Saturday, April29, 2017 L-36.com


Marine Weather and Tides
Golden Meadow, LA

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:19AMSunset 7:40PM Saturday April 29, 2017 6:11 AM CDT (11:11 UTC) Moonrise 8:18AMMoonset 10:18PM Illumination 12% Phase: Waxing Crescent; Moon at 3 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- 336 Am Cdt Sat Apr 29 2017
.small craft advisory in effect through Sunday evening...
Today..Southeast winds 20 to 25 knots. Seas 5 to 8 feet with occasional seas to 10 feet. Dominant period 7 seconds.
Tonight..Southeast winds 25 to 30 knots. Seas 8 to 12 feet with occasional seas to 13 feet. Dominant period 8 seconds. Slight chance of showers and Thunderstorms after midnight.
Sunday..South winds 20 to 25 knots. Seas 8 to 12 feet with occasional seas to 13 feet. Dominant period 9 seconds. Chance of showers and Thunderstorms in the morning, then showers and Thunderstorms in the afternoon.
Sunday night..West winds 20 to 25 knots becoming northwest 15 to 20 knots after midnight. Seas 8 to 12 feet with occasional seas to 13 feet. Dominant period 8 seconds. Waves or seas subsiding to 5 to 8 feet with occasional seas to 10 feet. Dominant period 8 seconds after midnight. Showers and Thunderstorms likely in the evening, then chance of showers and Thunderstorms after midnight.
Monday..Northeast winds 10 to 15 knots. Seas 5 to 8 feet with occasional seas to 9 feet. Dominant period 8 seconds. Waves or seas subsiding to 3 to 6 feet with occasional seas to 6 feet. Dominant period 8 seconds in the afternoon.
Monday night..East winds 5 to 10 knots. Seas 3 to 5 feet. Dominant period 7 seconds.
Tuesday..Southeast winds 10 to 15 knots. Seas 2 to 4 feet. Dominant period 7 seconds.
Tuesday night..Southeast winds 15 to 20 knots. Seas 3 to 5 feet. Dominant period 7 seconds. Chance of showers and Thunderstorms.
Wednesday..South winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas to 6 feet. Chance of showers and Thunderstorms.
Wednesday night..South winds 15 to 20 knots. Seas 4 to 7 feet with occasional seas to 9 feet. Showers and Thunderstorms likely.
GMZ500 Synopsis Pascagoula To Sw Pass Mississippi- Synopsis Sw Pass Mississippi River To Atchafalaya River- 336 Am Cdt Sat Apr 29 2017
Synopsis..A strengthening low pressure system will affect the coastal waters through the weekend. The low will push away from the area by Monday allowing high pressure to settle in for Tuesday.

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 290923
afdlix
area forecast discussion
national weather service new orleans la
423 am cdt Sat apr 29 2017

Short term
What a difference 12 hours makes. Deep moisture has once again
and rapidly moved through the area as it transits northward to
help maintain strong and severe thunderstorms throughout the
center of the country. This is also causing the pressure gradient
to tighten significantly which will be noticed today and Sunday.

Wind speeds today should be within the 20-25mph range gusting to
35mph. Sunday should see 25mph with gusts to 35mph and possibly as
high as 40mph at times. Wind advisories have been posted for
today and they will likely be posted again for Sunday by this
evening.

Severe weather variables are very high today into Sunday but they
are mostly stuck beneath a strong 4c subsident inversion. This
inversion will remain relatively in tact while weakening slowly
through Sunday morning as the cold front approaches. This
inversion should keep the majority of thunderstorm activity from
forming until the front approaches causing the inversion to lift
and weaken enough to allow sh/ts to erupt as the front moves
through. Advection of these severe wx variables will also move
beneath this inversion toward the volatile boundary well to the
north of the area until Sunday. Moisture loading within the
boundary layer will help cause cloud cover at the base of the
inversion as frictional convergence helps the moisture gently rise
as it moves out of the gulf. This could cause light showers to
develop again today.

A 50kt jet at about 870mb will also set up tonight. This will help
lift the boundary layer moisture as well and cause the low level
clouds to move very fast to the northwest tonight and Sunday.

This is what will provide one ingredient for any severe weather
Sunday. Any thunderstorm activity that can produce 20-30mph winds
by momentum transfer to the sfc coupled with the already gradient
wind speeds of 25mph could easily produce 50+mph wind speeds
along the boundary Sunday. This could cause damaging wind gusts,
and this should be the main hazard with any strong or severe
thunderstorms Sunday. The other severe weather parameters will
not be discounted but should not be as prevalent. Since wind
speeds are strong at the sfc and vertical wind direction becomes
more uniform as the boundary approaches, both the vertical and
speed shear variables are expected to be moderate at best once the
inversion gives way. This could cause some weak spin ups that
would be rain wrapped as the line of sh/ts moves through. Wet bulb
zero heights will be around 12k+ft as very warm air produces
temps around -3c at 500mb; so hail, if any, looks to be small.

Rainfall amounts are still expected to be from 2 to 4 inches total
through Sunday night. Most of this is expected with the boundary
as it moves through which would cause this to fall with a
relatively short period. Minor flooding of low lying and poor
drainage areas would also be possible Sunday.

Coastal flooding would be the next biggest item on the list. Areas
that normally receive salt water inundation during times of
abnormal high tide levels will receive water during this scenario
starting today. Tide levels are expected to be 1-2ft above normal
levels through Sunday. Highest levels will be during times of high
tides which will be from late morning through the early afternoon
hours each day. Some of the lowest beach and secondary routes may
observe as much as 3" of salt water over those surfaces today and
as much as 7" Sunday.

Long term
Another round of sh/ts are expected Wednesday into Thursday
morning ahead of another cold front that should move through the
area Thursday morning.

Aviation
Expect MVFR to ifr conditions to prevail this morning as abundant
moisture is in place yielding low CIGS across the forecast area. Low
clouds should break up some and lift for some areas to get into the
vfr range but expect mostly MVFR conditions to prevail throughout
the forecast period. Winds will be elevated today as winds at most
terminals will be around 20 knots out of the south across the entire
area. A few gusts up to 30 knots cannot be ruled out... As well
as an isolated shower or thunderstorm this afternoon. 13/mh

Marine
Not much change in the forecast this morning. The pressure gradient
will remain tight across the coastal waters through the weekend. A
deepening low pressure system over the plains will yield southerly
winds of 20 to 30 knots through Sunday. Small craft advisories are
posted for the entire coastal waters through Sunday evening as the
waters will be hazardous all weekend. There is also an outside
chance that the small craft advisory may have to be upgraded to a
gale warning, especially east of the mississippi river this
afternoon through early Sunday morning. This will have to be watched
as this system evolves. Gulf waters due to these winds and seas of
up to 7 feet. The tightening pressure gradient will result in strong
onshore winds of 25 to 30 knots impacting the coastal waters this
afternoon through Sunday evening. Very rough seas of up to 12 feet
could also impact the open gulf waters during this period. Over the
sounds and lakes waves of up to 6 feet will be possible.

Winds will shift to the northwest late Sunday night and Monday in
the wake of the low pressure system and cold front. Winds should
remain elevated at around 20 knots through morning hours on Monday
and seas will remain rough. Conditions will begin to improve Monday
night and Tuesday as high pressure settles directly over the waters.

Winds will veer back to the east by Tuesday and decrease to between
10 and 15 knots. Seas should also fall back to 2 to 4 feet by
Tuesday morning. 13/mh

Decision support
Dss code... Blue.

Deployed... None.

Activation... None.

Activities... Monitoring severe potential for Sunday.

Decision support service (dss) code legend:
green = no weather impacts that require action
blue = long fused watch/warning/advisory in effect or high
visibility event
yellow = heightened impacts with short fused
watch/warning/advisory issuances; radar support
orange = high impacts - slight to moderate risk of severe weather;
nearby tropical events, hazmat or other large episodes
red = full engagement for moderate risk of severe weather; direct
tropical threats; events of national significance.

Preliminary point temps/pops
Mcb 88 73 78 52 / 30 20 100 50
btr 89 75 78 53 / 30 40 100 40
asd 86 75 80 60 / 20 10 100 70
msy 87 75 82 61 / 20 20 100 60
gpt 84 76 79 62 / 20 10 100 80
pql 84 74 81 63 / 20 10 100 90

Lix watches/warnings/advisories
La... Wind advisory from 6 am this morning to 10 pm cdt this evening
for laz034>037-039-040-046>050-056>072.

Coastal flood advisory until midnight cdt Sunday night for
laz040-050-058-060>064-066>070-072.

Gm... Small craft advisory until midnight cdt Sunday night for gmz530-
532-534-536-538-550-552-555-557-570-572-575-577.

Ms... Wind advisory from 6 am this morning to 10 pm cdt this evening
for msz068>071-077-080>082.

Coastal flood advisory until midnight cdt Sunday night for
msz080>082.

Gm... Small craft advisory until midnight cdt Sunday night for gmz532-
534-536-538-550-552-555-557-570-572-575-577.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KXPY 12 mi36 min SE 15 G 22 77°F 75°F
SPLL1 - South Timbalier Block 52, LA / CSI06 18 mi131 min SE 25 G 28 78°F
GRBL1 24 mi131 min SE 19 G 22 1011.8 hPa (-1.0)
GISL1 - 8761724 - Grand Isle, LA 26 mi53 min SSE 11 G 15 77°F 78°F1012.3 hPa
LOPL1 - Louisiana Offshore Oil Port, LA 27 mi66 min SSE 22 G 24 77°F 6 ft1011.1 hPa
KDLP 46 mi31 min SSE 8.9 G 15 77°F 77°F
BYGL1 - 8762482 - Bayou Gauche, LA 46 mi53 min SE 11 G 15 78°F 78°F1012.5 hPa
KMDJ 47 mi36 min SSE 24 79°F 75°F

Wind History for Grand Isle, LA
(wind in knots)    EDIT      (on/off)   Help
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NW5

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Port Fourchon, LA12 mi36 minSE 15 G 224.00 miFog/Mist77°F75°F94%1012.5 hPa
Galliano, South Lafourche Airport, LA23 mi16 minSSE 11 G 1810.00 miOvercast78°F72°F84%1012.5 hPa

Wind History from XPY (wind in knots)
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1 day agoN7N7N8N10N9N11N8E8E8E7E8E8E7SE10E6SE10SE11SE9
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2 days agoS12
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W9

Tide / Current Tables for Pelican Islands, Timbalier Bay, Mississippi River Delta, Louisiana
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Pelican Islands
Click for Map
Sat -- 01:19 AM CDT     -0.28 feet Low Tide
Sat -- 06:21 AM CDT     Sunrise
Sat -- 09:18 AM CDT     Moonrise
Sat -- 02:03 PM CDT     1.40 feet High Tide
Sat -- 07:36 PM CDT     Sunset
Sat -- 11:18 PM CDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.2-0.3-0.3-0.2-0.100.20.40.60.70.91.11.31.41.41.41.31.210.80.60.30.1-0

Tide / Current Tables for Timbalier Island, Timbalier Bay, Mississippi River Delta, Louisiana
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Timbalier Island
Click for Map
Sat -- 06:22 AM CDT     Sunrise
Sat -- 09:19 AM CDT     Moonrise
Sat -- 11:56 AM CDT     1.44 feet High Tide
Sat -- 07:37 PM CDT     Sunset
Sat -- 11:18 PM CDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.3-0.2-0.100.20.40.60.811.21.31.41.41.41.31.210.80.50.30.1-0.1-0.2-0.3

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 (7,2,3,4)
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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.