Thursday, April22, 2021
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Marine Weather and Tides
Lafitte, LA

Version 3.4
NOTICE
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 6:24AMSunset 7:33PM Thursday April 22, 2021 8:30 AM CDT (13:30 UTC) Moonrise 1:53PMMoonset 2:43AM Illumination 80% Phase: Waxing Gibbous; Moon at 10 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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GMZ538 Expires:202104222215;;937493 Fzus54 Klix 220914 Cwflix Coastal Waters Forecast National Weather Service New Orleans La 414 Am Cdt Thu Apr 22 2021 Pascagoula To Atchafalaya River Out To 60 Mile Seas Are Provided As A Range Of The Average Height Of The Highest 1/3 Of The Waves...along With The Occasional Height Of The Average Highest Ten Percent Of The Waves. Gmz536-538-222215- Chandeleur Sound-breton Sound- 414 Am Cdt Thu Apr 22 2021
.small craft exercise caution in effect through this evening...
Today..East winds 15 to 20 knots. Waves 3 to 5 feet. Dominant period 4 seconds. Waves or seas subsiding to 2 to 4 feet. Dominant period 4 seconds in the afternoon.
Tonight..Southeast winds 10 to 15 knots. Waves 2 to 4 feet. Dominant period 4 seconds.
Friday..Southeast winds 15 to 20 knots. Waves 3 to 5 feet. Dominant period 4 seconds. Chance of showers and Thunderstorms in the afternoon.
Friday night..South winds 20 to 25 knots. Waves 3 to 5 feet. Dominant period 4 seconds. Chance of showers and Thunderstorms.
Saturday..Southwest winds 15 to 20 knots. Waves 3 to 6 feet. Dominant period 4 seconds. Showers and Thunderstorms likely in the morning, then chance of showers in the afternoon.
Saturday night..West winds 15 to 20 knots becoming north in the late evening. Waves 3 to 5 feet. Dominant period 4 seconds.
Sunday..Northeast winds 15 to 20 knots becoming east near 10 knots late in the afternoon. Waves 3 to 5 feet. Dominant period 4 seconds. Waves or seas subsiding to 1 to 2 feet. Dominant period 4 seconds in the afternoon.
Sunday night..East winds 10 to 15 knots. Waves 1 to 2 feet. Dominant period 4 seconds.
Monday..East winds 10 to 15 knots. Waves 2 to 4 feet. Dominant period 4 seconds.
Monday night..Southeast winds 15 to 20 knots. Waves 2 to 4 feet. Dominant period 4 seconds.
GMZ500 Synopsis Pascagoula To Sw Pass Mississippi- Synopsis Sw Pass Mississippi River To Atchafalaya River- 414 Am Cdt Thu Apr 22 2021
Synopsis..High pressure will remain over the coastal waters through tonight. A low pressure system and trailing cold front will then affect the waters on Friday and Saturday. High pressure will then settle back over the region for Sunday and Monday.


7 Day Forecast for Marine Location Near Lafitte, LA
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location: 29.54, -90.06     debug


Area Discussion for - New Orleans/Baton Rouge, LA
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FXUS64 KLIX 220914 AFDLIX

Area Forecast Discussion National Weather Service New Orleans LA 414 AM CDT Thu Apr 22 2021

SHORT TERM (Today through Saturday Night). High pressure begins to move east today allowing moisture to begin streaming back into the area along with a warm front Friday. This will be the first area of two fronts that we will need to focus on with respect to severe wx. The warm front begins to move through the area around noon Friday with TS development along and south of the boundary. Numbers that buoy severe thunderstorms are moderate to high and some are impressive but conditional, but it shouldn't take much to get something going, so thoughts are that we will see several make it to this severe category between Friday and Saturday. These severe wx numbers do not look good until the warm front boundary passes a location, but once in the warm sector, there is plenty of instability. Helicity values are off the charts for 0-3km of 550-650 and all storms being sfc based will make tornadoes possible. Steep mid-level lapse rates and low Wet Bulb0 numbers give rise to large hail. Damaging winds will be a possibility as well with these, so all modes will be possible Friday afternoon and evening. Then the cold front moves through Sunday and will posses the same environmental instability as the warm front provided to keep the threat for severe thunderstorms going through Saturday afternoon.

LONG TERM (Sunday through Wednesday). A deep layer ridge axis and strong subsidence throughout the atmospheric column will keep skies clear, humidity values low, and temperatures near to slightly above normal during the day. Highs will easily climb into the lower to middle 80s both Sunday and Monday. Temperatures Sunday night will cool into the upper 50s and lower 60s. An increase in low level moisture advection and dewpoints is anticipated by late Monday night as the ridge axis begins to push a bit to the east and this will keep lows a bit warmer in the lower to middle 60s.

Conditions will begin to transition back to a more unsettled weather regime on Tuesday, but a strong mid-level capping inversion during the day will prohibit any convection from initiating. Below this inversion, strong lapse rates will promote the development of a scattered to broken strato-cumulus field, and a few light marine layer showers may develop by the late afternoon hours. Temperatures will remain warmer than average with highs climbing into the middle 80s at many locations. Only the coast should remain slightly cooler in the upper 70s and lower 80s.

By Tuesday night and Wednesday, the region will be under the full influence of a strong longwave trough axis kicking out of the desert Southwest. Strong difluent flow and favorable jet dynamics aloft will promote stronger lift and increased cloud development through the overnight hours. There will continue to be some weakness in the mid-level lapse rates as a pool of drier air lingers, but enough dynamic forcing will be in place to support some isolated shower and thunderstorm activity over the northwest portion of the forecast area.

The main thrust of the longwave trough will be felt on Wednesday as a negatively tilted trough axis and fairly strong front sweep through the area. Strong forcing and ample thermodynamic support with temperatures warming back into the lower to middle 80s will be in place to support scattered shower and thunderstorm activity through the day and into Wednesday night. There are still some timing differences between the models on exactly when the front will sweep through the area, but in general a rather unsettled day can be expected. Currently, shear profiles would suggest the potential for another round of severe convection in the area, but it is too far out to pinpoint the timing or exact convective mode of any severe thunderstorms. We will continue to monitor this potential severe thunderstorm threat over the coming days. PG

AVIATION. VFR will continue at all terminals through tonight. Winds will shift from the northeast to the southeast during the day today and could gust over 15 knots at times at KNEW, KGPT, KHUM, and KMSY.

MARINE. Moderate northerly flow will become easterly today as high pressure builds east. Caution statements will remain through today as winds ease. But moderate southeasterly flow expected on Friday, before shifting southerly and increasing to moderate to strong overnight ahead of another cold front. Any periods where winds will be below 15 knots will be brief for most of the open waters over the next several days, with no real respite until the weekend.

PRELIMINARY POINT TEMPS/POPS. MCB 69 51 73 62 / 0 10 50 90 BTR 70 55 75 65 / 0 10 70 80 ASD 70 54 75 65 / 0 10 50 70 MSY 69 59 76 68 / 0 10 50 70 GPT 67 56 72 65 / 0 0 30 70 PQL 70 53 74 64 / 0 0 20 70

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
GISL1 - 8761724 - Grand Isle, LA 20 mi43 min 13 G 18 67°F
BYGL1 - 8762482 - Bayou Gauche, LA 26 mi43 min NE 5.1 G 8.9 55°F 67°F1022.5 hPa
CARL1 27 mi43 min 65°F
SHBL1 - 8761305 - Shell Beach, LA 31 mi43 min ENE 18 G 21 58°F 68°F1022.5 hPa
NWCL1 - 8761927 - New Canal, LA 34 mi43 min E 15 G 19 56°F 66°F1021.5 hPa
LUML1 - LUMCON Marine Center, LA 38 mi181 min 11 G 12 58°F 1019 hPa
FREL1 44 mi43 min ENE 14 G 18 58°F 1021.9 hPa
LOPL1 - Louisiana Offshore Oil Port, LA 45 mi75 min ENE 20 G 24 62°F 1021.1 hPa46°F
PILL1 49 mi43 min E 7 G 16 61°F 64°F1021.4 hPa

Wind History for Grand Isle, LA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Galliano, South Lafourche Airport, LA13 mi36 minNE 810.00 miFair76°F71°F86%1021.7 hPa
New Orleans Naval Air Station - Alvin Callender Field, LA20 mi36 minE 1010.00 miA Few Clouds57°F46°F67%1022.1 hPa

Link to 5 minute data for KGAO

Wind History from GAO (wind in knots)
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N9N6N3N3N3NE6NE8NE6NE7NE5NE4NE5NE6NE6NE10
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1 day agoN5NE6NE5N5NE3N3NE5CalmSW3S5S5CalmSW3CalmW3CalmCalmCalmCalmNW5NW7N10N11
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NE11N8NE8E4E6N6E4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNW3NW4

Tide / Current Tables for Manilla, Mississippi River Delta, Louisiana
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Manilla
Click for Map
Thu -- 03:42 AM CDT     Moonset
Thu -- 06:26 AM CDT     Sunrise
Thu -- 07:55 AM CDT     -0.04 feet Low Tide
Thu -- 02:52 PM CDT     Moonrise
Thu -- 07:31 PM CDT     Sunset
Thu -- 08:27 PM CDT     0.83 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.70.50.40.30.20.10-0-0-000.10.20.30.40.50.60.70.70.80.80.80.80.8

Tide / Current Tables for Independence Island, Mississippi River Delta, Louisiana
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Independence Island
Click for Map
Thu -- 03:42 AM CDT     Moonset
Thu -- 06:26 AM CDT     Sunrise
Thu -- 06:41 AM CDT     -0.03 feet Low Tide
Thu -- 02:52 PM CDT     Moonrise
Thu -- 07:30 PM CDT     Sunset
Thu -- 08:24 PM CDT     0.75 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.40.30.20.10-0-0-000.10.20.30.40.40.50.60.60.70.70.70.70.70.7

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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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