 2025
Today - Southeast winds around 10 knots. Waves around 2 feet. A chance of showers and Thunderstorms, mainly this afternoon.
Tonight - Southeast winds 5 to 10 knots. Waves around 2 feet. A slight chance of showers and Thunderstorms in the evening, then a chance of showers and Thunderstorms after midnight.
Tuesday - South winds 5 to 10 knots. Waves 1 foot or less, then around 2 feet in the afternoon. Showers likely with a chance of Thunderstorms.
Tuesday night - Southeast winds 5 to 10 knots. Waves 1 to 2 feet in the evening, then 1 foot or less.
Wednesday - Southeast winds 5 to 10 knots. Waves 1 foot or less, then around 2 feet in the afternoon. A chance of showers. A slight chance of Thunderstorms in the morning, then a chance of Thunderstorms in the afternoon.
Wednesday night - Southeast winds 5 to 10 knots. Waves 1 to 2 feet.
Thursday - Southeast winds 5 to 10 knots. Waves around 2 feet. A slight chance of showers and Thunderstorms.
Thursday night - Southeast winds 5 to 10 knots. Waves around 2 feet.
Friday - Southeast winds 5 to 10 knots. Waves around 2 feet.
Friday night - Southeast winds 5 to 10 knots. Waves around 2 feet in the evening, then 1 foot or less.
winds and waves higher in and near Thunderstorms.
winds and waves higher in and near Thunderstorms.
GMZ500 331 Am Cdt Mon Apr 21 2025
Synopsis for pascagoula to atchafalaya river out 60 nm -
an onshore flow will remain through the next week. Winds will likely remain below 15 knots through the week outside of Thunderstorms.
an onshore flow will remain through the next week. Winds will likely remain below 15 knots through the week outside of Thunderstorms.
7 Day Forecast for Marine Location Near Bay St. Louis, MS

NEW! Add second zone forecast
Bay St. Louis Click for Map Mon -- 02:28 AM CDT Moonrise Mon -- 05:37 AM CDT -0.12 feet Low Tide Mon -- 06:23 AM CDT Sunrise Mon -- 12:58 PM CDT Moonset Mon -- 06:26 PM CDT 1.52 feet High Tide Mon -- 07:28 PM CDT Sunset Tide / Current data from XTide NOT FOR NAVIGATION |   |
Bay St. Louis, Mississippi, Tide feet
12 am |
0.7 |
1 am |
0.5 |
2 am |
0.3 |
3 am |
0.1 |
4 am |
-0 |
5 am |
-0.1 |
6 am |
-0.1 |
7 am |
-0.1 |
8 am |
0.1 |
9 am |
0.2 |
10 am |
0.4 |
11 am |
0.6 |
12 pm |
0.8 |
1 pm |
1 |
2 pm |
1.2 |
3 pm |
1.3 |
4 pm |
1.4 |
5 pm |
1.5 |
6 pm |
1.5 |
7 pm |
1.5 |
8 pm |
1.5 |
9 pm |
1.4 |
10 pm |
1.3 |
11 pm |
1.1 |
Cat Island (West Point) Click for Map Mon -- 02:27 AM CDT Moonrise Mon -- 04:19 AM CDT -0.32 feet Low Tide Mon -- 06:22 AM CDT Sunrise Mon -- 12:57 PM CDT Moonset Mon -- 04:49 PM CDT 1.70 feet High Tide Mon -- 07:28 PM CDT Sunset Tide / Current data from XTide NOT FOR NAVIGATION |   |
Cat Island (West Point), Mississippi, Tide feet
12 am |
0.3 |
1 am |
0 |
2 am |
-0.1 |
3 am |
-0.3 |
4 am |
-0.3 |
5 am |
-0.3 |
6 am |
-0.2 |
7 am |
-0.1 |
8 am |
0.1 |
9 am |
0.4 |
10 am |
0.6 |
11 am |
0.8 |
12 pm |
1.1 |
1 pm |
1.3 |
2 pm |
1.5 |
3 pm |
1.6 |
4 pm |
1.7 |
5 pm |
1.7 |
6 pm |
1.7 |
7 pm |
1.6 |
8 pm |
1.4 |
9 pm |
1.2 |
10 pm |
1 |
11 pm |
0.8 |
Area Discussion for New Orleans/Baton Rouge, LA
Hide  HelpNOTE: mouseover dotted underlined text for definition
FXUS64 KLIX 210825 AFDLIX
Area Forecast Discussion National Weather Service New Orleans LA 325 AM CDT Mon Apr 21 2025
New SHORT TERM, LONG TERM, MARINE
SHORT TERM
(Today through Tuesday)
Issued at 320 AM CDT Mon Apr 21 2025
Upper ridging anchored off the Atlantic Coast this morning. A negatively tilted shortwave was moving through Iowa early this morning, with a secondary shortwave off the Texas coast. At the surface, low pressure over southwest Wisconsin had a frontal boundary southwestward to the ArkLaTex and then to the Rio Grande Valley. Radar and surface reports indicated a few light rain showers over southeast Louisiana and coastal Mississippi, although rain amounts weren't much more than barely wetting the ground in most places. Temperatures were between 70 and 75 early this morning with dew points between 68 and 71.
The upper ridge isn't going much of anywhere through Tuesday, although the shortwave near the Texas coast this morning will lift northeastward to near Charlotte by Tuesday evening. The frontal boundary to our northwest will gradually stretch out more east- west to our north over the next 36 hours, close to Interstate 20.
Precipitable water values that were around 1.3 inches Sunday evening will increase to about 1.6 this afternoon, which is around the 90th percentile climatologically for this time of year. Those moisture levels will remain in place through Tuesday afternoon.
It may take until afternoon today for moisture to become deep enough to produce anything more than light rain showers, though.
While instability is sufficient for thunderstorms, and lapse rates are sufficient, shear is lacking, generally 20 knots or less. With 500 mb temperatures around -13C, that would indicate some potential for hail. Cannot entirely rule out a few storms approaching severe limits this afternoon, mainly across northern and western portions of the area, closer to the frontal boundary.
While organized forcing may be lacking on Tuesday afternoon, convective temperatures may be a couple degrees lower. Over the next 36 hours, most areas should see at least some rain. If a location gets multiple storms, brief drainage issues are possible, but it's been almost 2 weeks since much of the local area has had any significant rainfall.
Temperature guidance is pretty consistent and major adjustments aren't necessary. Guidance lows may be a shade on the cool side, but probably not enough to chase.
LONG TERM
(Tuesday night through Sunday)
Issued at 320 AM CDT Mon Apr 21 2025
Moisture levels will remain sufficient for thunderstorm development on Wednesday before drying out somewhat for the end of the week for much of the area as ridging builds in again from the west. The operational GFS is a bit more bullish on the ridging than the ECMWF. The operational ECMWF from the 12z run was on the wetter side of their ensemble, so the NBM favoring a bit drier solution fits toward the weekend. As is the case early in the week, timing of most of the precipitation is likely to be during the afternoon hours, possibly lingering into the early evening a bit.
Temperature guidance is consistent from day to day on highs and lows, with no significant adjustments made.
AVIATION
(06Z TAFS)
Issued at 1210 AM CDT Mon Apr 21 2025
All terminals are in MVFR or almost there already. Cigs have been falling all evening and BKN to OVC skies around 1200-1500 are likely going to stay if not lower dropping a few sites into IFR status through 15/16z. A few sprinkles or lights shra can not be ruled out overnight but the bulk of the rain will hold off until the midday and afternoon hours Monday. /CAB/
MARINE
Issued at 320 AM CDT Mon Apr 21 2025
Main concerns for the marine community over the next 5 days will be the threat of thunderstorms, as the pressure gradient isn't expected to be sufficient to produce persistent winds above 15 knots. Thunderstorms could produce locally higher winds and waves, especially during the first half of the week.
PRELIMINARY POINT TEMPS/POPS
MCB 82 65 84 65 / 80 40 70 20 BTR 85 67 85 66 / 60 20 70 10 ASD 83 67 84 66 / 60 30 60 10 MSY 83 70 83 69 / 50 30 60 10 GPT 80 68 80 67 / 40 30 60 10 PQL 82 66 82 66 / 20 20 60 10
LIX WATCHES/WARNINGS/ADVISORIES
LA...None.
GM...None.
MS...None.
GM...None.
Area Forecast Discussion National Weather Service New Orleans LA 325 AM CDT Mon Apr 21 2025
New SHORT TERM, LONG TERM, MARINE
SHORT TERM
(Today through Tuesday)
Issued at 320 AM CDT Mon Apr 21 2025
Upper ridging anchored off the Atlantic Coast this morning. A negatively tilted shortwave was moving through Iowa early this morning, with a secondary shortwave off the Texas coast. At the surface, low pressure over southwest Wisconsin had a frontal boundary southwestward to the ArkLaTex and then to the Rio Grande Valley. Radar and surface reports indicated a few light rain showers over southeast Louisiana and coastal Mississippi, although rain amounts weren't much more than barely wetting the ground in most places. Temperatures were between 70 and 75 early this morning with dew points between 68 and 71.
The upper ridge isn't going much of anywhere through Tuesday, although the shortwave near the Texas coast this morning will lift northeastward to near Charlotte by Tuesday evening. The frontal boundary to our northwest will gradually stretch out more east- west to our north over the next 36 hours, close to Interstate 20.
Precipitable water values that were around 1.3 inches Sunday evening will increase to about 1.6 this afternoon, which is around the 90th percentile climatologically for this time of year. Those moisture levels will remain in place through Tuesday afternoon.
It may take until afternoon today for moisture to become deep enough to produce anything more than light rain showers, though.
While instability is sufficient for thunderstorms, and lapse rates are sufficient, shear is lacking, generally 20 knots or less. With 500 mb temperatures around -13C, that would indicate some potential for hail. Cannot entirely rule out a few storms approaching severe limits this afternoon, mainly across northern and western portions of the area, closer to the frontal boundary.
While organized forcing may be lacking on Tuesday afternoon, convective temperatures may be a couple degrees lower. Over the next 36 hours, most areas should see at least some rain. If a location gets multiple storms, brief drainage issues are possible, but it's been almost 2 weeks since much of the local area has had any significant rainfall.
Temperature guidance is pretty consistent and major adjustments aren't necessary. Guidance lows may be a shade on the cool side, but probably not enough to chase.
LONG TERM
(Tuesday night through Sunday)
Issued at 320 AM CDT Mon Apr 21 2025
Moisture levels will remain sufficient for thunderstorm development on Wednesday before drying out somewhat for the end of the week for much of the area as ridging builds in again from the west. The operational GFS is a bit more bullish on the ridging than the ECMWF. The operational ECMWF from the 12z run was on the wetter side of their ensemble, so the NBM favoring a bit drier solution fits toward the weekend. As is the case early in the week, timing of most of the precipitation is likely to be during the afternoon hours, possibly lingering into the early evening a bit.
Temperature guidance is consistent from day to day on highs and lows, with no significant adjustments made.
AVIATION
(06Z TAFS)
Issued at 1210 AM CDT Mon Apr 21 2025
All terminals are in MVFR or almost there already. Cigs have been falling all evening and BKN to OVC skies around 1200-1500 are likely going to stay if not lower dropping a few sites into IFR status through 15/16z. A few sprinkles or lights shra can not be ruled out overnight but the bulk of the rain will hold off until the midday and afternoon hours Monday. /CAB/
MARINE
Issued at 320 AM CDT Mon Apr 21 2025
Main concerns for the marine community over the next 5 days will be the threat of thunderstorms, as the pressure gradient isn't expected to be sufficient to produce persistent winds above 15 knots. Thunderstorms could produce locally higher winds and waves, especially during the first half of the week.
PRELIMINARY POINT TEMPS/POPS
MCB 82 65 84 65 / 80 40 70 20 BTR 85 67 85 66 / 60 20 70 10 ASD 83 67 84 66 / 60 30 60 10 MSY 83 70 83 69 / 50 30 60 10 GPT 80 68 80 67 / 40 30 60 10 PQL 82 66 82 66 / 20 20 60 10
LIX WATCHES/WARNINGS/ADVISORIES
LA...None.
GM...None.
MS...None.
GM...None.
Stations | Dist | Age | Wind | Air | Water | Waves | inHg | DewPt |
WYCM6 - 8747437 - Bay Waveland Yacht Club, MS | 1 mi | 59 min | SSE 11G | 81°F | 75°F | 30.06 | ||
SHBL1 - 8761305 - Shell Beach, LA | 36 mi | 59 min | ESE 5.1G | 73°F | 67°F | 30.09 | ||
PNLM6 - 8741533 - Pascagoula NOAA Lab, MS | 41 mi | 59 min | 74°F | |||||
42067 - USM3M02 | 43 mi | 139 min | ENE 9.7G | 74°F | 5 ft | 30.08 | 71°F | |
PTBM6 - 8741003 - Petit Bois Island, MS | 44 mi | 59 min | SE 7G | 72°F | 30.10 | |||
NWCL1 - 8761927 - New Canal, LA | 46 mi | 59 min | SSE 4.1G | 72°F | 30.08 | |||
GDXM6 - Grand Bay Reserve, MS | 48 mi | 104 min | ESE 6 | 74°F | 30.12 | 71°F |
Wind History for Bay Waveland Yacht Club, MS
toggle option: (graph/table)
Airport Reports
Link to 1 hour of 5 minute data for KHSA
Terminal Aerodrome Forecast (TAF) for KHSA
Wind History Graph: HSA
(wind in knots)GEOS Local Image of Southern Mississippi Valley
Edit Hide
New Orleans/Baton Rouge, LA,

NOTICE: Some pages have affiliate links to Amazon. As an Amazon Associate, I earn from qualifying purchases. Please read website Cookie, Privacy, and Disclamers by clicking HERE. To contact me click HERE. For my YouTube page click HERE