Saturday, September23, 2017 L-36.com


Marine Weather and Tides
Mandeville, 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 6:47AMSunset 6:54PM Saturday September 23, 2017 7:42 AM CDT (12:42 UTC) Moonrise 8:56AMMoonset 8:22PM Illumination 8% 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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GMZ530 Lake Pontchartrain And Lake Maurepas- 417 Am Cdt Sat Sep 23 2017
Today..East winds 5 to 10 knots. Waves 1 to 2 feet. Dominant period 4 seconds. Slight chance of showers and Thunderstorms in the late morning and afternoon.
Tonight..Northeast winds 5 to 10 knots. Waves 1 to 2 feet. Dominant period 4 seconds.
Sunday..East winds 10 to 15 knots. Waves 2 feet. Dominant period 4 seconds. Chance of showers and Thunderstorms.
Sunday night..East winds 5 to 10 knots. Waves 1 to 2 feet. Dominant period 4 seconds. Chance of showers and Thunderstorms.
Monday..East winds 5 to 10 knots. Waves 1 foot or less. Dominant period 4 seconds. Chance of showers and Thunderstorms in the morning, then showers and Thunderstorms likely in the afternoon.
Monday night..East winds 5 to 10 knots. Waves 1 foot or less. Dominant period 4 seconds. Chance of showers and Thunderstorms through the night.
Tuesday..East winds near 5 knots. Waves less than 1 foot. Dominant period 4 seconds. Chance of showers and Thunderstorms.
Tuesday night..South winds near 5 knots becoming southwest after midnight, then becoming northwest after midnight. Waves less than 1 foot. Dominant period 4 seconds.
Wednesday..Northeast winds near 5 knots becoming east late in the afternoon. Waves less than 1 foot. Dominant period 4 seconds.
Wednesday night..Southeast winds near 5 knots becoming northwest after midnight. Waves 1 foot or less.
GMZ500 Synopsis Pascagoula To Sw Pass Mississippi- Synopsis Sw Pass Mississippi River To Atchafalaya River- 417 Am Cdt Sat Sep 23 2017
Synopsis..A large ridge of high pressure will continue to cover most of the eastern u.s. Through early next week. Weak easterly waves of lower pressure are expected to move across the northern gulf today and Sunday, then high pressure is expected to rebuild over the region early next week.

7 Day Forecast for Marine Location Near Mandeville, LA
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location: 30.33, -90.08     debug


Area Discussion for - New Orleans/Baton Rouge, LA
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Fxus64 klix 230855
afdlix
area forecast discussion
national weather service new orleans la
355 am cdt Sat sep 23 2017

Synopsis
Note to media and interested others... Missing ASOS observations
at new, asd, mcb, gpt, mob and others are due to a phone line cut
near the air traffic control center in houston, where the obs are
routed through. We do have access by phone when necessary to
retrieve climate information, etc. Restoration time is unknown at
this point.

High pressure at the surface centered over ohio extending
southwestward into texas. Aloft, ridging extends from lake
michigan into texas. A little bit of convection offshore, but none
over land early this morning. A few patches of fog, but nothing
widespread. Temperatures at 3 am are generally in the 70s, but
wouldn't be surprised if one or two spots are in the upper 60s.

Short term
Today should be similar to Friday as upper ridging remains in
place for one more day. Convection should remain on the isolated
side, and be mainly during the afternoon. Highs should once again
reach into the lower 90s. A bit of a weakness in the upper
pattern over the eastern gulf of mexico will gradually drift
northwestward into the local area for Sunday and Monday, bringing
higher rain chances, in the 40-60 percent range. The additional
cloud cover precipitation should hold high temperatures down 2-5
degrees. 35

Long term
Upper weakness may remain close enough to retain isolated to
scattered convection on Tuesday, but ridging builds back in for
Wednesday and much of Thursday with little in the way of
convection expected. High temperatures will return to what we've
seen the last day or two, near or slightly above 90 degrees.

Once hurricane maria finally moves northeastward out of the
western atlantic around Thursday or so, a strong upper trough is
expected to develop over the eastern third of the country. Models
are having a little difficulty agreeing on the exact timing of a
cold frontal passage right now, but at some point Thursday or
Friday, cooler and drier air will begin to move into the area.

Little in the way of precipitation is expected with the frontal
passage. By the time we get to Saturday, overnight lows may
actually fall into the 50s across the northern half of the area,
with highs in the lower 80s. 35

Aviation
Kmsy and kbtr ASOS and khdc AWOS are the only TAF airports that have
observations transmitting, so have dialed into the other sites to
receive observations. At 0830z, the only TAF airport with MVFR was
kmcb with vsby 5sm br while all others remainedVFR. It is possible
a few additional airports could see vsbys drop to 3 to 6 nm in br hz
before 13z, otherwise expectVFR to prevail through the day and
most of tonight. Isolated, mainly afternoon shra tsra is possible
today, but the probability is too low for mention in the tafs at
this time. 22 td

Marine
A large ridge of high pressure covering most of the eastern u.S. Is
expected to persist through early next week. The pressure gradient
is expected to tighten today into Sunday as minor low level surface
wave features in the easterlies (inverted troughs) move west across
the northern gulf. This pattern will cause easterly winds to rise
into the 10 to 15 knot range across most waters with seas building
to 2 to 3 feet over most of the open waters later this morning or
afternoon and continuing into Sunday.

High pressure is then expected to rebuild back into the central gulf
coast region again Monday through Wednesday while hurricane maria
moves very slowly north off the southeast atlantic coast. This will
result in a return to lighter winds that are variable in direction
and flatter seas across the central gulf coast region. A fairly
strong cold front is expected to move through the region late in the
week which will bring rising northerly winds and higher seas
offshore again. 22 td

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 90 69 87 68 20 10 40 30
btr 90 71 89 70 20 10 40 30
asd 90 71 86 71 20 10 40 30
msy 89 75 86 75 20 10 40 30
gpt 88 72 85 72 20 10 50 30
pql 90 70 85 70 20 10 50 30

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
NWCL1 - 8761927 - New Canal, LA 21 mi43 min ENE 9.9 G 11 80°F 83°F1013.7 hPa (+0.7)
FREL1 24 mi43 min ENE 6 G 8.9 81°F 1012.8 hPa (+0.7)77°F
OSTF1 - Stennis Test Facility 25 mi53 min Calm G 0 69°F 1014.5 hPa (+0.7)69°F
CARL1 28 mi43 min 79°F
SHBL1 - 8761305 - Shell Beach, LA 39 mi43 min NE 8.9 G 11 81°F 87°F1013.9 hPa (+0.7)
WYCM6 - 8747437 - Bay Waveland Yacht Club, MS 40 mi43 min NE 6 G 7 76°F 83°F1014.3 hPa (+0.9)
BYGL1 - 8762482 - Bayou Gauche, LA 41 mi43 min Calm G 2.9 76°F 84°F1013.8 hPa (+0.6)

Wind History for New Canal Station, LA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hammond, Hammond Municipal Airport, LA22 mi48 minN 05.00 miFog/Mist72°F68°F88%1014.2 hPa

Wind History from ASD (wind in knots)
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Last 24hrCalmNE4CalmN5CalmCalmCalmN4CalmCalmCalmCalmCalmCalmCalmCalmCalmNE3NE533NE5CalmS7
1 day ago5S3SE3CalmCalmCalmN3SW3CalmCalmCalmCalmCalmCalmCalmN3N3N3NE6N54Calm3S13
2 days agoS7SW6S8S4CalmCalmS3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmW4W43Calm4S3

Tide / Current Tables for Tchefuncta River, Lake Pontchartrain, Louisiana
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Tchefuncta River
Click for Map
Sat -- 06:49 AM CDT     Sunrise
Sat -- 09:56 AM CDT     Moonrise
Sat -- 10:22 AM CDT     0.65 feet High Tide
Sat -- 06:55 PM CDT     Sunset
Sat -- 08:30 PM CDT     0.35 feet Low Tide
Sat -- 09:23 PM CDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.50.50.50.50.50.60.60.60.60.60.60.60.60.60.50.50.40.40.40.40.40.40.4

Tide / Current Tables for Bayou BonFouca, Route 433, Louisiana
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Bayou BonFouca
Click for Map
Sat -- 06:48 AM CDT     Sunrise
Sat -- 09:54 AM CDT     Moonrise
Sat -- 09:59 AM CDT     0.58 feet High Tide
Sat -- 06:54 PM CDT     Sunset
Sat -- 07:40 PM CDT     0.32 feet Low Tide
Sat -- 09:21 PM CDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.40.50.50.50.50.50.50.60.60.60.60.60.50.50.40.40.40.30.30.30.30.30.4

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 (8,2,3,4)
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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.