Friday, July21, 2017 L-36.com


Marine Weather and Tides
Slidell, 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 6:09AMSunset 8:01PM Thursday July 20, 2017 11:41 PM CDT (04:41 UTC) Moonrise 3:22AMMoonset 5:23PM Illumination 7% Phase: Waning Crescent; Moon at 27 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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GMZ534 Mississippi Sound-lake Borgne- 1019 Pm Cdt Thu Jul 20 2017
Rest of tonight..West winds 5 to 10 knots. Waves 1 to 2 feet. Dominant period 4 seconds. Chance of showers and Thunderstorms through the night.
Friday..Northwest winds 5 to 10 knots becoming north late in the morning, then becoming south in the afternoon. Waves 1 to 2 feet. Dominant period 4 seconds. Chance of showers and Thunderstorms.
Friday night..Southwest winds 5 to 10 knots. Waves 1 to 2 feet. Dominant period 4 seconds. Slight chance of showers and Thunderstorms.
Saturday..South winds 10 to 15 knots. Waves less than 1 foot. Dominant period 4 seconds. Waves or seas building to 1 to 2 feet. Dominant period 4 seconds in the afternoon. Chance of showers and Thunderstorms.
Saturday night..Southwest winds 10 to 15 knots. Waves 1 to 2 feet. Dominant period 4 seconds. Chance of showers and Thunderstorms.
Sunday..Southwest winds 10 to 15 knots. Waves 1 to 2 feet. Dominant period 4 seconds. Chance of showers and Thunderstorms.
Sunday night..West winds 10 to 15 knots. Waves 2 to 4 feet. Dominant period 4 seconds. Slight chance of showers and Thunderstorms.
Monday..Southwest winds 10 to 15 knots. Waves 1 to 2 feet. Slight chance of showers and Thunderstorms.
Monday night..West winds 10 to 15 knots. Waves 2 to 4 feet. Slight chance of showers and Thunderstorms after midnight.
Tuesday..West winds 10 to 15 knots. Waves 1 to 2 feet. Slight chance of showers and Thunderstorms.
Tuesday night..West winds 10 to 15 knots. Waves 1 to 2 feet. Slight chance of showers and Thunderstorms after midnight.
GMZ500 Synopsis Pascagoula To Sw Pass Mississippi- Synopsis Sw Pass Mississippi River To Atchafalaya River- 1019 Pm Cdt Thu Jul 20 2017
Synopsis..Surface high pressure will remain centered over the north central gulf into next week.

7 Day Forecast for Marine Location Near Slidell, LA
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location: 30.27, -89.79     debug


Area Discussion for - New Orleans/Baton Rouge, LA
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Fxus64 klix 210154
afdlix
area forecast discussion
national weather service new orleans la
854 pm cdt Thu jul 20 2017

Sounding discussion
There were not any problems with the upper air release this
evening. The 00z sounding indicated an unstable, but overall
drier sounding. In particular, drier air was prevalent in the mid
and upper levels. The precipitable water value was down to 1.62
inches. A couple of weak inversions were present in the mid
levels. Mainly northeast to east northeast winds were observed
throughout much of the profile. 11

Prev discussion issued 337 pm cdt Thu jul 20 2017
discussion...

latest surface analysis showed a broad 1020mb high over northwest
gulf of mexico to tennessee valley. Upper air analysis revealed a
large anti- cyclonic circulation over the central plains with
an axis extending southeast to the mid south and lower
mississippi valley. A short wave was noted over ohio valley. In
addition, a closed cyclonic circulation was noted along the
eastern seaboard. The increase thickness layer over has warmed the
layer and suppressed most of the convection across the louisiana
and mississippi today.

Precipitable water values on a planer view showed values of around
1.5 inches over mississippi, east half of louisiana, arkansas and
tennessee. This feature initialized well but GFS initialized 2
inches over north mississippi but NAM not showing this feature
until 18z today. Northerly flow on the front side of upper level
high and flow on the backside of the east coast low will advect
in mid layer moisture associated with the short wave over ohio
valley. Either way, deeper moisture will arrive from the northeast
around 18z on Friday. Weather remain relatively precip free til
Friday. With surface dewpoint in the upper 70s and surface heating
Friday morning, many locales will reach heat index values of 100
degrees between 10 and 11 am Friday morning and several points
reaching 106 degrees heat index by noon. Our office will be
monitored this heat event through Friday.

The closed upper level low is expected to push west over the
forecast area this weekend. Over the forecast area, 500mb temps of
-5c will decrease to -8c, 700 to 500mb lapse rates increasing to
6.5c km and pw values increasing back up to 2 inches Friday and
over the weekend. As result, rain chances will go from nil today
to scattered to numerous over the weekend, Friday will be the
transition day. Upper level low will continue to push west and
open next week and push north by mid layer drying from the gulf.

This will slight shift will decrease our rain chances to slightly
below normal for next week and dangerous heat index values will
return with brief relief. 18
aviation...

vfr conditions will prevail at all of the terminals through tomorrow
afternoon. Some scattered thunderstorm activity should develop from
late morning through the afternoon hours, and will include vcts
wording to reflect this risk. 32
marine...

a rather benign weather regime will persist over the coastal waters
through early next week as the region remains on the western
periphery of broad surface high. A weak nocturnal coastal jet
associated with the seabreeze landbreeze pattern is expected to
develop each night resulting in some westerly winds around 15 knots
each night. Seas will generally range between 1 and 2 feet through
the period, but areas beneath the nocturnal jet could see a brief
period of seas up to 3 feet. Overall, no significant impacts to
mariners are expected through the first half of next week. 32
decision support...

dss code: green.

Deployed: none.

Activation: none.

Activities: 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 76 93 74 88 10 40 40 50
btr 77 93 75 89 10 40 40 50
asd 77 92 76 90 20 40 40 50
msy 78 91 77 89 20 40 20 40
gpt 79 91 78 88 20 40 20 40
pql 77 91 77 88 20 40 20 40

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
OSTF1 - Stennis Test Facility 11 mi51 min Calm G 1.9 83°F 1017.7 hPa (+1.0)79°F
NWCL1 - 8761927 - New Canal, LA 24 mi41 min SW 5.1 G 7 85°F 91°F1017.2 hPa (+0.7)
WYCM6 - 8747437 - Bay Waveland Yacht Club, MS 25 mi41 min WSW 4.1 G 5.1 85°F 89°F1017.2 hPa (+1.0)
SHBL1 - 8761305 - Shell Beach, LA 28 mi41 min SW 6 G 8 85°F 91°F1017.4 hPa (+0.7)
CARL1 30 mi41 min 86°F
FREL1 35 mi41 min SW 4.1 G 6 82°F 1016.2 hPa (+0.6)74°F
BYGL1 - 8762482 - Bayou Gauche, LA 47 mi41 min W 1.9 G 2.9 80°F 90°F1017.5 hPa (+0.4)

Wind History for New Canal Station, LA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Slidell, Slidell Airport, LA6 mi48 minN 010.00 miFair85°F78°F80%1016.9 hPa
Bay St. Louis, Stennis International Airport, MS19 mi3.8 hrsSSW 47.00 miA Few Clouds84°F78°F84%1016.3 hPa
New Orleans, New Orleans Lakefront Airport, LA20 mi48 minSW 910.00 miFair86°F78°F77%1016.7 hPa

Wind History from ASD (wind in knots)
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Last 24hrCalmCalmCalmN3CalmCalmCalmN3CalmNW3NW4NE4--NE7NE6N6NW5NE6NE5CalmCalmCalmCalmCalm
1 day agoCalmN6CalmN3CalmCalmCalmN4CalmCalmCalmE4E4CalmN5Calm6S4S6S6N5CalmCalmCalm
2 days agoSE3SE7CalmCalmS3--N6NW3NW3NE3CalmCalmCalmS4W53S7S7S6SW3N3N5CalmN6

Tide / Current Tables for Bayou BonFouca, Route 433, Louisiana
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Bayou BonFouca
Click for Map
Fri -- 04:18 AM CDT     Moonrise
Fri -- 04:57 AM CDT     -0.17 feet Low Tide
Fri -- 06:11 AM CDT     Sunrise
Fri -- 06:26 PM CDT     Moonset
Fri -- 06:29 PM CDT     0.68 feet High Tide
Fri -- 07:59 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.20.1-0-0.1-0.2-0.2-0.2-0.1-000.10.20.30.40.50.50.60.60.70.70.60.60.50.4

Tide / Current Tables for Pearlington, Pearl River, Mississippi
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Pearlington
Click for Map
Fri -- 04:18 AM CDT     Moonrise
Fri -- 06:10 AM CDT     Sunrise
Fri -- 01:08 PM CDT     1.56 feet High Tide
Fri -- 06:25 PM CDT     Moonset
Fri -- 07:58 PM CDT     Sunset
Fri -- 11:45 PM CDT     -0.45 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.4-0.3-0.100.20.40.60.811.11.31.41.51.61.51.41.310.70.40.1-0.1-0.3-0.4

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 (0,6,7,8)
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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.