Wednesday, January17, 2018 L-36.com


Marine Weather and Tides
Kahului, 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 7:04AMSunset 6:08PM Tuesday January 16, 2018 7:02 PM HST (05:02 UTC) Moonrise 6:48AMMoonset 6:07PM 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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PHZ119 Maalaea Bay- 327 Pm Hst Tue Jan 16 2018
.small craft advisory in effect through early Wednesday morning...
.gale watch in effect from Wednesday morning through late Thursday night...
Tonight..North winds to 25 knots. Wind waves around 4 feet.
Wednesday..North gales to 35 knots. Wind waves around 5 feet.
Wednesday night..North gales to 35 knots. Wind waves around 5 feet.
Thursday..North gales to 35 knots. Wind waves around 5 feet.
Thursday night..Northeast winds to 30 knots. Wind waves around 5 feet.
Friday..North winds to 30 knots. Wind waves around 4 feet. Isolated showers in the morning.
Friday night..North winds 20 knots. Wind waves around 3 feet.
Saturday..North winds 20 knots, becoming east 10 knots. Wind waves around 2 feet or less.
Sunday..East winds 10 knots in the morning, becoming variable less than 10 knots, then becoming east 10 knots. Wind waves around 3 feet. Isolated showers.
PHZ100 327 Pm Hst Tue Jan 16 2018
Synopsis for hawaiian coastal waters.. Strong high pressure north of the area will bring increasing trade winds overnight through Thursday. As the high moves away from the area at the end of the week, winds will subside to moderate levels.

7 Day Forecast for Marine Location Near Kahului, HI
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location: 20.9, -156.47     debug


Area Discussion for -
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Fxhw60 phfo 170115
afdhfo
area forecast discussion
national weather service honolulu hi
315 pm hst Tue jan 16 2018

Synopsis
Trade winds will strengthen tonight and Wednesday, with windy
weather continuing into Friday as a strong high passes north of the
islands. The building trade winds are expected to bring an increase
in windward showers, especially Thursday and Friday, with a few
showers occasionally spreading leeward. A decrease in wind speeds is
expected over the weekend.

Discussion
Island weather remains rather benign this afternoon, as a deep-layer
ridge continues to support a stable and dry atmosphere, evidenced by
afternoon soundings indicating pwat near 0.8" and a subsidence
inversion based between 4000' and 5000'. A surface ridge just N of
kauai is supporting moderate to locally fresh ene trade winds that
are escorting scattered low clouds over windward portions of the
islands, with radar detecting isolated light showers. Further
afield, a 1030 mb surface high is centered far to the nw, while a
cold front 300 miles NW of kauai lies between the islands and the
high. A potent low is seen developing along the front to the W of
midway atoll, or about 2100 miles wnw of the islands.

While the surface ridge just N of the islands will gradually
dissipate overnight, the high to the distant NW will begin to make
its presence felt by tightening the local pressure gradient -
leading to increasing trade winds. The high will strengthen as it
tracks steadily E along ~35n, peaking near 1037 mb when it passes n
of the islands Wednesday night. The high will bring windy conditions
later Wednesday into Thursday (and possibly into Friday), likely
necessitating a wind advisory for at least portions of the state.

Have decided to hold off on its issuance with this forecast package
due to uncertainty surrounding the strength of Wednesday's wind,
especially early.

Moisture associated with the front to the NW is expected to remain n
of the islands as it stalls, and a mid-level ridge will continue to
support a stable atmosphere through midweek. Thus, limited windward
rainfall is expected, even as the increasing trades deliver a few
windward clouds. An increase in low-level moisture and greater
orographic forcing supplied by the strong winds should lead to an
increase in trade wind showers for Thursday and Friday. A few stray
showers may be blown leeward, but mostly dry conditions will prevail.

The high will be far NE of the islands by Friday, with a ridge
extending to the N of the islands. Forecast models continue to
indicate that the low pressure wave to the distant wnw will track
toward the NE through the weekend. The evolution of this feature is
where the solutions differ Friday into next weekend, leading to some
forecast uncertainty. The GFS continues to indicate a significant
decrease in the wind by Friday as the low impacts the ridge, with
light and variable winds over the weekend as an associated front
lingers N of the islands. The ECMWF solution keeps the low and front
further to the n, keeping the ridge intact to the N of the islands
through the weekend. The official forecast leans toward the stronger
winds of the ECMWF on Friday, and then is a blend of the GFS ecmwf
for the weekend, indicating gentle to moderate trade winds. Another
high passing far N of the area may support moderate trade winds
early next week.

Aviation
With high pressure building far to the northwest, trade winds will
be strengthening across the island chain. Also,VFR will
predominate, with only brief MVFR conditions possible in windward
and mauka sections in passing trade showers.

No airmets are currently posted, but one will likely be issued later
today for low level turbulence to the lee of the mountains as trade
winds intensify.

Marine
A high surf advisory remains in effect through Wednesday for north
and west facing shores of the smaller islands exposed to the current
northwest swell. This swell is expected to subside through tonight,
however a new swell, from a low far north of oahu, will boost surf
heights again on Wednesday. The incoming swell will be monitored to
see if the advisory needs to be extended.

The small craft advisory (sca) is now in effect for all waters due
to increasing winds and seas. The strong high passing north of the
islands is responsible for the increase in trade winds, which could
reach gale force over the typical windier locations near the big
island and maui county Wednesday. A gale watch is in effect for
those areas starting Wednesday morning and continuing through
Thursday night. The SCA was extended earlier today to continue
through the same time period.

The increasing trade winds will bring large, rough seas to east
facing shores, likely requiring a high surf advisory during the
second half of the work week.

See the latest oahu surf discussion (srdhfo) for additional details
on surf and swell.

Hfo watches warnings advisories
High surf advisory until 6 pm hst Wednesday for north and west
facing shores of niihau kauai oahu molokai and for north facing
shores of maui.

Small craft advisory until 6 am 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-big island leeward waters.

Gale watch from Wednesday morning through late Thursday night for
maalaea bay-pailolo channel-alenuihaha channel-big island southeast
waters.

Small craft advisory until 6 am hst Wednesday for maalaea bay-
pailolo channel-alenuihaha channel-big island southeast waters.

Discussion... Birchard
aviation... Kinel
marine... M ballard


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 0 mi50 min NNE 15 G 17 74°F 76°F1020.2 hPa
51205 8 mi32 min 76°F8 ft
51202 - Mokapu Point, HI (098) 73 mi28 min 77°F6 ft

Wind History for Kahului, Kahului Harbor, HI
(wind in knots)    EDIT      (on/off)   Help
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N4
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G11
N9
N9

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI2 mi68 minNE 1710.00 miPartly Cloudy75°F64°F71%1020.2 hPa
Lahaina - West Maui, HI12 mi77 minNNE 1915.00 miPartly Cloudy and Breezy73°F66°F78%1020 hPa

Wind History from HOG (wind in knots)
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Last 24hrNE15NE13NE14NE13NE9NE13NE11CalmNE7NE4NE5NE5NE10NE13NE18NE17NE19NE18NE21NE22
G26
NE19NE16NE17NE15
1 day agoN7NE7N9NE8S3SE4CalmE3E5CalmCalmN4NE6NE9NE17NE18NE18NE20NE20
G24
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2 days agoCalmSE5CalmE5E3S3CalmSE4CalmSE7E3CalmCalmN4N7N8N11N10N12N12NE9N11NE10NE6

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Wed -- 03:19 AM HST     2.59 feet High Tide
Wed -- 07:05 AM HST     Sunrise
Wed -- 07:32 AM HST     Moonrise
Wed -- 09:47 AM HST     0.72 feet Low Tide
Wed -- 02:15 PM HST     1.36 feet High Tide
Wed -- 06:07 PM HST     Sunset
Wed -- 06:57 PM HST     Moonset
Wed -- 08:32 PM HST     -0.35 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.31.92.42.62.52.31.81.410.80.70.811.21.31.31.10.70.3-0.1-0.3-0.3-0.10.4

Tide / Current Tables for Kihei, Maui (Hawaii)
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Kihei
Click for Map
Wed -- 04:35 AM HST     2.47 feet High Tide
Wed -- 07:04 AM HST     Sunrise
Wed -- 07:32 AM HST     Moonrise
Wed -- 11:18 AM HST     0.20 feet Low Tide
Wed -- 04:42 PM HST     1.01 feet High Tide
Wed -- 06:07 PM HST     Sunset
Wed -- 06:58 PM HST     Moonset
Wed -- 09:52 PM HST     -0.04 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.71.21.72.22.42.42.21.81.20.70.40.20.20.40.60.8110.90.60.30-00.1

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 (0,6,7,8)
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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.