Sunday, July25, 2021
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Marine Weather and Tides
New Orleans, LA

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:14AMSunset 7:59PM Sunday July 25, 2021 11:04 AM CDT (16:04 UTC) Moonrise 8:38PMMoonset 6:42AM Illumination 98% Phase: Waning Gibbous; 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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GMZ530 Lake Pontchartrain And Lake Maurepas- 1001 Am Cdt Sun Jul 25 2021
Rest of today..North winds near 5 knots becoming southeast in the afternoon. Waves less than 1 foot. Dominant period 4 seconds. Chance of showers and Thunderstorms in the late morning and afternoon.
Tonight..Southeast winds 5 to 10 knots becoming southwest in the late evening. Waves 1 foot or less. Dominant period 4 seconds. Slight chance of showers and Thunderstorms early in the evening.
Monday..Southwest winds near 5 knots becoming southeast in the late morning and afternoon. Waves 1 foot or less. Dominant period 4 seconds. Chance of showers and Thunderstorms through the day.
Monday night..Southwest winds 5 to 10 knots becoming west after midnight. Waves 1 foot or less. Dominant period 4 seconds.
Tuesday..Northwest winds near 5 knots becoming northeast late in the morning, then becoming southeast in the afternoon. Waves less than 1 foot. Dominant period 4 seconds. Chance of showers and Thunderstorms in the afternoon.
Tuesday night..South winds near 5 knots becoming southwest after midnight. Waves less than 1 foot. Dominant period 4 seconds. Slight chance of showers and Thunderstorms through the night.
Wednesday..Northwest winds near 5 knots becoming north late in the morning, then becoming southeast in the afternoon. Waves less than 1 foot. Dominant period 4 seconds. Chance of showers and Thunderstorms in the morning, then showers and Thunderstorms likely in the afternoon.
Wednesday night..Southeast winds near 5 knots becoming south after midnight, then becoming west after midnight. Waves less than 1 foot. Dominant period 4 seconds. Chance of showers and slight chance of Thunderstorms.
Thursday..North winds near 5 knots becoming southeast in the afternoon. Waves less than 1 foot. Dominant period 4 seconds. Chance of showers and Thunderstorms in the morning, then showers and Thunderstorms likely in the afternoon.
Thursday night..Southwest winds near 5 knots. Waves less than 1 foot. Dominant period 4 seconds. Slight chance of showers and Thunderstorms through the night.
GMZ500 Synopsis Pascagoula To Sw Pass Mississippi- Synopsis Sw Pass Mississippi River To Atchafalaya River- 1001 Am Cdt Sun Jul 25 2021
Synopsis..High pressure will remain centered over the southern plains. A weak trough of low pressure will move toward the gulf coast and the coastal waters on Tuesday. The trough should then stall along or just inland from the coast for the remainder of next week.


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 251452 AFDLIX

Area Forecast Discussion National Weather Service New Orleans LA 952 AM CDT Sun Jul 25 2021

MORNING UPDATE. Updates to POP, weather, QPF, and sky cover grids to better reflect ongoing radar and satellite trends. POP was increased in the waters west of the Mississippi river and over coastal portions of Southeast Louisiana with chance POP of 30 to 40 percent now in place as compared to the 10 to 20 percent in the forecast initially. Sky cover grids were updated to reflect a band of cloud cover extending from around Hattiesburg southward into portions of the Northshore. Sky cover was also increased along the Louisiana coast to reflect the ongoing convection. Weather and QPF grids have been updated to align with the POP coverage. Temperatures and dewpoints are tracking well with observed conditions and the heat advisory in place will remain unchanged. PG

PREV DISCUSSION. /issued 520 AM CDT Sun Jul 25 2021/

SHORT TERM (Sunday through Tuesday) .

Water vapor imagery depicts a cyclonic shear axis extending from the southwest Louisiana coast east-southeastward across the north Gulf with easterlies and drier air in the upper levels having moved through the forecast area. One other notable feature this morning is an axis of low level moisture pooling with isolated showers extending from east of Tylertown to metro New Orleans.

The expansive mid to upper level high pressure area will remain just off to the north and west of the region which will keep the forecast area in a battle between very warm/hot low level temperatures and scattered diurnally driven convection with precipitable water values of 1.8 to 2.1 inches expected throughout the daytime hours. High temperatures are once again expected to reach the mid 90s in most areas just inland from the immediate coast to go along with continued high dewpoint temperatures in the mid to upper 70s with some locations again up around 80. Since yesterday overachieved with respect to the highs and dewpoints in some areas, have adjusted the hourly NBM values up to account for the recent bias. The forecast maximum heat index today is in the 107 to 112 degree range across most areas except the far southeast coastal areas from Jackson and Harrison Counties in Mississippi to the extreme southeast coastal areas of Louisiana and some areas on the west side of metro Baton Rouge. There is the chance some areas could see earlier development of scattered showers and thunderstorms which could keep the duration and level of heat a bit lower, however confidence is low on if and where that will happen. Therefore, have expanded the Heat Advisory to include all of metro New Orleans and Hancock County. Like yesterday, some of the stronger thunderstorms that develop could produce frequent lightning strikes and some gusty winds as high as 30 to 40 mph along with mostly brief heavy downpours. A few of the showers and storms will likely linger into the evening hours before dissipating by late evening.

The models still indicate some drier air will likely move into portions of the forecast area from east to west on Monday. Have continued to follow the NBM guidance keeping the higher 40 to 60% chances of showers and thunderstorms in northern/western areas and 20 to 30% in areas south of the tidal lakes and near the coast. High temperatures should remain hot with plenty of mid 90s expected for most inland areas. Maximum heat index values are forecast to remain below the Heat Advisory criteria of 108, but cannot rule out some hotter locations. Once again, there will be plenty of instability for some thunderstorms to become strong and produce frequent lightning, gusty winds and some torrential downpours.

Monday night into Tuesday morning should be mostly dry with the lower precipitable water lingering over the forecast area, however many areas should see higher moisture content in the afternoon and have a 30 to 50% chance of showers and thunderstorms. Temperatures will continue to be hot for highs with mid 90s inland and lower 90s on the coast.

LONG TERM (Tuesday night and beyond) .

Main forecast concern during the extended period will be the daily threat of thunderstorms. Medium range solutions have shifted a little bit eastward with the center of the upper ridge, near the Kansas-Colorado border. The question is whether that will be far enough east to put the local area in subsidence to suppress convection. At this time, it looks like daily diurnal convection will continue to be a threat for the 2nd half of the week into the weekend. The 12z medium range operational solutions would indicate that the NBM PoPs are too high, but with the models going back and forth on the ridge the last couple days, won't back off the PoPs quite yet.

Somewhat concerned about the high temperature forecast, as we've been trending above guidance, especially the last couple of days. If the drying trend continues, we'll need to bump up highs, possibly beyond what the 12z ECMWF would suggest. Right now, we're consistent with neighboring offices, just something to keep in mind.

AVIATION .

Primarily a VFR forecast. All indications are that convection during the day Sunday will be mainly an afternoon affair, and will carry VCTS in terminals until it becomes more clear where the direct impacts will be. Most likely direct impacts would be IFR visibilities and wind gusts to 25-30 knots. Most storms should dissipate near or before sunset again Sunday evening.

MARINE .

Very benign conditions are expected across the coastal waters through next week. Light winds of 10 knots or less and seas mostly less than 3 feet are forecast through the period. Scattered thunderstorm activity each day will be the primary concern. These storms could produce brief periods of gusty winds, choppy seas, and possibly a few waterspouts.

PRELIMINARY POINT TEMPS/POPS. MCB 95 76 93 74 / 50 20 50 10 BTR 95 76 94 76 / 50 20 60 10 ASD 95 76 95 76 / 50 20 30 10 MSY 97 81 95 79 / 50 20 30 10 GPT 93 77 93 76 / 50 20 20 10 PQL 95 75 94 76 / 50 20 20 10

LIX WATCHES/WARNINGS/ADVISORIES. LA . Heat Advisory until 7 PM CDT this evening for LAZ034>037-039- 046>050-056>061-063>067-071-072-075>078.

GM . None. MS . Heat Advisory until 7 PM CDT this evening for MSZ068>071-077-080.

GM . None.


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NWCL1 - 8761927 - New Canal, LA 4 mi46 min NNE 5.1 G 6 84°F 89°F1015.8 hPa
CARL1 10 mi46 min 85°F
FREL1 19 mi46 min NNE 2.9 G 4.1 89°F 1015.6 hPa
SHBL1 - 8761305 - Shell Beach, LA 25 mi46 min NE 4.1 G 5.1 85°F 89°F1016.8 hPa
BYGL1 - 8762482 - Bayou Gauche, LA 27 mi46 min WNW 6 G 8 86°F 89°F1016.8 hPa
WYCM6 - 8747437 - Bay Waveland Yacht Club, MS 43 mi46 min ENE 1.9 G 1.9 90°F 85°F

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 mi71 minNNE 610.00 miFair88°F78°F73%1016.1 hPa
New Orleans, New Orleans International Airport, LA12 mi71 minN 510.00 miMostly Cloudy90°F78°F68%1016.8 hPa
New Orleans Naval Air Station - Alvin Callender Field, LA17 mi69 minNNE 410.00 miMostly Cloudy87°F81°F82%1016.2 hPa
Slidell, Slidell Airport, LA23 mi71 minNE 610.00 miFair89°F75°F63%1016.3 hPa

Link to 5 minute data for KNEW

Wind History from NEW (wind in knots)
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Last 24hrNW8NW8W6W5W5NE6NE6SE7SE8SE8S6SW5SE3W3SW3W4N4N3E4CalmCalmN6NE6N5
1 day agoNW8NW7NW6W5W6W8W6W5W10W14W15W14W10W9W12W13NW13NW14NW15NW16NW17NW16N12N11
2 days agoNW7NW7N7NW8NW7N3--CalmSE5S4W11SW6W11W11W11W7SW8W13W13NW13NW11NW10NW12NW11

Tide / Current Tables for Paris Road Bridge, Mississippi River Delta, Louisiana
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Paris Road Bridge
Click for Map
Sun -- 04:14 AM CDT     -0.19 feet Low Tide
Sun -- 06:14 AM CDT     Sunrise
Sun -- 07:41 AM CDT     Moonset
Sun -- 04:37 PM CDT     1.55 feet High Tide
Sun -- 07:57 PM CDT     Sunset
Sun -- 09:36 PM CDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20-0.1-0.2-0.2-0.2-0.1-00.10.30.50.70.91.11.31.51.51.51.51.41.210.80.6

Tide / Current Tables for Long Point, Lake Borgne, Louisiana
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Long Point
Click for Map
Sun -- 12:47 AM CDT     -0.17 feet Low Tide
Sun -- 06:13 AM CDT     Sunrise
Sun -- 07:39 AM CDT     Moonset
Sun -- 01:57 PM CDT     1.40 feet High Tide
Sun -- 07:56 PM CDT     Sunset
Sun -- 09:35 PM CDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.2-0.2-0.1-0.100.10.30.50.60.811.21.31.41.41.41.31.110.80.60.40.20.1

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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