Friday, June23, 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 12:21 AM HST (10:21 UTC) Moonrise 5:31AMMoonset 7:05PM Illumination 1% Phase: New Moon; Moon at 29 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- 930 Pm Hst Thu Jun 22 2017
Rest of tonight..East winds 20 knots. Wind waves 4 feet. South swell 3 feet. Slight chance of showers in the evening. Chance of showers after midnight.
Friday..East winds 20 knots. Wind waves 3 feet. South swell 3 feet in the morning. Chance of showers in the morning. Slight chance of showers in the afternoon.
Friday night..East winds 15 knots. Wind waves 3 feet in the evening then 2 feet or less. Slight chance of showers in the evening, then chance of showers after midnight.
Saturday..East winds 15 knots. Wind waves 2 feet or less. Scattered showers in the morning. Isolated showers in the afternoon.
Saturday night..East winds 10 knots. Wind waves 3 feet in the evening then 2 feet or less. Scattered showers in the evening, then isolated showers after midnight.
Sunday..East winds 15 knots. Wind waves 3 feet. Isolated showers.
Sunday night..East winds 15 knots. Wind waves 3 feet. Scattered showers.
Monday..East winds 10 knots. Wind waves 3 feet. Scattered showers.
Tuesday..East winds 20 knots. Wind waves 9 feet. Scattered showers.
PHZ100 930 Pm Hst Thu Jun 22 2017
Synopsis for hawaiian coastal waters.. Moderate to 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 marine area.

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 230650
afdhfo
area forecast discussion
national weather service honolulu hi
850 pm hst Thu jun 22 2017

Synopsis
Moderate trade winds will trend lighter over the weekend, but will
continue to deliver passing clouds and showers to windward areas,
mainly during nights and mornings. The lighter winds over the
weekend will likely allow afternoon sea breezes to drive the
formation of clouds and a few showers over leeward areas of all
islands, and a weak disturbance aloft may allow a few briefly heavy
showers to develop, especially on Sunday. Breezy trade winds are
expected to develop early next week.

Discussion
High pressure cells remain centered far nnw and nne of the islands,
with a low and associated stalled front separating the two. The low-
level gradient S of the highs is supporting trade wind flow over the
islands, with speeds ranging from light in sheltered leeward
locations to breezy in the more exposed areas. Soundings indicate
that the island atmosphere remains capped at a height near 8 kft,
which is sufficiently low to prevent significant rainfall, but also
sufficiently high to allow efficient warm rain processes to produce
light to moderate showers. Although recent rain gage reports
indicate little in the way of shower coverage and rainfall amounts,
the typical diurnal trend toward increased shower coverage is
expected overnight, with showers favoring windward slopes and
coasts. On water vapor imagery, a weakening low aloft about 1150
miles ene of the islands near 27n140w is noted to be moving N while
a weak trough aloft is approaching from the distant nw.

Little significant change to the overall weather pattern is expected
through Friday, with moderate trade winds delivering passing clouds
fueling a few showers, mainly over windward areas. A trend toward
weaker trade winds is anticipated Saturday into Monday as a weakness
in the low-level gradient, and potentially a weak low-level trough,
moves over the islands from the e. At the same time, a subtle
increase in low-level moisture is expected to arrive on the trade
flow.

Although the low aloft to the NE is expected to dissipate soon, it
leaves behind a weakness as the approaching trough aloft to the nw
helps to cool the mid-levels over the islands. The combination of
slowly and steadily cooling mid-level temperatures and the arrival
of increased moisture is expected to maintain passing showers over
windward areas. In addition, the light winds will likely allow
afternoon sea breezes to drive the development of clouds and showers
over leeward and interior areas, with the weakness aloft potentially
allowing a few showers to become briefly heavy. Latest guidance
indicates that greatest instability, although still modest, will be
over kauai and oahu, and centered on Sunday. Light winds and slower
shower movement means there will be a chance for higher localized
rain totals where any showers do develop. The combination of light
winds, the extreme Sun angle, and dew points near 70f will likely
make for sticky conditions over the weekend.

Early next week, the high to the nnw will move e, and models agree
that breezy ene trades will prevail, delivering a few showers to
windward areas. A ridge aloft is expected to build over the area
from the NW as the trough aloft dissipates and moves sw.

Aviation
Light to locally moderate trade winds will persist through the
period. Ragged clouds and scattered showers will continue to favor
windward and mountain areas. Brief MVFR conditions possible in
passing showers, especially at night. OtherwiseVFR conditions will
prevail all areas. No airmets in effect or anticipated at this time.

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 early next week
as high pressure builds northeast of the islands, and scas for winds
may be needed for the typically windy waters at that time.

A new reinforcing ssw swell will arrive tonight, peaking near or
just below advisory levels Friday. Surf along south facing shores
will remain above average Saturday and Sunday, and 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 mllw, which
does not include 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 indicate a northeast swell developing for
the beginning of next week. A high surf advisory may eventually 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) prepared by pat caldwell under wmo header
fxhw52 phfo.

Hfo watches warnings advisories
None.

Discussion... Birchard
aviation... Bedal
marine... Kinel


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51205 11 mi42 min 79°F4 ft
KLIH1 - 1615680 - Kahului Bay, Maui, HI 13 mi51 min NE 5.1 G 7 76°F 80°F1015.2 hPa
51202 - Mokapu Point, HI (098) 61 mi47 min 80°F5 ft

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
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NE10
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NE15
G19
N12
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NE12
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NE11
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N15
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NE11
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N4
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NE15
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G20
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G14
NE7
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NE12
G16
N7

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI14 mi27 minENE 510.00 miFair74°F64°F71%1015.2 hPa
Lanai City, Lanai Airport, HI23 mi25 minNE 1710.00 miFair70°F64°F84%1014 hPa

Wind History from HJH (wind in knots)
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Last 24hr------------------------NE8NE10
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NE18NE12
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NE15NE15NE15
1 day ago------------------------5E10NE12NE15E15NE15
G22
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NE15----
2 days ago------------------------NE10NE8NE10E15E15E12E10E10NE15E12NE15E8

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Fri -- 02:31 AM HST     0.95 feet High Tide
Fri -- 05:31 AM HST     Moonrise
Fri -- 05:47 AM HST     Sunrise
Fri -- 08:04 AM HST     -0.29 feet Low Tide
Fri -- 03:34 PM HST     2.69 feet High Tide
Fri -- 04:32 PM HST     New Moon
Fri -- 07:05 PM HST     Moonset
Fri -- 07:11 PM HST     Sunset
Fri -- 10:40 PM HST     0.13 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.80.90.90.80.50.1-0.2-0.3-0.20.10.61.31.92.42.62.72.421.40.80.40.20.1

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Fri -- 12:59 AM HST     1.44 feet High Tide
Fri -- 05:30 AM HST     Moonrise
Fri -- 05:46 AM HST     Sunrise
Fri -- 07:28 AM HST     -0.71 feet Low Tide
Fri -- 02:52 PM HST     2.87 feet High Tide
Fri -- 04:32 PM HST     New Moon
Fri -- 07:04 PM HST     Moonset
Fri -- 07:10 PM HST     Sunset
Fri -- 09:22 PM HST     0.68 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.41.41.310.60-0.4-0.7-0.7-0.40.20.91.72.32.82.92.72.31.81.30.90.70.70.9

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 (6,6,7,8)
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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.