Wednesday, March29, 2017 L-36.com


Marine Weather and Tides
Puako, HI

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:14AMSunset 6:34PM Tuesday March 28, 2017 7:18 PM HST (05:18 UTC) Moonrise 6:59AMMoonset 7:38PM Illumination 3% Phase: Waxing Crescent; Moon at 2 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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PHZ121 Alenuihaha Channel- 616 Pm Hst Tue Mar 28 2017
Tonight..East winds 20 kt. Wind waves 6 ft. Northwest swell 6 ft. Isolated showers after midnight.
Wednesday..East winds 20 kt. Wind waves 6 ft. Northwest swell 6 ft. Scattered showers in the morning.
Wednesday night..East winds 20 kt. Wind waves 6 ft. Northwest swell 6 ft. Scattered showers.
Thursday..East winds 20 kt. Wind waves 6 ft. Northwest swell 5 ft. Scattered showers.
Thursday night..East winds 20 kt. Wind waves 6 ft. Northwest swell 5 ft. Scattered showers.
Friday..East winds 20 kt. Wind waves 6 ft. Northwest swell 8 ft increasing to 10 ft in the afternoon. Scattered showers in the morning. Isolated showers in the afternoon.
Friday night..East winds to 25 kt. Wind waves 7 ft. Northwest swell 10 ft. Isolated showers in the evening. Scattered showers after midnight.
Saturday..East winds to 25 kt. Wind waves 8 to 9 ft. West swell 7 to 9 ft. Isolated showers.
Sunday..East winds to 30 kt. Wind waves 9 ft. Northwest swell 5 to 7 ft. Isolated showers.
PHZ100 616 Pm Hst Tue Mar 28 2017
Synopsis for hawaiian coastal waters.. High pressure northeast of the islands will shift east through midweek as a cold front passes far north of the state. High pressure will build north of the state over the weekend.

7 Day Forecast for Marine Location Near Puako, HI
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location: 20.04, -155.83     debug


Area Discussion for -
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Fxhw60 phfo 290202
afdhfo
area forecast discussion
national weather service honolulu hi
402 pm hst Tue mar 28 2017

Synopsis
A surface ridge north of the state will maintain light to
moderate east to east-southeast surface winds across the islands
through Friday. An upper level trough, which will dig east of the
island chain later tonight and Wednesday, is expected to bring an
increase in showers early Wednesday morning through Saturday. A
surface high building far northeast of the area starting late
Friday will produce breezy trades this weekend.

Discussion
A nearly stationary 1031 mb surface high is centered far east-
northeast of hawaii this afternoon. A surface ridge extends west-
southwest from this high passing about 300 miles north of kauai.

The pressure gradient south and southwest of these features is
maintaining light to moderate east to east-southeast wind flow
across the state. Water vapor imagery shows a shortwave trough
near oahu this afternoon digging towards just east of the state.

Afternoon soundings at hilo and lihue show dry and stable
midlevels, strong inversions and below normal precipitable water
values of 0.8 to 1 inch. Radar shows that much of the showers
from this morning have dissipated this afternoon. Due to the light
wind flow over the state, sea breezes have resulted in cloud build
ups over the leeward sides of the islands this afternoon. These
clouds should gradually dissipate this evening.

Water vapor imagery shows a shortwave trough currently passing
north of oahu, and is expected to merge into a much stronger
trough aloft east of the state by Wednesday morning before slowly
tracking away to the east through this weekend.

The surface ridge is expected to remain north of the islands through
Thursday night, which will continue to drive the light to moderate
east to east-southeast flow. With trade winds upstream, models
show an increase in showers expected to push in from the east
early Wednesday morning. The presence of this trough aloft east of
the area will enhance the low clouds and precipitation tracking in
from upstream through Saturday. The light winds will also continue
on Friday.

Therefore, expect wetter trade wind type weather after tonight
with the relatively weak low level flow focusing most of these low
clouds and showers over windward and southeast facing slopes.

While leeward areas should stay relatively dry at night, sea breezes
will continue to dominate over the next several days and produce
cloud build ups and showers. Given the relative atmospheric stability
over hawaii, showers enhanced by the upstream trough will likely
be loosing their intensity as they reach the islands. Therefore,
while it will likely be wetter than it has been, we do not
anticipate a flooding-type situation.

The surface ridge to our north is expected to erode some time on
Thursday, as a cold front approaches from the northwest. This
front will likely stall and weaken two to three hundred miles
north-northwest of kauai by late Friday, so it is not expected to
ever reach the state. However, the forecast models continue to
suggest a band of clouds and showers will form near the western
end of the state to the southeast of the front. These low clouds
and showers might produce moderate rains over parts of the state,
particularly the western islands, late Thursday and Friday.

Surface high pressure is expected to build far northeast of the region
this weekend, which will likely produce breezy trade winds across
the hawaiian islands beginning Friday night through early next
week. Clouds and showers will continue on Saturday, but a slightly
drier air mass is expected over most of the state beginning on
Sunday.

Aviation
Airmet sierra for mountain obscuration was recently cancelled as
lingering clouds and showers have continued to thin after a brief
uptick in coverage. The big island has the most clouds overhead
this afternoon, but expect clouds to thin overnight. The clouds
are topping out around 9000 ft. The north to south oriented jet
forecast to be over the islands this afternoon has not been as
strong as the models indicated, so have not issued a sigmet. Will
continue to monitor the situation.

Marine
The west-northwest (290-310 deg) swell that peaked Sunday into
Monday will hold through mid week due to a slight reinforcement
tonight into Wednesday. A combination of this swell and moderate
to fresh breezes over the channels and waters around the big
island will continue to generate rough boating conditions.

Although the winds have dropped slightly below small craft
advisory levels (25 kt), seas will hold around 10 ft through the
day today across windward waters between the big island and oahu.

As a result, the small craft advisory will remain up across these
areas for seas today. Surf associated with the west-northwest
swell should remain just below advisory levels along exposed
north and west facing shores through mid week.

Winds should remain below advisory levels through Friday as the
ridge of high pressure north of the state slightly weakens in
response to a two weak cold fronts passing north of the area.

Advisory- level winds will likely return across portions of the
waters over the weekend as high pressure builds north of the state
behind the second front.

Surf along east facing shores will remain small and choppy through
the week due to persistent moderate to fresh onshore winds, but
increase over the weekend as winds strengthen again locally. A
slight increase in surf along south facing shores will be possible
Thursday through Saturday due to a long-period swell (190 deg)
associated with recent activity across the southern pacific.

The main forecast challenge will be centered on another, slightly
larger, west-northwest (290-310 deg) swell that will impact the
islands Thursday night through the weekend. This is due to a powerful
storm-force low currently tracking east-northeastward across the
northwest pacific. Recent ascat and altimeter obs support latest model
model runs with regard to wind speeds and resulting sea heights.

The large west-northwest swell associated with this system could
reach the islands as early as Thursday night, peak through the day
Friday and Friday night, then slowly ease over the upcoming
weekend. Warning-level surf and advisory-level seas are expected
Friday into the weekend before trending down through the beginning
of next week. The southern shores could see impacts from this
swell again at select spots due to wrapping around the islands.

Hfo watches/warnings/advisories
None.

Discussion... Foster
aviation... M ballard
marine... Ts


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 0 mi48 min WSW 4.1 G 5.1 78°F 80°F1017.1 hPa
ILOH1 - 1617760 - Hilo, HI 46 mi48 min ESE 4.1 G 5.1 76°F 76°F1018.1 hPa
51206 49 mi36 min 78°F8 ft
KLIH1 - 1615680 - Kahului Bay, Maui, HI 68 mi48 min NNE 16 G 18 76°F 78°F1017.7 hPa
51203 - Kaumalapau, HI (146) 81 mi33 min 78°F5 ft

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Bradshaw Army Air Field / Hawaii, HI23 mi22 minSE 410.00 miMostly Cloudy57°F48°F73%1018.2 hPa

Wind History from HSF (wind in knots)
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Last 24hrSE4SE4SE4SE3SE4CalmSE5--SE4SE5SE3SE4S6S8SE8CalmW9
G15
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1 day agoW6E6SE11S13
G18
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CalmSE4W5SE4SE11
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2 days agoSE16
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Tide / Current Tables for Kawaihae, Hawaii Island, Hawaii
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Kawaihae
Click for Map
Wed -- 04:58 AM HST     1.77 feet High Tide
Wed -- 06:19 AM HST     Sunrise
Wed -- 07:45 AM HST     Moonrise
Wed -- 11:05 AM HST     -0.17 feet Low Tide
Wed -- 05:37 PM HST     2.17 feet High Tide
Wed -- 06:36 PM HST     Sunset
Wed -- 08:39 PM HST     Moonset
Wed -- 11:58 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
0.10.50.91.31.71.81.61.30.80.4-0-0.2-0.10.30.81.41.82.12.11.91.510.60.2

Tide / Current Tables for Kailua Kona, Hawaii Island, Hawaii
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Kailua Kona
Click for Map
Wed -- 04:31 AM HST     1.72 feet High Tide
Wed -- 06:19 AM HST     Sunrise
Wed -- 07:46 AM HST     Moonrise
Wed -- 10:45 AM HST     -0.27 feet Low Tide
Wed -- 05:15 PM HST     1.93 feet High Tide
Wed -- 06:37 PM HST     Sunset
Wed -- 08:39 PM HST     Moonset
Wed -- 11:23 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
0.20.611.41.71.71.51.10.60.1-0.2-0.3-0.10.30.81.31.71.91.91.61.10.70.30.1

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 (1,6,7,8)
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Ground Weather Radar Station Kohala, 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.