Wednesday, September20, 2017 L-36.com


Marine Weather and Tides
Golden Meadow, LA

Version 3.4
What's New / NOTES
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.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 6:49AMSunset 7:02PM Wednesday September 20, 2017 11:21 AM CDT (16:21 UTC) Moonrise 6:08AMMoonset 6:36PM Illumination 0% Phase: New Moon; Moon at 29 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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GMZ550 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- 1016 Am Cdt Wed Sep 20 2017
Rest of today..South winds 5 to 10 knots. Seas 1 foot or less. Dominant period 4 seconds.
Tonight..Southeast winds 5 to 10 knots. Seas 1 foot or less. Dominant period 4 seconds.
Thursday..Northeast winds 5 to 10 knots becoming southeast in the afternoon. Seas 1 foot or less. Dominant period 4 seconds.
Thursday night..East winds 5 to 10 knots. Seas 1 foot or less. Dominant period 4 seconds. Slight chance of showers and Thunderstorms in the evening.
Friday..East winds 5 to 10 knots. Seas 1 to 2 feet. Dominant period 5 seconds. Slight chance of showers and Thunderstorms in the afternoon.
Friday night..East winds 5 to 10 knots. Seas 1 to 2 feet. Dominant period 4 seconds.
Saturday..East winds 10 to 15 knots. Seas 1 to 2 feet. Dominant period 4 seconds.
Saturday night..East winds 10 to 15 knots. Seas 2 to 4 feet. Dominant period 5 seconds. Slight chance of showers and Thunderstorms.
Sunday..East winds 10 to 15 knots. Seas 2 to 4 feet. Slight chance of showers and Thunderstorms.
Sunday night..Southeast winds 10 to 15 knots. Seas 2 to 4 feet. Chance of showers and Thunderstorms.
GMZ500 Synopsis Pascagoula To Sw Pass Mississippi- Synopsis Sw Pass Mississippi River To Atchafalaya River- 1016 Am Cdt Wed Sep 20 2017
Synopsis..High pressure will remain centered near the central gulf coast region through the weekend.

7 Day Forecast for Marine Location Near Golden Meadow, LA
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location: 29.13, -90.42     debug


Area Discussion for - New Orleans/Baton Rouge, LA
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Fxus64 klix 201313
afdlix
area forecast discussion
national weather service new orleans la
813 am cdt Wed sep 20 2017

Sounding discussion...

the sounding this morning is unstable with mixed layer CAPE at
1100 j kg. Showers and storms will develop later today, though
with high pressure in place coverage should be isolated and will
be primarily over the cities or along sea lake breeze boundaries.

Winds are southerly at about 10 kts from the sfc to 800 mb then
become westerly aloft.

Krautmann

Prev discussion issued 342 am cdt Wed sep 20 2017
short term...

a broad and weak upper level trough axis extending along the
southeastern coast and into the gulf south will be the main
feature impacting the forecast through Friday. The weak trough
axis aloft will provide just enough upper level forcing to
overcome some weak convective inhibition in the mid-levels. In
the low levels a typical seabreeze cycle will also serve as a
catalyst for the weather expected over the next few days. Expect
to see convection fire up along the seabreeze front from late
morning through the afternoon hours each day. As temperatures wane
and seabreeze weakens in the evening hours, overall convective
activity will also decrease. In fact, the overnight hours should
remain fairly dry both tonight and tomorrow night.

Another driver of our weather will be an increase in overall
atmospheric moisture content both today and tomorrow. Precipitable
water values will range around 1.9 to 2.1 inches through Friday,
and this will allow for slightly more convective coverage through
the short term period. Have chance pops of 30 to 40 percent in the
forecast each afternoon. Temperatures will remain slightly warmer
than average during the daytime hours with highs in the lower 90s
expected across most areas due to continued weak mid-level
subsidence. The increase in atmospheric moisture and dewpoints
will also keep overnight lows somewhat elevated in the lower to
middle 70s. With light boundary layer winds and ample moisture in
place, some patchy fog can be expected to develop each night.

Long term...

over the weekend, a broad and weak closed upper level low should
form on the tail end of the broad trough extending across the
southeast conus. This weak upper level low will keep some
increased omega and forcing in place in the upper levels. Overall,
little change in the sensible weather pattern is expected from
Saturday through Monday from that seen today through Friday. A
seabreeze cycle will continue to dominate the low level weather
pattern, and expect to see scattered showers and thunderstorms
fire up on the seabreeze front beginning in the late morning and
persisting through the afternoon hours. As the seabreeze weakens
due to the loss of differential heating in the evening, convective
activity will also wane. The overnight hours should remain dry,
and some patchy fog could develop each night as boundary layer
flow remains weak. The one big change will be a return to more
normal temperatures as the mid-level ridge and resultant
subsidence comes to an end in response to the upper level low
translating down into the mid-levels. Highs in the upper 80s and
lows in the upper 60s and lower 70s can be expected.

By Tuesday and Wednesday of next week, the broad upper level low
over the area should shift to the north and east as a ridge of
high pressure begins to move in from the west. A deep layer ridge
axis should be firmly in place by Tuesday afternoon, and expect to
see a reduction in precipitable water values to around 1.5 inches
as subsidence increases throughout the atmospheric column. A
strong mid-level cap will also inhibit most convective initiation
throughout the day both Tuesday and Wednesday. As a result, have a
very low pop of less than 20 percent in the forecast. At most, an
isolated shower or thunderstorm may try to form, but the chances
are very low of that occurring. Temperatures will also warm back
into the lower 90s in the afternoon in response to the increased
subsidence and lack of cloud development. However, the drier
airmass will also allow temperatures to cool to more normal levels
at night in the upper 60s and lower 70s. As a result, some patchy
fog could continue to form each night.

Aviation...

as temps climb and lows reach mid 70s fg will be tougher
to come by. But br will still remain a nightly restriction and will
vary from around 1sm up to 5sm. There is a 30% chance of sh ts
activity today. But any particular site being affected will be
relatively small and mention will only be made for those that will
have the best opportunity at getting that 30%.

Marine...

high pressure will remain across the eastern half of the
gulf keeping winds weak and southerly. These conditions are expected
to be maintained through the weekend.

Decision support...

dss code: green.

Deployed: none.

Activation: none.

Activities: none.

Decision support services (dss) code legend
green = no weather impacts that require action.

Blue = long-fused watch, warning, or advisory in effect or
high visibility event.

Yellow = heightened impacts with short-fused watch, warning or
advisory issuances; radar support.

Orange = high impacts; slight to moderate risk severe; nearby tropical
events; hazmat or other large episodes.

Red = full engagement for moderate risk of severe and or
direct tropical threats; events of national significance.

Preliminary point temps pops
Mcb 91 70 91 69 30 10 30 20
btr 92 71 92 71 30 10 40 20
asd 91 72 90 70 30 10 30 20
msy 91 74 91 74 30 10 30 20
gpt 90 73 89 72 30 10 30 20
pql 90 71 90 70 20 10 30 20

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
KXPY 12 mi26 min SSW 6 G 14 86°F 73°F
SPLL1 - South Timbalier Block 52, LA / CSI06 18 mi141 min S 8.9 G 9.9
GRBL1 24 mi141 min S 6 G 8.9 1016.3 hPa (+1.3)
GISL1 - 8761724 - Grand Isle, LA 26 mi51 min SSW 5.1 G 8 85°F 86°F1017.2 hPa
LOPL1 - Louisiana Offshore Oil Port, LA 27 mi72 min 7 G 8 83°F 1 ft1017.1 hPa
KDLP 46 mi26 min SW 4.1 86°F 73°F
BYGL1 - 8762482 - Bayou Gauche, LA 46 mi51 min SSW 2.9 G 4.1 84°F 84°F1017 hPa
KMDJ 47 mi26 min S 5.1 86°F 73°F

Wind History for Grand Isle, LA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Port Fourchon, LA12 mi46 minSSW 710.00 miMostly Cloudy86°F73°F66%1017.3 hPa
Galliano, South Lafourche Airport, LA23 mi46 minSSW 610.00 miMostly Cloudy85°F71°F64%1016.9 hPa

Wind History from XPY (wind in knots)
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Last 24hrS65
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6S6S6S8S8S6S5S5S4S5S5S5S3S44S6S6S5S5S5S7S8
1 day agoE7SE7E8E7SE8SE9S6S7S4S5S4S4S4S5S4S54SW3SW4CalmCalmS4SE43
2 days agoE10E9E8E10E6
G12
SE10SE8SE8SE6SE6SE7SE6SE5SE4CalmSE3CalmCalmCalmCalmCalmNE4E5NE5

Tide / Current Tables for Pelican Islands, Timbalier Bay, Mississippi River Delta, Louisiana
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Pelican Islands
Click for Map
Wed -- 12:30 AM CDT     New Moon
Wed -- 01:57 AM CDT     0.78 feet High Tide
Wed -- 06:09 AM CDT     0.76 feet Low Tide
Wed -- 06:49 AM CDT     Sunrise
Wed -- 07:07 AM CDT     Moonrise
Wed -- 01:34 PM CDT     1.09 feet High Tide
Wed -- 07:00 PM CDT     Sunset
Wed -- 07:36 PM CDT     Moonset
Wed -- 09:27 PM CDT     0.85 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.80.80.80.80.80.80.80.80.80.80.9111.11.11.1110.90.90.90.90.90.9

Tide / Current Tables for Timbalier Island, Timbalier Bay, Mississippi River Delta, Louisiana
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Timbalier Island
Click for Map
Wed -- 12:30 AM CDT     New Moon
Wed -- 04:06 AM CDT     0.78 feet Low Tide
Wed -- 06:49 AM CDT     Sunrise
Wed -- 07:08 AM CDT     Moonrise
Wed -- 11:27 AM CDT     1.11 feet High Tide
Wed -- 07:00 PM CDT     Sunset
Wed -- 07:24 PM CDT     0.87 feet Low Tide
Wed -- 07:36 PM CDT     Moonset
Wed -- 10:59 PM CDT     0.94 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.80.80.80.80.80.80.80.90.911.11.11.11.11.1110.90.90.90.90.90.90.9

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Southeast    EDIT
Geos

Wind Forecast for New Orleans/Baton Rouge, LA (12,3,4,5)
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Ground Weather Radar Station New Orleans/Baton Rouge, LA
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weather_mapweather_map weather_map

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.