Monday, March30, 2020
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Marine Weather and Tides
Madisonville, LA

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
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.

Sunrise 6:51AMSunset 7:21PM Monday March 30, 2020 7:36 AM CDT (12:36 UTC) Moonrise 9:48AMMoonset 12:00AM Illumination 39% Phase: Waxing Crescent; Moon at 6 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- 417 Am Cdt Mon Mar 30 2020
Today..East winds 5 to 10 knots. Waves 1 to 2 feet. Dominant period 4 seconds.
Tonight..Southeast winds near 10 knots becoming south after midnight. Waves 1 to 2 feet. Dominant period 4 seconds. Chance of showers after midnight. Slight chance of Thunderstorms after midnight.
Tuesday..West winds 15 to 20 knots. Waves 2 to 4 feet. Dominant period 4 seconds. Slight chance of Thunderstorms early in the morning. Chance of showers in the morning.
Tuesday night..North winds 15 to 20 knots. Waves 2 to 4 feet. Dominant period 4 seconds.
Wednesday..North winds 10 to 15 knots easing to near 5 knots late in the afternoon. Waves 1 to 2 feet. Dominant period 4 seconds. Waves subsiding to 1 foot in the afternoon.
Wednesday night..Northeast winds 5 to 10 knots. Waves 1 to 2 feet. Dominant period 4 seconds.
Thursday..Southeast winds 5 to 10 knots. Waves 1 foot or less. Dominant period 4 seconds.
Thursday night..East winds 5 to 10 knots. Waves 1 to 2 feet. Dominant period 4 seconds.
Friday..Southeast winds 5 to 10 knots. Waves 1 foot or less. Slight chance of showers and Thunderstorms.
Friday night..Southeast winds 5 to 10 knots. Waves 1 foot or less. Slight chance of showers and Thunderstorms.
GMZ500 Synopsis Pascagoula To Sw Pass Mississippi- Synopsis Sw Pass Mississippi River To Atchafalaya River- 417 Am Cdt Mon Mar 30 2020
Synopsis..A low pressure system develop over west texas today and move rapidly through the tennessee river valley Tuesday. This will bring a cold front through the waters during the morning and afternoon hours Tuesday with hazardous conditions developing. High pressure will settle over the waters behind this front for Wednesday and Thursday. The high will shift to the east by Friday as another area of low pressure begins to develop over texas.


7 Day Forecast for Marine Location Near Madisonville, LA
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location: 30.38, -90.16     debug


Area Discussion for - New Orleans/Baton Rouge, LA
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FXUS64 KLIX 300908 AFDLIX

Area Forecast Discussion National Weather Service New Orleans LA 408 AM CDT Mon Mar 30 2020

SYNOPSIS.

Frontal boundary currently near the Louisiana coast as noted by the upward trend in dew points at Boothville and Galliano over the last few hours, and lower 70s dew points on the oil platforms southwest and southeast of them (KMIS and KDLP). Weak high pressure centered near Memphis will gradually shift eastward today. A good bit of cirrus moving across the area early this morning, but other than some river fog near Boothville, no real indications of low cloud return quite yet. Temperatures generally mid 60s to lower 70s at 2 am CDT, with dew points in the 50s from New Orleans northward.

SHORT TERM.

Main concern will be the threat of convection late tonight and Tuesday morning. Boundary will lift northward today and tonight as upper impulse moves from the southwestern states this morning through the Tennessee Valley Tuesday and Tuesday night thanks to a 140+ knot upper jet. A surface low will track along Interstate 20, give or take a degree of latitude, and be south of Atlanta by midday Tuesday, with a trailing cold front about to clear the area at that time. Main hindrance to convection today and this evening will be a warm nose between 650 and 700 mb that is noted on the forecast soundings. Can't rule out a few shallow showers today and early this evening, but most locations should be dry. There appears to be a brief window overnight where conditions may be favorable for thunderstorms just ahead of the front. Lapse rates and instability don't raise a lot of red flags at this point, but could allow a few strong storms across our northern tier or two of counties/parishes. Main threat timing likely to be midnight-6 am CDT for our southwest Mississippi counties and bordering southeast Louisiana parishes, and during the morning hours from the Pearl River eastward. If there's any precipitation left after 18z, it would be the lower portions of Plaquemines Parish at best. Beyond that, dry weather.

Will continue trend of going above guidance on temperatures in this unseasonable pattern. Will need to watch high temperatures behind the front tomorrow. Similar to yesterday, a northerly post-frontal wind can lead to warmer . sometimes much warmer . than expected highs for northeast portions of our CWA including Slidell and the Mississippi coast due to subsidence. This is observed several times a year locally, mainly during the spring. Temperatures yesterday reached the upper 80s along the Mississippi coast (89 at Pascagoula). Will go at or above the warmer guidance numbers tomorrow, and may not be high enough. 35

LONG TERM.

High pressure will build in on Wednesday with dry and a return to near seasonal temperatures with highs in the lower to mid 70s and lows from the upper 40s inland to the middle to upper 50s near the coast. Surface high will slide east and an upper level ridge over the Ohio valley Thursday will keep dry conditions with a warming trend bringing high temperatures into the middle to upper 70s on Thursday and Friday. Upper level trough will dig through the eastern Rockies and into the central Plains by Thursday night and Friday. An associated cold front will move into the area Friday night and Saturday bringing an increase in chances of showers and thunderstorms by the upcoming weekend. Would note that blended PoPs for the weekend are considerably higher than the 00z operational runs of the GFS and ECMWF, so wouldn't be surprised to see later data pull back on the rain threat.

AVIATION.

Starting to see a few MVFR ceilings developing across the southern terminals, but not much below FL025. Soundings are still rather dry, so other than the MVFR ceilings, don't expect much in the way of flight restrictions today. Forecast soundings are not really supportive of TSRA until beyond 06z tonight. So, while there's no mention in current TAF package, there is likely to be a mention for at least KBTR, KMCB and potentially KHDC in the 12z package issuance. 35

MARINE.

Expect Small Craft Advisory conditions to develop behind the cold front Tuesday morning for the open waters, and Breton and Chandeleur Sounds, continuing through Tuesday night before easing Wednesday morning. Beyond that, don't anticipate much more than 10-12 knot winds for the remaining portion of the forecast. 35

DECISION SUPPORT.

DSS code: Blue. Deployed: None. Activation: None. Activities: Forecast support for COVID-19 outdoor testing locations. River Flood Warnings Monitoring convective trends tonight/Tuesday AM 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 80 67 81 50 / 0 60 40 0 BTR 81 69 82 50 / 10 50 30 0 ASD 83 69 84 51 / 0 40 50 0 MSY 83 72 85 56 / 10 30 40 0 GPT 80 70 82 53 / 0 30 50 0 PQL 83 67 84 51 / 0 30 60 0

LIX WATCHES/WARNINGS/ADVISORIES. LA . None. GM . Small Craft Advisory from 7 AM Tuesday to 7 AM CDT Wednesday for GMZ536-538-550-552-555-557-575-577.

MS . None. GM . Small Craft Advisory from 7 AM Tuesday to 7 AM CDT Wednesday for GMZ538-550-552-555-557-575-577.




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FREL1 23 mi48 min E 11 G 13 73°F 1018.7 hPa
NWCL1 - 8761927 - New Canal, LA 25 mi48 min E 8.9 G 13 73°F 75°F1018.6 hPa
CARL1 31 mi48 min 60°F
BYGL1 - 8762482 - Bayou Gauche, LA 43 mi72 min ENE 2.9 G 6 69°F 78°F1019.7 hPa
SHBL1 - 8761305 - Shell Beach, LA 44 mi48 min 73°F 78°F1020.3 hPa
WYCM6 - 8747437 - Bay Waveland Yacht Club, MS 44 mi54 min ENE 8 G 9.9 70°F 75°F1020.9 hPa

Wind History for New Canal Station, LA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hammond, Hammond Municipal Airport, LA17 mi61 minENE 410.00 miPartly Cloudy63°F51°F68%1020.3 hPa
Slidell, Slidell Airport, LA18 mi43 minNE 310.00 miPartly Cloudy63°F53°F70%1020.4 hPa
New Orleans, New Orleans Lakefront Airport, LA24 mi40 minE 810.00 miPartly Cloudy72°F57°F61%1019.3 hPa

Link to 5 minute data for KHDC

Wind History from HDC (wind in knots)
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N7NE7NE5N8NE5NE6E5CalmN4N3NE3N3E7NE6NE4E3N3E4CalmE3NE3
1 day agoS4S8S9
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S11S6S7S6S6S5SW8SW7W4NW4N5N4N3
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Tide / Current Tables for Paris Road Bridge, Mississippi River Delta, Louisiana
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Paris Road Bridge
Click for Map
Mon -- 12:09 AM CDT     Moonset
Mon -- 06:49 AM CDT     -0.14 feet Low Tide
Mon -- 06:50 AM CDT     Sunrise
Mon -- 10:47 AM CDT     Moonrise
Mon -- 07:17 PM CDT     Sunset
Mon -- 07:23 PM CDT     1.02 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.40.20.1-0-0.1-0.1-0.1-0.1-000.20.30.40.60.70.80.911110.90.8

Tide / Current Tables for Long Point, Lake Borgne, Louisiana
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Long Point
Click for Map
Mon -- 12:08 AM CDT     Moonset
Mon -- 03:22 AM CDT     -0.13 feet Low Tide
Mon -- 06:49 AM CDT     Sunrise
Mon -- 10:45 AM CDT     Moonrise
Mon -- 04:43 PM CDT     0.92 feet High Tide
Mon -- 07:16 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.1-0-0.1-0.1-0.1-0.1-00.10.20.30.40.50.60.70.80.90.90.90.90.80.70.60.50.3

Weather Map
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wmap_A
GEOS 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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for New Orleans/Baton Rouge, LA (8,2,3,4)
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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 numerous 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.