Marine Weather and Tide Forecast for Grand Isle, LA
December 8, 2024 3:47 AM CST (09:47 UTC) Change Location
 | Sunrise 6:42 AM Sunset 5:02 PM Moonrise 12:22 PM Moonset 12:00 AM |
GMZ552 Coastal Waters From The Southwest Pass Of The Mississippi River To Port Fourchon Louisiana Out 20 Nm- Coastal Waters From Boothville La To Southwest Pass Of The Mississippi River Out 20 Nm- 308 Am Cst Sun Dec 8 2024
.small craft exercise caution in effect from this evening through Monday morning - .
Today - Southeast winds 10 to 15 knots. Seas around 2 feet. Wave detail: southeast 2 feet at 5 seconds.
Tonight - South winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet after midnight. Wave detail: southeast 3 feet at 5 seconds, becoming south 4 feet at 6 seconds.
Monday - Southwest winds 10 to 15 knots with gusts up to 20 knots, diminishing to 5 to 10 knots in the afternoon. Seas 3 to 5 feet, occasionally to 6 feet. Wave detail: south 4 feet at 6 seconds. A chance of showers in the morning, then showers likely in the afternoon.
Monday night - South winds 5 to 10 knots, increasing to 10 to 15 knots after midnight. Seas 2 to 4 feet, occasionally to 5 feet. Wave detail: south 3 feet at 6 seconds. Showers likely. A slight chance of Thunderstorms in the evening, then a chance of Thunderstorms after midnight.
Tuesday - Southwest winds 10 to 15 knots with gusts up to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave detail: south 3 feet at 6 seconds. A slight chance of Thunderstorms. Showers.
Tuesday night - Northwest winds 20 to 25 knots, becoming north 25 to 30 knots after midnight. Seas 3 to 5 feet, occasionally to 6 feet. Wave detail: northwest 5 feet at 5 seconds and southeast 3 feet at 6 seconds. A slight chance of Thunderstorms. Showers likely, mainly in the evening.
Wednesday - North winds 25 to 30 knots, diminishing to 20 to 25 knots in the afternoon. Seas 4 to 6 feet, occasionally to 8 feet. Wave detail: northwest 6 feet at 5 seconds and east 3 feet at 6 seconds.
Wednesday night - North winds 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave detail: north 3 feet at 4 seconds.
Thursday - Northeast winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave detail: northeast 3 feet at 5 seconds.
Thursday night - East winds 10 to 15 knots. Seas 2 to 3 feet. Wave detail: east 3 feet at 5 seconds.
winds and seas higher in and near Thunderstorms.
winds and seas higher in and near Thunderstorms.
GMZ500 308 Am Cst Sun Dec 8 2024
Synopsis for pascagoula to atchafalaya river out 60 nm -
onshore flow will remain until the next cold front moves through Tuesday night into Wednesday allowing strong high pressure to settle into the northern gulf with strong northwest winds that will ease by the end of the week and shift easterly.
onshore flow will remain until the next cold front moves through Tuesday night into Wednesday allowing strong high pressure to settle into the northern gulf with strong northwest winds that will ease by the end of the week and shift easterly.
NEW! Add second zone forecast
| Caminada Pass (bridge) Click for Map Sun -- 02:46 AM CST 0.68 feet High Tide Sun -- 06:42 AM CST Sunrise Sun -- 09:27 AM CST First Quarter Sun -- 12:22 PM CST Moonrise Sun -- 01:56 PM CST 0.04 feet Low Tide Sun -- 05:02 PM CST Sunset Tide / Current data from XTide NOT FOR NAVIGATION |
Caminada Pass (bridge), Mississippi River Delta, Louisiana, Tide feet
| 12 am |
| 0.6 |
| 1 am |
| 0.6 |
| 2 am |
| 0.7 |
| 3 am |
| 0.7 |
| 4 am |
| 0.7 |
| 5 am |
| 0.6 |
| 6 am |
| 0.6 |
| 7 am |
| 0.5 |
| 8 am |
| 0.4 |
| 9 am |
| 0.3 |
| 10 am |
| 0.2 |
| 11 am |
| 0.1 |
| 12 pm |
| 0.1 |
| 1 pm |
| 0 |
| 2 pm |
| 0 |
| 3 pm |
| 0.1 |
| 4 pm |
| 0.1 |
| 5 pm |
| 0.1 |
| 6 pm |
| 0.2 |
| 7 pm |
| 0.3 |
| 8 pm |
| 0.3 |
| 9 pm |
| 0.4 |
| 10 pm |
| 0.4 |
| 11 pm |
| 0.4 |
| Bayou Rigaud Click for Map Sun -- 01:36 AM CST 0.74 feet High Tide Sun -- 06:42 AM CST Sunrise Sun -- 09:27 AM CST First Quarter Sun -- 12:21 PM CST Moonrise Sun -- 12:27 PM CST 0.05 feet Low Tide Sun -- 05:01 PM CST Sunset Sun -- 10:46 PM CST 0.50 feet High Tide Tide / Current data from XTide NOT FOR NAVIGATION |
Bayou Rigaud, Grand Isle, Mississippi River Delta, Louisiana, Tide feet
| 12 am |
| 0.7 |
| 1 am |
| 0.7 |
| 2 am |
| 0.7 |
| 3 am |
| 0.7 |
| 4 am |
| 0.7 |
| 5 am |
| 0.6 |
| 6 am |
| 0.5 |
| 7 am |
| 0.4 |
| 8 am |
| 0.3 |
| 9 am |
| 0.2 |
| 10 am |
| 0.1 |
| 11 am |
| 0.1 |
| 12 pm |
| 0 |
| 1 pm |
| 0.1 |
| 2 pm |
| 0.1 |
| 3 pm |
| 0.1 |
| 4 pm |
| 0.2 |
| 5 pm |
| 0.3 |
| 6 pm |
| 0.3 |
| 7 pm |
| 0.4 |
| 8 pm |
| 0.5 |
| 9 pm |
| 0.5 |
| 10 pm |
| 0.5 |
| 11 pm |
| 0.5 |
Area Discussion for New Orleans/Baton Rouge, LA
Hide HelpNOTE: mouseover dotted underlined text for definition
FXUS64 KLIX 080908 AFDLIX
Area Forecast Discussion National Weather Service New Orleans LA 308 AM CST Sun Dec 8 2024
New SHORT TERM, LONG TERM, AVIATION, MARINE
SHORT TERM
(Today through Monday)
Issued at 248 AM CST Sun Dec 8 2024
There is no evidence that any of the activity associated with this scenario will be sfc based. Even getting lightning will be tough but possible well inland and where it shows up will be with the heaviest rainfall. The most lightning activity that occurs should be closer to the coast. That just leaves elevated deep convective bursts via dynamic contributions. There is a weak boundary that is best seen in the thetaE lapse rate field between 850-600mb. The 850mb high and the sfc high will be to the east helping to bring moisture from deep in the gulf up to this boundary, but the main lift will come from the H3 jet. All this moisture will move up and over the lower thetaE air at the sfc providing more of an isentropic lifting situation with more of a tilt to the isentropic layers brought about by the layer lifting from the jet. The first of these jet pulses(disturbances) is currently starting to take shape this morning and is starting to show some radar echoes over the gulf from near Freeport TX due south. The rest of the light rain that is showing up over southern TX is gentle lift over subtle isentropic surfaces with help from the synoptic H3 jet. The sfc low and attendant weak boundary is located just west of this line of developing sh/ts and is responsible for connecting the sfc variables to the upper jet flow. This moisture will simply spread northward becoming elevated over land areas today and eventually spread over our NW zones by afternoon. There will be some light showers around before the moderate to heavy stuff gets to these zones today, but the heaviest rainfall for the NW areas should be between 3p and 10p today. This linear feature will not just dissipate but won't be as intense once this pulse moves NE this evening and will continue slowly sinking southeast. The second pulse, which looks to be the strongest, comes in Monday just before noon. Again, there will be light showers around before and after this pulse too, but the heaviest rain with this one should start just before noon Monday through about 7p. And since, the jet will have sunk a bit farther southeast, this pulse will impact areas mainly over the SE portion of the CWA
LONG TERM
(Monday night through Saturday)
Issued at 248 AM CST Sun Dec 8 2024
A third and final pulse should begin moving through early Tuesday.
This one looks to be weaker and should enhance the light rain around the area into moderate rainfall. The timing with this is a bit more guess work but looks to be from 3a to around noon Tue. The cold front begins to enter the picture while this pulse is moving out and will be able to keep some of the linear light to moderate rainfall going until it moves all this out over the gulf by late Tue afternoon. Totals of 1 to 3 inches should be common with isolated higher amounts possible. Once the front moves through, strong winds will carry CAA and DAA along with it bringing highs back into the 50s by Wed and Thu and freezing temps for northshore areas for Wed night. A warming trend should take hold by the end of this week.
AVIATION
(12Z TAFS)
Issued at 248 AM CST Sun Dec 8 2024
VFR should be the rule through this morning but cigs will begin to slowly lower through the day and we should have all sites in MVFR levels shortly after noon today. These conditions will remain as some -SHRA moves through as well. Cigs will slowly lower through the night hours bringing most if not all sites to IFR levels by midnight or shortly after. The heaviest rainfall will be timed in the this taf pack but there will be -SHRA moving through from time to time later today through tonight.
MARINE
Issued at 248 AM CST Sun Dec 8 2024
South winds will begin to rise to around 20kt ahead of the next system tonight into early Monday. Headlines will be raised for these conditions, but should be short lived until after the front passes through the northern gulf late Tue night or Wed with strong NW winds around 20-30kt. This should last into Thu before easing.
PRELIMINARY POINT TEMPS/POPS
MCB 65 60 70 61 / 80 90 90 80 BTR 71 65 75 65 / 80 90 90 80 ASD 70 62 71 62 / 30 60 90 80 MSY 72 65 71 64 / 30 60 90 80 GPT 68 61 70 61 / 20 60 80 80 PQL 71 60 74 62 / 20 50 80 80
LIX WATCHES/WARNINGS/ADVISORIES
LA...None.
GM...Small Craft Advisory from 9 PM this evening to 9 AM CST Monday for GMZ570-572.
MS...None.
GM...Small Craft Advisory from 9 PM this evening to 9 AM CST Monday for GMZ572.
Area Forecast Discussion National Weather Service New Orleans LA 308 AM CST Sun Dec 8 2024
New SHORT TERM, LONG TERM, AVIATION, MARINE
SHORT TERM
(Today through Monday)
Issued at 248 AM CST Sun Dec 8 2024
There is no evidence that any of the activity associated with this scenario will be sfc based. Even getting lightning will be tough but possible well inland and where it shows up will be with the heaviest rainfall. The most lightning activity that occurs should be closer to the coast. That just leaves elevated deep convective bursts via dynamic contributions. There is a weak boundary that is best seen in the thetaE lapse rate field between 850-600mb. The 850mb high and the sfc high will be to the east helping to bring moisture from deep in the gulf up to this boundary, but the main lift will come from the H3 jet. All this moisture will move up and over the lower thetaE air at the sfc providing more of an isentropic lifting situation with more of a tilt to the isentropic layers brought about by the layer lifting from the jet. The first of these jet pulses(disturbances) is currently starting to take shape this morning and is starting to show some radar echoes over the gulf from near Freeport TX due south. The rest of the light rain that is showing up over southern TX is gentle lift over subtle isentropic surfaces with help from the synoptic H3 jet. The sfc low and attendant weak boundary is located just west of this line of developing sh/ts and is responsible for connecting the sfc variables to the upper jet flow. This moisture will simply spread northward becoming elevated over land areas today and eventually spread over our NW zones by afternoon. There will be some light showers around before the moderate to heavy stuff gets to these zones today, but the heaviest rainfall for the NW areas should be between 3p and 10p today. This linear feature will not just dissipate but won't be as intense once this pulse moves NE this evening and will continue slowly sinking southeast. The second pulse, which looks to be the strongest, comes in Monday just before noon. Again, there will be light showers around before and after this pulse too, but the heaviest rain with this one should start just before noon Monday through about 7p. And since, the jet will have sunk a bit farther southeast, this pulse will impact areas mainly over the SE portion of the CWA
LONG TERM
(Monday night through Saturday)
Issued at 248 AM CST Sun Dec 8 2024
A third and final pulse should begin moving through early Tuesday.
This one looks to be weaker and should enhance the light rain around the area into moderate rainfall. The timing with this is a bit more guess work but looks to be from 3a to around noon Tue. The cold front begins to enter the picture while this pulse is moving out and will be able to keep some of the linear light to moderate rainfall going until it moves all this out over the gulf by late Tue afternoon. Totals of 1 to 3 inches should be common with isolated higher amounts possible. Once the front moves through, strong winds will carry CAA and DAA along with it bringing highs back into the 50s by Wed and Thu and freezing temps for northshore areas for Wed night. A warming trend should take hold by the end of this week.
AVIATION
(12Z TAFS)
Issued at 248 AM CST Sun Dec 8 2024
VFR should be the rule through this morning but cigs will begin to slowly lower through the day and we should have all sites in MVFR levels shortly after noon today. These conditions will remain as some -SHRA moves through as well. Cigs will slowly lower through the night hours bringing most if not all sites to IFR levels by midnight or shortly after. The heaviest rainfall will be timed in the this taf pack but there will be -SHRA moving through from time to time later today through tonight.
MARINE
Issued at 248 AM CST Sun Dec 8 2024
South winds will begin to rise to around 20kt ahead of the next system tonight into early Monday. Headlines will be raised for these conditions, but should be short lived until after the front passes through the northern gulf late Tue night or Wed with strong NW winds around 20-30kt. This should last into Thu before easing.
PRELIMINARY POINT TEMPS/POPS
MCB 65 60 70 61 / 80 90 90 80 BTR 71 65 75 65 / 80 90 90 80 ASD 70 62 71 62 / 30 60 90 80 MSY 72 65 71 64 / 30 60 90 80 GPT 68 61 70 61 / 20 60 80 80 PQL 71 60 74 62 / 20 50 80 80
LIX WATCHES/WARNINGS/ADVISORIES
LA...None.
GM...Small Craft Advisory from 9 PM this evening to 9 AM CST Monday for GMZ570-572.
MS...None.
GM...Small Craft Advisory from 9 PM this evening to 9 AM CST Monday for GMZ572.
| Stations | Dist | Age | Wind | Air | Water | Waves | inHg | DewPt |
| GISL1 - 8761724 - Grand Isle, LA | 7 mi | 60 min | E 8G | 30.20 | ||||
| PTFL1 | 10 mi | 60 min | 30.18 | |||||
| LOPL1 - Louisiana Offshore Oil Port, LA | 22 mi | 52 min | SSE 12G | 70°F | 2 ft | 30.19 | 60°F | |
| 42084 | 26 mi | 48 min | 69°F | 69°F | 2 ft | |||
| BURL1 - Southwest Pass, LA | 39 mi | 48 min | ESE 9.9G | 69°F | 30.21 | 60°F | ||
| PSTL1 - 8760922 - Pilot's East, SW Pass, LA | 39 mi | 60 min | SE 5.1G | 30.20 | ||||
| PILL1 | 42 mi | 60 min | ENE 4.1G | 30.21 | ||||
| BYGL1 - 8762482 - Bayou Gauche, LA | 45 mi | 60 min | 30.20 |
Wind History for Grand Isle, LA
toggle option: (graph/table)
Link to 1 hour of 5 minute data for KXPY
Terminal Aerodrome Forecast (TAF) for KXPY
Wind History Graph: XPY
(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