Thursday, April19, 2018 L-36.com


Marine Weather and Tides
Grand Isle, LA

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.

Sunrise 6:27AMSunset 7:31PM Thursday April 19, 2018 4:32 AM CDT (09:32 UTC) Moonrise 8:27AMMoonset 10:27PM Illumination 16% Phase: Waxing Crescent; Moon at 4 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- Coastal Waters From Boothville La To Southwest Pass Of The Mississippi River Out 20 Nm- Coastal Waters From Pascagoula Mississippi To Stake Island Out 20 Mile- 1017 Pm Cdt Wed Apr 18 2018
Rest of tonight..West winds 5 to 10 knots. Seas 2 to 3 feet. Dominant period 5 seconds.
Thursday..North winds 10 to 15 knots. Seas 2 to 4 feet. Dominant period 5 seconds.
Thursday night..Northeast winds 15 to 20 knots. Seas 3 to 5 feet. Dominant period 4 seconds.
Friday..Northeast winds 15 to 20 knots. Seas 3 to 5 feet. Dominant period 4 seconds.
Friday night..East winds 10 to 15 knots. Seas 2 to 4 feet. Dominant period 4 seconds.
Saturday..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas to 6 feet. Dominant period 5 seconds. Slight chance of showers and Thunderstorms.
Saturday night..Southeast winds 15 to 20 knots. Seas 3 to 6 feet with occasional seas to 8 feet. Dominant period 7 seconds. Chance of showers and Thunderstorms.
Sunday..Southwest winds near 15 knots. Seas 3 to 6 feet. Showers and Thunderstorms likely.
Sunday night..Northwest winds 10 to 15 knots. Seas 3 to 5 feet. Chance of showers.
Monday..Northwest winds 10 to 15 knots. Seas 3 to 5 feet.
Monday night..North winds 10 to 15 knots. Seas 3 to 5 feet. Slight chance of showers.
GMZ500 Synopsis Pascagoula To Sw Pass Mississippi- Synopsis Sw Pass Mississippi River To Atchafalaya River- 1017 Pm Cdt Wed Apr 18 2018
Synopsis..A weak cold front will push across the coastal waters Thursday morning. High pressure will settle over the area Friday and Saturday. Another frontal system will begin to affect the northern gulf Saturday night and pass through the coastal waters late on 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 190930
afdlix
area forecast discussion
national weather service new orleans la
430 am cdt Thu apr 19 2018

Discussion
Relatively quiet weather expected for the remainder of this week. A
clipper low is racing east across the ohio river valley this
morning. A cold front associated with this feature is headed towards
the cwa. Latest surface observations show this boundary to be
located right on the doorstep of the CWA in southwest ms. Dewpoints
are dropping about 15 degrees right at fropa. This 'gulf coast
dryline' won't have any precip as it passes through but will drop
temperatures from previous warm days. Expect highs to be about 5 to
10 degrees cooler today. The more significant change in air mass
will show Friday morning when lows bottom out in the mid 40s to mid
50s which is 15 to 20 degrees cooler than this morning. Surface high
pressure building in from the north will maintain these below normal
temps through Friday. Expect mostly clear skies with highs around
70.

The next weather impact will be coming this weekend. Models are
still in good agreement on timing and intensity... Showing an upper
low coming into the west coast today and tracking east to the
southern plains by Saturday evening. The low looks like it will pass
closer than normal to the area, right across arkansas and northern
ms al Sunday night. This will bring a surface low with cold and warm
fronts appendant to it. Model soundings do show quite a bit of bulk
shear (as expected) but with limited instability. CAPE values of up
to 500j kg most unstable and mixed layer are quite meek for this
time of year. SPC outlooked the area as marginal risk for severe
storms and that seems quite appropriate. The bulk of convection will
impact the area from Sunday 06z to Monday 00z, basically Sunday.

Therefore have increased pops into the 70 to 80% range.

Cooler and drier air will filter into the region Monday. There could
be a few lingering showers north of i-12 as mid upper level moisture
wraps around the upper low before it ejects eastward. Upper ridge
will quickly move in Tuesday through Thursday. This will result in a
quick rebound of temps back to climo.

Meffer

Aviation
Cold front is expected to push southeast through all the taf
airports from northwest to southeast between 09-13z with winds
shifting from southwest and west to northwest and north. Some multi-
layered clouds with mostlyVFR level bases have thickened the last
few hours, and some brief MVFR CIGS mostly 020-030 may occur at a
few airports in advance of the frontal passage. Also, some ifr to
lifr in patchy fog will continue in advance of front at khum. Some
very isolated and very light brief showers may develop, but no
impacts to airports are anticipated. After 13z,VFR conditions
should prevail with skies becoming clr to few by 16z. The
northwest north winds will gust around 15 knots at times this
morning then prevailing winds will be stronger at kmsy and knew
tonight. 22 td

Marine
Cold front will push southeast through the marine area this morning
with high pressure building into the lower mississippi valley this
afternoon through tomorrow. Cooler and drier air and the stout
pressure gradient will allow stronger north and northeast boundary
layer winds of 20 to 25 knots to mix down to the water surfaces
tonight, so a small craft advisory has been issued starting at 7 pm
on the tidal lakes and 10 pm elsewhere valid through 6 am tomorrow
morning. The pressure gradient will relax tomorrow with winds
expected to quickly ease down to 10 to 15 knots by midday. As the
center of the high pressure ridge shifts east, winds will veer to
east and rise back to 15 to 20 knots over eastern waters late Friday
night into Saturday, then southeast winds are expected to return
Saturday night with speeds ranging from near 15 knots west to 15 to
20 knots east. This will also result in rising tide levels that will
combine with spring tides to produce higher than predicted values
and possibly higher than the high average tide during the high tide
cycle Saturday afternoon.

A low pressure system and cold front are expected to push through on
Sunday with winds shifting to southwest then northwest at speeds of
at least 15 knots with higher gusts expected with any squalls
associated with thunderstorms. 22 td
decision support...

dss code: blue.

Deployed: none.

Activation: none.

Activities: river flooding.

Small craft advisory.

Marginal severe risk Saturday night Sunday morning

Preliminary point temps pops
Mcb 68 43 68 47 10 0 0 10
btr 72 44 70 50 10 0 0 10
asd 74 46 69 48 10 0 0 10
msy 75 53 69 57 10 0 0 10
gpt 77 49 70 55 10 0 0 10
pql 75 47 70 50 10 0 0 10

Lix watches warnings advisories
La... None.

Gm... Small craft advisory from 10 pm this evening to 6 am cdt Friday
for gmz532-536-538-550-552-555-557-570-572-575-577.

Small craft advisory from 7 pm this evening to 6 am cdt Friday
for gmz530-534.

Ms... None.

Gm... Small craft advisory from 10 pm this evening to 6 am cdt Friday
for gmz536-538-550-552-555-557-570-572-575-577.

Small craft advisory from 7 pm this evening to 6 am cdt Friday
for gmz534.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
GISL1 - 8761724 - Grand Isle, LA 7 mi45 min WNW 8.9 G 11 71°F 73°F1018.5 hPa
KXPY 10 mi38 min W 5.1 70°F 66°F
LOPL1 - Louisiana Offshore Oil Port, LA 22 mi87 min WNW 5.1 G 8 70°F 2 ft1019.1 hPa
KDLP 27 mi38 min W 7 72°F 64°F
SPLL1 - South Timbalier Block 52, LA / CSI06 32 mi93 min W 7 G 8
PSTL1 - 8760922 - Pilot's East, SW Pass, LA 39 mi45 min WNW 5.1 G 6 65°F 57°F1019.1 hPa
BURL1 - Southwest Pass, LA 39 mi33 min WNW 7 G 7 68°F 1018.7 hPa (-0.0)66°F
KMDJ 41 mi38 min WNW 7 72°F 64°F
PILL1 42 mi45 min W 1.9 G 1.9 62°F 57°F1018.3 hPa
BYGL1 - 8762482 - Bayou Gauche, LA 45 mi45 min W 1.9 G 2.9 65°F 72°F1018.4 hPa

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 mi58 minW 510.00 miPartly Cloudy70°F66°F88%1018.6 hPa
Galliano, South Lafourche Airport, LA20 mi38 minN 05.00 miFog/Mist63°F60°F92%1018.3 hPa

Wind History from XPY (wind in knots)
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Last 24hrSW11S11
G16
S8S10S11
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S11SW10W9W8W8SW7W9W7S7SW5SW6SW4SW4SW3SW5SW3SW4W5W6
1 day agoSW4SW3CalmCalmSW5SW7S4S6SE10SE9S7S8S10S10S8S8
G13
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2 days agoN7NW5NW7N9NW11NW11
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NW11NW11W12W11W10W5CalmNW3W6W7W6SW5SW4SW5SW4

Tide / Current Tables for Caminada Pass (bridge), Mississippi River Delta, Louisiana
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Caminada Pass (bridge)
Click for Map
Thu -- 12:33 AM CDT     -0.16 feet Low Tide
Thu -- 06:29 AM CDT     Sunrise
Thu -- 09:26 AM CDT     Moonrise
Thu -- 02:03 PM CDT     0.98 feet High Tide
Thu -- 07:29 PM CDT     Sunset
Thu -- 11:27 PM CDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.2-0.2-0.1-0.100.10.20.30.50.60.70.80.91110.90.80.70.50.30.20-0.1

Tide / Current Tables for Bayou Rigaud, Grand Isle, Mississippi River Delta, Louisiana
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Bayou Rigaud
Click for Map
Thu -- 06:29 AM CDT     Sunrise
Thu -- 09:26 AM CDT     Moonrise
Thu -- 12:57 PM CDT     1.32 feet High Tide
Thu -- 07:28 PM CDT     Sunset
Thu -- 11:26 PM CDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-000.10.20.30.50.60.80.91.11.21.21.31.31.31.21.110.80.60.40.20.1-0

Weather Map and Satellite Images
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wmap_A
GOES 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.
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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 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.