Monday, December11, 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 6:43AMSunset 5:43PM Sunday December 10, 2017 11:23 PM HST (09:23 UTC) Moonrise 12:25AMMoonset 1:03PM Illumination 46% Phase: Third Quarter Moon; Moon at 23 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- 906 Pm Hst Sun Dec 10 2017
Rest of tonight..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 3 feet. Northwest swell 6 feet. Haze.
Monday..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 3 feet. Northwest swell 6 feet. Haze.
Monday night..Southeast winds 10 knots. Wind waves 2 feet or less. Northwest swell 5 feet. Haze.
Tuesday..Winds variable less than 10 knots becoming northwest 10 knots in the afternoon. Wind waves 2 feet or less then 3 feet in the afternoon. Northwest swell 4 feet. Isolated showers in the morning. Haze through the day.
Tuesday night..North winds 10 knots. Wind waves 4 feet. Northwest swell 6 feet increasing to 8 feet after midnight. Haze. Isolated showers.
Wednesday..North winds 15 knots west of the big island... Northeast 10 knots near south point. Wind waves 6 feet. Northwest swell 9 feet. Isolated showers through the day.
Wednesday night..West of the big island, northeast winds 15 knots. NEar south point, northeast winds 10 knots in the evening becoming variable less than 10 knots. Wind waves 7 feet. Northwest swell 10 feet. Isolated showers through the night.
Thursday..West of the big island, northeast winds 10 knots. NEar south point, northeast winds 10 knots becoming variable less than 10 knots. Wind waves 6 to 8 feet. Northwest swell 7 to 9 feet. Haze. Scattered showers.
Friday..Northeast winds 10 knots in the morning becoming variable less than 10 knots, then becoming southeast 10 knots after midnight. Wind waves 2 feet or less. North swell 5 to 7 feet. Haze. Scattered showers.
PHZ100 906 Pm Hst Sun Dec 10 2017
Synopsis for hawaiian coastal waters.. The current north-northwest swell will decline overnight and Monday. Another larger swell will arrive Tuesday, then peak Tuesday night into Wednesday. A new front is expected to move down the island chain Tuesday through Wednesday morning, with increasing north to northeast winds behind the front.

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 110647
afdhfo
area forecast discussion
national weather service honolulu hi
847 pm hst Sun dec 10 2017

Synopsis
A cold front located around 600 miles northwest of kauai is forecast
to approach the state through the day Monday, then move down the
island chain Tuesday morning through Wednesday. Winds will remain
light into Monday, then shift out of the southwest and strengthen
Monday night ahead of the front. Breezy north winds will fill in
behind the front Tuesday through Thursday, with unsettled weather
possible from Friday into the following weekend.

Discussion
Satellite imagery and observations showed a band of clouds
associated with a dissipated front that had stalled over the state
today beginning to retreat northward. Showers within this band
remain light with the best coverage located over the windward waters
between molokai and oahu. Overnight, this cloud band will continue
to lift northward as a stronger shortwave trough and its attendant
cold front approach the region. Ahead of this front, winds will
remain light with the background flow shifting from the east
tonight to the southwest late Monday, likely giving way to land
and sea breezes.

The latest hi-res model guidance remains in good agreement Monday
night through midweek and brings this next cold front over kauai
early Tuesday, then east of the state by Wednesday night. A better
source of moisture associated with this next boundary combined with
upper height falls and isentropic ascent will likely translate to
decent rainfall coverage across the state. Model reflectivities
depict pre-frontal showers developing over the northwest islands
late Monday through Monday night, followed by the main band of
showers along the front that should reach kauai by noon Tuesday,
oahu through the afternoon hours, then the rest of the islands
Tuesday night into Wednesday. Another shot of cool and dry air
will fill in (pws down toward half of an inch; dewpoints back into
the mid upper 50s) behind this front Tuesday through Wednesday.

Winds will shift out of the north-northeast and become breezy
Wednesday through Thursday.

After Thursday however, forecast uncertainty increases dramatically
as forecast models have been exhibiting a fair amount of run-to-run
variability, due to the shortwave diving SE toward the islands by
mid-week. The 12z gfs ECMWF cmc indciate that the shortwave will
develop into a cutoff low just E of the islands on Thursday, and
then drift W over the islands Friday and Saturday before gradually
dissipating Sunday and Monday. If this scenario develops, island
weather would become very active, with the potential for heavy rain
and thunderstorms, as well as snowfall and high winds at the big
island summits. However, if the navgem is correct (and now the 18z
gfs) the cutoff would remain E of the islands, and the impacts on
island weather would be significantly less. With confidence in the
large scale weather pattern so diminished, the details of the
forecast are highly uncertain, and no significant changes to the
longer range forecast are expected at this time.

Aviation
Cloud and shower bands are breaking off from an old frontal
boundary over maui county and moving west-northwest tonight ahead
of another cold front approaches the hawaiian islands from the
north. These showers will continue to bring periods of MVFR
conditions to molokai and oahu tonight through Monday morning.

Low cloud and shower bands will bring periods of MVFR conditions
to kauai by Monday afternoon. The next cold front will move in
from the northwest reaching kauai by Tuesday morning.

Vfr will prevail at the terminals on kauai, southwestern oahu,
lanai, maui and the big island tonight and tomorrow morning.

Expect lingering MVFR conditions over molokai and northeastern
oahu this evening.

Airmet sierra for mountain obscuration remains in effect for
molokai and oahu.

Marine
The current large north-northwest swell peaked across the coastal
waters during the afternoon and early evening hours, and is now
beginning to decline. Warning level surf will continue overnight on
the north and west facing shores of the smaller islands exposed
to the surf, with advisory level surf continuing on the north
facing shores of the big island. This swell will continue to
decline through Monday night. Expect the high surf warning to be
downgraded to an advisory by Monday morning. Surf along the north
facing shores of the big island should drop below advisory levels
by Monday morning.

This swell continues to produce seas at or above 10 feet across
exposed waters, and a small craft advisory (sca) remains posted
for most areas. Seas are expected to lower overnight from west to
east. Some windward eastern waters may need to have the sca
extended into Monday morning, depending on how quickly the seas
drop overnight. Will make that decision with the early morning
forecast issuance.

The next north-northwest swell is expected to arrive Tuesday, then
peak Tuesday night into Wednesday. This swell is forecast to be
even larger than the current swell, and is expected to produce
warning-level surf on north and west facing shores of the smaller
islands. Surf on the north facing shores of the big island will
probably reach advisory levels in some areas, but with a lot of
local variations due to the expected 330 degree direction of this
swell. This swell will also bring seas back above 10 feet across
most of the marine area, beginning as early as midday Tuesday for
the far northwest waters, and spreading across the rest of the
area Tuesday night into Wednesday morning.

The next cold front is forecast to move down the island chain
Tuesday through Wednesday morning, with northerly winds
increasing behind the front. Winds behind this front will likely
reach SCA levels across much of the area by Wednesday afternoon or
Wednesday night.

See the latest oahu surf discussion (srdhfo) for additional details
on surf and swell.

Hfo watches warnings advisories
High surf warning until 6 am hst Monday for niihau-kauai
windward-kauai leeward-waianae coast-oahu north shore-oahu
koolau-molokai-maui windward west-maui central valley-windward
haleakala.

High surf advisory until 6 am hst Monday for big island north
and east.

Small craft advisory until 6 am hst Monday 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-alenuihaha
channel-big island windward waters.

Aviation... Bohlin
marine... Jacobson
rest of discussion... Gibbs birchard


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 40 mi54 min NNE 1.9 G 2.9 75°F 78°F1015.2 hPa
ILOH1 - 1617760 - Hilo, HI 51 mi54 min SW 5.1 G 7 68°F 77°F1015.4 hPa

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI13 mi31 minNE 410.00 miFair73°F63°F71%1014.7 hPa

Wind History from HKO (wind in knots)
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Last 24hrE8SE7E7E4E5E6E5E6E4SE4S8S9S10SW7SW8SW10SW8SW8SW7S6CalmNW6NW3NE4
1 day agoSE8SE8SE8SE5E7E7E7E4E4CalmW5W7W6NW15NW10NW10NW8NW11N7N10N8N9NE5E7
2 days agoE4NE4NE6E4E5E6NE6E5NE5N7NW6W7W8NW9W9NW9NW8W6W6W3S4SE5SE6SE8

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
Click for Map
Mon -- 01:18 AM HST     Moonrise
Mon -- 04:48 AM HST     0.73 feet Low Tide
Mon -- 06:48 AM HST     Sunrise
Mon -- 10:27 AM HST     1.50 feet High Tide
Mon -- 01:42 PM HST     Moonset
Mon -- 05:27 PM HST     0.00 feet Low Tide
Mon -- 05:46 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.31.21.10.90.80.70.811.21.41.51.51.31.10.80.40.2000.20.50.81.21.4

Tide / Current Tables for Kailua Kona, Hawaii Island, Hawaii
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Kailua Kona
Click for Map
Mon -- 01:18 AM HST     Moonrise
Mon -- 04:40 AM HST     0.65 feet Low Tide
Mon -- 06:48 AM HST     Sunrise
Mon -- 10:47 AM HST     1.62 feet High Tide
Mon -- 01:42 PM HST     Moonset
Mon -- 05:46 PM HST     Sunset
Mon -- 05:47 PM HST     0.15 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.31.210.80.70.70.70.91.21.41.61.61.51.310.70.40.20.20.30.50.81.11.3

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 (4,6,7,8)
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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.