Tuesday, July14, 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 6:08AMSunset 8:04PM Tuesday July 14, 2020 1:48 AM CDT (06:48 UTC) Moonrise 12:30AMMoonset 1:42PM Illumination 36% Phase: Waning Crescent; Moon at 24 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:202007141615;;813467 Fzus54 Klix 140319 Cwflix Coastal Waters Forecast National Weather Service New Orleans La 1019 Pm Cdt Mon Jul 13 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. Gmz550-552-141615- 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- 1019 Pm Cdt Mon Jul 13 2020
Rest of tonight..West winds 10 to 15 knots. Seas 2 to 4 feet. Dominant period 6 seconds.
Tuesday..Southwest winds 5 to 10 knots. Seas 1 to 2 feet. Dominant period 5 seconds. Slight chance of showers and Thunderstorms through the day.
Tuesday night..Southwest winds 5 to 10 knots. Seas 1 to 2 feet. Dominant period 5 seconds.
Wednesday..Southwest winds 5 to 10 knots. Seas 1 to 2 feet. Dominant period 4 seconds. Slight chance of showers and Thunderstorms.
Wednesday night..Southwest winds 5 to 10 knots. Seas 1 foot or less. Dominant period 5 seconds.
Thursday..Southwest winds near 5 knots. Seas 1 foot or less. Dominant period 5 seconds. Slight chance of showers and Thunderstorms through the day.
Thursday night..South winds near 5 knots becoming northwest after midnight. Seas 1 foot or less. Dominant period 5 seconds.
Friday..Northeast winds 5 to 10 knots becoming east in the afternoon. Seas 1 foot or less. Dominant period 5 seconds. Slight chance of showers and Thunderstorms.
Friday night..East winds 5 to 10 knots. Seas 1 foot or less. Dominant period 5 seconds.
Saturday..East winds 10 to 15 knots. Seas 1 foot or less. Dominant period 5 seconds. Slight chance of showers and Thunderstorms through the day.
Saturday night..East winds 10 to 15 knots. Seas 1 to 2 feet. Slight chance of showers and Thunderstorms after midnight.
GMZ500 Synopsis Pascagoula To Sw Pass Mississippi- Synopsis Sw Pass Mississippi River To Atchafalaya River- 1019 Pm Cdt Mon Jul 13 2020
Synopsis..High pressure will remain settled over the central gulf waters through the week.


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 140508 AFDLIX

Area Forecast Discussion National Weather Service New Orleans LA 1208 AM CDT Tue Jul 14 2020

UPDATE. updated for 06z taf issuance.

PREV DISCUSSION. /issued 431 PM CDT Mon Jul 13 2020/

SHORT TERM.

Coverage of isolated to scattered showers and thunderstorms finally developed as expected this afternoon which is breaking the heat in some areas. The Excessive Heat Warning and Heat Advisory were still validated however with heat index readings rising to 108 to 115 in most locations. A few storms the remainder of this afternoon and early this evening could still pulse up to strong to marginally severe levels with wind gusts over 40 mph possible along with a few locations with torrential downpours and minor flooding.

The pattern will be evolving from a dominant mid/upper high across the southwest/south central states to an elongated high across the entire southern U.S. tier with a general weakness/small scale, stalled shortwave trough over the central Gulf coast region by mid week. Tomorrow will still be warmer than normal with high enough humidity levels to produce heat index readings of 108 or higher, so a Heat Advisory has been issued valid from 10 am to 8 pm. Like today, the lucky areas that see the isolated to scattered showers and thunderstorms will have a shorter duration of high heat indices, however those that don't get rain will keep the miserable conditions around longer.

Not much change is noted Wednesday into Thursday, however the 12z model runs today really increased the PoPs today, while the NBM and official NWS forecast are a bit more conservative raising the rain chances and lower temperatures (keeping it hotter).

LONG TERM.

Friday through next Monday has a greater uncertainty today, as some models indicate a continental mid/upper high to our north dominating and keeping the area relatively dry, while some other models indicate a tropical connection developing form the easterlies and at least weak wave/inverted trough features moving east to west across the Gulf of Mexico. Have a fairly seasonal forecast Friday through the weekend with scattered mainly afternoon showers and thunderstorms before going back up to 50 to 60% rain chances on Monday. Temperatures should be closer to seasonal normals.

AVIATION. VFR conditions are expected at terminals outside of any thunderstorms that directly impacts one, with the best timing being late morning and early afternoon. For any storms that form could have gusty winds and reduced visibilities. -BL

MARINE.

A few showers and thunderstorms, some with strong gusty winds, are expected to impact the tidal lakes, sounds and at least nearshore coastal waters at times for the next week. Otherwise, relatively light to at times moderate winds and low seas expected outside of convection.

PRELIMINARY POINT TEMPS/POPS. MCB 95 77 93 75 / 30 0 50 0 BTR 95 78 93 76 / 30 0 40 0 ASD 95 77 94 75 / 40 0 50 10 MSY 95 80 94 78 / 40 0 40 10 GPT 93 79 91 76 / 30 10 50 10 PQL 95 76 94 74 / 40 10 50 10

LIX WATCHES/WARNINGS/ADVISORIES. LA . Heat Advisory from 10 AM this morning to 8 PM CDT this evening for LAZ034>037-039-040-046>050-056>072.

GM . None. MS . Heat Advisory from 10 AM this morning to 8 PM CDT this evening for MSZ068>071-077-080>082.

GM . None.


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
GISL1 - 8761724 - Grand Isle, LA 7 mi61 min 84°F
KXPY 10 mi49 min WSW 5.1 82°F 79°F
42093 17 mi53 min 85°F1 ft
LOPL1 - Louisiana Offshore Oil Port, LA 22 mi47 min WNW 6 G 11 84°F 1 ft1014.1 hPa75°F
KDLP 27 mi54 min W 12 G 18 84°F 77°F
BURL1 - Southwest Pass, LA 39 mi49 min 13 G 14
PSTL1 - 8760922 - Pilot's East, SW Pass, LA 39 mi181 min 1012.7 hPa
PILL1 42 mi61 min 85°F
BYGL1 - 8762482 - Bayou Gauche, LA 45 mi61 min 87°F

Wind History for Grand Isle, LA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Port Fourchon, LA10 mi49 minWSW 510.00 miFair82°F78°F89%1013.9 hPa

Link to 5 minute data for KXPY

Wind History from XPY (wind in knots)
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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
Tue -- 01:30 AM CDT     Moonrise
Tue -- 06:10 AM CDT     Sunrise
Tue -- 08:14 AM CDT     0.78 feet High Tide
Tue -- 02:41 PM CDT     Moonset
Tue -- 07:07 PM CDT     0.22 feet Low Tide
Tue -- 08:01 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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Tide / Current Tables for Bayou Rigaud, Grand Isle, Mississippi River Delta, Louisiana
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Bayou Rigaud
Click for Map
Tue -- 01:29 AM CDT     Moonrise
Tue -- 06:10 AM CDT     Sunrise
Tue -- 07:05 AM CDT     0.85 feet High Tide
Tue -- 02:41 PM CDT     Moonset
Tue -- 05:44 PM CDT     0.18 feet Low Tide
Tue -- 08:00 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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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 (2,6,7,8)
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Ground Weather Radar Station New Orleans/Baton Rouge, LA
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Gulf Stream Current


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Disclaimer:
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.