Thursday, April2, 2020
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Marine Weather and Tides
Grand Isle, LA

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:46AMSunset 7:21PM Thursday April 2, 2020 4:39 AM CDT (09:39 UTC) Moonrise 12:32PMMoonset 1:55AM Illumination 69% Phase: Waxing Gibbous; Moon at 9 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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GMZ552 Expires:202004022030;;443377 Fzus54 Klix 020758 Cwflix Coastal Waters Forecast National Weather Service New Orleans La 258 Am Cdt Thu Apr 2 2020 Pascagoula To Atchafalaya River Out To 60 Mile 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 Ten Percent Of The Waves. Gmz550-552-022030- Coastal Waters From Port Fourchon La To Lower Atchafalaya River La Out 20 Nm- Coastal Waters From The Southwest Pass Of The Mississippi River To Port Fourchon Louisiana Out 20 Mile- 258 Am Cdt Thu Apr 2 2020
Today..East winds 10 to 15 knots. Seas 2 to 4 feet. Dominant period 4 seconds.
Tonight..Southeast winds 10 to 15 knots. Seas 2 to 4 feet. Dominant period 4 seconds.
Friday..Southeast winds 10 to 15 knots. Seas 2 to 4 feet. Dominant period 4 seconds.
Friday night..East winds 10 to 15 knots. Seas 2 to 4 feet. Dominant period 4 seconds.
Saturday..Southeast winds 10 to 15 knots. Seas 2 to 4 feet. Dominant period 4 seconds. Chance of showers.
Saturday night..East winds 10 to 15 knots. Seas 2 to 4 feet. Dominant period 5 seconds. Chance of showers.
Sunday..East winds 10 to 15 knots. Seas 2 to 4 feet. Dominant period 6 seconds. Chance of showers through the day.
Sunday night..Southeast winds 10 to 15 knots. Seas 2 to 4 feet. Dominant period 6 seconds.
Monday..Southeast winds 5 to 10 knots. Seas 2 to 4 feet. Dominant period 6 seconds.
Monday night..South winds 10 to 15 knots. Seas 2 to 4 feet. Dominant period 6 seconds.
GMZ500 Synopsis Pascagoula To Sw Pass Mississippi- Synopsis Sw Pass Mississippi River To Atchafalaya River- 258 Am Cdt Thu Apr 2 2020
Synopsis..High pressure will remain centered to the north and northeast of the water through the next 5 to 7 days. Weak frontal boundary will try to nudge in Saturday night but will quickly lift north Sunday.


7 Day Forecast for Marine Location Near Grand Isle, LA
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location: 29.2, -90.05     debug


Area Discussion for - New Orleans/Baton Rouge, LA
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FXUS64 KLIX 020755 AFDLIX

Area Forecast Discussion National Weather Service New Orleans LA 255 AM CDT Thu Apr 2 2020

SHORT TERM. It has been a quiet and generally cool night. by 07z most of the area had already fallen into the 50s. The few locations that hadn't yet were in the lower 60s while a few other locations were in the lower 50s on their way to the upper 40s.

Nothing much really to talk about today. We will see LL temps begin to slowly moderate with h925 temps around 14/15C which should easily yield highs in the mid 70s with a few upper 70s around the region. Forecast issue comes this evening and tonight as a noticeable jet streak moves across the region. At 8z this feature is seen on WV moving over the Sierra Madre into the Big Bend region of TX. Even with this feature moving overhead tonight it just doesn't appear we will moisten up enough to get much to develop. PWs from last nights sndg were only 0.65" and this was lower than what the GFS initialized with. Will keep the forecast dry for tonight. This agrees with all of the latest guidance as well.

As for rain potential Friday and Friday night this doesn't really look that good either. Our jet streak will move east-southeast of the region while we move under the base of a highly amplified yet squeezed ridge. The airmass will continue to struggle to recover which may not finally occur till Friday night. Combine that with no real lift (maybe even subsidence aloft) and possibly the only positive for rain would be daytime heating and possibly weak seabreeze support. With that will keep the forecast dry for Friday and Friday night however, we may actually see rain trying to nudge in from the west early Saturday morning.

Saturday rain chances look a little better but not great. The ridge over the CONUS will begin to slide to the east and this may allow a little better mid level support to move in. The slight lowering of hghts in combination with deeper moisture along with whatever convection to our west is out there should allow for a few shra to push into the area. Rain chance still don't look great heading into the night and Sunday as ridging over the western Gulf could build across the area driving what ever disturbances coming from the Pac to our north thus keeping us dry. /CAB/

LONG TERM. /Sunday through Wednesday/ Fringe affects of a Canadian airmass will be in place over the Gulf States Sunday with easterly flow veering to onshore return flow Monday. Slow evolving central Plains cyclogenesis bottles much of the baroclinicity well north of the forecast area but a weak trough may settle into the area to bring a chance of showers and thunderstorms Wednesday and Thursday ahead of a stronger frontal boundary, along with influences from what should be a better gulf breeze regime by middle of next week. Temperatures should be quite warm during the extended portion with Tuesday and Wednesday possibly challenging 90F in a few locations. Morning lows will start near normal levels but warm with increasing humidity middle of the week. 24/RR

AVIATION. Pretty quiet on the aviation front. For the next 24 to 30 hours all sites should remain in VFR status. /CAB/

MARINE. High pressure remaining centered off to the north and northeast will lad to winds becoming onshore later today and likely remaining either out of the southeast or south through much of the forecast. Winds should remain below 13 kts for much of the forecast with seas generally in the 2-3ft range. Will show seas to 4 feet at times due to persistent southerly or southeasterly winds possibly leading to a weak swell. /CAB/

DECISION SUPPORT.

DSS code: Blue. Deployed: None. Activation: None. Activities: Forecast support for COVID-19 outdoor test sites. River Flood Warnings

PRELIMINARY POINT TEMPS/POPS. MCB 75 59 78 60 / 0 10 0 10 BTR 78 59 81 62 / 0 10 10 10 ASD 78 57 79 61 / 0 0 10 10 MSY 79 63 80 66 / 0 10 10 10 GPT 74 61 76 62 / 0 0 0 10 PQL 78 55 79 59 / 0 10 0 0

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
GISL1 - 8761724 - Grand Isle, LA 7 mi51 min NE 4.1 G 5.1 73°F
KXPY 10 mi24 min N 2.9 63°F 52°F
42093 17 mi39 min 68°F1 ft
LOPL1 - Louisiana Offshore Oil Port, LA 22 mi77 min NNE 1.9 G 4.1 65°F 1 ft1016.1 hPa49°F
KDLP 27 mi24 min N 5.1 66°F 52°F
SPLL1 - South Timbalier Block 52, LA / CSI06 32 mi99 min E 2.9 G 5.1 68°F
BURL1 - Southwest Pass, LA 39 mi39 min Calm G 0
PSTL1 - 8760922 - Pilot's East, SW Pass, LA 39 mi51 min Calm G 1.9
KMDJ 41 mi24 min ENE 5.1 66°F 50°F
PILL1 42 mi51 min Calm G 1.9 58°F 60°F1016 hPa
BYGL1 - 8762482 - Bayou Gauche, LA 45 mi57 min WNW 1.9 G 2.9 59°F 74°F1015.9 hPa

Wind History for Grand Isle, LA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Port Fourchon, LA10 mi44 minN 010.00 miFair63°F50°F64%1015.9 hPa
Galliano, South Lafourche Airport, LA20 mi44 minN 010.00 miFair49°F47°F94%1015.9 hPa

Link to 5 minute data for KXPY

Wind History from XPY (wind in knots)
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E6SE5SE4S4S4S4CalmCalmCalmCalmN3
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Tide / Current Tables for Caminada Pass (bridge), Mississippi River Delta, Louisiana
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Caminada Pass (bridge)
Click for Map
Thu -- 02:55 AM CDT     Moonset
Thu -- 05:36 AM CDT     -0.23 feet Low Tide
Thu -- 06:48 AM CDT     Sunrise
Thu -- 01:32 PM CDT     Moonrise
Thu -- 06:54 PM CDT     0.91 feet High Tide
Thu -- 07:19 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.20-0.1-0.2-0.2-0.2-0.2-0.1-00.10.20.30.50.60.70.80.80.90.90.90.80.70.6

Tide / Current Tables for Bayou Rigaud, Grand Isle, Mississippi River Delta, Louisiana
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Bayou Rigaud
Click for Map
Thu -- 02:55 AM CDT     Moonset
Thu -- 04:21 AM CDT     -0.09 feet Low Tide
Thu -- 06:47 AM CDT     Sunrise
Thu -- 01:31 PM CDT     Moonrise
Thu -- 05:51 PM CDT     1.27 feet High Tide
Thu -- 07:19 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.20-0-0.1-0.1-00.10.20.30.40.60.70.911.11.21.31.31.21.21.10.90.7

Weather Map
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wmap_A
GEOS Local Image of Southeast    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for New Orleans/Baton Rouge, LA (5,6,7,8)
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Ground Weather Radar Station New Orleans/Baton Rouge, LA
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Gulf Stream Current


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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.