Wednesday, October18, 2017 L-36.com


Marine Weather and Tides
Captain Cook, HI

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
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.

Sunrise 6:15AMSunset 5:55PM Wednesday October 18, 2017 1:57 PM HST (23:57 UTC) Moonrise 5:26AMMoonset 5:42PM Illumination 2% Phase: Waning Crescent; Moon at 28 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- 939 Am Hst Wed Oct 18 2017
.small craft advisory in effect through Thursday afternoon...
Rest of today..West of the big island, east winds 10 knots veering southwest in the afternoon. NEar south point, east winds to 30 knots. Wind waves 12 feet. Isolated showers. Haze through the day.
Tonight..South winds 10 knots west of the big island...east to 30 knots near south point. Wind waves 11 feet. Haze through the night. Isolated showers through the night.
Thursday..Southwest winds 10 knots west of the big island... Northeast to 30 knots near south point. Wind waves 10 feet. Isolated showers in the morning. Haze through the day.
Thursday night..Southeast winds 10 knots west of the big island...northeast to 25 knots near south point. Wind waves 9 feet. Haze through the night. 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 11 feet. Isolated showers in the morning. Haze through the day.
Friday night..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 in the evening. Haze through the night. Isolated showers through the night.
Saturday..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 8 feet. Haze. Isolated showers.
Sunday..West of the big island, north winds 10 knots in the morning becoming variable less than 10 knots. NEar south point, east winds 15 knots. Wind waves 5 feet. Northwest swell 3 to 4 feet. Haze. Scattered showers.
PHZ100 939 Am Hst Wed Oct 18 2017
Synopsis for hawaiian coastal waters.. Strong high pressure will remain north of the waters through Thursday, then weaken and shift eastward over the weekend as a front approaches from the northwest.

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 181956
afdhfo
area forecast discussion
national weather service honolulu hi
956 am hst Wed oct 18 2017

Synopsis
High pressure north of hawaii will keep a windy trade wind
pattern in place through the rest of the work week, with the
trades trending down slightly Friday and weakening further over
the weekend. Clouds and showers will favor windward and mauka
areas through the period, but showers will reach leeward areas
from time to time as well due to the strength of the trades.

Discussion
Windy conditions continue due to high pressure north of the state.

Overnight the surface analysis depicted at 1034 mb high about 1500
miles north northwest of oahu. There is good model agreement with
the high slowing moving towards 30n over the next couple of days,
and weakening to around 1030 mb. The resultant pressure gradient
over the islands is producing locally strong gusts which exceed
our wind advisory criteria. The wind advisory continues today for
areas around maui county and the big island. This advisory will
likely be extended through tomorrow, but will be examining the
wind observations today to make the final determination.

Showers riding in on the trade will continue to be focused over
windward and mauka areas, however the winds will be strong enough
to carry a few showers to leeward areas. Rain totals are expected
to remain on the light side.

As we head into the weekend, the high moves to the east, and the
pressure gradient over the islands begins to weaken. By Sunday, a
trough pushes in to the northwest of the island, which should turn
the winds to a southeasterly direction. By Monday as the trough
moves closer, the winds could turn more southerly. Additional
moisture is expected to spread over the islands in this southeast
and southerly flow. As the winds shift, they will also weaken,
allowing for some afternoon sea breezes to become established. An
upper level trough is expected to pass just north of hawaii
Monday through Tuesday night resulting in some possibly heavier
showers.

Aviation
Expect another day of strong and gusty trade winds. The
combination of the elevated trade winds and strong low level
inversions (sloping from 8 kft at phli to 10 kft at phto) will
continue to support at least tempo moderate low level turbulence.

Airmet tango is posted across the state for low level turbulence.

This is expected to stay posted into tomorrow.

Scattered showers embedded in the trade winds will stream over the
state. Most clouds and showers will favor the windward and
mountain areas, but some showers will make it to the leeward areas
under the strong trades. Expect primarilyVFR conditions, with
brief MVFR CIGS vis is passing showers. Showers are not expected
to be widespread enough to warrant the need for a mountain
obscuration today.

Airmet tango is also posted for upper level turbulence between
fl250 and fl400 due to a jet stream in the vicinity of the
islands.

Marine
Hazardous marine conditions will continue through Friday due to
strong-to gale-force trade winds and rough seas. Latest buoy
observations are holding within the 8 to 11 ft range, with
heights up to 15 ft likely over the windier locations, especially
the pailolo and alenuihaha channels and waters south of the big
island. Satellite altimetry data within the past 12 hrs even
showed wave heights up to 14 ft west of kauai. Gale conditions
will likely hold over the pailolo and alenuihaha channels through
the day Thursday, with small craft advisory conditions continuing
over most waters through Friday.

The latest guidance depicts a weakness developing within the
ridge north of the islands over the upcoming weekend in response
to a frontal boundary approaching from the northwest and a weak
surface trough approaching from the east. Trade winds are forecast
to respond and gradually trend down late Saturday through Sunday.

Seas will drop below advisory levels (10 ft) through this time.

Surf along east facing shores will remain rough through the rest of
the week due to strong trades locally and upstream of the islands.

The high surf advisory for east facing shores has been extended
through Thursday. A downward trend is expected over the upcoming
weekend due to the weakening ridge and a weak trough moving into
the area from the east.

Surf along south facing shores will continue to trend down through
Thursday as the current south swell eases. Mostly shorter-period
and small southeast energy is expected through Friday. An upward
trend is expected once again this weekend with wavewatch iii and
ecmwf-wave solutions showing long-period energy arriving locally
by Saturday (200 deg), peaking Sunday, then slowly trending down
early next week.

Mainly trade wind energy wrapping into the typical locations is
expected for surf along north facing shores into Thursday. A long-
period north-northwest (340 deg) swell is expected to fill in and
peak late Thursday through Friday below advisory level before
slowly easing into the upcoming weekend. A larger, long-period
northwest swell (320 deg) is expected to build Sunday,
potentially producing advisory level surf for north and west
facing shores early next week.

Fire weather
The kbdi at honolulu is at 576 as of this morning, which is still
below the 600 critical threshold. Gusty winds are expected to
continue with low afternoon relative humidity. This will keep us
below levels for a red flag warning. That being said, some
leeward areas across the state may already be experiencing
critically dry conditions. The combination of dry and windy
conditions in the afternoons is expected to remain through the
work week, before winds ease and humidities rise somewhat over the
weekend.

Hfo watches warnings advisories
High surf advisory until 6 pm hst Thursday for kauai windward-
oahu koolau-olomana-molokai windward-maui windward west-windward
haleakala-south big island-big island north and east.

Wind advisory until 6 pm hst this evening for lanai-kahoolawe-
big island north and east-kohala.

Small craft advisory until 6 pm hst Thursday for kauai northwest
waters-kauai windward waters-kauai leeward waters-kauai channel-
oahu windward waters-oahu leeward waters-kaiwi channel-maui
county windward waters-maui county leeward waters-maalaea bay-
big island windward waters-big island leeward waters-big island
southeast waters.

Gale warning until 6 pm hst Thursday for pailolo channel-
alenuihaha channel.

Discussion... M ballard
aviation... Eaton
marine... Ts


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 40 mi40 min WSW 11 G 12 83°F 80°F1014.8 hPa
ILOH1 - 1617760 - Hilo, HI 51 mi40 min N 15 G 17 75°F 78°F1018.1 hPa

Wind History for Kawaihae, HI
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NE14
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NE27
G36
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G39

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI13 mi65 minSW 1310.00 miPartly Cloudy87°F64°F46%1015.6 hPa

Wind History from HKO (wind in knots)
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Last 24hrS9S8S10SE8SE7S8NE5E8S3CalmNE7N8SE4NE9N6N17
G21
NE8CalmSE4S7S8SW7SW13SW13
1 day agoS10S12S12SE10SE9SE9NE6NE6CalmN10NE4NE9NE7NW6N9SE6N4NE7CalmCalmW3S9SW7S14
2 days agoS11S10SW10S9SE11SE9SE8NE6NE6NE8NE5SE11
G18
E7CalmE5NE5E5NE9E5S4SW7SW7S10SW9

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
Click for Map
Wed -- 02:54 AM HST     1.88 feet High Tide
Wed -- 05:26 AM HST     Moonrise
Wed -- 06:19 AM HST     Sunrise
Wed -- 09:01 AM HST     0.37 feet Low Tide
Wed -- 02:48 PM HST     1.69 feet High Tide
Wed -- 05:41 PM HST     Moonset
Wed -- 05:58 PM HST     Sunset
Wed -- 09:00 PM HST     0.11 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.11.51.81.91.81.51.10.70.50.40.50.71.11.41.61.71.61.30.90.50.20.10.20.5

Tide / Current Tables for Kailua Kona, Hawaii Island, Hawaii
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Kailua Kona
Click for Map
Wed -- 02:56 AM HST     1.93 feet High Tide
Wed -- 05:26 AM HST     Moonrise
Wed -- 06:19 AM HST     Sunrise
Wed -- 08:55 AM HST     0.26 feet Low Tide
Wed -- 02:50 PM HST     1.86 feet High Tide
Wed -- 05:41 PM HST     Moonset
Wed -- 05:58 PM HST     Sunset
Wed -- 09:04 PM HST     -0.02 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.11.51.81.91.81.51.10.60.40.30.40.71.11.51.81.91.71.40.90.50.1-00.10.4

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 (19,4,5,8)
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Ground Weather Radar Station South Shore, 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.