Wednesday, October16, 2019 L-36.com


Marine Weather and Tides
Kapalua, 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 6:20AMSunset 6:02PM Wednesday October 16, 2019 12:21 PM HST (22:21 UTC) Moonrise 8:20PMMoonset 8:49AM Illumination 89% Phase: Waning Gibbous; Moon at 18 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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PHZ120 Pailolo Channel- 921 Am Hst Wed Oct 16 2019
.small craft advisory in effect through early Thursday morning...
Rest of today..East winds to 25 knots. Wind waves 5 feet. SWell south 3 feet. Isolated showers late in the morning. Scattered showers in the afternoon.
Tonight..East winds to 25 knots. Wind waves 5 feet. SWell northeast 3 feet. Scattered showers.
Thursday..East winds 20 knots. Wind waves 5 feet. SWell northeast 4 feet. Isolated showers.
Thursday night..East winds to 25 knots. Wind waves 5 feet. SWell northeast 4 feet. Isolated showers.
Friday..East winds to 25 knots. Wind waves 5 feet. SWell northeast 3 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Friday night..East winds to 25 knots. Wind waves 5 feet. SWell northeast 3 feet increasing to northwest 4 feet and south 3 feet after midnight. Isolated showers in the evening. Scattered showers after midnight.
Saturday..East winds 20 knots. Wind waves 6 to 7 feet. North swell 3 to 4 feet. Isolated showers.
Sunday..East winds 20 knots. Wind waves 4 to 5 feet. Northwest swell 3 feet. Isolated showers.
PHZ100 921 Am Hst Wed Oct 16 2019
Synopsis for hawaiian coastal waters.. A high north of the area will maintain locally strong easterly trades through at least tonight. A low aloft and a remnant front will bring a slight chance of Thunderstorms through tonight. Showers will subside and strong trade winds become more widespread starting Thursday night as the low moves away.


7 Day Forecast for Marine Location Near Kapalua CDP, HI
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location: 21.02, -156.64     debug


Area Discussion for -
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Fxhw60 phfo 161913
afdhfo
area forecast discussion
national weather service honolulu hi
913 am hst Wed oct 16 2019

Synopsis
A dissipating front approaching from the north, combined with a
developing upper trough, will support increased rainfall coverage
across the western half of the state today and tonight. Thunderstorms
and heavy rain will be possible mainly over kauai and oahu. Drier
trade wind weather will return Thursday and remain into Saturday.

Increasing humidity and showers are possible Saturday night and
Sunday.

Discussion
Water vapor imagery shows a nearly stationary upper low centered
over kauai and oahu this morning and will destabilize the atmosphere
through early Thursday morning before shifting west of the state
Thursday. At the low levels, a 1029 mb high is centered far north
of the islands and driving moderate to fresh trade winds across
the area. Infrared satellite shows a weak front with associated
clouds and showers caught in the trade wind flow moving across
kauai and oahu this morning. Goes-17 total precipitable water (pw)
shows above normal values of 1.9 inches along the front moving
onto kauai and oahu. The combination of moisture and instability
will likely trigger heavy passing showers and a slight chance for
thunderstorms over the western half of the state through tonight,
and possibly into Thursday morning for kauai. The trades will
focus rainfall windward, however, all areas of both kauai and oahu
can expect wet conditions over the next 24 hours. A flash flood
watch is posted for niihau, kauai and oahu from noon today through
tonight. Please see ffahfo product on our website for more
information. Showers will also increase (to a lesser extent)
across windward sides of molokai, maui and the big island today,
as well as the typical shower buildups over the kona slopes.

Tonight, the upper low will induce a weak surface trough west of
kauai allowing winds to veer slightly south of east, however, wind
speeds will maintain moderate to fresh strength. By Thursday
morning the moisture from the front is expected to push west of
the state, along with the upper level low, likely alleviating the
threat of widespread heavy rain. Trade winds will carry in drier
and more stable conditions, with some windward and mauka showers,
but fewer showers overall.

On Saturday, a weakening front over the northwest hawaiian islands
will push the high pressure generating our trades far enough east
to shift the trade winds from the east-southeast. This slight shift
in wind direction may be enough to allow some tropical moisture
to flow over the eastern half of the state Saturday afternoon and
Sunday. This would increase humidity and trade wind showers mainly
for the big island and maui county. The upper level forecast
shows a stable atmosphere remaining overhead, so widespread heavy
showers are not expected at this time.

Aviation
The combination of an upper level low over the western end of
hawaii and moisture from a weak front will bring the potential for
widespread showers and a slight chance for thunderstorms over the
western end of the state. Airmet sierra is posted for ifr
conditions over kauai and for tempo mountain obscurations over
oahu. Brief mountain obscurations will be possible for windward
sides of molokai, maui and big island as showers increase in these
areas today. Light icing may occur within some of the heavier
showers or thunderstorms this afternoon and tonight.

Marine
Strong high pressure north of the area will maintain moderate to
locally strong easterly trade winds over the coastal waters
through at least tonight, but likely continue through the rest of
this week. A small craft advisory remains in effect for maalaea
bay and the pailolo and alenuihaha channels through tonight, but
may need to be extended. A weak front between the high and the
main hawaiian islands is keeping the winds from being stronger
than they otherwise would be.

A low aloft and remnants of the front will provide a slight chance
of thunderstorms through tonight, mainly around kauai and oahu. The
low is forecast to move away beginning Thursday night, allowing
showers to subside and winds to become stronger and more widespread.

Winds may slightly weaken again on Sunday as a new front passing
northwest of the state weakens the pressure gradient.

Surf is expected to remain below advisory levels along all shores
through early next week. A series of northwest, north, and south
swells will produce small surf through early next week. Surf along
east facing shores will trend up toward the end of the week as
the trades strengthen.

Hfo watches warnings advisories
Flash flood watch from noon hst today through late tonight for
niihau-kauai-oahu.

Small craft advisory until 6 am hst Thursday for maalaea bay-
pailolo channel-alenuihaha channel.

Discussion... Foster
aviation... Dye
marine... Ts


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51205 11 mi52 min 82°F5 ft
KLIH1 - 1615680 - Kahului Bay, Maui, HI 13 mi52 min NNE 16 G 21 81°F 1016.1 hPa
51213 27 mi52 min 83°F2 ft
51202 - Mokapu Point, HI (098) 61 mi52 min 82°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, HI1 mi37 minNE 10 G 2110.00 miA Few Clouds86°F64°F49%1015.9 hPa
Kahului, Kahului Airport, HI14 mi28 minENE 15 G 2410.00 miPartly Cloudy89°F64°F43%1015.8 hPa
Lanai City, Lanai Airport, HI23 mi26 minVar 610.00 miOvercast78°F70°F76%1015.6 hPa

Link to 5 minute data for PHJH

Wind History from HJH (wind in knots)
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Last 24hrNE16NE13
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1 day agoE15
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NE15NE12NE9------------------------2N12N10NE11
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2 days agoNE14E11NE13NE14NE10NE12------------------------NE10
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Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Wed -- 04:59 AM HST     2.20 feet High Tide
Wed -- 06:22 AM HST     Sunrise
Wed -- 08:49 AM HST     Moonset
Wed -- 11:38 AM HST     0.65 feet Low Tide
Wed -- 04:39 PM HST     1.31 feet High Tide
Wed -- 06:01 PM HST     Sunset
Wed -- 08:20 PM HST     Moonrise
Wed -- 10:22 PM HST     0.34 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.711.51.82.12.22.11.81.51.10.80.70.70.811.11.31.31.210.70.50.40.4

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Wed -- 03:52 AM HST     2.42 feet High Tide
Wed -- 06:21 AM HST     Sunrise
Wed -- 08:48 AM HST     Moonset
Wed -- 09:56 AM HST     0.92 feet Low Tide
Wed -- 02:59 PM HST     1.79 feet High Tide
Wed -- 06:00 PM HST     Sunset
Wed -- 08:19 PM HST     Moonrise
Wed -- 09:25 PM HST     0.05 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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11.522.32.42.321.61.210.911.21.51.71.81.71.410.60.30.10.10.3

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 (18,4,5,8)
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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 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.