Monday, January21, 2019 L-36.com


Marine Weather and Tides
Slidell, LA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:53AMSunset 5:27PM Monday January 21, 2019 11:33 AM CST (17:33 UTC) Moonrise 7:14PMMoonset 8:18AM Illumination 99% Phase: Full Moon; Moon at 16 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 Lake Borgne- 901 Am Cst Mon Jan 21 2019
Rest of today..East winds 10 to 15 knots. Waves 1 to 3 feet. Dominant period 4 seconds.
Tonight..Southeast winds 10 to 15 knots. Waves 2 to 4 feet. Dominant period 4 seconds.
Tuesday..Southeast winds 10 to 15 knots. Waves 2 to 4 feet. Dominant period 4 seconds.
Tuesday night..South winds 10 to 15 knots. Waves 1 to 2 feet. Dominant period 4 seconds. Chance of showers.
Wednesday..Southwest winds 10 to 15 knots becoming northwest 15 to 20 knots in the afternoon. Waves 1 to 2 feet. Dominant period 4 seconds. Showers likely in the morning, then showers in the afternoon.
Wednesday night..Northwest winds 15 to 20 knots. Waves 1 to 3 feet. Dominant period 4 seconds. Chance of showers.
Thursday..Northwest winds 10 to 15 knots. Waves 1 foot or less. Dominant period 4 seconds.
Thursday night..Northwest winds 10 to 15 knots. Waves 1 to 2 feet. Dominant period 4 seconds.
Friday..North winds 10 to 15 knots. Waves 1 to 3 feet. Dominant period 4 seconds.
Friday night..Northeast winds 10 to 15 knots. Waves 1 to 2 feet. Dominant period 4 seconds.
GMZ500 Synopsis Pascagoula To Sw Pass Mississippi- Synopsis Sw Pass Mississippi River To Atchafalaya River- 901 Am Cst Mon Jan 21 2019
Synopsis..High pressure will settle for a short time before another cold front affects the area Wednesday. Yet another cold front is expected to move through early Friday.


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 210931
afdlix
area forecast discussion
national weather service new orleans la
331 am cst Mon jan 21 2019

Short term Another day of below average temperatures and clear
skies is expected today as a thermal trough and surface high
continue to influence the region. In the upper levels, the
northwest flow pattern will turn more zonal through the day.

Temperatures should be around 5 degrees below normal today with
highs climbing into the middle to upper 50s. Skies will remain
clear and humidity values will remain low.

The low to mid-level ridge axis will continue to push to the east
tonight and tomorrow, and this will open the door for gulf
moisture to surge back into the region. A fairly large region of
subsidence will remain in place in the upper levels tonight, and
have dry conditions persisting. However, an elevated inversion
should promote the development of a stratus deck tonight. The
surge in low level moisture and dewpoints will also push overnight
lows back to more normal readings in the 40s. Tomorrow will see
the flow aloft turn more southwesterly, and a gradual increase
positive vorticity advection through the day should promote the
development of a few showers by the afternoon hours. Temperatures
will also continue to warm on the back of this deep layer onshore
flow with highs climbing into the upper 60s and lower 70s.

A vigorous positively tilted shortwave trough will begin to take
on a neutral tilt as it moves through the forecast area Tuesday
night through Wednesday night. High omega values combined with
ample moisture will allow for a band of showers to form in advance
of a cold front and then sweep across the entire forecast area
during the day on Wednesday. At this time, it looks like
instability values over most of the area will remain on the weaker
side, and do not expect to see much in the way of thunderstorms
over land. In the offshore waters, there could be a few
thunderstorms that develop as some weak instability is expected
Wednesday afternoon. Have categorical pop of 80% or greater in the
forecast for Wednesday, and expect to see continued warm
temperatures in the upper 60s over the eastern two thirds of the
cwa in advance of the cold front. The western third of the cwa
should see the front move through earlier in the day, and highs
will be significantly cooler in the lower to middle 50s. Rain
chances should quickly come to an end from west to east Wednesday
night as the cold front and associated trough axis move into
florida. Strong dry air and negative vorticity advection behind
this system will bring clearing skies, lower humidity values, and
cooler temperatures by late Wednesday night.

Long term Deep layer northwest flow will take hold on Thursday
and remain in place on Friday. A reinforcing front should push
through the area Thursday night into early Friday, but this front
will be moisture starved as it moves through. At most, a few
passing clouds are expected as the boundary pushes across the
forecast area. Cold air advection will keep temperatures well
below normal with highs in the lower to middle 50s both Thursday
and Friday. Lows will cool into the 30s for most locations both
Wednesday and Thursday nights. In the wake of the reinforcing
front on Friday, temperatures should plunge into the middle to
upper 20s for most areas Friday night. Only areas south of lake
pontchartrain should remain at or slightly above freezing with
lows in the lower to middle 30s.

Both the GFS and the ECMWF indicate that another vorticity max
will slide down from the northern plains and pass through the gulf
south over the coming weekend. Both model solutions indicate the
potential of a gulf low forming off the louisiana coast and then
pushing eastward toward the florida panhandle Saturday into
Sunday. The region will remain on the northern and colder side of
the system through the weekend, and currently think temperatures
will remain just warm enough to keep any precipitation in all
liquid form. Have put a high end chance of rain in the forecast
beginning Saturday afternoon and ending by Sunday morning.

Saturday night has the highest rain chances, and temperatures
should cool into the upper 30s and lower 40s during this period.

Daytime highs should be well above freezing in the lower to middle
50s both Saturday and Sunday. At this time, it does not appear
that wintry precipitation will affect the area, but this is highly
dependent on how much cold air advection accompanies the system.

By Sunday afternoon and night, strong negative vorticity advection
and subsidence in the wake of the departing low will produce
rapidly clearing skies and cooler temperatures in the lower to
middle 30s.

Aviation Vfr through the early evening hours. Ceilings will begin to develop
after sunset and should move from sct020 to bkn025. Decks become
well established by Tuesday morning at ovc035. Some tempo decks at
bkn015 may develop Tuesday morning as well.

Marine A very progressive pattern is setting up for the next several days.

The next front will begin to bring return flow back to the area
today. This front may move through the northern gulf during the day
Wednesday with strong northerly winds around 25kt with gusts
possibly into the lower 30s. Wind speeds will only back off a little
before the northerly winds are reinforced by another cold front
moving through Friday. Southerly winds will be back by late Saturday
ahead of the next front moving through Saturday night into Sunday of
next weekend with another set of strong winds.

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; 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
excessive rain; direct tropical threats; events of national
significance.

Preliminary point temps pops
Mcb 55 42 66 50 0 0 20 50
btr 56 47 70 49 0 0 30 50
asd 55 42 69 57 0 0 10 50
msy 56 50 71 58 0 0 10 40
gpt 53 44 66 58 0 0 20 70
pql 55 40 67 58 0 0 20 70

Lix watches warnings advisories
La... None.

Gm... None.

Ms... None.

Gm... None.

32


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NWCL1 - 8761927 - New Canal, LA 24 mi40 min E 6 G 12 47°F 51°F1029.6 hPa
WYCM6 - 8747437 - Bay Waveland Yacht Club, MS 25 mi40 min N 1 G 2.9 42°F 48°F1030.6 hPa
SHBL1 - 8761305 - Shell Beach, LA 28 mi40 min ENE 12 G 15 47°F 53°F1030.1 hPa
CARL1 30 mi40 min 46°F
FREL1 35 mi40 min E 9.9 G 12 44°F 1029 hPa
BYGL1 - 8762482 - Bayou Gauche, LA 47 mi40 min E 4.1 G 9.9 51°F 52°F1029.8 hPa

Wind History for New Canal Station, LA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Slidell, Slidell Airport, LA6 mi41 minVar 510.00 miFair46°F23°F40%1030.3 hPa
Bay St. Louis, Stennis International Airport, MS19 mi44 minVar 410.00 miClear46°F26°F46%1031.2 hPa
New Orleans, New Orleans Lakefront Airport, LA20 mi41 minE 1210.00 miFair48°F35°F61%1029.5 hPa

Wind History from ASD (wind in knots)
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Last 24hrN7
G20
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NW8NW5CalmCalmN5CalmCalmCalmCalmN4N4NE3CalmCalmN3CalmCalmE635
1 day ago3SW7SW11
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6N9N17
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2 days agoSW4S4SW4S6SE5SE6SE5SE9S4S6S10SE9S11S6S8S8S8S8S8S10
G18
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G23
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G23
W12
G24

Tide / Current Tables for Bayou BonFouca, Route 433, Louisiana
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Pearlington, Pearl River, Mississippi
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Weather Map and Satellite Images
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wmap_A
GOES Local Image of Southeast    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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
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.