Thursday, December12, 2019
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Marine Weather and Tides
Lahaina, HI

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:52AMSunset 5:47PM Thursday December 12, 2019 11:22 AM HST (21:22 UTC) Moonrise 6:36PMMoonset 7:23AM Illumination 99% 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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PHZ119 Maalaea Bay- 1005 Am Hst Thu Dec 12 2019
.small craft advisory in effect from this evening through early Saturday morning...
Rest of today..Winds variable less than 10 knots becoming east 10 knots in the afternoon. Wind waves 2 feet or less.
Tonight..Northeast winds 10 knots. Wind waves 2 feet or less.
Friday..Northeast winds 20 knots. Wind waves 2 feet or less then 3 feet in the afternoon. Isolated showers through the day.
Friday night..Northeast winds 20 knots. Wind waves 3 feet. Scattered showers.
Saturday..Northeast winds 15 knots. Wind waves 3 feet.
Saturday night..Northeast winds 15 knots. Wind waves 3 feet.
Sunday..Northeast winds 15 knots. Wind waves 3 feet. Isolated showers.
Monday..Northeast winds 15 knots. Wind waves 3 feet.
PHZ100 1005 Am Hst Thu Dec 12 2019
Synopsis for hawaiian coastal waters.. A front is moving southeast over the far northwest offshore waters this morning. This front will stall just nw of kauai tonight and dissipate Friday. A strong surface high will pass north of the islands tonight into Friday, driving a boost in trade wind speeds. A large northwest swell will peak this morning then slowly subside through Saturday.


7 Day Forecast for Marine Location Near Lahaina, HI
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location: 20.88, -156.68     debug


Area Discussion for -
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FXHW60 PHFO 122000 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 1000 AM HST Thu Dec 12 2019

SYNOPSIS. Light trade winds and a few windward showers will prevail over most islands today. Strong high pressure passing north of the islands will bring increasing trade winds tonight and Friday, with locally breezy trades persisting into Saturday. The strengthening trade winds will bring passing clouds and showers to windward areas, but a front stalling just northwest of the islands will bring increased rainfall to Kauai later today through Friday. High clouds are expected to pass over the islands late tonight through Saturday.

DISCUSSION. One last day of light trade winds is in store for most of the state. A stalled front located roughly 50 miles northwest of Kauai bisects pair of surface highs centered about 1800 east- northeast and 1200 northwest of the state. As a result, the pressure gradient over the islands remains rather weak and is driving gentle to locally moderate easterly trade winds. As the high to the northwest advances eastward, we could see stronger northeasterly trade winds building around Kauai this afternoon, with little change elsewhere. Modest shower activity will persist along windward slopes from the Big Island to Oahu, while nearby moisture from the front may fuel additional showers on Kauai. An upper level trough digging toward the state is triggering heavy showers and thunderstorms along the front this morning, and while it is not out of the question that a heavy shower could develop on Kauai this afternoon, chances remain low at this time.

Trades will ramp up considerably tonight and Friday as high clouds thicken. The somewhat strong surface high currently sitting northwest of the state will pass by to the north, as the front stalled just northwest of Kauai begins to fall apart. Expect stronger trades to initially build around Kauai tonight, then state-wide on Friday as the front further erodes. Enhanced moisture will continue to be pooled just north of Kauai, while the upper level trough moves overhead. The greatest instability and potential for heavy showers and thunderstorms will remain north and west of Kauai, but we will monitor closely. Elsewhere, a typical pattern of windward rainfall will prevail, with a few showers blowing over to leeward areas. The approaching upper level trough will also tap high level moisture and spread thickening high clouds over the islands.

Breezy trades will slowly subside during the weekend as high clouds thin. The surface high will move off to the northeast, and its trailing ridge north of the islands will be weakened, allowing trades to back off to moderate strength by Sunday. The upper level over the state will creep eastward and slowly fill as a mid level ridge strengthens. As a result, expect an increasingly stable pattern of mainly windward showers and decreasing high clouds.

Another shot of stronger trades is due Monday and Tuesday as another high pass north of the state. A ridge aloft will strengthen, maintaining a rather stable weather pattern with showers remaining focused on windward slopes.

AVIATION. East or northeast moderate trades will persist today as a weak front remains stalled to the northwest of Kauai. Thus, scattered showers will mainly affect windward locations of all islands. As moisture from the front approaches the state this evening, expect precipitation coverage to increase over Kauai. MVFR conditions may develop with periods of mountain obscuration.

No AIRMETs are in effect at this time.

MARINE. A large northwest swell will maintain surf above warning levels through tonight. A High Surf Warning is in effect for north and west facing shores of Niihau, Kauai, Oahu, and Molokai as well as for north facing shores of Maui. A High Surf Advisory is in effect for the leeward Big Island coast. The surf is currently peaking this morning and will slowly subside into Saturday. Another northwest swell may produce advisory level surf early next week.

A full moon high tide earlier this morning and the large NW swell has brought some overwash along coastal areas. We have received reports of water overwashing onto Kamehameha highway near Laniakea early this morning. With the tides much lower this afternoon and the swell slowly subsiding, we should see less coastal overwash by this afternoon.

A front moving SE over the NW offshore waters will stall tonight NW of Kauai. A new high will pass north of Kauai tonight and Friday, driving a boost in northeast winds to near gale force north of the front. Waters around Kauai will see the strongest winds tonight and Friday. Strong trades will also develop over the typically windy coastal waters Friday. As the high continues eastward, trades will weaken over the western end of the island chain by Saturday, but the locally strong trades over the eastern waters will continue through the weekend and into next week.

Surf along east facing shores is currently below the seasonal average. A boost in the trades later today and Friday will lead to higher surf along east facing shores of all islands, but especially for Kauai where a High Surf Advisory may be needed for east facing shores. Some increase in surf is also expected from a northeast swell entering Hawaiian waters Friday and Saturday. The trade swell will gradually ease this weekend. Due to the large northwest swell, a Small Craft Advisory is in effect for all windward waters as well as the leeward waters of Kauai and Oahu, including the Kaiwi Channel through today. Starting tonight, trade winds will strengthen and will cause winds to reach advisory levels for the typical windy areas around Maui County and the Big Island. Strong northeast winds will also strengthen around Kauai County tonight into Friday. A Small Craft Advisory has been posted for all Hawaiian Waters except Maui County Leeward starting tonight and continuing through early Saturday morning due to the return of strong trades and the large northwest swell.

HFO WATCHES/WARNINGS/ADVISORIES. High Surf Warning until 6 AM HST Friday for north and west facing shores of Niihau, Kauai, Oahu, and Molokai, and for north facing shores of Maui.

High Surf Advisory until 6 AM HST Friday for Kona.

Small Craft Advisory until 6 AM HST Saturday for all waters except Maui County Leeward.



DISCUSSION . Wroe AVIATION . Thomas MARINE . Kino


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 11 mi58 min NNW 6 G 7 78°F 1018.2 hPa
51205 17 mi52 min 80°F16 ft
51213 19 mi52 min 82°F4 ft
51202 - Mokapu Point, HI (098) 65 mi52 min 80°F6 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lahaina - West Maui, HI10 mi37 minVar 515.00 miA Few Clouds82°F69°F66%1018.3 hPa
Kahului, Kahului Airport, HI13 mi88 minN 510.00 miA Few Clouds with Haze82°F66°F60%1018.7 hPa
Lanai City, Lanai Airport, HI16 mi86 minVar 410.00 miA Few Clouds77°F70°F79%1018.5 hPa

Link to 5 minute data for PHJH

Wind History from HJH (wind in knots)
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Last 24hrN94SW95N844------------------------E85CalmNW85
1 day ago6NE10NE85NE1054------------------------SE84544
2 days ago6SW6W5W5------------------------------SE95Calm54

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Thu -- 03:49 AM HST     2.58 feet High Tide
Thu -- 06:53 AM HST     Sunrise
Thu -- 07:23 AM HST     Moonset
Thu -- 10:58 AM HST     0.40 feet Low Tide
Thu -- 03:26 PM HST     0.97 feet High Tide
Thu -- 05:46 PM HST     Sunset
Thu -- 06:36 PM HST     Moonrise
Thu -- 08:51 PM HST     -0.00 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.21.82.22.52.62.42.11.61.10.70.50.40.50.70.810.90.80.60.30.1-00.10.4

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Thu -- 03:04 AM HST     2.81 feet High Tide
Thu -- 06:52 AM HST     Sunrise
Thu -- 07:22 AM HST     Moonset
Thu -- 09:30 AM HST     0.95 feet Low Tide
Thu -- 01:42 PM HST     1.49 feet High Tide
Thu -- 05:46 PM HST     Sunset
Thu -- 06:35 PM HST     Moonrise
Thu -- 08:14 PM HST     -0.44 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.62.22.62.82.72.41.91.51.2111.11.31.51.51.310.60.1-0.2-0.4-0.4-00.5

Weather Map
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wmap_P
GEOS Local Image of Hawaii    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
Wind Forecast for (16,3,4,5)
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Ground Weather Radar Station Molokai, HI
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weather_mapweather_map weather_map

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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 numerious 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.