Sunday, August20, 2017 L-36.com


Marine Weather and Tides
Madisonville, 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 6:31AMSunset 7:38PM Sunday August 20, 2017 10:31 AM CDT (15:31 UTC) Moonrise 4:13AMMoonset 5:59PM Illumination 3% Phase: Waning Crescent; Moon at 28 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- 936 Am Cdt Sun Aug 20 2017
Rest of today..East winds 5 to 10 knots. Waves 1 foot or less. Dominant period 4 seconds. Chance of showers and Thunderstorms through the day.
Tonight..Southeast winds 5 to 10 knots. Waves 1 foot or less. Dominant period 4 seconds.
Monday..Southeast winds 5 to 10 knots. Waves 1 to 2 feet. Dominant period 4 seconds. Chance of showers and Thunderstorms.
Monday night..East winds 5 to 10 knots. Waves 1 to 2 feet. Dominant period 4 seconds. Slight chance of showers and Thunderstorms.
Tuesday..Southeast winds 5 to 10 knots. Waves 1 foot or less. Dominant period 4 seconds. Chance of showers and Thunderstorms.
Tuesday night..South winds 5 to 10 knots becoming west after midnight. Waves 1 foot or less. Dominant period 4 seconds. Slight chance of showers and Thunderstorms.
Wednesday..Northwest winds near 5 knots becoming north early in the afternoon, then becoming west late in the afternoon. Waves 1 foot or less. Dominant period 4 seconds. Chance of showers and Thunderstorms.
Wednesday night..West winds 5 to 10 knots. Waves 1 foot or less. Dominant period 4 seconds. Chance of showers and Thunderstorms.
Thursday..North winds 5 to 10 knots. Waves 1 foot or less. Dominant period 4 seconds. Chance of showers and Thunderstorms.
Thursday night..North winds 5 to 10 knots. Waves 1 foot or less. Chance of showers and Thunderstorms.
GMZ500 Synopsis Pascagoula To Sw Pass Mississippi- Synopsis Sw Pass Mississippi River To Atchafalaya River- 936 Am Cdt Sun Aug 20 2017
Synopsis..High pressure will remain over the coastal waters through early next week.

7 Day Forecast for Marine Location Near Madisonville, LA
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location: 30.38, -90.16     debug


Area Discussion for - New Orleans/Baton Rouge, LA
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Fxus64 klix 201323
afdlix
area forecast discussion
national weather service new orleans la
823 am cdt Sun aug 20 2017

Sounding discussion
Routine flight terminated over southwest lake pontchartrain at a
height of 104,000 feet, or 19.7 miles above the surface.

Some drying has occurred with the precipitable water value down to
1.89 inches, which is slightly above average for late august.

Forecast CAPE is just over 2400 j kg with a lifted index of -6.

Mid level lapse rates are around 6.2c km. Downdraft CAPE is 671
j kg, which is quite a bit lower than yesterday. Convective
temperature is 89 degrees, so it'll be a few hours before things
start percolating. Freezing level this morning near 15,000 feet,
with a -20c level at 27,400 feet and wet bulb zero near 13,000
feet.

Winds in the lower levels were rather light this morning,
generally less than 10 knots until nearly 500 mb. Easterly winds
between 500 and 400 mb, then northerly from 350 mb to 100 mb. Max
wind of 40 knots was measured at 34,000 feet. 35

Decision support
Prev discussion issued 335 am cdt Sun aug 20 2017
short term...

a temporary reprieve from numerous showers and thunderstorms is
likely to take place today across the forecast area. Upper level
analysis shows a weak ridge centered through east texas and northern
louisiana with a trough moving east across the northeastern conus.

The ridge will slide across the CWA today as it is absorbed by a
more dominant western atlantic high pressure that will be extending
into the southeast us. Increased subsidence in combination with
strong mid level drying (pw dropping to 1.7" per model soundings)
will significantly limit convective development. Therefore, have
dropped pops down to 20-30% for today and that may be generous.

Long term...

the upper ridge centered in the western atlantic will generally
remain in place through early next week. A tutt low, currently seen
on WV moving west across the eastern gulf of mexico, will be
tracking west across the gom Monday. This movement will erode a
portion of the ridge over the CWA and in combination with daytime
heating will enhance convection. Expecting rainfall coverage to jump
back up to around 40%. A repeat looking likely again on Tuesday as
synoptic changes will be minimal. A slight increase in column
moisture will promote more numerous convection.

Moving into the mid and latter half of the week, models show a broad
long wave trough dipping out of canada and tracking across the
appalachian mountains. A weak cold front associated with this trough
will slowly sag into and stall across the region. It will become the
focus for continued daily rainfall, with pops likely 50% or above
through Friday.

Meffer
aviation... Tsra will show less coverage today. There
will not be enough probability to include in this TAF cycle.VFR
conditions should be the prevailing conditions.

Marine... No changes as high pressure remains the dominant
factor over the northern gulf. Diurnal fluctuations will remain the
main driver of winds. Most nights, look for a weak enhanced jet over
the waters east of the ms delta where winds could bump up to near 10
knots. Seas will remain around 2 ft or less.

Dss code: yellow.

Deployed: nohsep.

Activation: none.

Activities: dss support for nohsep; monitoring convective trends.

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 93 73 91 73 30 10 40 10
btr 94 75 92 74 30 10 40 10
asd 93 75 91 75 30 10 30 20
msy 93 77 90 78 30 10 30 20
gpt 92 76 90 76 20 10 30 20
pql 94 73 90 73 20 10 30 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
FREL1 23 mi43 min ENE 6 G 8 86°F 1016.9 hPa78°F
NWCL1 - 8761927 - New Canal, LA 25 mi43 min ENE 8 G 9.9 83°F 87°F1017.7 hPa
OSTF1 - Stennis Test Facility 29 mi41 min Calm G 1.9 84°F 1018.2 hPa (+1.3)75°F
CARL1 31 mi43 min 85°F
BYGL1 - 8762482 - Bayou Gauche, LA 43 mi43 min ENE 1.9 G 5.1 87°F 88°F1017.9 hPa
WYCM6 - 8747437 - Bay Waveland Yacht Club, MS 44 mi43 min NNE 4.1 G 5.1 81°F 86°F1018 hPa
SHBL1 - 8761305 - Shell Beach, LA 44 mi43 min ENE 8.9 G 9.9 85°F 89°F1017.9 hPa

Wind History for New Canal Station, LA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hammond, Hammond Municipal Airport, LA17 mi56 minN 010.00 miFair84°F71°F66%1017.9 hPa
Slidell, Slidell Airport, LA18 mi38 minVar 410.00 miFair85°F73°F70%1017.6 hPa
New Orleans, New Orleans Lakefront Airport, LA24 mi38 minENE 610.00 miFair86°F75°F72%1017.3 hPa

Wind History from HDC (wind in knots)
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Last 24hrN6NW5NW8NW5N6SE6NE7N5CalmCalmCalmE3NW5CalmCalmCalmCalmCalmCalmCalmCalmE5E3Calm
1 day agoNW6NW6NW7NW6NW7W5W6NW3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNW6NW7NW6
2 days agoW8SW7W6NW7W7W5W4NW4CalmCalmCalmCalmCalmCalmCalmCalmSW3CalmCalmCalmCalmW3W7W6

Tide / Current Tables for Tchefuncta River, Lake Pontchartrain, Louisiana
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Tchefuncta River
Click for Map
Sun -- 05:12 AM CDT     Moonrise
Sun -- 06:21 AM CDT     -0.05 feet Low Tide
Sun -- 06:30 AM CDT     Sunrise
Sun -- 06:58 PM CDT     Moonset
Sun -- 07:36 PM CDT     Sunset
Sun -- 07:47 PM CDT     0.78 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.30.20.10-0-0.1-0-00.10.10.20.30.40.40.50.60.70.70.80.80.80.70.6

Tide / Current Tables for Bayou BonFouca, Route 433, Louisiana
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Bayou BonFouca
Click for Map
Sun -- 05:11 AM CDT     Moonrise
Sun -- 05:31 AM CDT     -0.05 feet Low Tide
Sun -- 06:29 AM CDT     Sunrise
Sun -- 06:56 PM CDT     Moonset
Sun -- 07:23 PM CDT     0.70 feet High Tide
Sun -- 07:35 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.30.20.10-0-0-0-000.10.20.20.30.40.40.50.60.60.70.70.70.70.60.5

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 (11,2,3,4)
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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.