Saturday, January16, 2021
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Marine Weather and Tides
Houma, LA

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 6:57AMSunset 5:28PM Saturday January 16, 2021 2:14 AM CST (08:14 UTC) Moonrise 9:40AMMoonset 9:05PM Illumination 9% Phase: Waxing Crescent; Moon at 3 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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GMZ550 Coastal Waters From Port Fourchon La To Lower Atchafalaya River La Out 20 Nm- Coastal Waters From The Southwest Pass Of The Mississippi River To Port Fourchon Louisiana Out 20 Mile- 939 Pm Cst Fri Jan 15 2021
.small craft advisory in effect through Saturday afternoon...
Rest of tonight..Northwest winds 25 to 30 knots. Seas 5 to 8 feet with occasional seas to 10 feet building to 8 to 12 feet with occasional seas to 13 feet. Dominant period 6 seconds.
Saturday..West winds 20 to 25 knots easing to 15 to 20 knots late. Seas 6 to 10 feet with occasional seas to 11 feet subsiding to 4 to 7 feet with occasional seas to 8 feet. Dominant period 4 seconds.
Saturday night..Northwest winds 10 to 15 knots. Seas 3 to 5 feet. Dominant period 5 seconds.
Sunday..Northwest winds 5 to 10 knots. Seas 1 to 2 feet. Dominant period 5 seconds.
Sunday night..Northwest winds 10 to 15 knots. Seas 1 to 2 feet. Dominant period 4 seconds.
Monday..North winds 10 to 15 knots becoming east 5 to 10 knots in the afternoon. Seas 1 to 2 feet. Dominant period 4 seconds.
Monday night..Southeast winds 10 to 15 knots. Seas 1 to 2 feet. Dominant period 4 seconds.
Tuesday..East winds 10 to 15 knots. Seas 2 to 4 feet.
Tuesday night..Southeast winds 10 to 15 knots. Seas 2 to 4 feet.
Wednesday..Southeast winds 10 to 15 knots. Seas 2 to 4 feet.
Wednesday night..South winds 10 to 15 knots. Seas 2 to 4 feet.
GMZ500 Synopsis Pascagoula To Sw Pass Mississippi- Synopsis Sw Pass Mississippi River To Atchafalaya River- 939 Pm Cst Fri Jan 15 2021
Synopsis..A broad area of high pressure will settle over the area through Saturday. Another cold front is expected to sweep across the waters on Sunday. High pressure will once again build over the area by Monday before shifting toward the eastern gulf Tuesday.


7 Day Forecast for Marine Location Near Houma, LA
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location: 29.58, -90.71     debug


Area Discussion for - New Orleans/Baton Rouge, LA
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FXUS64 KLIX 160524 AFDLIX

Area Forecast Discussion National Weather Service New Orleans LA 1124 PM CST Fri Jan 15 2021

UPDATE.

Updated for 06z TAF discussion.

AVIATION.

VFR conditions will prevail through Saturday night with mostly clear skies and excellent visibilities. 22/TD

PREV DISCUSSION. /issued 346 PM CST Fri Jan 15 2021/

SHORT TERM (Tonight through Sunday Night) . A very dry and very stable airmass will dominate the Gulf South through Sunday night. This airmass will be the result of continued deep layer northwest flow and strong subsidence on the western side of strong longwave trough parked over the eastern third of the nation. A weak shortwave and reinforcing front will sweep through on the back of this deep layer northwest flow Sunday, but the lack of available moisture will bring nothing more than some increased cloud cover. Cold air will also continue to advect into the area, and this will keep temperatures cooler than average through the period. Highs will only warm into the 50s and lows will drop into the 30s.

LONG TERM (Monday through Friday) . Little change in thinking from the previous forecast. A large shift in the mid to upper level pattern will occur on Monday and continue through next Friday. All of the model guidance indicates that a broad and deep layer ridge axis will develop over the Gulf of Mexico and extend northward across the Gulf South. This ridge axis will be centered directly over the forecast area on Monday. Strong subsidence will bring clear skies and warmer temperatures closer to seasonal norms for both Monday and Monday night.

The ridge axis will shift toward the eastern Gulf by Tuesday and this will allow for a deep layer onshore flow from the Gulf of Mexico to develop. Tuesday will be a day of transition with onshore flow developing and moisture beginning to feed back into the area. Temperatures will continue to modify with temperatures warming into the upper 60s and lower 70s by the afternoon and only cooling into the upper 40s and lower 50s by late Tuesday night. Sea fog will be less likely Tuesday night, but radiation fog may develop over inland areas.

A well established marine layer will come to dominate the forecast area on Wednesday and then continue through Friday morning. A review of model soundings, water temperatures, dewpoint spreads, and the strength of the boundary layer flow show favorable conditions for several nights of advection or sea fog development across the region both Wednesday and Thursday nights. As the fog lifts and breaks out into a strato- cumulus field on Wednesday and Thursday, some marine layer showers could also develop. Model soundings indicate very weak mid-level lapse rates and a mid- level capping inversion, and this will limit convective activity to low topped marine layer showers. Temperatures will be very mild during this period with lows in the 50s and highs in the lower to middle 70s each day.

All of the guidance indicates that a weak shortwave trough will slide to the north of the region on Friday, and this will push a weak cold front through the area. Winds should shift to the north and a slightly colder airmass should advect in.

AVIATION . The 00z TAF package will show continued VFR conditions at all of the terminals as a dry and stable airmass advects into the area. Winds will begin to relax this evening at most of the terminals, but will remain gusty at KGPT, KNEW, and KMSY. There could also be a period of increased low level wind shear as strong boundary layer flow persists. West-northwest wind shear of 30 to 40 knots could be expected in the lowest 2k feet from 00z through 06z before waning.

MARINE . Strong northwest flow will continue as a colder and drier airmass advects into the region. Winds of 20 to 30 knots and hazardous seas will keep small craft advisory conditions in place through tomorrow afternoon. The gradient flow should begin to relax over the waters tomorrow night as high pressure becomes centered over the forecast area. This high will remain in place through Monday night before shifting toward the eastern Gulf by the middle of next week. Winds will relax to around 10 knots or less and shift from the north to the southeast as the high slides across the waters and into the eastern Gulf. Seas will decline to 2 to 4 feet or less as the wind field relaxes.

PRELIMINARY POINT TEMPS/POPS. MCB 32 53 32 57 / 0 0 0 0 BTR 33 55 34 59 / 0 0 0 0 ASD 32 55 32 58 / 0 0 0 0 MSY 37 55 37 57 / 0 0 0 0 GPT 34 55 35 57 / 0 0 0 0 PQL 31 55 31 58 / 0 0 0 0

LIX WATCHES/WARNINGS/ADVISORIES. LA . None. GM . Small Craft Advisory until 3 PM CST Saturday for GMZ536-538-550- 552-555-557-570-572-575-577.

Small Craft Advisory until 6 AM CST Saturday for GMZ530-532-534.

MS . None. GM . Small Craft Advisory until 3 PM CST Saturday for GMZ538-550-552- 555-557-570-572-575-577.

Small Craft Advisory until 6 AM CST Saturday for GMZ532-534.




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BYGL1 - 8762482 - Bayou Gauche, LA 21 mi56 min WSW 2.9 G 5.1 42°F 50°F1016.8 hPa
TESL1 - Tesoro Marine Terminal - 8764044 - Berwick, LA 29 mi56 min WSW 2.9 G 5.1 44°F 45°F1017.4 hPa
AMRL1 - 8764227 - Amerada Pass, LA 34 mi56 min WSW 5.1 G 8.9 47°F 47°F1017.5 hPa
EINL1 38 mi56 min WSW 14 G 15 49°F 46°F1017.3 hPa36°F
CARL1 39 mi56 min 44°F
FREL1 39 mi56 min WSW 2.9 G 5.1 44°F 1014.9 hPa
NWCL1 - 8761927 - New Canal, LA 44 mi56 min W 9.9 G 14 47°F 51°F1015.2 hPa
GISL1 - 8761724 - Grand Isle, LA 45 mi56 min 14 G 17 54°F

Wind History for West Bank 1, Bayou Gauche, LA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Houma-Terrebonne Airport, LA3 mi19 minW 57.00 miFair40°F31°F70%1017.3 hPa

Link to 5 minute data for KHUM

Wind History from HUM (wind in knots)
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Last 24hrN7N6N5NW3CalmNW7--NW6NW12
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1 day agoCalmCalmCalmCalmCalmCalmCalmS5SW8SW10SW11
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------------SW5SW6SW5W7NW10NW12
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2 days agoE4CalmCalmCalmCalmCalmCalmCalmN4N4NW6W4W4W5SW4W7W9--W3CalmCalmCalmCalmCalm

Tide / Current Tables for Cocodrie, Terrebonne Bay, Louisiana
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Cocodrie
Click for Map
Sat -- 12:32 AM CST     1.17 feet High Tide
Sat -- 06:57 AM CST     Sunrise
Sat -- 09:38 AM CST     Moonrise
Sat -- 12:09 PM CST     -0.01 feet Low Tide
Sat -- 05:27 PM CST     Sunset
Sat -- 09:05 PM CST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.21.21.110.90.80.60.50.30.20.10-000.10.20.30.40.60.70.80.90.91

Tide / Current Tables for Shell Island, Louisiana
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Shell Island
Click for Map
Sat -- 05:16 AM CST     0.90 feet High Tide
Sat -- 07:00 AM CST     Sunrise
Sat -- 09:41 AM CST     Moonrise
Sat -- 11:41 AM CST     -0.59 feet Low Tide
Sat -- 05:29 PM CST     Sunset
Sat -- 09:08 PM CST     Moonset
Sat -- 09:09 PM CST     0.92 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.80.80.80.90.90.90.90.70.40-0.3-0.5-0.6-0.5-0.4-0.20.10.30.60.80.90.90.90.7

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station



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 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.