Tuesday, December18, 2018 L-36.com


Marine Weather and Tides
Kahaluu-Keauhou, 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 6:48AMSunset 5:47PM Tuesday December 18, 2018 5:00 PM HST (03:00 UTC) Moonrise 2:51PMMoonset 2:51AM Illumination 88% Phase: Waxing Gibbous; Moon at 11 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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PHZ123 Big Island Leeward Waters- 344 Pm Hst Tue Dec 18 2018
.small craft advisory in effect through early Thursday morning...
Tonight..Northeast winds 20 knots. Wind waves 5 feet. Northwest swell 7 feet.
Wednesday..West of the big island, east winds 15 knots veering south in the afternoon. NEar south point, north winds 10 knots becoming east 20 knots in the afternoon. Wind waves 9 feet. Northwest swell 7 feet. Isolated showers in the afternoon.
Wednesday night..North winds 10 knots west of the big island... East 20 knots near south point. Wind waves 8 feet. Northwest swell 7 feet. Isolated showers.
Thursday..West of the big island, north winds 10 knots in the morning becoming variable less than 10 knots. NEar south point, east winds to 25 knots. Wind waves 7 feet. Northwest swell 6 feet. Isolated showers in the morning.
Thursday night..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 8 feet. Northwest swell 5 feet.
Friday..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 7 feet. Northwest swell 4 feet.
Friday night..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 7 feet. Northwest swell 3 feet.
Saturday..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 7 to 8 feet. Northwest swell 3 feet.
Sunday..West of the big island, winds variable less than 10 knots becoming west 10 knots in the afternoon and evening, then becoming variable less than 10 knots after midnight. NEar south point, east winds 20 knots. Wind waves 7 to 9 feet. Northwest swell 3 feet.
PHZ100 344 Pm Hst Tue Dec 18 2018
Synopsis for hawaiian coastal waters.. A front has passed through kauai and will continue southeastward through the island chain tonight. The front is then expected to stall and dissipate within the vicinity of the big island Wednesday and Wednesday night. Additionally, a large northwest swell will peak this evening, with combined seas greater than 10 feet or more in many areas through Wednesday night and possibly into the day on Thursday. High pressure will build north of the state Thursday and gradually shift east over the weekend.


7 Day Forecast for Marine Location Near Kahaluu-Keauhou, HI
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location: 19.61, -155.97     debug


Area Discussion for -
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Fxhw60 phfo 190230
afdhfo
area forecast discussion
national weather service honolulu hi
430 pm hst Tue dec 18 2018

Synopsis
A weakening cold front currently moving through the western
islands will spread clouds and showers across the state from west
to east through Thursday. More typical trade wind weather remains
in the forecast from Friday onward with a drying trend over the
weekend. By next week Tuesday an upper level low drifts into the
big island with potential for enhanced rainfall and a few
thunderstorms.

Discussion
The weakening cold front continues to move through the western
islands this afternoon with the leading edge of the front,
identified on visible satellite imagery as a 'rope cloud', will
reach oahu in a few hours. A wind advisory was issued this
afternoon as surface wind speeds will increase above wind
advisory thresholds over portions of niihau and kauai in the
overnight period. Stronger winds will spread to windier areas of
maui and hawaii counties by early Wednesday morning.

Clouds and showers will develop along the frontal zone with
northerly winds focusing these showers over north and northeastern
slopes of each island with some showers drifting into leeward
areas. Cloud heights in the model cross sections are reaching 8000
to 10000 feet, certainly high enough for enhanced shower activity
along mountain slopes. The forward motion of the frontal zone
will then stall over the big island by Wednesday morning into
Thursday with windward clouds and showers lingering in the
forecast for maui and hawaii county.

In the longer range forecast (Friday through Sunday), models are
showing a more typical easterly trade wind weather pattern. An
upper level 500 mb ridge will build over the state producing
stronger subsidence aloft and a lower trade wind inversion height
around 5000 to 6000 feet. This stronger subsidence aloft will not
allow cloud heights to become deep enough for sustained rain
shower activity. Therefore expect drying trends across the state
from Saturday into Sunday. Global weather models are fairly
consistent with these weather pattern changes through Sunday.

In the extended range forecast (next week Monday and Tuesday),
an upper level trough riding through the central pacific on the
polar jet stream will break down the ridge north of the islands
potentially weakening the trade winds slightly as another cold
front approaches the state from the northwest. Some model
differences remain between the american (gfs) and european
(ecmwf) models during this time period associated with how the
subtropical ridge interacts with the approaching cold front.

However, that said, both models agree that the next cold front
will likely track north of the islands. Meanwhile, a weak upper
level trough may drift into the big island from the southeast on
Tuesday possibly enhancing moisture levels, clouds, and showers.

Aviation
Enhanced moisture associated with an approaching weak cold front
continues to push southeast over the western islands. Sct bkn low
cloud bases are between 2000-4000 ft msl and tops layered to near
10000 ft msl. Scattered showers will persist mainly along the
windward slopes, which could bring periodic MVFR conditions. The
front is forecast to reach the big island by late morning on
Wednesday with drier air and isolated showers filling in behind.

Airmet sierra is in effect for the mountain slopes of kauai.

Windward slopes of oahu, maui and molokai may need to be added as
the front draws to the islands.

Airmet tango in effect for the southern portions of kauai due to
strong northern breezes producing tempo moderate turbulence.

The southwest slopes and coasts of oahu, maui and molokai may
need to be added as breezy north northeast winds increase behind
the front.

Marine
The leading edge of a cold front has passed through kauai and will
begin to impact oahu this evening. North winds of 25 to 30 knots
were observed near the kauai waters earlier today and is expected
to impact the waters near oahu and maui county later tonight. The
cold front is then expected to hang up in the vicinity of the big
island on Wednesday. A small craft advisory (sca) is in effect
for all hawaiian waters through Wednesday night due to the strong
northerly winds with the front and seas greater than 10 feet from
the large northwest swell. High pressure will return well to the
north of the islands Wednesday through early next week, with winds
returning to a more typical east-northeasterly trade wind
direction late Wednesday and Wednesday night. Moderate to locally
strong trades will then continue Thursday through early next week.

The large long-period northwest swell will peak this evening
through tonight and hold through Wednesday morning. Latest buoy
readings at NOAA buoys 51001 and 51101 is indicating the swell is
in line with guidance and warning level surf should continue
through Wednesday morning. Surf should gradually begin to decrease
Wednesday afternoon. Additionally, the peak of the surf is
expected to occur during the pre-dawn hours on Wednesday near the
peak of the spring high tides. This is expected to result in above
average coastal wave run-up, increasing the risk for significant
beach erosion and possibly leading to some minor overwash onto
coastal roadways.

Surf is expected to drop below the winter time average along
north and west facing shores Friday through the weekend. A new
small to moderate northwest swell will be possible early next
week.

Hfo watches warnings advisories
Wind advisory until 8 am hst Wednesday for niihau-kauai leeward-
kauai mountains.

High surf warning until 6 pm hst Wednesday for niihau-kauai
windward-kauai leeward-waianae coast-oahu north shore-oahu
koolau-molokai-maui windward west-maui central valley-windward
haleakala.

Wind advisory from 5 am to 10 pm hst Wednesday for lanai-
kahoolawe-maui central valley-south big island-big island north
and east-kohala.

High surf advisory until 6 pm hst Wednesday for big island north
and east.

Small craft advisory until 6 am hst Thursday for all hawaiian
waters-
discussion... Bohlin
aviation... Jt
marine... Kino


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 30 mi37 min WNW 8 G 9.9 77°F 79°F1016.4 hPa
ILOH1 - 1617760 - Hilo, HI 49 mi43 min NNE 4.1 G 5.1 76°F 77°F1015.6 hPa
KLIH1 - 1615680 - Kahului Bay, Maui, HI 93 mi37 min NNW 14 G 17 75°F 1017 hPa

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI3 mi68 minNW 910.00 miPartly Cloudy79°F61°F54%1015.9 hPa

Wind History from HKO (wind in knots)
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Last 24hrSW3CalmSE3E3E3NE3E33CalmSE4E5E4E3E6NE3CalmW3W7W11W5W8W10NW9NW8
1 day agoN6NW6N8CalmS6SE5SE6SE5E6E5E5E4E6E3E4Calm35W6W8W9W7W7W3
2 days agoNE13
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Tide / Current Tables for Kailua Kona, Big Island, Hawaii (2)
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Kailua Kona
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Tue -- 01:00 AM HST     1.83 feet High Tide
Tue -- 02:51 AM HST     Moonset
Tue -- 06:52 AM HST     Sunrise
Tue -- 07:22 AM HST     0.65 feet Low Tide
Tue -- 12:00 PM HST     1.22 feet High Tide
Tue -- 02:51 PM HST     Moonrise
Tue -- 05:49 PM HST     Sunset
Tue -- 06:25 PM HST     -0.06 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.71.81.81.51.310.80.70.70.811.21.21.210.70.40.1-0-00.20.511.4

Tide / Current Tables for Napoopoo, Kealakekua Bay, Hawaii Island, Hawaii
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Napoopoo
Click for Map
Tue -- 01:10 AM HST     1.83 feet High Tide
Tue -- 02:50 AM HST     Moonset
Tue -- 06:51 AM HST     Sunrise
Tue -- 07:32 AM HST     0.65 feet Low Tide
Tue -- 12:10 PM HST     1.22 feet High Tide
Tue -- 02:51 PM HST     Moonrise
Tue -- 05:49 PM HST     Sunset
Tue -- 06:35 PM HST     -0.06 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.71.81.81.61.310.80.70.70.811.11.21.210.70.40.1-0-00.10.50.91.4

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 (22,6,7,8)
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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.