Sunday, December16, 2018 L-36.com


Marine Weather and Tides
Grand Isle, LA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:48AMSunset 5:04PM Sunday December 16, 2018 8:13 PM CST (02:13 UTC) Moonrise 1:04PMMoonset 12:31AM Illumination 71% 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 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- 301 Pm Cst Sun Dec 16 2018
Tonight..Northeast winds 10 to 15 knots. Seas 2 to 4 feet. Dominant period 4 seconds.
Monday..Northeast winds 10 to 15 knots. Seas 1 to 2 feet. Dominant period 4 seconds.
Monday night..Northeast winds 5 to 10 knots. Seas 1 to 2 feet. Dominant period 4 seconds.
Tuesday..East winds 10 to 15 knots. Seas 1 to 2 feet. Dominant period 4 seconds.
Tuesday night..East winds 10 to 15 knots. Seas 1 to 2 feet. Dominant period 4 seconds. Slight chance of showers after midnight.
Wednesday..South winds 10 to 15 knots. Seas 2 to 4 feet. Dominant period 4 seconds. Showers likely through the day. Slight chance of Thunderstorms in the afternoon.
Wednesday night..West winds 15 to 20 knots. Seas 2 to 4 feet. Dominant period 5 seconds. Chance of showers.
Thursday..Northwest winds 25 to 35 knots. Seas 3 to 6 feet. Dominant period 5 seconds. Seas building to 6 to 10 feet with occasional seas to 11 feet in the afternoon. Dominant period 5 seconds in the afternoon. Slight chance of showers.
Thursday night..Northwest winds 25 to 35 knots. Seas 12 to 16 feet with occasional seas to 20 feet. Dominant period 6 seconds. Slight chance of showers.
Friday..Northwest winds 25 to 30 knots. Seas 12 to 16 feet with occasional seas to 19 feet. Dominant period 5 seconds. Seas subsiding to 10 to 14 feet with occasional seas to 15 feet in the afternoon. Dominant period 5 seconds in the afternoon.
Friday night..Northwest winds 20 to 25 knots easing to 10 to 15 knots after midnight. Seas 6 to 10 feet with occasional seas to 11 feet. Dominant period 5 seconds. Seas subsiding to 4 to 7 feet with occasional seas to 8 feet after midnight. Dominant period 5 seconds after midnight.
GMZ500 Synopsis Pascagoula To Sw Pass Mississippi- Synopsis Sw Pass Mississippi River To Atchafalaya River- 301 Pm Cst Sun Dec 16 2018
Synopsis..High pressure will remain over the coastal waters through Tuesday. An area of low pressure will then begin to affect the coastal waters on Wednesday as it strengthens over the southern plains. This low will drive a strong cold front through the area on Thursday. High pressure will then build in for the upcoming 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 162120
afdlix
area forecast discussion
national weather service new orleans la
320 pm cst Sun dec 16 2018

Short term
A stubborn low overcast stratus deck associated with low-mid level
lows over carolina is slowly eroding from both west of btr and
east over ms coast. Expect clearing to continue as upper low to
east pulls away from region and subsidence becomes more dominate.

Southeast la will be last areas to clear late afternoon or early
evening.

Mid - upper ridge builds over region next 36 hours should make
for warmer and dry weather weather through Tuesday. Some high
cloudiness moving into region - especially on Tuesday in advance
of developing trough over SW united states may lower high
temperatures a few degrees than otherwise expected.

Long term
Ecmwf and GFS both remain consistent in forecasting a deepening
mid upper level trough over southwest united state and southern
plains Tuesday into Wednesday. The trough continues to move
eastward and deepen with both global models forecasting a closed
low evolving at the base of the trough in the Thursday time from
over la - ms region. Expect showers and isolated thunderstorms to
spread across the Wednesday as the initial shortwave trough and
surface low moves through area. As the upper low develops at the
base of trough and surface low deepens over the southeast u.S.,
the more significant precipitation will develop east of our
region. However expect showers to wrap around the west side of the
low - with Thursday forecast to be cloudy, breezy to windy, along
with scattered showers. Temps will be cool ranging from the upper
40s to lower 50s. Friday and Saturday conditions should improve
as low over the eastern u.S. Move northeast and zonal westerly mid
level flow dominates region allowing skies to clear and
temperatures moderate.

Aviation A persistent deck of low ceilings ranging from 1500 to
2500 feet continue to slowly burn off this afternoon at most of the
terminals. This cloud deck should fully erode by 00z, and expect to
seeVFR conditions take hold at all of the terminals from 00z
through around 06z. After 06z, the combination of light winds and
mostly clear skies should allow for a round of fog to form over
inland areas. Kbtr, khdc, kmcb, and khum are most likely to see fog
form, and have a period of ifr and even lifr visibility and ceiling
restrictions in the forecast for these terminals mainly between 08z
and 14z. After 14z, a very dry airmass in the low to mid-levels
will allow the fog to quickly clear and prevailingVFR conditions to
take hold at all of the terminals. 32

Marine Fairly benign conditions are expected over the coastal
waters through Tuesday as winds of around 10 knots and seas of 1 to
3 feet persist beneath a ridge of high pressure. Conditions will
begin to deteriorate on Wednesday as a strong area of low pressure
begins to approach the region. Winds will increase to 15 to 20
knots from the south, and seas should increase to 3 to 5 feet. By
Thursday, the strengthening area of low pressure will move to the
east of the region, and strong northwest flow will begin to develop.

Winds will quickly increase to gale force Thursday afternoon and
remain so through Friday morning. These gale force winds will also
produce very rough seas of around 15 feet over the open gulf waters.

Conditions should begin to improve by Friday night and Saturday as
high pressure builds in and winds decrease back to 10 to 15 knots. 32

Decision support
Dss code: green.

Deployed: none.

Activation: none.

Activities: none.

Preliminary point temps pops
Mcb 42 65 41 66 0 0 0 0
btr 44 66 42 65 0 0 0 0
asd 44 64 43 64 0 0 0 0
msy 47 63 46 64 0 0 0 0
gpt 45 63 44 63 0 0 0 0
pql 43 64 42 64 0 0 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 mi55 min N 8.9 G 9.9 52°F 61°F1025.1 hPa
KXPY 10 mi38 min N 5.1 52°F 48°F
LOPL1 - Louisiana Offshore Oil Port, LA 22 mi65 min NNE 11 G 13 54°F 2 ft1025.1 hPa46°F
SPLL1 - South Timbalier Block 52, LA / CSI06 32 mi133 min NNE 9.9 G 14 55°F
BURL1 - Southwest Pass, LA 39 mi73 min NNE 8.9 G 11 51°F 1024.2 hPa (+0.0)47°F
PSTL1 - 8760922 - Pilot's East, SW Pass, LA 39 mi55 min NNE 8.9 G 8.9
KMDJ 41 mi38 min NE 8 54°F 46°F
PILL1 42 mi55 min N 5.1 G 6 48°F 46°F1024.4 hPa
BYGL1 - 8762482 - Bayou Gauche, LA 45 mi55 min WNW 2.9 G 2.9 49°F 54°F1025.8 hPa

Wind History for Grand Isle, LA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Port Fourchon, LA10 mi18 minN 410.00 miA Few Clouds50°F48°F94%1025.7 hPa
Galliano, South Lafourche Airport, LA20 mi18 minN 010.00 miFair44°F39°F83%1025.7 hPa

Wind History from XPY (wind in knots)
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Last 24hrNW11NW9NW8NW5NW8NW7NW8N7
G13
NW8N6NW8N7N7N7NE5N7N7NE7N7N9N9N10N6N6
1 day agoW15
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2 days agoS4S5S4SW5S5W6W8
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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
Sun -- 12:31 AM CST     Moonset
Sun -- 06:47 AM CST     Sunrise
Sun -- 01:03 PM CST     Moonrise
Sun -- 01:04 PM CST     0.14 feet Low Tide
Sun -- 05:04 PM CST     Sunset
Sun -- 09:28 PM CST     0.43 feet High Tide
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 Grand Isle, USCG Station, East Point, Louisiana
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Grand Isle
Click for Map
Sun -- 12:31 AM CST     Moonset
Sun -- 06:47 AM CST     Sunrise
Sun -- 11:13 AM CST     0.25 feet Low Tide
Sun -- 01:03 PM CST     Moonrise
Sun -- 05:03 PM CST     Sunset
Sun -- 08:03 PM CST     0.56 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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Weather Map and Satellite Images
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GOES Local Image of    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.
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Wind Forecast for New Orleans/Baton Rouge, LA (21,6,7,8)
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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 numerious 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.