Friday, April20, 2018 L-36.com


Marine Weather and Tides
Mandeville, LA

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.

Sunrise 6:24AMSunset 7:31PM Friday April 20, 2018 3:24 PM CDT (20:24 UTC) Moonrise 9:19AMMoonset 11:31PM Illumination 29% Phase: Waxing Crescent; Moon at 5 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- 1011 Am Cdt Fri Apr 20 2018
Rest of today..Northeast winds 10 to 15 knots. Waves 1 to 2 feet. Dominant period 4 seconds.
Tonight..East winds 10 to 15 knots. Waves 1 to 2 feet. Dominant period 4 seconds.
Saturday..East winds 15 to 20 knots. Waves 2 to 4 feet. Dominant period 4 seconds. Slight chance of showers in the afternoon.
Saturday night..Southeast winds 10 to 15 knots. Waves 2 to 4 feet. Dominant period 4 seconds. Chance of showers through the night. Slight chance of Thunderstorms after midnight.
Sunday..Southwest winds 10 to 15 knots. Waves 1 to 3 feet. Dominant period 4 seconds. Showers likely and chance of Thunderstorms.
Sunday night..Northwest winds 10 to 15 knots. Waves 1 to 2 feet. Dominant period 4 seconds. Slight chance of showers in the evening.
Monday..Northwest winds 10 to 15 knots. Waves 2 to 4 feet. Dominant period 4 seconds.
Monday night..Northwest winds 10 to 15 knots. Waves 2 to 4 feet.
Tuesday..Northwest winds 10 to 15 knots. Waves 2 to 4 feet.
Tuesday night..Northwest winds 10 to 15 knots. Waves 1 to 2 feet.
GMZ500 Synopsis Pascagoula To Sw Pass Mississippi- Synopsis Sw Pass Mississippi River To Atchafalaya River- 1011 Am Cdt Fri Apr 20 2018
Synopsis..High pressure will remain over the area through tonight. A low pressure system will then affect the waters over the weekend. High pressure is expected to build back in by 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 200947
afdlix
area forecast discussion
national weather service new orleans la
447 am cdt Fri apr 20 2018

Short term
Temperatures are on the cool side for late april early this
morning with readings ranging from the upper 40s in many northern
locations to mostly 50s south, except for some lower 60s on the
immediate southeast louisiana coast. A large dome of surface high
pressure associated with a continental polar airmass was centered
over the mississippi valley and eastern plains region. This has
brought yet another round of unseasonably cold temperatures to
many northern and central states. In the mid to upper levels, a
closed low over the southwest u.S. Will move east into the
southern rockies late today and tonight while an atlantic coast
trough also moves east into the western atlantic. This will push a
mid upper level ridge axis across the mississippi valley late
today and tonight. Even with this warming pattern aloft, the cool
and dry airmass will continue to be felt across the forecast area
today and tonight as the surface high pressure dome slides slowly
east.

The upper low and strong shortwave trough will push east into the
southern plains Saturday and early Saturday night with a weak
surface low pressure area expected to develop from central texas
into the ark-la-tex region. A warm frontal boundary will push
north and should cross the western to central gulf coast region by
late Saturday. Moisture return and warm air advection could cause
a few showers to develop Saturday afternoon, however higher rain
chances are expected to spread from northwest to southeast late
Saturday night into Sunday as the upper low, shortwave trough and
surface low all move across the lower mississippi valley. There
will be a combination of ample dynamics lift, instability and
shear to bring a chance of thunderstorms across the region,
however the threat of severe thunderstorms looks to be marginal at
best at this point. This is reflected in the day 3 Sunday
convective outlook from spc. Rainfall amounts are not expected to
be that high with this system across the forecast area with the
heavier amounts expected to remain to the north of the area.

Expect average amounts ranging from around one inch near the
mississippi louisiana border to 1 3 to 1 2 inch on the southeast
louisiana coast. The cold front is expected to move through the
forecast area Sunday afternoon and evening, so rain chances should
diminish as the front moves through with only a few lingering
showers expected (mainly in northern and eastern areas) Sunday
evening. Lingering cyclonic flow and cold air advection will
likely lead to at least partly cloudy skies on Monday, however am
expecting any lingering showers to remain isolated over mainly far
northern and eastern locations.

Long term
As the weekend storm system moves across the east coast early next
week, a reinforcing series of shortwave troughs in the larger
longwave trough over the eastern u.S. Are expected to move
southeast from the northern plains and upper mississippi valley
across the mid to lower mississippi valley and southeast states
Wednesday through Thursday. This should maintain generally dry
conditions with temperatures averaging slightly below the
seasonal averages, however the ECMWF produces some light
precipitation amounts on Thursday, so have carried a slight chance
of showers over much of the forecast area. The end of next week
and start of the weekend look to dry at this point with near
normal temperatures. 22 td

Aviation
Vfr conditions will prevail at all of the terminals through the
entire forecast period. Gusty north winds of 15 to 20 knots should
persist through mid-morning before dissipating at knew. 32

Marine
A decreasing pressure gradient across the coastal waters will result
in winds falling below advisory levels early this morning. The wind
field should turn more easterly tonight at around 10 to 15 knots as
high pressure settles into the southeastern states. This brief
respite in stronger winds will come to an end by tomorrow as a low
pressure system strengthens over the southern plains. Increased
gradient flow from the southeast and south will result in a return
to exercise caution and possibly advisory level conditions over much
of the open gulf waters and sounds. These conditions should persist
through Sunday morning. The low pressure system and a cold front
will sweep through Sunday afternoon, and winds are expected to shift
to the northwest for Sunday evening and night. Weak cold and dry
air advection behind the front should keep winds elevated at 15 to
20 knots through at least Tuesday morning. A slight decrease in the
pressure gradient and wind field by Wednesday should allow winds to
fall to 10 to 15 knots and seas to drop below 4 feet. However, a
reinforcing front moving through Wednesday night should result in
higher winds of 15 to 20 knots and more exercise caution headlines.

32

Decision support
Dss code: blue.

Deployed: none.

Activation: none.

Activities: assessing thunderstorm risk for Sunday
sandhill crane nwr outreach support
new orleans navy week support
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; marginal risk severe or excessive rain.

Yellow = heightened impacts with short-fused watch, warning or
advisory issuances; radar support for slight risk severe or
excessive rain.

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

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

Preliminary point temps pops
Mcb 70 50 74 62 0 0 20 60
btr 71 52 76 64 0 0 20 70
asd 71 52 75 64 0 0 20 40
msy 70 58 76 66 0 0 20 40
gpt 70 56 74 66 0 0 10 40
pql 71 52 75 63 0 0 10 40

Lix watches warnings advisories
La... None.

Gm... Small craft advisory until 6 am cdt early this morning for
gmz530-532-534-536-538-550-552-555-557-570-572-575-577.

Ms... None.

Gm... Small craft advisory until 6 am cdt early this morning 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
NWCL1 - 8761927 - New Canal, LA 21 mi54 min N 5.1 G 6 62°F 67°F1023.5 hPa
FREL1 24 mi54 min E 1.9 G 2.9 61°F 1022.8 hPa
CARL1 28 mi54 min 58°F
SHBL1 - 8761305 - Shell Beach, LA 39 mi54 min NE 7 G 9.9 61°F 71°F1023.5 hPa
WYCM6 - 8747437 - Bay Waveland Yacht Club, MS 40 mi54 min SSE 7 G 8.9 60°F 66°F1023.4 hPa
BYGL1 - 8762482 - Bayou Gauche, LA 41 mi54 min NE 1.9 G 6 67°F 71°F1023.5 hPa

Wind History for New Canal Station, LA
(wind in knots)    EDIT      (on/off)   Help
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N7
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Slidell, Slidell Airport, LA14 mi31 minN 010.00 miFair68°F39°F36%1022.9 hPa
New Orleans, New Orleans Lakefront Airport, LA20 mi31 minNW 510.00 miFair66°F45°F47%1022.8 hPa
Hammond, Hammond Municipal Airport, LA22 mi29 minNE 510.00 miFair68°F42°F40%1023.7 hPa

Wind History from ASD (wind in knots)
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Last 24hrN11
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N6N7N7N5N5N6N10N6N4N6N4NE5N6NE9NE9NE8CalmCalmCalmE6Calm
1 day agoSW8
G16
SW8S6SW4CalmCalmS4SW4SW3CalmCalmCalmCalmCalmCalmNW4N8N7N10N8N7
G15
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2 days agoS15S12
G17
S10S7S4S6S6S6S5S4S8S8S7S6CalmCalmS8SW9
G15
SW764SW8SW7SW7

Tide / Current Tables for Tchefuncta River, Lake Pontchartrain, Louisiana
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Tchefuncta River
Click for Map
Fri -- 06:27 AM CDT     Sunrise
Fri -- 10:19 AM CDT     Moonrise
Fri -- 10:40 AM CDT     -0.08 feet Low Tide
Fri -- 07:31 PM CDT     Sunset
Fri -- 11:22 PM CDT     0.74 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.70.60.60.50.40.30.20.10-0-0.1-0.1-0.1-00.10.10.20.30.40.50.60.70.70.7

Tide / Current Tables for Bayou BonFouca, Route 433, Louisiana
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Bayou BonFouca
Click for Map
Fri -- 06:26 AM CDT     Sunrise
Fri -- 09:50 AM CDT     -0.07 feet Low Tide
Fri -- 10:18 AM CDT     Moonrise
Fri -- 07:29 PM CDT     Sunset
Fri -- 10:58 PM CDT     0.66 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.60.50.50.40.30.20.10-0-0.1-0.1-0.1-000.10.20.20.30.40.50.60.60.60.7

Weather Map and Satellite Images
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wmap_A
GOES Local Image of    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
target = "new">Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for New Orleans/Baton Rouge, LA (16,3,4,5)
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Ground Weather Radar Station New Orleans/Baton Rouge, LA
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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.