Saturday, December14, 2019
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Marine Weather and Tides
New Orleans, 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 6:46AMSunset 5:03PM Saturday December 14, 2019 9:05 PM CST (03:05 UTC) Moonrise 7:38PMMoonset 9:02AM Illumination 88% Phase: Waning Gibbous; Moon at 18 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- 405 Pm Cst Sat Dec 14 2019
.dense fog advisory in effect from 11 pm this evening to 9 am cst Sunday...
Tonight..Southeast winds 5 to 10 knots. Waves 1 foot or less. Dominant period 4 seconds. Areas of dense fog after midnight.
Sunday..South winds 10 to 15 knots. Waves 1 to 2 feet. Dominant period 4 seconds. Widespread dense fog early in the morning.
Sunday night..South winds 5 to 10 knots. Waves 1 to 2 feet. Dominant period 4 seconds.
Monday..South winds 10 to 15 knots. Waves 1 to 2 feet. Dominant period 4 seconds. Chance of showers in the morning, then showers and slight chance of Thunderstorms in the afternoon.
Monday night..Southwest winds 5 to 10 knots becoming northwest 15 to 20 knots after midnight. Waves 1 to 2 feet building to 3 to 4 feet with occasional waves to 5 feet. Dominant period 4 seconds. Showers and Thunderstorms in the evening, then slight chance of Thunderstorms after midnight. Showers likely after midnight.
Tuesday..North winds 20 to 25 knots. Waves 3 to 5 feet. Dominant period 4 seconds. Slight chance of showers in the morning.
Tuesday night..North winds 20 to 25 knots. Waves 3 to 5 feet. Dominant period 4 seconds.
Wednesday..North winds 15 to 20 knots. Waves 3 to 5 feet. Dominant period 4 seconds.
Wednesday night..Northeast winds 10 to 15 knots. Waves 1 to 2 feet. Dominant period 4 seconds.
Thursday..East winds 5 to 10 knots. Waves 1 to 2 feet. Dominant period 4 seconds.
Thursday night..East winds 5 to 10 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- 405 Pm Cst Sat Dec 14 2019
Synopsis..High pressure over the southeast u.s. Will continue to move east through Sunday while low pressure and a strong cold front move east to southeast across the southern plains. This strong cold front will sweep through the central gulf coast coastal waters Monday night. High pressure will build in behind this front on Tuesday and move over the gulf coast region late Wednesday into Thursday.


7 Day Forecast for Marine Location Near New Orleans, LA
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location: 30.07, -90.06     debug


Area Discussion for - New Orleans/Baton Rouge, LA
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FXUS64 KLIX 142335 CCA AFDLIX

Area Forecast Discussion National Weather Service New Orleans LA 456 PM CST Sat Dec 14 2019

SHORT TERM (Tonight through Tuesday).

Surface high pressure that has been centered over the forecast area will continue to move east across the southeast U.S. tonight and Sunday as low pressure and a strong cold front advances east and southeast across the Red River valley and Texas. The mostly clear skies over most land areas going into this evening and near calm to light southeast winds should set the stage for strong radiational cooling and near surface saturation to produce patchy fog by midnight. Conditions then remain fairly favorable for additional fog formation after midnight and blended guidance suggest visibilities will lower to near one quarter mile over areas generally east of I-55 and south of Lake Pontchartrain to coastal areas where a Dense Fog Advisory has been issued. Stronger southerly winds by mid morning are expected to mix out the fog and most low level clouds faster than today. This will lead to a partly sunny and rather warm and dry day with highs reaching the mid to upper 70s, except for lower 70s near the coast.

Rain chances will return from the northwest last Sunday night as a broad and potent, positively tilted shortwave trough moves east out of the southern Rockies into the Plains with the associated cold front advancing southeast into the ArkLaTex region. The strong cold front will continue to advance southeast towards the northwest portion of the forecast area last Monday and through the forecast area Monday night as the shortwave trough advances east through the Plains and mid Mississippi valley. As mentioned in previous discussions and SPC, the speed shear will be rather impressive with moderate instability also expected in the afternoon. The limiting factor for organized severe thunderstorms will be the limited forcing with the elongated shortwave trough and surface low pressure system passing well north of the deep South. However, the current marginal risk near the coast and slight risk over the more inland areas appears on track given the pattern. Greatest risk time locally will be Monday afternoon and evening with the main threat being strong, possibly damaging wind gusts, a few tornadoes and some hail. Have high rain chances since coverage should be fairly widespread during the frontal passage time, then rain chances will decrease fairly quickly late Monday night and Tuesday as the front moves offshore. This will usher in much colder air and brisk north winds for Monday night and Tuesday.

LONG TERM (Wednesday through Sunday).

The cold airmass will settle over the central Gulf coast region from Tuesday night through Thursday, and clear skies should allow for a light freeze over the northern/inland areas Tuesday night and Wednesday night.

Another potent shortwave trough with a closed low is forecast by both the operational 12z GFS and ECMWF to move east then southeast across the southern Plains then central to eastern Gulf coast region during the Thursday night to Saturday night period. This system is only expected to bring isolated to scattered showers and patchy rain at this time since moisture recovery will be rather limited in the wake of the strong frontal passage Monday night.

AVIATION.

It took some time, but a scattering out to clearing of the clouds occurred today in most land areas with KGPT close to being on the western edge of an MVFR category cloud line. The clearing and light southeast wind flow will likely set the stage for additional low stratus and areas of fog to develop overnight into early Sunday morning. Have MVFR to IFR category conditions starting in the 05-09z period with LIFR and lower conditions expected in the 08-14z period at most TAF airports. Faster improvement back to MVFR and VFR is expected Sunday morning due to better mixing with stronger southerly winds that are expected.

MARINE.

Pressure gradient will increase over the marine area as high pressure moves east and low pressure and a strong cold front advances east to southeast across the southern Plains. This will cause an increase in southerly winds to moderate levels (near 15 knots at times) overnight tonight through Monday evening. Lighter winds near the tidal lakes and some coastal areas should allow another round of lake fog which will likely lower visibility to less than one mile. Issued Marine Dense Fog Advisory from 11 am tonight through 9 am Sunday across the tidal lakes, and that may need to be expanded to some other sounds and nearshore waters later this evening.

The strong cold front will sweep through the coastal waters late Monday night. Strong high pressure with much colder air will build in behind this front on Tuesday and remain in place through Wednesday. This post- frontal period will need Small Craft Advisory headlines for strong offshore winds and rough seas.

DECISION SUPPORT.

DSS code: Blue. Deployed: None. Activation: None. Activities: Dense Fog Advisory Forecast Support for the City of New Orleans. 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 49 74 61 75 / 10 10 20 90 BTR 52 78 63 77 / 0 10 30 90 ASD 50 76 60 78 / 0 10 10 80 MSY 56 75 64 78 / 0 10 10 80 GPT 52 71 61 73 / 0 10 10 60 PQL 50 75 60 77 / 10 10 10 60

LIX WATCHES/WARNINGS/ADVISORIES. LA . Dense Fog Advisory from midnight tonight to 9 AM CST Sunday for LAZ039-040-058>072.

GM . Dense Fog Advisory from 11 PM this evening to 9 AM CST Sunday for GMZ530-534.

MS . Dense Fog Advisory from midnight tonight to 9 AM CST Sunday for MSZ070-071-077-080>082.

GM . Dense Fog Advisory from 11 PM this evening to 9 AM CST Sunday for GMZ534.



22/TD


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NWCL1 - 8761927 - New Canal, LA 4 mi54 min SE 1.9 G 6 56°F 59°F1012.5 hPa
CARL1 10 mi48 min 49°F
FREL1 19 mi48 min SE 5.1 G 5.1 56°F 1012.2 hPa
SHBL1 - 8761305 - Shell Beach, LA 25 mi54 min ESE 7 G 9.9 55°F 60°F1013.7 hPa
BYGL1 - 8762482 - Bayou Gauche, LA 27 mi54 min ESE 8 G 9.9 55°F 59°F1013.4 hPa
WYCM6 - 8747437 - Bay Waveland Yacht Club, MS 43 mi54 min SE 4.1 G 5.1 53°F 56°F1014.2 hPa

Wind History for New Canal Station, LA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
New Orleans, New Orleans Lakefront Airport, LA3 mi73 minSE 60.25 miFog56°F54°F93%1012.8 hPa
New Orleans, New Orleans International Airport, LA12 mi73 minSE 50.50 miFog58°F55°F93%1013.2 hPa
New Orleans Naval Air Station - Alvin Callender Field, LA17 mi71 minESE 50.25 miFog54°F54°F100%1013.2 hPa
Slidell, Slidell Airport, LA23 mi73 minN 00.50 miFog54°F53°F97%1013.6 hPa

Link to 5 minute data for KNEW

Wind History from NEW (wind in knots)
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Last 24hrNW4NW3CalmCalmSE4SE4E3SE3S4SE5S6S6CalmN4NE3NE6N8NE7NE5E6E7SE7SE6SE7
1 day agoNE11NE12NE10N10NE8E10E8E6NE7NE6NE6NE6N5N5CalmNW6N8N6N3NE4NW4CalmCalmCalm
2 days agoNE21NE20E17E18NE17NE17NE17E17NE16NE15NE13NE12E10E10NE9NE8NE8N10N10N12N11N11NE12NE11

Tide / Current Tables for New Canal USCG station, Lake Pontchartrain, 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 Paris Road Bridge, Mississippi River Delta, Louisiana
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Paris Road Bridge
Click for Map
Sat -- 03:25 AM CST     1.27 feet High Tide
Sat -- 06:47 AM CST     Sunrise
Sat -- 09:01 AM CST     Moonset
Sat -- 03:39 PM CST     -0.51 feet Low Tide
Sat -- 05:01 PM CST     Sunset
Sat -- 07:36 PM CST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.91.11.21.31.31.21.10.90.70.50.20-0.2-0.3-0.4-0.5-0.5-0.5-0.3-0.2-00.20.40.6

Weather Map
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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 (22,6,7,8)
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Ground Weather Radar Station New Orleans/Baton Rouge, LA
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Gulf Stream Current


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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.