Thursday, December13, 2018 L-36.com


Marine Weather and Tides
Captain Cook, 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 6:45AMSunset 5:44PM Thursday December 13, 2018 12:57 PM HST (22:57 UTC) Moonrise 11:43AMMoonset 11:28PM Illumination 38% Phase: Waxing Crescent; Moon at 6 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- 1213 Pm Hst Thu Dec 13 2018
.small craft advisory in effect through Friday afternoon...
Rest of today..South winds 10 knots west of the big island... East to 30 knots near south point. Wind waves 10 feet. Northwest swell 4 feet. Isolated showers.
Tonight..Winds variable less than 10 knots west of the big island...east to 30 knots near south point. Wind waves 11 feet. Northwest swell 4 feet. Isolated showers through the night.
Friday..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 10 feet. Northwest swell 3 feet.
Friday night..Winds variable less than 10 knots west of the big island...northeast to 25 knots near south point. Wind waves 10 feet. Northwest swell 3 feet.
Saturday..West of the big island, winds variable less than 10 knots becoming northwest 10 knots in the afternoon. NEar south point, east winds 20 knots. Wind waves 10 feet. Northwest swell 3 feet.
Saturday night..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 9 feet. Northwest swell 5 feet increasing to 7 feet after midnight.
Sunday..West of the big island, winds variable less than 10 knots becoming northwest 10 knots in the afternoon, then becoming variable less than 10 knots. NEar south point, east winds 20 knots. Wind waves 7 to 9 feet. Northwest swell 7 feet.
Monday..West of the big island, winds variable less than 10 knots becoming northwest 10 knots in the afternoon and evening, then becoming variable less than 10 knots after midnight. NEar south point, east winds 10 knots. Wind waves 5 to 6 feet. Northwest swell 6 to 7 feet. Isolated showers.
PHZ100 1213 Pm Hst Thu Dec 13 2018
Synopsis for hawaiian coastal waters.. Strong trade winds will persist as robust high pressure remains north of the area through Friday. The high will weaken and drift south over the weekend, resulting in a gradual easing of the trades.


7 Day Forecast for Marine Location Near Captain Cook, HI
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location: 19.46, -155.96     debug


Area Discussion for -
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Fxhw60 phfo 132226 aaa
afdhfo
area forecast discussion
national weather service honolulu hi
1226 pm hst Thu dec 13 2018

Update
Winds have been increased slightly based on surface observations,
necessitating a wind advisory for pats of the big island, maui,
and lanai. The strongest wind gusts will occur over and downwind
of terrain. The gusty winds supporting the advisory will persist
through the first half of tonight. A gale warning has also been
posted for the alenuihaha channel through midnight.

Note that the radar returns currently observed over kauai and near
oahu are not due to rainfall.

Synopsis
Another round of breezy and gusty trade winds is in store today
and tonight as strong high pressure passes north of the islands.

Winds will gradually decrease Friday through Monday. A stable
pattern of mainly windward and mauka showers will prevail through
Monday, providing dry conditions for most leeward areas. A front
is expected to move down the island chain during the middle of
next week, bringing an increase in showers and a brief period of
breezy northeasterly trade winds.

Prev discussion issued 950 am hst Thu dec 13 2018
another round of breezy and gusty trades is developing. A 1030 mb
surface high is currently located about 800 miles north of the
state, and winds at most island stations are similar to or
slightly stronger than reports from this time yesterday. As the
high drifts closer to the state today, expect a further increase
in the trades. A strong mid-level ridge will continue to build
overhead, and the inversion, currently observed between 3,500 to
7,500 ft, will strengthen and possibly lower. As the inversion
settles near mountainous terrain of the islands, strong wind gusts
may develop this afternoon and into tonight over and downwind of
the terrain on all islands. We will have to monitor closely, as a
wind advisory could be needed later today.

A stable pattern of mainly windward rainfall is due today. Small
pockets of moisture are currently affecting windward portions of
most islands. Expect upwards of a half inch of rainfall over
parts of these islands today, mainly on the big island, followed
by a downward trend tonight. Leeward areas will be mainly dry
today.

A gradual decrease in trade winds is due for Friday into Monday,
while stable conditions and precipitable water values well below
an inch lead to modest rainfall over windward slopes. The surface
high will weaken and settle around 300 miles north of kauai during
the weekend. Trades will drop to moderate to breezy levels on
Friday, then slowly decline further through the weekend. The
strong mid-level ridge will remain overhead, maintaining very
stable conditions, and with precipitable water values dropping to
around 3 4 of an inch, light shower activity is expected to be
confined to windward slopes, while dry conditions dominate over
leeward areas.

A shallow front is expected to move across the state during the
middle of next week, bringing an increase in showers and a brief
period of breezy northeasterly trade winds. At this time, the gfs
and ECMWF remain in remarkably good agreement in showing the front
reaching kauai late Tuesday, then moving down the island chain
through Wednesday. Since the front will be shallow and moving
somewhat quickly, excessive rainfall is not expected.

Aviation
A cell of high pressure north of hawaii will maintain a tight
pressure gradient across the region today which should continue
the breezy trade wind pattern. Airmet tango remains in effect
through this afternoon all areas below 9000 feet msl south and
west of the mountain ranges due to expected tempo moderate
turbulence.

Low clouds with bases around 2500 ft msl and tops 7000-9000 ft
will push towards the islands today from the northeast and bring
light to moderate showers. This activity may bring brief MVFR
conditions to these areas due to lowered vis and mountain
obscuration. Airmet sierra will be if effect though at least 22z
for mountain obscuration on the windward slopes of the big island.

Marine
Strong to near gale strength trade winds will return today and
tonight as a building high passes north of the area. The high
will weaken as it settles slowly south Friday through early next
week, gradually weakening the trades. A small craft advisory (sca)
remains in effect for all hawaiian coastal waters through Friday
due to a combination of strong winds and rough seas. However, we
will closely monitor for possible gale conditions across the
typically windy waters around the big island and maui.

The current northwest swell will gradually subside today, followed
by a smaller northwest swell tonight through Saturday. A large
northwest swell will build late Saturday and peak late Saturday
night and Sunday, likely producing warning level surf along north
and west facing shores. Another, even larger, northwest swell is
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.

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

Hfo watches warnings advisories
Wind advisory until midnight hst tonight for the big island, maui
and lanai.

High surf advisory until 6 pm hst Friday for east facing shores
of kauai, oahu, molokai, maui, and the big island.

Gale warning until midnight hst tonight for alenuihaha channel.

Small craft advisory until 6 pm hst Friday for all remaining
waters.

Discussion... Wroe
aviation... Jt
marine... mballard


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 40 mi45 min WSW 17 G 22 82°F 79°F1017.3 hPa
ILOH1 - 1617760 - Hilo, HI 51 mi57 min NE 11 G 14 76°F 77°F1021 hPa (-1.2)

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI13 mi64 minSSW 1010.00 miMostly Cloudy80°F66°F62%1018.9 hPa

Wind History from HKO (wind in knots)
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Last 24hrSW7SW7W8W8W5W5SE5E6E4E3NE4SE8E3E3E8E9E7E7NE6N6S84W8SW10
1 day agoSW10SW10S8SW96SW4NW5NE7SE11SE10SE10SE10SE8E8E8E5NE5E3E4E5SE4S8SW6W7
2 days agoS9SW9S9W8CalmNE19
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SE6SE9E5E9E6E9SE6SE9SE9SE6SE10E6E5E6SE4W5W6SW9

Tide / Current Tables for Napoopoo, Kealakekua Bay, Hawaii Island, Hawaii
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Napoopoo
Click for Map
Thu -- 12:20 AM HST     0.55 feet Low Tide
Thu -- 06:48 AM HST     Sunrise
Thu -- 07:55 AM HST     1.89 feet High Tide
Thu -- 11:42 AM HST     Moonrise
Thu -- 03:49 PM HST     0.26 feet Low Tide
Thu -- 05:47 PM HST     Sunset
Thu -- 09:54 PM HST     0.94 feet High Tide
Thu -- 11:28 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.60.70.91.11.41.71.81.91.81.61.310.70.40.30.30.30.50.70.80.90.90.9

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
Click for Map
Thu -- 12:20 AM HST     0.52 feet Low Tide
Thu -- 06:49 AM HST     Sunrise
Thu -- 07:46 AM HST     1.87 feet High Tide
Thu -- 11:42 AM HST     Moonrise
Thu -- 03:30 PM HST     0.21 feet Low Tide
Thu -- 05:47 PM HST     Sunset
Thu -- 09:26 PM HST     0.88 feet High Tide
Thu -- 11:28 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.50.60.81.11.41.71.81.91.81.51.20.90.60.30.20.20.30.50.70.80.90.90.8

Weather Map and Satellite Images
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wmap_P
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 (17,4,5,8)
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Ground Weather Radar Station South Shore, 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.