Tuesday, December18, 2018 L-36.com


Marine Weather and Tides
Urban Honolulu, 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 7:02AMSunset 5:54PM Tuesday December 18, 2018 5:58 PM HST (03:58 UTC) Moonrise 2:58PMMoonset 3:00AM 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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PHZ116 Kaiwi Channel- 344 Pm Hst Tue Dec 18 2018
.small craft advisory in effect through early Thursday morning...
Tonight..Northeast winds to 25 knots. Wind waves 6 feet. Northwest swell 12 feet. Scattered showers.
Wednesday..Northeast winds to 25 knots. Wind waves 9 feet. Northwest swell 12 feet. Scattered showers in the morning.
Wednesday night..Northeast winds 20 knots. Wind waves 8 feet. Northwest swell 10 feet.
Thursday..Northeast winds 20 knots. Wind waves 6 feet. North swell 8 feet.
Thursday night..East winds 20 knots. Wind waves 6 feet. North swell 7 feet. Isolated showers after midnight.
Friday..East winds 15 knots. Wind waves 6 feet. North swell 6 feet. Isolated showers in the morning.
Friday night..East winds 20 knots. Wind waves 5 feet. North swell 5 feet. Isolated showers after midnight.
Saturday..East winds 20 knots. Wind waves 5 to 6 feet. Northwest swell 5 feet. Isolated showers.
Sunday..East winds 20 knots. Wind waves 7 feet. Northwest swell 4 to 5 feet. Isolated showers.
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 Urban Honolulu, HI
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location: 21.29, -157.88     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
OOUH1 - 1612340 - Honolulu, HI 1 mi65 min N 4.1 G 8 74°F 76°F1017.2 hPa
51211 4 mi59 min 78°F2 ft
MOKH1 - 1612480 - Mokuoloe, HI 11 mi83 min NNW 12 G 14 74°F 75°F1017.8 hPa
51212 14 mi59 min 78°F6 ft
51210 14 mi59 min 77°F6 ft
51202 - Mokapu Point, HI (098) 14 mi59 min 77°F7 ft
51207 15 mi65 min 77°F6 ft
51201 - Waimea Bay, HI (106) 29 mi47 min 74°F10 ft

Wind History for Honolulu, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Daniel K Inouye International Airport, HI5 mi66 minN 1010.00 miPartly Cloudy75°F64°F69%1017.3 hPa
Oahu, Kalaeloa Airport, HI10 mi66 minVar 510.00 miOvercast75°F61°F62%1018.3 hPa
Kaneohe, Marine Corps Air Station, HI12 mi2 hrsN 1510.00 miMostly Cloudy74°F66°F79%1016.2 hPa
Wheeler Air Force Base / Oahu, HI15 mi63 minN 11 G 1810.00 miLight Rain70°F63°F80%1017.4 hPa

Wind History from HNL (wind in knots)
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Last 24hrNE12NE5NE6NW5NW5NW7NW5N4NW5NW3NW4Calm4N84NW6W4SW7NW11
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1 day agoNE10NE7NE12NE7NE5NE9NE6NE4E5N3CalmCalmNE7NE6NE6NE9E13E9
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Tide / Current Tables for Honolulu, Oahu (Hawaii) (2) (expired 1989-12-31)
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Honolulu
Click for Map
Tue -- 01:30 AM HST     1.71 feet High Tide
Tue -- 02:59 AM HST     Moonset
Tue -- 07:02 AM HST     Sunrise
Tue -- 07:52 AM HST     0.58 feet Low Tide
Tue -- 12:35 PM HST     1.06 feet High Tide
Tue -- 02:57 PM HST     Moonrise
Tue -- 05:53 PM HST     Sunset
Tue -- 06:52 PM HST     -0.10 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.51.71.71.51.310.80.60.60.60.80.9110.90.70.40.2-0-0.100.30.71.1

Tide / Current Tables for Waimanalo, Oahu Island, Hawaii
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Waimanalo
Click for Map
Tue -- 12:11 AM HST     1.47 feet High Tide
Tue -- 02:59 AM HST     Moonset
Tue -- 06:35 AM HST     0.55 feet Low Tide
Tue -- 07:02 AM HST     Sunrise
Tue -- 11:11 AM HST     0.96 feet High Tide
Tue -- 02:57 PM HST     Moonrise
Tue -- 05:38 PM HST     -0.06 feet Low Tide
Tue -- 05:52 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.51.41.31.10.90.70.60.60.60.80.910.90.80.60.30.1-0-00.10.40.71.11.4

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 Molokai, 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.