Tuesday, December10, 2019
Privacy Policy
L-36.com


Marine Weather and Tides
Slidell, LA

Version 3.4
NOTICE
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:43AMSunset 5:00PM Tuesday December 10, 2019 1:16 AM CST (07:16 UTC) Moonrise 5:05PMMoonset 6:03AM Illumination 97% Phase: Waxing Gibbous; Moon at 13 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
    EDIT      (on/off)   Help
GMZ534 Lake Borgne- 942 Pm Cst Mon Dec 9 2019
.dense fog advisory in effect until 7 am cst Tuesday...
.small craft advisory in effect from Tuesday evening through late Wednesday night...
Rest of tonight..South winds 5 to 10 knots. Waves 1 to 2 feet. Dominant period 4 seconds. Patchy fog through the night. Slight chance of showers after midnight.
Tuesday..South winds 5 to 10 knots becoming north 10 to 15 knots late in the afternoon. Waves 1 to 2 feet. Dominant period 4 seconds. Patchy fog early in the morning. Chance of showers in the morning. Showers in the afternoon.
Tuesday night..Northeast winds 20 to 25 knots. Waves 3 to 5 feet. Dominant period 4 seconds. Showers.
Wednesday..Northeast winds 20 to 25 knots. Waves 3 to 5 feet. Dominant period 4 seconds. Showers likely in the morning, then chance of showers in the afternoon.
Wednesday night..Northeast winds 20 to 25 knots. Waves 3 to 5 feet. Dominant period 4 seconds. Slight chance of showers early in the evening.
Thursday..Northeast winds 15 to 20 knots. Waves 2 to 4 feet. Dominant period 4 seconds. Slight chance of showers in the afternoon.
Thursday night..Northeast winds 15 to 20 knots. Waves 2 to 4 feet. Dominant period 4 seconds. Chance of showers.
Friday..Northeast winds 10 to 15 knots. Waves 2 to 4 feet. Chance of showers.
Friday night..Northwest winds 5 to 10 knots. Waves 1 foot or less.
Saturday..West winds near 10 knots. Waves 1 foot or less.
Saturday night..Southwest winds 5 to 10 knots becoming east after midnight. Waves 1 foot or less.
GMZ500 Synopsis Pascagoula To Sw Pass Mississippi- Synopsis Sw Pass Mississippi River To Atchafalaya River- 942 Pm Cst Mon Dec 9 2019
Synopsis.. A cold front will sweep through the coastal waters Tuesday night. A low pressure system will then develop over the central gulf of mexico Wednesday night into Thursday. This low pressure system will pass over the eastern gulf waters Thursday night into Friday. High pressure will then build in on Saturday.


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


Area Discussion for - New Orleans/Baton Rouge, LA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
FXUS64 KLIX 100539 AFDLIX

Area Forecast Discussion National Weather Service New Orleans LA 1139 PM CST Mon Dec 9 2019

. UPDATED AVIATION DISCUSSION .

EVENING UPDATE. /issued 1006 PM CST Mon Dec 9 2019/

Performed an update to the gridded forecast package this evening to closely reflect recent observations. Only real focus in the short-range is dense coastal and near coastal advection fog issues. SREF guidance hinted at this issue days ago, only question this evening was the areal extent to the west. So for this package, going to keep the south MS counties and coastal Plaquemines and St. Bernard Parishes in an advisory until 7AM. Only location in question will be near coastal St. Tammany parish, as some developing dense fog out across Lake Pontchartrain tries to bleed inland due to southerly winds (although winds too strong may prevent much, if any surface fog). Otherwise, we will keep a close eye on observations through tonight and early tomorrow.

Still looking like a wet day tomorrow and tomorrow night, especially for western areas. Went with blended guidance for PoP's with a slightly higher bias Tuesday evening through Tuesday night. A cold front will swing across early tomorrow through early tomorrow afternoon, dropping temperatures quickly through early Wednesday morning. No real changes on the timing and temperatures were necessary, but it is very possible that there will be much more of a sharper gradient in temperatures along the front. Winds pick up across marine areas once the front passes early Tuesday night and will last for quite a while, especially for outer Gulf zones through atleast late week - and have placed Small Craft Advisories timed for the higher winds per latest guidance trends. KLG

PREV DISCUSSION. /issued 401 PM CST Mon Dec 9 2019/

SHORT TERM.

A broad positively tilted trough axis and associated frontal boundary will continue to approach the area tonight into tomorrow. Increasing positive vorticity advection will result in higher omega values and lift tonight. A northwest to southeast gradient in this lift will be present through the night, and have the highest POP values across the northwest portion of the forecast area. Rain chances should also increase through the night as the frontal boundary moves into the northwestern zones by daybreak tomorrow. In advance of the front, onshore flow and dewpoints near the water temperature along the Mississippi coast and northshore of Lake Pontchartrain may allow for some patchy fog develop late tonight and early tomorrow. Not expecting much in the way of dense fog due to the increasing omega overspreading the region and off and on isolated to scattered rain showers breaking up the fog. Temperatures will be warmer than average with lows in the upper 50s and lower to middle 60s.

The best chances for rain will take place tomorrow into tomorrow night as the front pushes through and a vigorous vorticity maxima embedded within the broader longwave trough axis aloft slides across the Gulf South. Weak mid-level cyclogenesis may even occur along the frontal boundary as it moves through late Tuesday night into early Wednesday morning. Have categorical POP values of 80 to 100 percent in the forecast across the northern zones during the day tomorrow. These values will push into the central and southern portions of the forecast area tomorrow night as the mid-level low develops. There will be a limited risk of some elevated thunderstorms developing tomorrow night into early Wednesday, but the highest thunderstorm chances should remain over the coastal waters. The low risk of thunderstorm development is due to the vast majority of the rain being post-frontal and isentropically induced. There will be limited CAPE above 850mb that could support thunderstorm activity, and have no mention over land based zones tomorrow through Wednesday morning.

Conditions should gradually improve Wednesday afternoon into Wednesday night as some drier air advects in from the west. Cold air advection will also continue and expect to see temperatures averaging 10 to 15 degrees colder than normal Wednesday into Wednesday night. It should also be quite breezy for areas south of the tidal lakes due to this continued cold air advection into the region. Full expect to see winds of 15 to 20 mph with higher gusts from Tuesday night through Wednesday night.

LONG TERM.

The frontal boundary will stall over the coastal waters and northern Gulf Wednesday night and remain in place into Thursday. Weak upper level ridging Thursday morning will quickly give way to a vigorous vorticity maxima ejecting out of Texas. A surface low will begin to form along the stalled boundary in a region of enhanced baroclincity across the northwest Gulf by Thursday afternoon. Warm frontal processes will overtake the area in advance this deepening low pressure system Thursday afternoon into Thursday night. The warm front should push close to the coast Thursday night, and this will place the coastal waters in the warm sector. Areas north of the front should remain cooler and much more stable. Expect to see scattered showers across most of the land based zones, but scattered to numerous showers and thunderstorms will be possible across the coastal waters. Lower Plaquemines Parish will have the highest risk of thunderstorm activity Thursday night. Temperatures will have a quite a spread with lows in the lower to middle 40s north of the warm front and the upper 50s and lower to middle 60s south of the front.

A northern stream longwave trough axis and cold front merging with the southern stream low and vorticity maxima will sweep across the area on Friday. Increased dry air advection and upper level subsidence in the wake of this trough will lead to decreasing rain chances and clearing skies throughout the afternoon and evening hours on Friday. Cold air advection will be somewhat limited with this trough axis as the airmass advecting in will be more Pacific based in nature. As a result, a return to more normal temperatures is expected for Saturday and Sunday. The deep pool of drier air in place will also result in mostly clear skies and dry weather on both Saturday and Sunday.

AVIATION.

UPDATED 0539Z.

Main impacts that continue across several area terminals (generally east of I-55) will be ongoing dense fog and low CIG's. Expect foggy conditions to persist at times (perhaps jumping around from 1/4 mile to 2-3sm VIS) through the early morning hours which will lead to lower flight categories (IFR/LIFR). For other areas, there may be some patchy surface fog or lower CIG's through around daybreak but there is lower confidence about how far west the fog will expand or develop. For now, the worst fog will remain near coastal locations, as higher dewpoint air travels over slightly cooler waters (northshore/coastal MS and coastal SE LA). Conditions will not improve much after daybreak, before an approaching cold front and associated showers sweep across the area. Timed the approximate passage of the front and wind shift using latest CAM guidance. Winds will remain breezy behind the front with stratiform post-frontal rain persisting leading to primarily MVFR conditions, but periods lower will be possible. KLG

MARINE.

The main concerns through the weekend will be a frontal boundary pushing through the waters tomorrow night and a low pressure system passing through the waters Thursday night. Strong offshore winds are expected to develop tomorrow night behind the front and remain in place through Wednesday night. Winds of 20 to 30 knots will result in small craft advisory flags being issued from Tuesday night through Thursday morning. Waves of 3 to 6 feet in the lakes and sounds and 6 to 10 feet in the open Gulf waters can also be expected during this period. The low pressure system should pass through the waters Thursday night into Friday morning. Winds will remain elevated to the north and west of the low where the pressure gradient is expected to be greatest, and expect to see continued small craft advisory conditions across the sounds and open Gulf waters through Friday morning. High pressure will settle in for Friday night and Saturday with west-northwest winds of around 10 knots forecast.

DECISION SUPPORT.

DSS code: Blue. Deployed: None. Activation: None. Activities: Dense Fog Advisories. Forecast Support for the City of New Orleans and Crane Fest 2019. 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 rainfall, or direct tropical threats; Events of National Significance.

PRELIMINARY POINT TEMPS/POPS. MCB 60 65 40 55 / 90 100 100 20 BTR 62 65 41 55 / 80 90 100 20 ASD 64 71 41 56 / 30 90 90 50 MSY 69 75 47 55 / 20 90 90 50 GPT 66 71 43 55 / 20 90 80 60 PQL 65 76 41 57 / 10 90 70 60

LIX WATCHES/WARNINGS/ADVISORIES. LA . Dense Fog Advisory until 7 AM CST Tuesday for LAZ069-070.

GM . Dense Fog Advisory until 7 AM CST Tuesday for GMZ530-532-534-536- 538-550-552-555-557.

Small Craft Advisory from midnight Tuesday night to 6 AM CST Friday for GMZ552-555-557-570-572-575-577.

Small Craft Advisory from 6 PM Tuesday to 6 AM CST Thursday for GMZ530-532-534-536-538-550.

MS . Dense Fog Advisory until 7 AM CST Tuesday for MSZ077-080>082.

GM . Dense Fog Advisory until 7 AM CST Tuesday for GMZ532-534-536-538- 550-552-555-557.

Small Craft Advisory from midnight Tuesday night to 6 AM CST Friday for GMZ555-557-570-572-575-577.

Small Craft Advisory from 6 PM Tuesday to 6 AM CST Thursday for GMZ532-534-536-538-550.




Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NWCL1 - 8761927 - New Canal, LA 24 mi47 min S 7 G 8.9 71°F 63°F1014.1 hPa
WYCM6 - 8747437 - Bay Waveland Yacht Club, MS 25 mi47 min SSW 4.1 G 7 67°F 62°F1015.3 hPa
SHBL1 - 8761305 - Shell Beach, LA 28 mi47 min S 7 G 8.9 68°F 65°F1015.4 hPa
CARL1 30 mi47 min 51°F
FREL1 35 mi47 min S 7 G 8.9 72°F 1013.5 hPa
BYGL1 - 8762482 - Bayou Gauche, LA 47 mi47 min SSE 4.1 G 5.1 70°F 65°F1014.9 hPa

Wind History for New Canal Station, LA
(wind in knots)    EDIT      (on/off)   Help
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
Last
24hr
S3
S3
S4
S4
S5
G9
S4
G10
S6
G10
S7
G11
S5
G10
S7
G11
SW7
G18
S10
G13
S9
G14
S14
G21
S10
G21
S10
G15
SW9
G14
S11
G14
S8
G11
S8
S7
S6
G9
S6
S6
G9
1 day
ago
--
N2
N2
N4
N2
N2
NE5
NE7
NE7
NE4
N4
N5
N6
NE5
NE5
NE4
E4
SE3
--
SE2
S3
S4
S4
S4
2 days
ago
N9
N10
N8
G11
N10
N9
N8
N10
NE8
NE8
N6
N8
N7
G10
N10
N11
NE13
NE12
NE9
G14
NE6
G9
NE7
NE5
G8

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Slidell, Slidell Airport, LA6 mi24 minSSW 53.00 miFog/Mist70°F68°F93%1014.6 hPa
Bay St. Louis, Stennis International Airport, MS19 mi4.4 hrsS 104.00 miFog/Mist70°F68°F94%1015.2 hPa
New Orleans, New Orleans Lakefront Airport, LA20 mi24 minS 116.00 miFog/Mist71°F68°F90%1014.3 hPa

Link to 5 minute data for KASD

Wind History from ASD (wind in knots)
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
Last 24hrCalmCalmCalmS3S3S8S9S9S9S10
G17
S7S9S11S8S8S7S4S6S5S5S5S4S5S5
1 day agoCalmCalmCalmNE3CalmCalmCalmN334SE53S6SW4W3CalmCalmCalmCalmCalmCalmCalmCalmCalm
2 days agoN11N10N9N7N5NE5NE7NE8NE8NE6N6N8N6N9N7N5NE5N6N6CalmCalmCalmCalmCalm

Tide / Current Tables for Bayou BonFouca, Route 433, Louisiana
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
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
   EDIT      (on/off)   Help   One Week of Data
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Weather Map
       (on/off)   Help Weather Map
wmap_A
GEOS 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 (2,6,7,8)
      (on/off)   Help

Ground Weather Radar Station New Orleans/Baton Rouge, LA
   (on/off)   Help
weather_mapweather_map weather_map

Gulf Stream Current


Ad by Google

Cookie Policy:
This webiste uses cookies to save your settings. No personal information is saved. You can disable cookies in your browser if you like but it is not recommended for this site. I do not sell cookies. Go to a bakery for that. In fact I do not sell anything. To disable cookies from L-36.com, please refer to the Help button in your browser.
Privacy Policy:
I do not sell or share any user data or anything else for that matter. I do not keep site logs longer than I need to to keep bad actors off the site. Basically, I delete them after looking at them. If you are subject to CCPA, Google ads on this site will not be based on your past behavior so you will likely not see an ad for a lawn mower just because you looked for one at a big box website. I do not believe this site is subject to CCPA but I am doing what I can to follow the guidelines anyway.
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.