Marine Weather and Tide Forecast for Lafitte, LA
April 21, 2025 7:19 AM CDT (12:19 UTC) Change Location
![]() | Sunrise 6:25 AM Sunset 7:32 PM Moonrise 1:30 AM Moonset 12:03 PM |
GMZ538 Expires:202504212130;;192636 Fzus54 Klix 210831 Cwflix
coastal waters forecast national weather service new orleans la 331 am cdt Mon apr 21 2025
pascagoula to atchafalaya river out to 60 nm
seas are provided as a range of the average height of the highest 1/3 of the waves - .along with the occasional height of the average highest 10 percent of the waves.
gmz536-538-212130- chandeleur sound-breton sound- 331 am cdt Mon apr 21 2025
Today - Southeast winds around 10 knots. Waves around 2 feet. A slight chance of showers and Thunderstorms, mainly this afternoon.
Tonight - Southeast winds 5 to 10 knots. Waves 1 foot or less. 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. A chance of showers and Thunderstorms.
Tuesday night - Southeast winds 5 to 10 knots. Waves 1 foot or less.
Wednesday - Southeast winds 5 to 10 knots. Waves 1 foot or less, then around 2 feet in the afternoon. A slight chance of Thunderstorms. A chance of showers, mainly in the morning.
Wednesday night - Southeast winds around 10 knots. Waves 1 foot or less.
Thursday - Southeast winds around 10 knots. Waves around 2 feet. A slight chance of showers and Thunderstorms in the afternoon.
Thursday night - Southeast winds around 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.
coastal waters forecast national weather service new orleans la 331 am cdt Mon apr 21 2025
pascagoula to atchafalaya river out to 60 nm
seas are provided as a range of the average height of the highest 1/3 of the waves - .along with the occasional height of the average highest 10 percent of the waves.
gmz536-538-212130- chandeleur sound-breton sound- 331 am cdt Mon apr 21 2025
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 Lafitte, LA

NEW! Add second zone forecast
Manilla Click for Map Mon -- 02:28 AM CDT Moonrise Mon -- 06:27 AM CDT Sunrise Mon -- 06:36 AM CDT -0.19 feet Low Tide Mon -- 01:03 PM CDT Moonset Mon -- 06:21 PM CDT 1.00 feet High Tide Mon -- 07:30 PM CDT Sunset Tide / Current data from XTide NOT FOR NAVIGATION |   |
Manilla, Mississippi River Delta, Louisiana, Tide feet
12 am |
0.4 |
1 am |
0.3 |
2 am |
0.2 |
3 am |
0 |
4 am |
-0.1 |
5 am |
-0.1 |
6 am |
-0.2 |
7 am |
-0.2 |
8 am |
-0.1 |
9 am |
-0 |
10 am |
0.1 |
11 am |
0.2 |
12 pm |
0.4 |
1 pm |
0.5 |
2 pm |
0.7 |
3 pm |
0.8 |
4 pm |
0.9 |
5 pm |
1 |
6 pm |
1 |
7 pm |
1 |
8 pm |
1 |
9 pm |
0.9 |
10 pm |
0.8 |
11 pm |
0.7 |
Independence Island Click for Map Mon -- 02:28 AM CDT Moonrise Mon -- 05:23 AM CDT -0.17 feet Low Tide Mon -- 06:26 AM CDT Sunrise Mon -- 01:03 PM CDT Moonset Mon -- 06:18 PM CDT 0.91 feet High Tide Mon -- 07:30 PM CDT Sunset Tide / Current data from XTide NOT FOR NAVIGATION |   |
Independence Island, Mississippi River Delta, Louisiana, Tide feet
12 am |
0.3 |
1 am |
0.2 |
2 am |
0 |
3 am |
-0.1 |
4 am |
-0.1 |
5 am |
-0.2 |
6 am |
-0.2 |
7 am |
-0.1 |
8 am |
-0 |
9 am |
0.1 |
10 am |
0.2 |
11 am |
0.3 |
12 pm |
0.4 |
1 pm |
0.5 |
2 pm |
0.7 |
3 pm |
0.8 |
4 pm |
0.8 |
5 pm |
0.9 |
6 pm |
0.9 |
7 pm |
0.9 |
8 pm |
0.9 |
9 pm |
0.8 |
10 pm |
0.7 |
11 pm |
0.6 |
Area Discussion for New Orleans/Baton Rouge, LA
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FXUS64 KLIX 211141 AFDLIX
Area Forecast Discussion National Weather Service New Orleans LA 641 AM CDT Mon Apr 21 2025
New AVIATION
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
(12Z TAFS)
Issued at 635 AM CDT Mon Apr 21 2025
Most terminals reporting MVFR ceilings at forecast issuance time, but a few at the upper end of IFR and KMSY at VFR. Expect primarily MVFR ceilings during the morning hours with some lifting to VFR by midday. Isolated SHRA currently, but anticipate scattered TSRA this afternoon. Will carry PROB30 for now, but amendments may be required if it appears there will be direct impacts to a terminal. Most convection should dissipate with sunset as best forcing remains north and west of our area.
Ceilings will lower again overnight with MVFR to IFR conditions, primarily ceilings, anticipated beyond 06z Tuesday.
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 641 AM CDT Mon Apr 21 2025
New AVIATION
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
(12Z TAFS)
Issued at 635 AM CDT Mon Apr 21 2025
Most terminals reporting MVFR ceilings at forecast issuance time, but a few at the upper end of IFR and KMSY at VFR. Expect primarily MVFR ceilings during the morning hours with some lifting to VFR by midday. Isolated SHRA currently, but anticipate scattered TSRA this afternoon. Will carry PROB30 for now, but amendments may be required if it appears there will be direct impacts to a terminal. Most convection should dissipate with sunset as best forcing remains north and west of our area.
Ceilings will lower again overnight with MVFR to IFR conditions, primarily ceilings, anticipated beyond 06z Tuesday.
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 |
GISL1 - 8761724 - Grand Isle, LA | 20 mi | 61 min | ESE 5.1G | 73°F | 75°F | 30.08 | ||
BYGL1 - 8762482 - Bayou Gauche, LA | 26 mi | 61 min | 74°F | 75°F | 30.08 | |||
CARL1 | 27 mi | 61 min | 66°F | |||||
PTFL1 | 30 mi | 61 min | 73°F | 30.07 | ||||
SHBL1 - 8761305 - Shell Beach, LA | 31 mi | 61 min | ESE 7G | 73°F | 67°F | 30.09 | ||
NWCL1 - 8761927 - New Canal, LA | 34 mi | 61 min | SE 2.9G | 72°F | 30.09 | |||
LOPL1 - Louisiana Offshore Oil Port, LA | 45 mi | 46 min | SSE 8 | 74°F | 5 ft | 30.07 | 73°F | |
PILL1 | 49 mi | 61 min | SSE 5.1G | 72°F | 65°F | 30.09 |
Wind History for Grand Isle, LA
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Airport Reports
Link to 1 hour of 5 minute data for KGAO
Terminal Aerodrome Forecast (TAF) for KGAO
Wind History Graph: GAO
(wind in knots)GEOS Local Image of Southeast
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New Orleans/Baton Rouge, LA,

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