Friday, January19, 2018 L-36.com


Marine Weather and Tides
Kapalua, HI

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
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 7:03AMSunset 6:10PM Friday January 19, 2018 1:30 AM HST (11:30 UTC) Moonrise 8:58AMMoonset 8:41PM Illumination 7% Phase: Waxing Crescent; Moon at 3 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- 933 Pm Hst Thu Jan 18 2018
.gale warning in effect through early Friday morning...
Rest of tonight..East gales to 35 knots. Wind waves 11 feet. North swell 5 feet. Scattered showers.
Friday..East winds to 25 knots. Wind waves 10 feet. North swell 4 feet. Scattered showers in the morning. Isolated showers in the afternoon.
Friday night..East winds to 25 knots. Wind waves 9 feet. North swell 4 feet. SWell east 6 feet. Isolated showers.
Saturday..East winds 20 knots backing northwest in the afternoon. Wind waves 4 feet. North swell 3 feet and east 6 feet. Isolated showers through the day.
Saturday night..East winds 15 knots. Wind waves 3 feet. Mixed swell north 3 feet and east 6 feet. Isolated showers.
Sunday..East winds 10 knots. Wind waves 2 feet or less. Mixed swell northwest 4 feet and east 6 feet. Isolated showers.
Sunday night..Northeast winds 15 knots. Wind waves 2 feet or less. Mixed swell northwest 4 feet and east 6 feet. Isolated showers.
Monday..East winds 15 knots. Wind waves 3 feet. Mixed swell northwest 4 feet and east 5 to 6 feet. Isolated showers.
Tuesday..East winds 15 knots. Wind waves 3 to 4 feet. Mixed swell northwest 3 to 4 feet and east 5 feet. Scattered showers.
PHZ100 933 Pm Hst Thu Jan 18 2018
Synopsis for hawaiian coastal waters.. Strong high pressure north-northeast of the islands will continue to move eastward through Friday, causing the trade winds to weaken. An approaching front will cause winds to become southeast over the western waters by the middle of next week.

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 190631
afdhfo
area forecast discussion
national weather service honolulu hi
831 pm hst Thu jan 18 2018

Synopsis
A strong high pressure center located north-northeast of oahu
this evening will continue to drift eastward away from the state.

Expect the windy weather across the hawaiian islands to continue
through the overnight hours. Wind speeds will weaken tomorrow
morning as the high moves far enough away from the state to allow
land and sea breezes to develop along southern and western slopes
of all islands from Saturday onward. Two bands of unstable clouds
are moving westward across each island tonight with enhanced cloud
ceilings and scattered shower activity mainly along windward
mountains and slopes. For next week, light east to southeast wind
directions will shift to southeasterly by Wednesday with southerly
flow possible by the end of the week as a cold front approaches
the islands from the northwest.

Discussion
Strong and gusty trade winds will continue through the overnight
hours as the strong high pressure center 800 to 1000 miles
north-northeast of hawaii continues to move eastward away from
the state. A low pressure area with a cold front will move into
the central pacific helping to weaken the high pressure ridge axis
over the islands. This shifting large scale pressure pattern will
weaken the local pressure gradient over the hawaiian islands and
cause a decrease in wind speeds starting tomorrow morning.

A high wind warning remains in effect for the kohala district of
the big island through the overnight hours with wind gusts greater
than 60 mph reported by local observations. A wind advisory also
remains in effect for the rest of the state until tomorrow
morning. The kohala district high wind warning will probably be
downgraded to wind advisory conditions by tomorrow morning. The
wind advisory elsewhere may need to be extended for some wind
favored locations as the wind speeds gradually recede. The evening
forecast continues to match current conditions with no evening
updates expected.

Saturday and Sunday... A decreasing wind trend will develop as the
high pressure ridge north of the islands weakens substantially. A
weakening cold frontal boundary will stall just 200 miles
northwest of kauai as wind directions range from east to
southeast over the islands. Lighter east to southeast wind speeds
will allow on-shore sea breezes to develop along the western and
southern slopes of all islands by Saturday afternoon with off-
shore land breezes developing by Saturday night. Southeasterly
wind flow may aloft and weak sea breezes may keep shower activity
for most areas more isolated.

Monday and Tuesday... The ridge aloft remains weak with light
east to southeasterly winds. Meanwhile an upper level low shown
on the 500 mb chart is expected to drift into the hawaiian
islands. This low will set up around 300 miles northeast of the
islands likely enhancing upstream shower activity especially for
the northern islands of kauai and oahu. Forecast guidance on the
intensity of this upper level low between the european (ecmwf)
models showing a deeper system and the american (gfs) models
showing a weaker system are large enough to keep the chances for
precipitation impacts in the fair range at this point.

Wednesday through next Thursday... A deeper low pressure system
is forecast to sweep across the central pacific with a cold front
approaching the islands from the northwest. Wind directions will
veer towards the south by Thursday as pressure gradients shift
ahead of this next frontal system. Both global weather models are
in good agreement with this deeper solution and therefore we
should expect higher chances for showers along prefrontal
convergence bands in this developing weather pattern. Stay tuned.

Aviation
Strong trade winds are producing moderate to severe turbulence
near and downwind of island terrain, and thus airmet tango
continues. This airmet also includes strong surface winds across
all islands.

Vfr conditions will prevail, however passing clouds and showers
will bring periods of MVFR conditions. No mountain obscuration is
anticipated, but a band of low clouds affecting windward sections
of the islands may cause problems later. Overnight observations
will be monitored for its possible occurrence.

Marine
A gale warning (gw) remains in effect this evening for the
typically windy waters sensitive to the trade winds. The gw is
good through 6am hst Friday morning, and this timing looks good at
this point as the trades are expected to begin weakening tonight.

The areas of the gw will ease to small craft advisory (sca) level
winds, and this SCA is slated to continue through Friday
afternoon. There is a good possibility that the SCA will be
extended through Friday night, and maybe Saturday, as described
below. The SCA cover the rest of the hawaiian coastal waters, but
some zones will be canceled at 6 am hst Friday as the trades
soften.

A strong, broad surface high of 1037 mb is the system responsible
for the strong and blustery trade winds. This high, located some
850 nm nne of the islands this evening, will continue to moving
east, further away from the islands. This will cause the trades
to soften, and veer toward the east and southeast over the weekend.

A high surf advisory (hsa) remains in effect for east facing
shores through tomorrow night, but may need to be extended into
weekend due to a large area of moderate to strong trades east of
the islands, despite the trades trending down locally. Surf
heights of around 8 feet will likely hold through Sunday for the
east facing shores. Further more, the SCA may be extended into
Sunday as well for waters exposed to this to the combination of
the winds and elevated seas associated with this easterly swell.

Surf will remain below advisory levels for the remaining shoreline
through this weekend. A small northwest swell (330 degrees) is
expected arrive Saturday night, and be reinforced with a moderate
west- northwest (300 degrees) swell on Sunday night through
Monday. The latter swell may warrant a hsa for the north facing
shores of some of the smaller islands.

Hfo watches warnings advisories
Wind advisory until 6 am hst Friday for niihau-kauai-oahu-
molokai-lanai-kahoolawe-maui windward west-maui leeward west-
maui central valley-windward haleakala-leeward haleakala-kona-
south big island-big island north and east-big island interior.

High surf advisory until 6 pm hst Friday for kauai windward-oahu
koolau-olomana-molokai windward-maui windward west-windward
haleakala-south big island-big island north and east.

High wind warning until 6 am hst Friday for kohala.

Gale warning until 6 am hst Friday 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 channel-oahu windward waters-
kaiwi channel-maui county windward waters-big island windward
waters.

Small craft advisory until 6 am hst Friday for kauai leeward
waters-oahu leeward waters-maui county leeward waters.

Discussion... Bohlin
aviation... Powell
marine... Lau


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51205 11 mi61 min 76°F13 ft
KLIH1 - 1615680 - Kahului Bay, Maui, HI 13 mi43 min NE 20 G 26 74°F 74°F1019.1 hPa
51202 - Mokapu Point, HI (098) 61 mi57 min 76°F13 ft

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
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Last
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NE16
G25
NE9
G18
NE13
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NE17
NE14
G21
NE14
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NE15
G20
NE12
G22
NE15
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G25
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G28
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G31
NE27
G33
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G40
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G31
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NE19
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NE18
G29
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NE22
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G26
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NE16
G25
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ago
NE8
G12
NE12
G16
NE14
G18
NE8
G11
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G14
NE13
G16
NE11
G18
NE10
G18
NE13
G21
NE16
G22
NE13
G17
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NE17
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NE14
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NE17
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NE17
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NE14
G23
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G24
NE15
G24
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NE12
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G20
NE17
G26
2 days
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NE11
G14
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NE10
G14
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G17
N15
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G18
NE14
G18
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G20
NE12
G16

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI14 mi37 minENE 14 G 2710.00 miFair73°F66°F79%1018.6 hPa
Lanai City, Lanai Airport, HI23 mi35 minNNE 610.00 miFair67°F62°F84%1018.4 hPa

Wind History from HJH (wind in knots)
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Last 24hr------------------------N8N5E9
G21
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NE17
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G28
NE12
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NE12
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NE15
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G35
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1 day ago------------------------NE9
G15
N6NE14
G21
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G28
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G24
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G23
2 days ago------------------------NE9N14NE15N15N20NE14
G26
N19
G26
NE13
G22
NE19NE20
G28
NE19N19

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
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Fri -- 05:04 AM HST     2.29 feet High Tide
Fri -- 07:05 AM HST     Sunrise
Fri -- 08:58 AM HST     Moonrise
Fri -- 12:07 PM HST     0.30 feet Low Tide
Fri -- 05:19 PM HST     1.05 feet High Tide
Fri -- 06:09 PM HST     Sunset
Fri -- 08:41 PM HST     Moonset
Fri -- 10:25 PM HST     0.28 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.611.51.92.22.32.21.91.51.10.70.40.30.40.50.80.9110.90.70.40.30.3

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Fri -- 04:15 AM HST     2.52 feet High Tide
Fri -- 07:05 AM HST     Sunrise
Fri -- 08:57 AM HST     Moonrise
Fri -- 10:47 AM HST     0.66 feet Low Tide
Fri -- 03:25 PM HST     1.33 feet High Tide
Fri -- 06:08 PM HST     Sunset
Fri -- 08:40 PM HST     Moonset
Fri -- 09:32 PM HST     -0.12 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.71.31.92.32.52.42.21.81.30.90.70.70.811.21.31.31.10.80.50.1-0.1-0.10.1

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.