Thursday, August22, 2019 L-36.com


Marine Weather and Tides
Lahaina, HI

Version 3.4
NOTICE
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 6:06AMSunset 6:51PM Thursday August 22, 2019 4:03 PM HST (02:03 UTC) Moonrise 11:41PMMoonset 12:04PM Illumination 50% Phase: Third Quarter Moon; Moon at 22 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- 320 Pm Hst Thu Aug 22 2019
.small craft advisory in effect through Friday afternoon...
Tonight..North winds to 25 knots. Wind waves 3 feet.
Friday..North winds to 25 knots. Wind waves 3 feet in the morning then 2 feet or less.
Friday night..North winds 20 knots. Wind waves 2 feet or less.
Saturday..North winds to 25 knots. Wind waves 2 feet or less then 3 feet in the afternoon.
Saturday night..North winds to 25 knots. Wind waves 3 feet.
Sunday..North winds to 25 knots. Wind waves 3 feet.
Sunday night..North winds to 25 knots. Wind waves 3 feet.
Monday..North winds 20 knots. Wind waves 3 feet.
Tuesday..North winds 15 knots. Wind waves 3 feet.
PHZ100 320 Pm Hst Thu Aug 22 2019
Synopsis for hawaiian coastal waters.. High pressure north of the state will maintain moderate to locally strong trade winds through Friday, then briefly decrease Friday night as a trough nears the state. High pressure will restrengthen northeast of the area 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 230139
afdhfo
area forecast discussion
national weather service honolulu hi
339 pm hst Thu aug 22 2019

Synopsis
Expect a typical trade wind weather pattern through the weekend,
with clouds and showers favoring windward and mauka areas. Warm
and humid conditions are forecast Tuesday through midweek as
wind speeds trend down into the light and variable range.

Discussion
An upper low and a dissipating surface trough north through
northeast of the islands puts a dent in the subtropical ridge.

That said, locally breezy trade winds continue across local waters
this afternoon. Satellite loop shows clouds focusing across
windward and mauka areas of the islands, with rather sparse cloud
cover upwind from the islands. Radar shows isolated to scattered
light showers, mainly across windward areas.

Models show trade winds will remain locally breezy as the upper
low and dissipating surface trough pass westward and the ridge
rebuilds. The current weather pattern will prevail with clouds
and showers favoring windward and mauka areas. An increase in
shower coverage is possible late Saturday into Sunday as a pocket
of higher moisture moves through from east to west.

After the weekend, models show a weakness developing within the
ridge as a broad upper trough and surface front pass to the north.

The pressure gradient will weaken over the state, possibly
allowing a land and sea breeze regime to develop Tuesday through
midweek. If this scenario evolves, clouds and showers will favor
interior areas through the afternoon and evening hours.

Aviation
A ridge N of the area will maintain locally strong E flow over
the main hawaiian islands through tomorrow.

Vfr conditions will prevail through the night, but isol MVFR
ceilings or visibilities are possible over E sections of the
islands. Satellite loops show an area of showery low clouds a few
hundred miles east of the big island of hawaii moving W toward
the islands. This cloud area may produce more widespread MVFR
conditions when it reaches the islands tomorrow, especially over
the E side of the big island.

Marine
High pressure to the north will maintain mostly fresh trades
through Friday. Thus, the small craft advisory (sca) has been
extended through Friday for the typically windy waters around maui
and the big island. A trough approaching from the north will
briefly ease the trade winds Friday night to below SCA levels. A
new high building northeast of the islands will then strengthen
winds back to moderate and locally strong levels over the weekend,
with scas likely being required once again for the windier marine
zones.

A south swell will continue to decline through Friday. A series
of small long-period south and southwest swells will maintain
average surf along south shores Sunday through early next week. A
larger southwest swell may arrive Tuesday and remain through the
week.

Small northwest swells will linger over the next few days
providing some out of season surf along north facing shores.

Breezy trades will continue to produce small choppy surf along
east facing shores over the next few days. An increase in wind
swell is expected late in the weekend as trades strengthen locally
and upstream of the state.

Hfo watches warnings advisories
Small craft advisory until 6 pm hst Friday for maalaea bay-
pailolo channel-alenuihaha channel-big island leeward waters-big
island southeast waters.

Discussion... Powell
aviation... Donaldson
marine... Morrison


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 11 mi52 min N 16 G 19 81°F 1014.5 hPa
51213 19 mi64 min 85°F3 ft
51202 - Mokapu Point, HI (098) 65 mi34 min 82°F5 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 mi79 minNNE 11 G 2015.00 miA Few Clouds90°F68°F49%1014.6 hPa
Kahului, Kahului Airport, HI13 mi2.2 hrsNNE 2210.00 miA Few Clouds and Breezy89°F71°F55%1015.2 hPa
Lanai City, Lanai Airport, HI16 mi2.1 hrsNE 22 G 2710.00 miFair and Breezy83°F71°F67%1013.5 hPa

Link to 5 minute data for PHJH

Wind History from HJH (wind in knots)
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Last 24hr----------------------------NE13NE11
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1 day ago----------------------------NE11--NE14NE15
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2 days agoNE12--------------------------E5
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--NE14NE16
G25
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NE17--

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Thu -- 01:36 AM HST     0.47 feet Low Tide
Thu -- 06:07 AM HST     Sunrise
Thu -- 09:05 AM HST     1.75 feet High Tide
Thu -- 12:04 PM HST     Moonset
Thu -- 03:30 PM HST     1.00 feet Low Tide
Thu -- 06:51 PM HST     Sunset
Thu -- 07:45 PM HST     1.28 feet High Tide
Thu -- 11:41 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.50.50.60.811.31.51.71.81.71.61.41.21.1111.11.21.31.31.21.10.9

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Thu -- 12:16 AM HST     0.52 feet Low Tide
Thu -- 06:06 AM HST     Sunrise
Thu -- 07:29 AM HST     1.60 feet High Tide
Thu -- 12:03 PM HST     Moonset
Thu -- 12:13 PM HST     1.34 feet Low Tide
Thu -- 05:18 PM HST     1.64 feet High Tide
Thu -- 06:50 PM HST     Sunset
Thu -- 11:40 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.60.70.91.11.41.51.61.61.51.41.41.31.41.41.51.61.61.61.51.41.20.90.7

Weather Map and Satellite Images
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wmap_P
GOES 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 (22,6,7,8)
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Ground Weather Radar Station Molokai, HI
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weather_mapweather_map weather_map

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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 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.