Saturday, June24, 2017 L-36.com


Marine Weather and Tides
Kapalua, HI

Version 3.4
What's New / NOTES
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 5:45AMSunset 7:11PM Friday June 23, 2017 7:30 PM HST (05:30 UTC) Moonrise 5:31AMMoonset 7:05PM Illumination 0% Phase: New Moon; Moon at 0 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- 346 Pm Hst Fri Jun 23 2017
Tonight..East winds 15 knots. Wind waves 4 feet. SWell east 3 feet. Isolated showers in the evening, then scattered showers after midnight.
Saturday..East winds 15 knots backing north in the afternoon. Wind waves 3 feet in the morning then 2 feet or less. SWell east 3 feet. Scattered showers in the morning. Isolated showers in the afternoon.
Saturday night..East winds 15 knots. Wind waves 3 feet. SWell east 3 feet. Isolated showers through the night.
Sunday..East winds 10 knots. Wind waves 2 feet or less then 3 feet in the afternoon. SWell northeast 3 feet. Isolated showers through the day.
Sunday night..East winds 15 knots. Wind waves 3 feet. SWell northeast 3 to 4 feet. Isolated showers.
Monday..East winds 15 knots. Wind waves 4 feet. SWell northeast 3 feet. Isolated showers.
Monday night..East winds 15 knots. Wind waves 4 feet. SWell northeast 3 feet. Isolated showers in the evening. Scattered showers after midnight.
Tuesday..East winds 20 knots. Wind waves 4 to 5 feet. SWell northeast 3 feet. Scattered showers.
Wednesday..Northeast winds to 25 knots. Wind waves 4 to 5 feet. SWell northeast 3 feet. Scattered showers.
PHZ100 346 Pm Hst Fri Jun 23 2017
Synopsis for hawaiian coastal waters.. Moderate to locally fresh trade winds will persist through the weekend, as a ridge of high pressure remains far north of the islands. As the high builds northeast of the area early next week, the trades will strengthen to locally strong levels across portions of the coastal waters.

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


Area Discussion for -
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Fxhw60 phfo 240148
afdhfo
area forecast discussion
national weather service honolulu hi
348 pm hst Fri jun 23 2017

Synopsis
A weak upper level disturbance passing over the islands this
weekend will weaken the trades and increase showers for some
areas. The upper level disturbance will weaken and move away early
next week as a a ridge of high pressure approaches the islands.

This will return more settled weather, and it will turn locally
windy starting about Tuesday.

Discussion
Gentle to locally breezy trades are blowing across the islands,
thanks mainly to a high pressure area about 1500 mi nnw of the
islands. The afternoon soundings show a capping inversion around
8-10kft, a little more elevated than previously. An area of
scattered to broken showery low clouds has been affecting the
islands today, but a lot of these have faded during the daytime.

Would expect to see showers fill in again tonight somewhat in this
environment.

Some relatively minor changes will occur this weekend. A weak 700
mb trough about 300 mi ese of the big island will be drifting w
toward the islands at the same time a weak trough in the mid-to-
upper levels of the atmosphere will be digging toward the islands
from the nw. Neither of these two features is especially
impressive, but will be enough to weaken the trade wind inversion
further and could induce a weak surface trough over the islands
this weekend that will push just W of the islands by mon. There
is some model disagreement as to how strong the surface trough
might be, will affect how much the low level flow weakens and
veers to E or ese and thus where showers will be most likely.

Hybrid patterns with weak trades can make for challenging
forecasts when you dig into the details. A middle of the road
approach suggests that there will be some leeward and interior
afternoon and evening showers due to sea breeze convergence, along
with night and morning showers favoring windward sections and
possibly south shores as well. With MLCAPE forecast to increase to
500-1000 j kg by Sunday over the northern main islands, any of
these could be briefly heavy, but moisture will be somewhat
limited and excessive rainfall appears unlikely.

By tue, the 700 mb trough will be well NW of the islands and lose
it's hold on our weather. At the same time, a surface ridge will
be approaching us from the N and nw, and models agree that a
drier and more stable airmass will overspread the state. This
should lead to more settled trade wind weather for the middle to
latter part of the week, with the tightening pressure gradient
leading to breezy to locally windy conditions.

Marine
A ridge of high pressure north of the islands will keep moderate
to occasionally breezy trade winds in place through the weekend,
but winds and seas are expected to remain below small craft advisory
(sca) levels. The trades are expected to strengthen again early
next week as high pressure builds northeast of the islands, and an
sca for winds will likely be needed for the typically windy waters
at that time.

A reinforcing ssw swell will peak this afternoon and evening.

Surf along south facing shores will remain above average into
early next week, but remain below advisory levels.

In addition to the new southerly swell, tides have been running
about a half a foot above predicted levels. These elevated tide
levels will increase the risk for minor coastal flooding when
combined with the above average south swell. For the next few
afternoons, the predicted high tides are around 2.5 feet above
mllw (not including the extra 1 2 foot mentioned above). See the
latest special weather statement (spshfo) for additional details
on the elevated tide levels and potential impacts.

Small trade wind and SE swells will continue into the weekend. In
the longer range, models still indicate a northeast swell
developing for the beginning of next week, but have scaled back on
the peak swell height by a foot or two. A high surf advisory is
looking less likely for this event, but may still be needed for
east facing shores if the swell comes in bigger than anticipated.

For more details on the surf, please refer to the oahu collaborative
surf forecast (srdhfo).

Aviation
Moderate trade winds will continue tonight with a slight weakening
of the winds tomorrow with localized sea breezes will become more
probable. Clouds and showers will tend to favor the windward and
mountain areas. Windward areas can expect passing showers to carry
periods of MVFR CIGS vis tonight.

Hfo watches warnings advisories
None.

R ballard stall eaton


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51205 11 mi51 min 79°F5 ft
KLIH1 - 1615680 - Kahului Bay, Maui, HI 13 mi42 min NE 13 G 20
51202 - Mokapu Point, HI (098) 61 mi56 min 80°F5 ft

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
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Last
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NE12
G15
NE6
N10
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NE9
G13
NW6
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G11
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N9
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NE6
G9
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G15
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G17
N11
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G14
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G18
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NE12
G19
1 day
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NE14
G19
NE9
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NE7
NE8
G11
NE10
G13
N9
E4
G8
N4
N5
G10
N6
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NE12
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G17
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N12
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NE14
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NE14
G17
NE13
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NE14
G18
NE12
G16
NE10
G17
2 days
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S2
NE12
G16
N11
NE11
G14
NE11
G14
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G18
NE14
G17
NE16
G20
NE17
G22
NE17
G21
N15
G20
NE15
G20
NE13
G21
NE11
G16
NE11
G19

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lahaina - West Maui, HI1 mi1.8 hrsENE 14 G 2015.00 miA Few Clouds82°F62°F51%1013.5 hPa
Kahului, Kahului Airport, HI14 mi36 minNE 1710.00 miPartly Cloudy79°F66°F67%1013.8 hPa
Lanai City, Lanai Airport, HI23 mi34 minENE 610.00 miOvercast73°F66°F81%1013.9 hPa

Wind History from HJH (wind in knots)
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Last 24hr------------------------NE7NE7NE4NE16
G22
NE14
G18
NE15
G21
NE12
G20
--NE12
G17
NE14
G19
NE10
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E14
G20
1 day ago------------------------NE8NE10
G14
NE11N12
G19
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NE18NE12
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NE15NE15NE15
2 days ago------------------------5E10NE12NE15E15NE15
G22
NE15
G22
NE17NE12
G20
NE15----

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Sat -- 03:26 AM HST     0.90 feet High Tide
Sat -- 05:47 AM HST     Sunrise
Sat -- 06:33 AM HST     Moonrise
Sat -- 08:49 AM HST     -0.23 feet Low Tide
Sat -- 04:20 PM HST     2.69 feet High Tide
Sat -- 07:11 PM HST     Sunset
Sat -- 08:07 PM HST     Moonset
Sat -- 11:30 PM HST     0.09 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.30.50.70.90.90.70.40.1-0.2-0.2-0.10.30.81.422.52.72.62.31.81.30.70.30.1

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Sat -- 01:46 AM HST     1.39 feet High Tide
Sat -- 05:46 AM HST     Sunrise
Sat -- 06:33 AM HST     Moonrise
Sat -- 08:10 AM HST     -0.71 feet Low Tide
Sat -- 03:34 PM HST     2.90 feet High Tide
Sat -- 07:10 PM HST     Sunset
Sat -- 08:06 PM HST     Moonset
Sat -- 10:10 PM HST     0.65 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.11.31.41.20.90.4-0.1-0.5-0.7-0.6-0.20.41.21.92.52.82.92.62.21.61.10.80.70.7

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
cpac_satellite

GOES Local Image of Hawaii    EDIT
Geos

Wind Forecast for (1,6,7,8)
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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.