Thursday, July18, 2019 L-36.com


Marine Weather and Tides
Kapalua, HI

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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 5:53AMSunset 7:10PM Thursday July 18, 2019 5:52 PM HST (03:52 UTC) Moonrise 8:51PMMoonset 7:29AM Illumination 96% Phase: Waning Gibbous; Moon at 17 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- 332 Pm Hst Thu Jul 18 2019
.small craft advisory in effect through Sunday afternoon...
Tonight..East winds to 30 knots. Wind waves 9 feet. Scattered showers.
Friday..East winds to 30 knots. Wind waves 9 feet. Isolated showers.
Friday night..East winds to 25 knots. Wind waves 8 feet. Isolated showers in the evening. Scattered showers after midnight.
Saturday..East winds to 25 knots. Wind waves 6 feet. Isolated showers.
Saturday night..East winds to 25 knots. Wind waves 5 feet. Isolated showers in the evening. Scattered showers after midnight.
Sunday..East winds to 25 knots. Wind waves 5 feet. Isolated showers.
Sunday night..East winds to 25 knots. Wind waves 5 feet. Scattered showers.
Monday..East winds 20 knots. Wind waves 5 feet. Isolated showers.
Tuesday..East winds 20 knots. Wind waves 5 feet. Isolated showers.
PHZ100 332 Pm Hst Thu Jul 18 2019
Synopsis for hawaiian coastal waters.. High pressure north of the state will maintain fresh to strong trades through Friday, then ease over the weekend as the high weakens. High pressure is expected to persist north of the state through early next week.


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 190126 cca
afdhfo
area forecast discussion
national weather service honolulu hi
325 pm hst Thu jul 18 2019

Synopsis
High pressure far to the north will provide trade winds into next
week, with wind speeds easing somewhat over the weekend. Clouds and
showers riding in with the trades will favor windward and mountain
areas, with showers most frequent during nights and mornings. An
area of especially showery clouds will arrive overnight, bringing
showers to many windward communities before departing Friday. A few
light showers may briefly spread to otherwise dry leeward areas,
with the exception being leeward big island, where clouds and a few
showers are expected each afternoon and evening.

Discussion
High pressure will remain entrenched far N and NE of the islands
over the next week, supporting a seasonable trade wind weather
pattern. The high will support locally strong ene trade winds
initially, with wind speeds easing slightly by Saturday as it
weakens a little. With trade winds blowing, clouds and showers will
focus over windward areas, but a few brief showers will spread
leeward on the smaller islands. On the big island, this is the wet
season for the leeward slopes, where afternoon and evening clouds
can be expected (nearly daily) to drop a few showers. Having said
that, today has been a bit of an exception, with only patchy
cloudiness noted.

The leading edge of an area of open-celled showery cumulus clouds is
moving in to windward big island and maui from the e, and will bring
a statewide increase in windward cloud and shower coverage
overnight, especially as compared to the current mostly dry
conditions. A few showers will spread leeward with the gusty trade
winds, but accumulations in general will be limited as models depict
this moisture moving W of the islands on Friday, and because the low-
levels will be capped at about 7000 feet. Latest goes-17 satellite
imagery reinforces this notion, as the incoming showery low cloud
field transitions to a more stable cloud field in an area about 300
to 800 miles E and NE of the islands.

About 800-1000 miles to the E and ne, the cloud field becomes more
showery, with GFS indicating these clouds leading to an increase in
low-level moisture that arrives on Saturday. Hard to bank on the
details of that verifying, with the general expectation being that
the trade winds will deliver periods of clouds and showers to
windward areas, especially during nights and mornings.

Generally speaking, the pattern aloft will feature low pressure to
the NW and a ridge to the se, with the low acting to occasionally
spread high clouds of varying thicknesses over the islands.

Currently, water vapor imagery shows a weak low aloft centered about
400 miles N of the islands, with an associated e-w oriented trough.

Afternoon soundings indicate that this feature is promoting
instability above a strong low-level subsidence inversion based near
7000 feet, with the unstable layer starting at 12000 feet on kauai.

With the unstable layer based near 15000 feet on the big island,
surface-based air parcels are not expected to be able to tap into
the instability, and upslope convection is not expected, even as the
trough aloft becomes n-s oriented over the area over the weekend.

With the low-level inversion remaining in place, rainfall amounts
will be limited, even as showery patches move through with the trade
winds.

Aviation
A high will remain nearly stationary far northeast of the main
hawaiian islands and maintain locally strong east winds over the
islands through Friday. Airmet tango is in effect for moderate
turbulence below 7,000ft and this airmet will likely continue into
Friday.

The low level winds will carry some clouds and showers over east
sections of the islands. An area of broken low clouds moving over
the islands from the east has produced an increase in cloud cover
over east sections of the big island of hawaii and east maui but
little in the way of low ceilings or visibilities. These clouds may
become more active this evening and produce localized MVFR
conditions over east sections of the islands. Airmet sierra for mtn
obsc could be required. The area of showery low clouds should clear
the islands Friday afternoon.

Marine
High pressure north of the state will maintain fresh to strong trade
winds through Friday. The high is expected to weaken some over the
weekend, which will help the winds ease slightly. Trade winds may
drop to moderate to fresh speeds early next week for a brief day or
two.

The small craft advisory (sca) continues through Friday afternoon
for all waters in response to the trade winds. The forecast calls
for the winds to start to weaken Friday night, which will drop the
sca back to the typical windier areas around maui and the big island
for the weekend.

Rough and choppy surf is expected to hold steady along east facing
shores at heights just below the advisory threshold through Friday.

As the winds ease over the weekend, surf is expected to drop
slightly. Some small background south and southwest swells are
expected through the weekend. An increase in surf along south facing
shores is possible early next week as a couple small southwest
swells arrive in the islands.

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

Small craft advisory until 6 pm hst Friday for kauai northwest
waters-kauai windward waters-kauai leeward waters-kauai channel-oahu
windward waters-oahu leeward waters-kaiwi channel-maui county
windward waters-maui county leeward waters-big island windward
waters.

Discussion... Birchard
aviation... Donaldson
marine... Kino


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 13 mi58 min NNE 18 G 24 77°F 1015.2 hPa
51213 27 mi52 min 84°F3 ft
51202 - Mokapu Point, HI (098) 61 mi52 min 81°F7 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 mi67 minNE 9 G 1615.00 miMostly Cloudy82°F69°F66%1015.6 hPa
Kahului, Kahului Airport, HI14 mi58 minNE 21 G 2810.00 miFair and Breezy83°F71°F67%1015.2 hPa
Lanai City, Lanai Airport, HI23 mi56 minNE 1410.00 miOvercast79°F71°F77%1014.6 hPa

Wind History from HJH (wind in knots)
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Last 24hr------------------------NE14
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--NE17
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1 day ago------------------------NE13NE9
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NE15NE13NE8
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2 days ago------------------------NE8N9E8
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E12NE11
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Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Thu -- 04:20 AM HST     0.95 feet High Tide
Thu -- 05:55 AM HST     Sunrise
Thu -- 07:29 AM HST     Moonset
Thu -- 09:25 AM HST     0.18 feet Low Tide
Thu -- 04:54 PM HST     2.38 feet High Tide
Thu -- 07:10 PM HST     Sunset
Thu -- 08:51 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.50.70.80.90.90.80.60.30.20.20.40.71.11.622.32.42.21.91.51.10.70.4

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Thu -- 02:31 AM HST     1.35 feet High Tide
Thu -- 05:54 AM HST     Sunrise
Thu -- 07:29 AM HST     Moonset
Thu -- 08:47 AM HST     -0.21 feet Low Tide
Thu -- 04:09 PM HST     2.62 feet High Tide
Thu -- 07:09 PM HST     Sunset
Thu -- 08:50 PM HST     Moonrise
Thu -- 10:45 PM HST     0.81 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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11.21.31.31.20.90.50.1-0.1-0.2-00.40.91.52.12.52.62.52.21.81.41.10.90.8

Weather Map and Satellite Images
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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.
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Wind Forecast for (23,6,7,8)
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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 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.