Thursday, September23, 2021
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Marine Weather and Tides
Laplace, 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 6:49AMSunset 6:58PM Thursday September 23, 2021 6:31 PM CDT (23:31 UTC) Moonrise 7:43PMMoonset 8:10AM Illumination 93% Phase: Waning Gibbous; Moon at 17 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- 304 Pm Cdt Thu Sep 23 2021
Tonight..Northeast winds 5 to 10 knots. Waves 1 to 2 feet. Dominant period 4 seconds.
Friday..Northeast winds 5 to 10 knots. Waves 1 to 2 feet. Dominant period 4 seconds.
Friday night..Northeast winds 5 to 10 knots. Waves 1 foot or less. Dominant period 4 seconds.
Saturday..Northeast winds 5 to 10 knots. Waves 1 foot or less. Dominant period 4 seconds.
Saturday night..Northeast winds near 5 knots. Waves less than 1 foot. Dominant period 4 seconds.
Sunday..Northeast winds 5 to 10 knots becoming east late in the afternoon. Waves 1 foot or less. Dominant period 4 seconds.
Sunday night..Southeast winds near 5 knots. Waves less than 1 foot. Dominant period 4 seconds.
Monday..East winds 5 to 10 knots becoming southeast late in the afternoon. Waves 1 foot or less. Dominant period 4 seconds.
Monday night..Southeast winds 5 to 10 knots. Waves 1 foot or less. Dominant period 4 seconds.
Tuesday..East winds 5 to 10 knots. Waves 1 foot or less. Dominant period 4 seconds. Slight chance of showers through the day. Slight chance of Thunderstorms in the afternoon.
Tuesday night..Southeast winds 5 to 10 knots. Waves 1 foot or less. Dominant period 4 seconds. Slight chance of showers after midnight.
GMZ500 Synopsis Pascagoula To Sw Pass Mississippi- Synopsis Sw Pass Mississippi River To Atchafalaya River- 304 Pm Cdt Thu Sep 23 2021
Synopsis.. High pressure will continue to build in over the area, bringing lighter offshore winds through the weekend and into early next week.


7 Day Forecast for Marine Location Near Laplace, LA
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location: 30.17, -90.33     debug


Area Discussion for - New Orleans/Baton Rouge, LA
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FXUS64 KLIX 232016 AFDLIX

Area Forecast Discussion National Weather Service New Orleans LA 316 PM CDT Thu Sep 23 2021

SHORT TERM (This evening through Saturday Night).

Very pleasant and comfortable conditions will continue this evening and into the overnight hours. Decoupling this evening will allow for surface winds to diminish with time, with clear skies prevailing. Main target of opportunity for the next 24 hours was focusing on the morning lows early Friday - keeping the trend of a cooler bias against the deterministic NBM. This places many locations bottoming out in the lower to mid 50's (lower 60's across the Southshore and coastal SE LA due to warmer waters surrounding). This will be a good 10 to 15 degrees below climatological lows, but we should refrain from breaking any record lows at climate sites (could be close for a few). Kept maximized lowest bias in temperatures confined to typical drainage locations across the northshore to coastal MS where temperatures might drop as cool as the the 49-51F degree range.

Going into the day on Friday, not much changing as high pressure remains in control mid-Atlantic. Winds will be a tad lighter during the day, but we will mix out quickly where typical modifications to dewpoints were performed in the afternoon hours - going lower against NBM values to reveal more realistic mixing processes. Otherwise combing through model soundings, seeing some noticeable moisture advection in the 200-250mb layer, in response to a weakening shortwave impulse ejecting northeast out of the southwestern US - advecting moisture east along a quasi-zonal west to east flow aloft. So just a few thin cirrus during the day. Also, can't rule out some patchy, shallow low-level Cu as there is just barely enough moisture present at the base of a strong subsidence inversion settled around H9/at the top of the PBL.

Same minor attention given to lows Saturday morning with radiational cooling building in strong once again, biasing on the lower end of NBM ensemble spread, but not AS chilly as previous mornings placing many in the mid to upper 50's (mid to upper 60's southshore and coastal SE LA). Adjusted dewpoints a tad lower again going into the afternoon due to mixing, but the only main differences is a little more moisture in the H2 to H5 layer which could introduce some thin/patchy clouds in the mid to upper- levels, but generally speaking another beautiful day which pleasant conditions continuing into Saturday night. KLG

LONG TERM (Sunday through Wednesday Night).

Beautiful weather will continue through the rest of the weekend into Sunday, but temperatures stair step up a degree or two warmer each day as upper-level ridging builds from the southern Plains on north. A very quick moving shortwave trough will progress east across the Midwest and into the northeast this weekend, leaving behind a tail of stretched mid-level vorticity within the ridge axis - likely only leading to continued patchy/thin upper-level clouds but overall, beautiful weather will close out the weekend.

Next week, focus will be on a closed off upper-low within larger- scale ridging over the western and central US. This upper-low will meander for a few days, but eventually drift east and weaken across the southern/central US. Meanwhile, surface high pressure nudges east off shore the eastern US, which will position us into a slow and steady return flow pattern. Seeing some long-range guidance hinting at showers returning across the northwestern Gulf in the vicinity of deeper moisture advection west of a 1560dm 850mb ridge located in the far eastern Gulf. Given enough veering/curvature and WAA building in this region, it seems plausible that scattered showers will break out across coastal SE Texas and southern LA on Monday, with this activity slowly progressing closer to our neck of the woods Tuesday and Wednesday as this low-level high drifts north and patchy areas of PVA builds in from the west. Not going to fight the NBM on 20 to 30% pop mainly focused on southwestern areas of the CWA, but it'll be interesting to see how far east this activity can progress. This same upper-low eventually becomes sheared out along the western edge of a steep ridge axis right along the entire MS river valley mid to late week, keeping a mention of PoP's going even into later parts of next week. KLG

AVIATION (18z DISCUSSION).

Expect VFR conditions for all area terminals through the forecast period. SKC can be anticipated today, but with breezy northeasterly winds in excess of 08 to 12 knots at the surface, and occasionally higher gusts. Winds diminish around and after sunset this evening with clear/calm conditions persisting through daybreak Friday. KLG

MARINE.

Post-frontal northeasterly flow will persist tonight and into the day tomorrow, with winds, wind gusts and seas lowering with time. Conditions remain calm through this weekend and into early next week, with a steady transition in surface winds expected from the east to eventual southeast. Moisture will increase to follow with a few scattered showers through mid-week, but impacts will remain minimal at this time. KLG

PRELIMINARY POINT TEMPS/POPS. MCB 52 78 55 82 / 0 0 0 0 BTR 53 78 54 82 / 0 0 0 0 ASD 53 80 55 84 / 0 0 0 0 MSY 63 80 64 83 / 0 0 0 0 GPT 55 80 57 83 / 0 0 0 0 PQL 52 79 55 82 / 0 0 0 0

LIX WATCHES/WARNINGS/ADVISORIES. LA . None. GM . None. MS . None. GM . None.


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NWCL1 - 8761927 - New Canal, LA 15 mi43 min NNE 8 G 9.9 76°F 80°F1015.9 hPa
CARL1 19 mi43 min 82°F
BYGL1 - 8762482 - Bayou Gauche, LA 27 mi43 min 76°F 80°F1017 hPa
SHBL1 - 8761305 - Shell Beach, LA 41 mi49 min WNW 2.9 G 4.1 75°F 81°F1016.9 hPa

Wind History for East Bank 1, Norco, B. LaBranche, LA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
New Orleans, New Orleans International Airport, LA14 mi38 minNW 410.00 miFair76°F53°F45%1017 hPa
New Orleans, New Orleans Lakefront Airport, LA18 mi38 minN 1010.00 miFair78°F52°F40%1016.1 hPa

Link to 5 minute data for KMSY

Wind History from MSY (wind in knots)
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2 days agoS7SE5S6S7S8S7S3S3SW3W3W3CalmCalmCalmCalmNW5SW7
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CalmNW5N5SW10S6SW5SW5

Tide / Current Tables for Paris Road Bridge, Mississippi River Delta, Louisiana
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Paris Road Bridge
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Thu -- 04:38 AM CDT     1.03 feet High Tide
Thu -- 06:48 AM CDT     Sunrise
Thu -- 09:08 AM CDT     Moonset
Thu -- 02:30 PM CDT     0.57 feet Low Tide
Thu -- 06:54 PM CDT     Sunset
Thu -- 08:40 PM CDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.90.91111110.90.80.80.70.60.60.60.60.60.60.70.70.80.80.90.9

Tide / Current Tables for Long Point, Lake Borgne, Louisiana
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Long Point
Click for Map
Thu -- 01:58 AM CDT     0.93 feet High Tide
Thu -- 06:47 AM CDT     Sunrise
Thu -- 09:07 AM CDT     Moonset
Thu -- 11:03 AM CDT     0.51 feet Low Tide
Thu -- 06:53 PM CDT     Sunset
Thu -- 08:39 PM CDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.90.90.90.90.90.80.80.70.60.60.50.50.50.60.60.60.70.70.70.80.80.80.90.9

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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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