Wednesday, April14, 2021
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Marine Weather and Tides
Grand Isle, LA

Version 3.4
NOTICE
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:32AMSunset 7:28PM Wednesday April 14, 2021 5:36 AM CDT (10:36 UTC) Moonrise 7:09AMMoonset 8:54PM Illumination 6% Phase: Waxing Crescent; Moon at 2 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:202104142230;;531547 Fzus54 Klix 140922 Cwflix Coastal Waters Forecast National Weather Service New Orleans La 422 Am Cdt Wed Apr 14 2021 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. Gmz550-552-142230- 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- 422 Am Cdt Wed Apr 14 2021
.small craft advisory in effect through this evening...
Today..Southeast winds 20 to 25 knots. Seas 3 to 5 feet with occasional seas to 6 feet. Dominant period 6 seconds. Chance of showers and Thunderstorms.
Tonight..South winds 10 to 15 knots. Seas 3 to 5 feet. Dominant period 6 seconds. Slight chance of light rain late in the evening. Chance of showers and Thunderstorms after midnight.
Thursday..West winds 10 to 15 knots becoming northeast late in the afternoon. Seas 3 to 5 feet. Dominant period 6 seconds. Showers and Thunderstorms likely in the morning, then chance of showers and Thunderstorms in the afternoon.
Thursday night..East winds 10 to 15 knots. Seas 2 to 4 feet. Dominant period 6 seconds.
Friday..Southeast winds 10 to 15 knots. Seas 2 to 4 feet. Dominant period 6 seconds. Chance of showers and Thunderstorms.
Friday night..South winds 10 to 15 knots becoming southwest after midnight. Seas 2 to 4 feet. Dominant period 5 seconds. Chance of showers and slight chance of Thunderstorms through the night.
Saturday..West winds 10 to 15 knots becoming north 15 to 20 knots in the late morning and afternoon. Seas 3 to 5 feet. Dominant period 5 seconds. Showers likely in the morning. Chance of Thunderstorms through the day. Chance of showers in the afternoon.
Saturday night..Northeast winds 20 to 25 knots. Seas 3 to 6 feet. Dominant period 4 seconds. Showers likely and slight chance of Thunderstorms.
Sunday..Northeast winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas to 6 feet. Dominant period 4 seconds. Chance of showers and slight chance of Thunderstorms.
Sunday night..North winds 15 to 20 knots. Seas 3 to 5 feet. Dominant period 4 seconds. Slight chance of showers.
GMZ500 Synopsis Pascagoula To Sw Pass Mississippi- Synopsis Sw Pass Mississippi River To Atchafalaya River- 422 Am Cdt Wed Apr 14 2021
Synopsis..A stalled frontal boundary near the coast will remain in place through the end of the work week. Another large complex of Thunderstorms is expected to impact the marine areas today with strong winds near and in the wake of the Thunderstorms. A cold front is expected to move through the northern gulf by the weekend.


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 140922 AFDLIX

Area Forecast Discussion National Weather Service New Orleans LA 422 AM CDT Wed Apr 14 2021

SHORT TERM (Today through Friday Night). Everything being looked at this morning shows a similar show to yesterday with the exception of severe wx numbers not being as high but still high enough to produce some strong to severe thunderstorms with the main issues being wind and hail and lots of water falling. With the current fcast, additional rainfall totals through Friday night would be from 3 to 5 inches with isoalted higher amounts. Since soils are quite saturated, this just becomes runoff and flooding is likely in areas that see high rainfall rates even if those areas are not normally threatened by flood waters. The flood watch will remain for now through noon Thursday but this may be temporaly extended through Friday night. This is the first model run for all global models to agree on keeping the frontal boundary locked onshore through Friday. The EURO has been showing this could be the case for few days but the others were bringing it out over the gulf. If they keep this solution as a trend, then the flood watch would likely be extended through Friday night.

Again, this pulse that will affect the area today will initiate to our west and move through and could be a little earlier than yesterday. This should be a recurring theme until a strong cold front moves in Saturday morning to clean the area of this frontal boundary that is stalled over the area. But don't look for sunny and mild, instead overrunning should keep the area cool and rainy, but not heavy rain, until Monday or Tuesday.

LONG TERM (Saturday through Wednesday).

Precipitable water values remain relatively high as mentioned in the previous package for the Friday-Saturday time period in association to another round of expected heavy rainfall. GFS guidance has highest rainfall potential on Friday, but as far as location goes it looks to be closer to the coast and off shore. As of now severe weather is not expected, but certainty is low and forecast is subject to change as we near the weekend. Things still trending pretty in line with previous forecast, so no major changes were made. Beyond that, high pressure building in from the west by the start of next week should help us begin to dry out and get some clear weather through at least mid week. /TDB/

AVIATION. Conditions to MVFR are expected to develop from northwest to southeast during the morning to midday with IFR expected late this afternoon and especially tonight. Another line of TSRA with strong winds may develop similar to yesterday with a slightly earlier onset.

MARINE. A front trough remains locked north of the coast while sh/ts are develop each time a disturbance rides along it. This will occur again today. The section of waters impacted the strongest should be east of the river today but there will be thunderstorms that move out over most of the water west of the river as well. Although winds stayed in gale criteria for several hours yesterday from a wake low, this area is not advertised to keep winds in gales today but instead just bringing gales for a short duration as the line of thunderstorms moves out over the water. If a wake low does form with this, then headlines would be needed for these areas. In general, winds will be S to SE around 15kt but when these thunderstorm complexes move out over the gulf, winds will shift rapidly from mostly what direction the storms are approaching. This scenario should play out day after day until a stronger cold front moves through by the weekend to clean all the messy weather that came before it. Winds on the back side of this front should be around 20- 25kt from the N.

PRELIMINARY POINT TEMPS/POPS. MCB 73 59 73 54 / 100 80 60 40 BTR 76 62 74 58 / 100 80 70 40 ASD 76 64 76 57 / 100 80 90 30 MSY 79 67 76 64 / 100 90 100 30 GPT 75 64 75 57 / 100 80 80 30 PQL 76 63 74 56 / 90 80 90 20

LIX WATCHES/WARNINGS/ADVISORIES. LA . Flash Flood Watch through Thursday morning for LAZ034>037-039- 046>050-056>061-063>072-075>078.

GM . Small Craft Advisory until 7 PM CDT this evening for GMZ550-552- 555-570-572-575.

Flash Flood Watch through Thursday morning for GMZ530.

MS . Flash Flood Watch through Thursday morning for MSZ068>071-077- 080>082.

GM . Small Craft Advisory until 7 PM CDT this evening for GMZ552-555- 570-572-575.




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
GISL1 - 8761724 - Grand Isle, LA 7 mi67 min 5.1 G 8 71°F
LOPL1 - Louisiana Offshore Oil Port, LA 22 mi57 min 23 G 31 77°F 1013.1 hPa58°F
BURL1 - Southwest Pass, LA 39 mi37 min 11 G 11
PSTL1 - 8760922 - Pilot's East, SW Pass, LA 39 mi67 min S 11 G 14 74°F 63°F1012.1 hPa
PILL1 42 mi67 min S 1.9 G 2.9 69°F 64°F1014.3 hPa
BYGL1 - 8762482 - Bayou Gauche, LA 45 mi67 min NE 2.9 G 4.1 65°F 71°F1014.8 hPa

Wind History for Grand Isle, LA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Galliano, South Lafourche Airport, LA20 mi42 minN 010.00 miFair76°F71°F85%1014.2 hPa

Link to 5 minute data for KXPY

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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
Wed -- 06:34 AM CDT     Sunrise
Wed -- 08:08 AM CDT     Moonrise
Wed -- 01:02 PM CDT     0.79 feet High Tide
Wed -- 07:26 PM CDT     Sunset
Wed -- 09:54 PM CDT     Moonset
Wed -- 11:50 PM CDT     -0.05 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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00.10.10.20.20.30.40.40.50.60.70.70.80.80.80.70.60.50.40.30.20.1-0-0

Tide / Current Tables for Bayou Rigaud, Grand Isle, Mississippi River Delta, Louisiana
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Bayou Rigaud
Click for Map
Wed -- 06:34 AM CDT     Sunrise
Wed -- 08:08 AM CDT     Moonrise
Wed -- 11:44 AM CDT     1.09 feet High Tide
Wed -- 07:26 PM CDT     Sunset
Wed -- 09:53 PM CDT     Moonset
Wed -- 10:52 PM CDT     0.12 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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