Tuesday, July14, 2020
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Marine Weather and Tides
Lahaina, HI

Version 3.4
NOTICE
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 5:51AMSunset 7:11PM Monday July 13, 2020 7:24 PM HST (05:24 UTC) Moonrise 12:36AMMoonset 1:19PM Illumination 37% Phase: Third Quarter Moon; Moon at 23 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- 333 Pm Hst Mon Jul 13 2020
Tonight..North winds 20 knots becoming northeast 10 knots after midnight. Wind waves 2 feet or less.
Tuesday..Winds variable less than 10 knots. Wind waves 2 feet or less.
Tuesday night..North winds 20 knots. Wind waves 2 feet or less.
Wednesday..North winds 20 knots. Wind waves 2 feet or less. Isolated showers in the afternoon.
Wednesday night..North winds 15 knots. Wind waves 2 feet or less.
Thursday..North winds 20 knots. Wind waves 2 feet or less.
Thursday night..North winds 15 knots. Wind waves 2 feet or less.
Friday..Northeast winds 10 knots. Wind waves 2 feet or less. Isolated showers.
Saturday..Northeast winds 15 knots becoming north to 25 knots. Wind waves 3 feet.
PHZ100 333 Pm Hst Mon Jul 13 2020
Synopsis for hawaiian coastal waters.. High pressure north-northeast of the area will keep moderate to locally fresh trade winds in place through the middle of the week. A weak disturbance passing north and northeast of the state will weaken the trades slightly towards the end of the week. Locally strong trades are expected to return over the weekend.


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 140145 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 345 PM HST Mon Jul 13 2020

SYNOPSIS. Trade wind speeds will fluctuate somewhat Tuesday and Wednesday, but likely remain locally gusty in the afternoons. Winds will weaken later Wednesday, then remain on the lighter side for several days before strengthening by Sunday. The trade winds will deliver periods of clouds and showers that will primarily favor windward areas during nights and mornings, but the lighter winds will allow some afternoon clouds and showers to develop over leeward areas.

DISCUSSION. Trade wind speeds will fluctuate between moderate to locally breezy Tuesday and Wednesday, then trend toward the lighter end of the spectrum from Thursday into Saturday, with wind speeds then increasing by Sunday.

Latest guidance supports much of the ongoing forecast philosophy, with some slight changes through the short term. These include the overnight arrival of a showery cloud area that will fuel an increase in windward showers through tomorrow morning, and a slower trend toward weaker winds. While these are not especially impactful forecast trends, they "cloud" the picture as to the extent of afternoon leeward convection that can be expected on the smaller islands the next 2 days.

Although trade winds are expected to diminish slightly tonight into Tuesday, forecast models now indicate a slight increase in wind speeds later Tuesday into Wednesday. Winds will diminish and veer toward the ESE later Wednesday into the weekend, even though a surface high pressure cell far NE of the islands will move/change very little. Instead, the decrease in winds will be due to weak low- level features passing between the islands and the high, acting to loosen the low-level pressure gradient.

A weak low-level trough to the N of the islands (associated with a low aloft) will move W and sharpen to the NW of the islands from Tuesday into Thursday. A band of showery low clouds that appears to be loosely related to this feature will traverse the islands tonight through early Tuesday, bringing windward showers. Additionally, a trough marking the remnant of TS Cristina will move between the islands and the high later in the week, while a front will dig toward the islands from the NW. These features will act to keep the flow over the islands veered and diminished for the second half of the week.

The lighter winds will allow afternoon leeward sea breezes to drive cloud and shower formation over leeward areas that will diminish after sunset. Warming mid-level temperatures are expected as the low aloft to the N moves W the next couple of days, with a stabilizing mid-level ridge prevailing into the weekend. Shower coverage and intensity should be limited as a result, especially since most of the moisture associated with the remnants of Cristina will pass N of the islands. As the low aloft moves to a position NW of Kauai, it will continue to deliver some periods of high clouds. Latest guidance has the bulk of the high clouds over Kauai and Oahu, potentially becoming thick at times from Tuesday into Thursday.

AVIATION. A high pressure system far to the north northeast will drive moderate to fresh trade winds across the state through at least Tuesday. Passing clouds and showers will impact mainly windward portions Kauai this evening with brief mountain obscurations possible. Incoming showers expected to move in across the other islands later tonight. Mountain obscurations, occasional MVFR ceilings and visibility are expected around these showers. AIRMET Sierra will be likely for some windward sections later tonight as the showers fill in.

AIRMET TANGO remains in effect below 8000 feet for south through west of mountains on all islands for tempo moderate turbulence due to trade wind speeds.

MARINE. High pressure far north-northeast of the islands will maintain moderate to locally fresh trades through the middle of the week. A slight decrease of trade winds is expected tonight, so the Small Craft Advisory (SCA) for the windier waters around Maui County and the Big Island has been cancelled. A slight increase of trades Tuesday afternoon may bring a brief return of SCA winds for these areas. A weak disturbance passing north and northeast of the area Thursday and Friday should weaken the trade winds down to light to moderate speeds by Friday. Trades should then ramp back up to locally strong levels next weekend as high pressure strengthens far to the north of the island chain.

Overall, no significant swells are expected through the forecast period. Small background surf will continue along south facing shores over the next several days. A small south-southwest swell is possible over the weekend. East facing shores will continue to experience small short period surf produced by the trade winds locally and upstream of the state. An increase is expected over the weekend as the breezy trade winds return. Surf along north facing shores will remain nearly flat through the period.

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . Birchard AVIATION . Foster MARINE . Kino


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 11 mi55 min 80°F
51205 17 mi59 min 79°F5 ft
51213 19 mi29 min 82°F3 ft
51202 - Mokapu Point, HI (098) 65 mi29 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 mi1.7 hrsNE 1715.00 miA Few Clouds81°F64°F58%1013.9 hPa
Kahului, Kahului Airport, HI13 mi31 minENE 16 G 2310.00 miPartly Cloudy81°F66°F61%1014.4 hPa
Lanai City, Lanai Airport, HI16 mi29 minNE 13 G 1710.00 miFair73°F71°F94%1014 hPa

Link to 5 minute data for PHJH

Wind History from HJH (wind in knots)
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Last 24hr------------------------NE8NE12--E8NE10
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1 day ago------------------------------------------------
2 days ago------------------------------------------------

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Tue -- 01:10 AM HST     Moonrise
Tue -- 04:27 AM HST     0.23 feet Low Tide
Tue -- 05:54 AM HST     Sunrise
Tue -- 12:09 PM HST     1.81 feet High Tide
Tue -- 02:08 PM HST     Moonset
Tue -- 06:52 PM HST     0.83 feet Low Tide
Tue -- 07:11 PM HST     Sunset
Tue -- 10:38 PM HST     1.09 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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10.80.60.40.20.30.40.60.91.21.51.71.81.81.61.41.210.90.80.911.11.1

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Tue -- 01:09 AM HST     Moonrise
Tue -- 03:52 AM HST     0.37 feet Low Tide
Tue -- 05:53 AM HST     Sunrise
Tue -- 11:55 AM HST     1.76 feet High Tide
Tue -- 02:07 PM HST     Moonset
Tue -- 05:42 PM HST     1.36 feet Low Tide
Tue -- 07:10 PM HST     Sunset
Tue -- 08:41 PM HST     1.43 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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10.80.60.40.40.40.60.91.11.41.61.71.81.71.61.51.41.41.41.41.41.41.41.3

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 (1,6,7,8)
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Ground Weather Radar Station Molokai, HI
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Disclaimer:
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.