Friday, August18, 2017 L-36.com


Marine Weather and Tides
Metairie, 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 6:29AMSunset 7:39PM Friday August 18, 2017 11:14 AM CDT (16:14 UTC) Moonrise 2:07AMMoonset 4:13PM Illumination 14% Phase: Waning Crescent; Moon at 26 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- 945 Am Cdt Fri Aug 18 2017
Rest of today..West winds 5 to 10 knots. Waves 1 foot or less. Dominant period 4 seconds. Slight chance of showers and Thunderstorms in the afternoon.
Tonight..West winds 5 to 10 knots. Waves 1 foot or less. Dominant period 4 seconds.
Saturday..Northwest winds 5 to 10 knots becoming west late in the afternoon. Waves 1 foot or less. Dominant period 4 seconds. Chance of showers and Thunderstorms.
Saturday night..West winds 5 to 10 knots. Waves 1 foot or less. Dominant period 4 seconds.
Sunday..North winds 5 to 10 knots becoming east in the afternoon. Waves 1 foot or less. Dominant period 4 seconds. Chance of showers and Thunderstorms.
Sunday night..Southeast winds 5 to 10 knots. Waves 1 foot or less. Dominant period 4 seconds. Slight chance of showers and Thunderstorms.
Monday..Southeast winds 5 to 10 knots. Waves 1 foot or less. Dominant period 4 seconds. Chance of showers and Thunderstorms.
Monday night..East winds 5 to 10 knots. Waves 1 foot or less. Dominant period 4 seconds. Slight chance of showers and Thunderstorms.
Tuesday..Southeast winds 5 to 10 knots. Waves 1 foot or less. Chance of showers and Thunderstorms.
Tuesday night..South winds 5 to 10 knots becoming west after midnight. Waves 1 foot or less.
GMZ500 Synopsis Pascagoula To Sw Pass Mississippi- Synopsis Sw Pass Mississippi River To Atchafalaya River- 945 Am Cdt Fri Aug 18 2017
Synopsis..High pressure will remain in control of the coastal waters through early next week.

7 Day Forecast for Marine Location Near Metairie, LA
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location: 30.03, -90.11     debug


Area Discussion for - New Orleans/Baton Rouge, LA
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Fxus64 klix 181316
afdlix
area forecast discussion
national weather service new orleans la
816 am cdt Fri aug 18 2017

Sounding discussion...

the sounding this morning indicates slightly less influence from
the passing high pressure aloft. Pw is up to 2.0 inches and the
subtle low level subsidence inversion from yesterday is reduced.

Mixed layer CAPE is at 1300 j kg. The low level temperature
profile is warm, about 90% in the climatology, and will mix down
to hot surface conditions today. It will take again until late
this afternoon for scattered showers and storms to develop.

Coverage is expected to be low. Winds are light and westerly
through 400 mb then variable above.

Krautmann

Prev discussion issued 336 am cdt Fri aug 18 2017
short term...

today will be the end of a short period of lower pops and the return
to a more typical wet mid august regime. This pattern will persist
through at least this weekend and possibly into next week. An upper
level ridge that was centered near the northern gulf of mexico has
been suppressed by a trough thats moving across the mid-mississippi
and ohio river valleys. Strong daytime heating and decreased
subsidence will allow for afternoon thunderstorms to develop, with
higher coverage in northern portions of the forecast area that are
closer to the trough. Model soundings indicate an inverted-v profile
in the lower levels which suggests that the main threat with storms
will be downburst winds. Some could produce marginally severe winds.

Propagation in general should be NW to SE but outflow dominated
cells could have movements outside of that main direction for that
reason.

From a temperature standpoint, did consider a heat advisory. Daytime
highs should be similar to yesterday, 90 to 95, and dewpoints in the
mid 70s. Those numbers didn't quite yield 108+ heat index advisory
criteria and likely will have enough mixing to keep dewpoints low
enough during peak heating. Although an isolated location may touch
criteria, the overall impacted areas should be too few to justify an
advisory.

A secondary trough will dip out of canada into the northern plains
tonight and cross the great lakes Saturday. This feature will track
on a more west to east direction than the previous which will limit
subsidence over the area. Meanwhile, a tutt low (currently seen
moving west across the bahamas) will be tracking west across the
gom. This feature in combination with trough to the north will
enhance daytime convection and allow for numerous showers and
thunderstorms to develop Saturday and Sunday. Coverage should easily
be in the 50%ish range.

Long term...

an upper ridge building from the east and try to extend towards the
cwa during the first half of next week. The aforementioned tutt low
will be slowly progressing westward towards the NW gulf. Moisture
drawn onshore will keep rain chances higher through Tuesday. Moving
into mid week, models indicate a broad long wave trough will send a
frontal boundary towards the region. This will keep the CWA in an
enhanced pop development pattern.

Meffer
aviation... Tsra to start for sites over the northern half of
the area on and off through the day. Development to start during the
afternoon for the southern half of the area. Wind gusts could be
strong with some of this activity as well. Ceilings generally sct-bkn
at 030 to 040 north this morning and south during the afternoon.VFR
conditions expected outside convective locations.

Marine... No changes as high pressure remains the dominant
factor over the northern gulf. Diurnal fluctuations will remain the
main driver of winds. With most nights look for a weak enhanced jet
over the waters east of the ms delta where winds could bump up to 10-
15 knots at times. Seas will remain in the 2-3 ft range or less.

Dss code: yellow.

Deployed: nohsep.

Activation: none.

Activities: dss support for nohsep; monitoring convective trends
river flooding; and heat advisory.

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 92 74 91 74 40 10 60 10
btr 92 76 92 75 20 10 50 10
asd 94 77 92 76 30 10 50 10
msy 93 77 92 78 20 10 50 20
gpt 91 77 90 77 40 20 40 20
pql 93 76 92 75 40 20 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
NWCL1 - 8761927 - New Canal, LA 0 mi44 min NW 2.9 G 6 86°F 86°F1018.1 hPa
CARL1 7 mi44 min 85°F
FREL1 17 mi44 min W 1 G 4.1 89°F 1016.9 hPa78°F
BYGL1 - 8762482 - Bayou Gauche, LA 23 mi44 min NNW 1.9 G 8.9 86°F 87°F1018.3 hPa
SHBL1 - 8761305 - Shell Beach, LA 26 mi44 min NW 8.9 G 11 85°F 89°F1018.1 hPa
OSTF1 - Stennis Test Facility 35 mi84 min WNW 5.8 G 7.8 86°F 1018.1 hPa (+0.7)78°F
WYCM6 - 8747437 - Bay Waveland Yacht Club, MS 46 mi44 min NW 7 G 9.9 86°F 86°F1017.8 hPa

Wind History for New Canal Station, LA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
New Orleans, New Orleans Lakefront Airport, LA4 mi81 minWNW 810.00 miFair87°F80°F80%1017.3 hPa
New Orleans, New Orleans International Airport, LA8 mi81 minNW 510.00 miPartly Cloudy86°F79°F80%1018.3 hPa
New Orleans Naval Air Station - Alvin Callender Field, LA15 mi2.3 hrsW 510.00 miPartly Cloudy82°F80°F94%1017.4 hPa

Wind History from MSY (wind in knots)
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Last 24hrSW5NW6W6SE6SE4CalmS6S10S7S5S5S4SW3SW4SW4W3W3W3CalmCalmW3NW7NW5W5
1 day agoS8S7SW4S10S8N9SE5S3CalmE5E5E3SE4S3S3CalmS4W3CalmCalmS4SW4SW7W7
2 days agoCalmCalmSE43CalmS9S6S7CalmCalmS3S4SE6SE5S4CalmS3SE5SE4S5SE4SE5S5S7

Tide / Current Tables for New Canal USCG station, Lake Pontchartrain, Louisiana
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New Canal USCG station
Click for Map
Fri -- 03:07 AM CDT     Moonrise
Fri -- 04:09 AM CDT     0.02 feet Low Tide
Fri -- 06:29 AM CDT     Sunrise
Fri -- 05:12 PM CDT     Moonset
Fri -- 05:29 PM CDT     0.49 feet High Tide
Fri -- 07:38 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.10.10.10000.10.10.10.20.20.30.30.40.40.50.50.50.50.50.40.40.30.3

Tide / Current Tables for Michoud Substation, ICWW, Louisiana
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Michoud Substation
Click for Map
Fri -- 03:06 AM CDT     Moonrise
Fri -- 06:29 AM CDT     Sunrise
Fri -- 12:48 PM CDT     1.79 feet High Tide
Fri -- 05:11 PM CDT     Moonset
Fri -- 07:37 PM CDT     Sunset
Fri -- 11:34 PM CDT     -0.17 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.100.20.30.50.70.91.11.31.51.61.71.81.81.71.61.41.20.90.60.30.1-0.1-0.2

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.