Wednesday, December12, 2018 L-36.com


Marine Weather and Tides
Halaula, HI

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:44AMSunset 5:44PM Wednesday December 12, 2018 6:44 AM HST (16:44 UTC) Moonrise 11:04AMMoonset 10:37PM Illumination 26% Phase: Waxing Crescent; Moon at 5 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- 329 Am Hst Wed Dec 12 2018
.small craft advisory in effect through Friday afternoon...
Today..East winds to 30 knots. Wind waves 12 feet. Northwest swell 7 feet. Isolated showers.
Tonight..East winds to 30 knots. Wind waves 10 feet. Northwest swell 7 feet. Isolated showers through the night.
Thursday..East winds to 30 knots. Wind waves 12 feet. Northwest swell 6 feet. Isolated showers through the day.
Thursday night..East winds to 30 knots. Wind waves 13 feet. Northwest swell 6 feet. Isolated showers.
Friday..East winds to 30 knots. Wind waves 11 feet. Northwest swell 6 feet. Isolated showers in the afternoon.
Friday night..East winds to 25 knots. Wind waves 10 feet. Northwest swell 5 feet. Isolated showers.
Saturday..East winds to 25 knots. Wind waves 8 feet. Northwest swell 6 to 8 feet. Isolated showers.
Sunday..East winds 15 knots. Wind waves 6 feet. Northwest swell 8 to 9 feet.
PHZ100 329 Am Hst Wed Dec 12 2018
Synopsis for hawaiian coastal waters.. High pressure north of the state will keep strong trade winds blowing through the remainder of the work week. The high will weaken and settle southward and closer to the islands over the weekend, resulting in a gradual easing of the trade winds.


7 Day Forecast for Marine Location Near Halaula, HI
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location: 20.24, -155.77     debug


Area Discussion for -
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Fxhw60 phfo 121331
afdhfo
area forecast discussion
national weather service honolulu hi
331 am hst Wed dec 12 2018

Synopsis
Windy and wet weather will continue through Thursday as a strong
high pressure ridge lingers to the north of the hawaiian islands.

Wind speeds will weaken and showers will diminish on Friday as the
high slowly drifts east. Expect light winds and continued dry
sunny weather from Saturday through Monday as the ridge breaks
down further ahead of a cold front approaching the islands from
the northwest. Moderate to breezy trade winds and showers will
return on Tuesday and Wednesday as the front sweeps through the
island chain.

Discussion
Our windy and wet trade wind pattern continues through Thursday
due to a strong surface ridge of high pressure north of the
state. Instability in the lower atmosphere is due to a combination
of strong low level mixing and an trough in the upper levels
providing a large scale lift to the clouds upstream of the
hawaiian islands. A band of unstable open cell cumulus clouds shown
on the infra-red satellite picture looks kind of like a centipede
moving across the state from east to west. These showers will pass
through each island in waves with a bit of enhancement during the
overnight and early morning hours. The wind advisory was cancelled
this morning as wind speeds will remain below advisory thresholds.

Additional wind advisories are possible on Thursday as the surface
high builds and the wind speeds increase.

The high pressure surface ridge to the north of the islands will
weaken starting on Friday resulting in decreasing wind speeds as
the surface high center begins to drift eastward. Strong downward
vertical motions (or subsidence) will develop from Thursday
afternoon into Friday due to a strengthening upper level ridge
building over hawaii. The increase in subsidence aloft from this
upper ridge will effectively bring the stability hammer down,
lowering the height of the trade wind inversion to around 5000
feet, decreasing the thickness of the cumulus clouds, and
producing much less tropical rainfall in a more stable environment.

Additional weakening of the surface ridge will begin this weekend
as a cold frontal trough approaches the hawaii region from the
northwest. Expect light trade winds on Saturday becoming
primarily land and sea breezes with continued dry weather forecast
with interior afternoon clouds over each island on Sunday and
Monday. The 850 mb winds will shift to a more southeasterly
direction on Sunday moving the smaller islands into the lee of the
big island relative to the changing wind flow.

Not a lot has changed in the weather pattern over the past 24
hours and we will likely keep the same trends in the forecast
grids through the morning forecast package update. Overnight we
reduced precipitation chances on Friday and Saturday as stronger
subsidence aloft decreases precipitation chances. Models remain
in good agreement through Monday with slight differences in the
arrival timing of the shallow cold front passing through the
islands on Tuesday and Wednesday. The cloud heights associated
with this front remain on the shallow side, which translates to
less shower activity. However, increasing low level winds will
help to wring out showers along northern and windward slopes of
each island as the frontal zone passes by.

Aviation
A strong surface high north northeast of hawaii will maintain a
tight pressure gradient across the region late this afternoon and
into tonight, fueling a breezy to windy trade wind pattern.

Airmet tango remains in effect for all areas below 9000 feet
south and west of mountain ranges due to expected tempo moderate
turbulence. For lanai, the alenuihaha channel, and water south of
the big island, surface winds greater than 30 kt are forecast
through this afternoon and will likely continue tonight.

Moisture caught up in the trade wind flow will bring scattered
showers to mainly the windward slopes and mountain areas over the
next 24 hours. Isolated MVFR conditions in passing showers could
become more widespread across kauai or windward big island toward
morning.

Marine
Strong high pressure northeast of the islands is driving strong
trade winds across the marine area early this morning. The trades
are expected to ease slightly today as a cold front passes by
well to the north of the state. Strong trades will then return
Thursday and Thursday night as a new strong high builds north of
the area. The high will weaken as it settles slowly southward
Friday through early next week, gradually weakening the trade
winds.

An overnight ascat pass indicated that the trade winds have
dropped just below gale force, so the gale warning has been
cancelled for the alenuihaha and pailolo channels as well as
maalaea bay. A small craft advisory (sca) is now in effect for all
of the hawaiian coastal waters through Friday due to a
combination of strong winds and elevated seas. Another round of
gales is still possible Thursday and Thursday night for the
alenuihaha and pailolo channels as well as maalaea bay, although
the latest model runs have trended slightly weaker with the new
high building north of the state.

The current northwest swell will continue to build this morning,
then peak this afternoon into tonight just below the high surf
advisory (hsa) level. A smaller northwest swell is expected
Thursday night through Saturday, followed by a new, large,
northwest swell which will build late Saturday, and peak late
Saturday night and Sunday. This swell will likely produce warning
level surf along north and west facing shores. Another even larger
northwest swell is then expected to build late Monday or Monday
night, bringing another round of warning level surf to north and
west facing shores Tuesday through the middle of next week.

A hsa is in effect through Friday for east facing shores of
kauai, oahu, molokai, maui and the big island due to short period
choppy surf produced by the strong trades. Surf should lower
below advisory levels over the weekend as the trades diminish.

Hfo watches warnings advisories
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.

Small craft advisory until 6 pm hst Friday for all hawaiian
waters-
discussion... Bohlin
aviation... Bedal
marine... Jelsema


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 14 mi44 min E 14 G 24
ILOH1 - 1617760 - Hilo, HI 52 mi62 min SSW 6 G 8.9 70°F 78°F1021.6 hPa
KLIH1 - 1615680 - Kahului Bay, Maui, HI 58 mi44 min NNE 12 G 15

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Bradshaw Army Air Field / Hawaii, HI34 mi48 minSE 11 G 1710.00 miFair50°F45°F82%1021 hPa

Wind History from HSF (wind in knots)
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2 days agoSE6SE4SE5S4
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Tide / Current Tables for Mahukona, Hawaii Island, Hawaii
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Mahukona
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Wed -- 06:49 AM HST     Sunrise
Wed -- 07:00 AM HST     2.04 feet High Tide
Wed -- 11:04 AM HST     Moonrise
Wed -- 03:01 PM HST     0.29 feet Low Tide
Wed -- 05:45 PM HST     Sunset
Wed -- 08:17 PM HST     0.81 feet High Tide
Wed -- 10:37 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.50.81.11.41.72221.81.51.10.80.50.30.30.30.50.60.80.80.80.70.6

Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Kawaihae
Click for Map
Wed -- 06:48 AM HST     Sunrise
Wed -- 07:20 AM HST     2.11 feet High Tide
Wed -- 11:03 AM HST     Moonrise
Wed -- 02:52 PM HST     0.27 feet Low Tide
Wed -- 05:45 PM HST     Sunset
Wed -- 08:13 PM HST     0.82 feet High Tide
Wed -- 10:37 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.40.60.91.31.722.12.11.91.61.20.80.50.30.30.30.50.60.80.80.80.70.6

Weather Map and Satellite Images
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GOES Local Image of Hawaii    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Wind Forecast for (11,2,3,4)
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Ground Weather Radar Station Kohala, HI
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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.