Monday, December9, 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 6:50AMSunset 5:46PM Monday December 9, 2019 3:42 PM HST (01:42 UTC) Moonrise 4:13PMMoonset 4:33AM Illumination 96% Phase: Waxing Gibbous; Moon at 13 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- 316 Pm Hst Mon Dec 9 2019
Tonight..North winds 15 knots. Wind waves 2 feet or less.
Tuesday..North winds 15 knots. Wind waves 2 feet or less.
Tuesday night..North winds 15 knots. Wind waves 2 feet or less.
Wednesday..Northeast winds 10 knots. Wind waves 2 feet or less. Isolated showers in the afternoon.
Wednesday night..Northeast winds 20 knots. Wind waves 2 feet or less. Isolated showers after midnight.
Thursday..Northeast winds 20 knots. Wind waves 2 feet or less. Isolated showers.
Thursday night..Northeast winds 20 knots. Wind waves 2 feet or less. Scattered showers after midnight.
Friday..Northeast winds to 25 knots. Wind waves 2 feet or less. Scattered showers.
Saturday..Northeast winds 20 knots. Wind waves 2 feet or less. Scattered showers.
PHZ100 316 Pm Hst Mon Dec 9 2019
Synopsis for hawaiian coastal waters.. A weak front just northwest of kauai will move slowly north as a ridge builds over the area from the east. A new front will approach from the northwest by mid-week with a strong high building behind it.


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 091951 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 951 AM HST Mon Dec 9 2019

SYNOPSIS. A stalled front north of the state will maintain light easterly winds through the first half of the week. Mostly dry and stable weather will prevail with a few clouds and showers setting up over interior areas each afternoon due to sea breezes. Increasing moisture associated with a second front will bring increasing showers Thursday and gusty northeast winds by Friday.

DISCUSSION. A stalled front just north of Kauai will weaken in place over the next few days bringing benign weather and light easterly trade winds to the islands through midweek. Sea breezes are expected along leeward coastlines, and interior and mountain locations will see afternoon clouds and limited light showers.

Stable conditions aloft are keeping cloud tops limited to around 8 thousand feet and any showers that do form over the islands have been short-lived. A weak trough to our south has increased shower activity over the coastal waters south of the Big Island, and a low level convergence area has created a thin line of showers over the Kauai Channel. Otherwise, skies over the islands this morning are mostly clear. Expect increasing cloudiness this afternoon over interior areas and over the mountains as daytime heating creates some upward motion and leeward sea breezes kick in. Expect similar conditions through Wednesday.

Thursday, synoptic weather conditions begin to change as a second, more robust cold front approaches from the northwest, and an upper level trough brings colder temperatures aloft that will trigger increasing shower coverage and rainfall intensity. Showers are expected to increase over Kauai Thursday evening and then the rest of the state Thursday night. The front will also bring strong gusty northeast winds Thursday night and Friday. However, the GFS and ECMWF global models are having quite a hard time coming into agreement with the details of the front and upper trough at this time. Historically, similar weather patterns have brought the lion's share of rain to Kauai, with the rest of the state seeing frequent windward showers and passing leeward rainfall. The forecast will continue to be updated as the model solutions converge.

Saturday, the front is forecast to retreat to the north and dissipate while the upper trough weakens and the atmosphere becomes more stable. Trade winds are expected to drop to moderate levels while shower coverage decreases and focus over windward and mountain areas.

AVIATION. VFR conditions prevail at all the TAF sites and these conditions are expected to prevail through the day on into the evening hours. Elsewhere Vfr conditions prevail across the remainder of the state. Some local MVFR conditions may occur during the afternoon and evening hours over mountainous terrain as daytime heating allows for some cloud buildups and isolated -shra.

MARINE. There are no warnings or advisories in effect for the Hawaiian coastal or offshore waters today. A ridge north of the area will maintain light to moderate winds over the area through tomorrow night. Winds will strengthen starting Wednesday as a front moves over the area from the northwest and a strong high builds in behind it.

A new northwest swell is beginning to fill in and will spread down the island chain today. This swell is forecast to produce surf above the advisory threshold along north and west facing shores starting this evening and holding through Wednesday morning. As this swell subsides Wednesday, a much larger northwest swell is expected to produce surf well above warning levels along north and west facing shores of the smaller islands beginning Wednesday night into Friday. This swell may also be large enough to produce advisory level surf along west facing shores of the Big Island. The swell is expected to gradually subside through Friday night.

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . Morrison AVIATION . Burke MARINE . TS


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51205 17 mi43 min 79°F6 ft
51213 19 mi43 min 81°F3 ft
51202 - Mokapu Point, HI (098) 65 mi43 min 81°F4 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 mi53 minW 515.00 miA Few Clouds82°F68°F62%1012.5 hPa
Kahului, Kahului Airport, HI13 mi49 minN 1110.00 miA Few Clouds84°F68°F59%1012.5 hPa
Lanai City, Lanai Airport, HI16 mi47 minVar 610.00 miFair76°F66°F74%1014.9 hPa

Link to 5 minute data for PHJH

Wind History from HJH (wind in knots)
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Last 24hrN10N10NE18------------------------4NE735NE126SW6W5W5
1 day agoN8----------------------------SE6E6CalmCalmCalmNW5N6NW7N10
2 days agoNE15NE15NE12------------------------E8E5CalmCalmCalmS7W5W5N7

Tide / Current Tables for Lahaina, Maui Island, Hawaii
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Lahaina
Click for Map
Mon -- 02:03 AM HST     2.19 feet High Tide
Mon -- 04:33 AM HST     Moonset
Mon -- 06:51 AM HST     Sunrise
Mon -- 08:39 AM HST     0.61 feet Low Tide
Mon -- 01:20 PM HST     1.21 feet High Tide
Mon -- 04:13 PM HST     Moonrise
Mon -- 05:46 PM HST     Sunset
Mon -- 07:13 PM HST     0.04 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.82.12.22.11.81.51.10.80.60.60.70.91.11.21.210.80.40.200.10.30.71.2

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Mon -- 01:24 AM HST     2.35 feet High Tide
Mon -- 04:32 AM HST     Moonset
Mon -- 06:51 AM HST     Sunrise
Mon -- 07:25 AM HST     1.02 feet Low Tide
Mon -- 12:07 PM HST     1.68 feet High Tide
Mon -- 04:12 PM HST     Moonrise
Mon -- 05:45 PM HST     Sunset
Mon -- 06:41 PM HST     -0.17 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.12.32.32.11.81.51.2111.21.41.61.71.61.410.60.1-0.1-0.200.511.6

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 (20,4,5,8)
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Ground Weather Radar Station Molokai, HI
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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.