Saturday, March25, 2017 L-36.com


Marine Weather and Tides
Captain Cook, HI

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:17AMSunset 6:34PM Saturday March 25, 2017 1:35 AM HST (11:35 UTC) Moonrise 4:44AMMoonset 4:40PM Illumination 5% Phase: Waning Crescent; Moon at 27 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 Fri Mar 24 2017
.small craft advisory in effect through Sunday afternoon...
Rest of tonight..Winds variable less than 10 kt west of the big island...east to 25 kt near south point. Wind waves 6 ft. Northwest swell 3 ft. Isolated showers early in the evening. Haze through the night.
Saturday..Winds variable less than 10 kt west of the big island...east to 25 kt near south point. Wind waves 7 ft. Northwest swell 4 ft. Haze.
Saturday night..Winds variable less than 10 kt west of the big island...east to 25 kt near south point. Wind waves 8 ft. Northwest swell 6 ft. Haze. Isolated showers.
Sunday..West winds 10 kt west of the big island...east to 25 kt near south point. Wind waves 8 ft. Northwest swell 8 ft. Haze. Isolated showers.
Sunday night..Winds variable less than 10 kt west of the big island...east to 25 kt near south point. Wind waves 7 ft. Northwest swell 8 ft. Haze through the night. Scattered showers in the evening. Isolated showers after midnight.
Monday..Winds variable less than 10 kt west of the big island... East to 25 kt near south point. Wind waves 7 ft. Northwest swell 7 ft. Haze. Isolated showers.
Monday night..Winds variable less than 10 kt west of the big island...east to 25 kt near south point. Wind waves 6 ft. Northwest swell 6 ft. Haze through the night. Scattered showers in the evening. Isolated showers after midnight.
Tuesday..Winds variable less than 10 kt west of the big island...east to 25 kt near south point. Wind waves 9 ft. Northwest swell 5 to 6 ft. Haze. Isolated showers.
Wednesday..Winds variable less than 10 kt west of the big island...east to 25 kt near south point. Wind waves 9 ft. Northwest swell 5 to 6 ft. Haze. Isolated showers.
PHZ100 906 Pm Hst Fri Mar 24 2017
Synopsis for hawaiian coastal waters.. High pressure northeast of the state will strengthen over the next few days...providing a boost to trade winds through the weekend. Winds will ease slightly early next week as the high moves further from the state. A large west-northwest swell is expected to peak late Saturday into Sunday.

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 250651 cca
afdhfo
area forecast discussion
national weather service honolulu hi
848 pm hst Fri mar 24 2017

Synopsis
Trade winds will prevail through the week, with a slight increase
into the locally breezy range expected during the next couple of
days. Trade winds will focus clouds and showers along windward
slopes, especially at night and in the mornings. An area of moisture
will move west of the islands tonight, leading to a decrease in
humidity.

Discussion
A surface ridge extending east to west along 28n, to the north of
the main hawaiian islands, keeps moderate to locally strong
easterly trade winds blowing across local waters this evening.

Remnant moisture from an old frontal boundary has passed west of
the islands for the most part, leaving a typical trade wind
weather pattern of clouds and showers locally. Earlier deep
convection across interior sections of the big island has subsided
as evening cooling set in.

Satellite loop shows low clouds lingering mainly across windward
shores and slopes of the smaller islands. Low clouds persist
across all lower slopes on the big island. However, we expect big
island cloud cover will decrease as the evening wears on,
especially across leeward areas. Radar shows minimal shower
activity, mainly across windward maui and across local waters 40
miles or more lee of maui and lanai.

Models show the ridge will remain north of the islands through the
forecast period, with no areas of enhanced moisture or disturbed
weather expected through the weekend and into early next week.

A 1026 mb high will move west along the ridge tonight and
Saturday, tightening the pressure gradient a bit across the
islands and causing trades to increase Saturday across the
eastern half of the main island chain. Clouds and showers will
favor windward and mauka areas, with leeward areas of the big
island expected to cloud up each afternoon and evening, then
clearing each night. Deep troughing forecast during the middle of
next week west of 170w will weaken the pressure gradient across
the islands, causing trade winds to decrease slightly from next
Tuesday onwards. The next area of enhanced moisture could lead to
an uptick in windward rainfall on Tuesday or Wednesday, as ridging
aloft is eroded by a trough skirting by to the north.

Aviation
Lingering clouds and showers will continue to impact mostly the
windward sides of the islands overnight. Increasing trade winds on
Saturday will help to push this moisture out of the area. Airmet
sierra continues for mountain obscuration over the windward sides
of all the islands through 08z. With clouds starting to thin, will
likely be able to drop the airmet for all islands by 08z or
shortly thereafter.

As trade winds strengthen Saturday, airmet tango may be issued
for moderate turbulence leeward of the mountains.

Marine
A large incoming west-northwest swell is forecast to arrive at
the far northwest buoys (51001/51101) overnight and near the
islands on Saturday. Surf near kauai is expected to reach warning
levels (25 ft north/20 ft west) by Saturday afternoon before
peaking Saturday night. Warning level surf should continue through
the day Sunday, before gradually subsiding early next week. The
more westerly direction of the swell will cause kauai to shadow
the other smaller islands. The current forecast holds surf for
exposed north and west facing shores of oahu and maui county just
under warning levels. This will be monitored as observations start
coming in from the northwest buoys, and a slightly larger or more
northwest swell could bring warning level surf to those areas as
well. Surf along west facing shores of the big island is also
forecast to reach advisory level (8 ft) and possibly up to warning
level (12 ft) level surf late Saturday into Monday. There
continues to be about a 12 hour timing difference between the
faster wave watch iii and the slower ECMWF wave model. The current
forecast will continue to follow the faster wave watch iii, but
we will wait to issue any advisories or warnings until we start to
see the initial forerunners arrive at the northwest buoys late
tonight.

Otherwise, small long period south swells will continue through
this weekend and into next week, with a slightly larger long
period south swell forecast for Wednesday night through Friday.

Another large west-northwest swell will be possible from next
Friday into the following weekend.

A small craft advisory (sca) is posted for the typically windier
waters around the big island and maui county. High pressure
strengthening northeast of the state will provide locally breezy
conditions through the weekend. The SCA will very likely be
expanded to cover the remaining waters on Saturday, as seas build
above 10 ft due to the large incoming west-northwest swell.

Hfo watches/warnings/advisories
Small craft advisory until 6 pm hst Sunday for maalaea bay-
pailolo channel-alenuihaha channel-big island leeward waters-big
island southeast waters.

Discussion... Powell
aviation... M ballard
marine... Jacobson


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 40 mi47 min NE 4.1 G 6 1021.5 hPa
ILOH1 - 1617760 - Hilo, HI 51 mi47 min SSW 5.1 G 8 68°F 76°F1022.7 hPa

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI13 mi42 minS 910.00 miPartly Cloudy77°F69°F77%1021.1 hPa

Wind History from HKO (wind in knots)
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Last 24hrSE6E5E4NE3NE6NE12N10N11NW11NW11NW9W7SW10S10S14S14S12SE10S10SE11SE7E4S8S9
1 day agoE3E5E6E6E7E6CalmSW5W8NW11NW10W6SW9SW10SW8W8W7W6W5CalmS4S5SE6SE7
2 days agoNE6NE4CalmCalmE3SE4SE7S8S10SW9SW9SW10W9W8SW9SW8S7S8S8SE7SE8E6E6E6

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
Click for Map
Sat -- 02:04 AM HST     1.92 feet High Tide
Sat -- 04:44 AM HST     Moonrise
Sat -- 06:23 AM HST     Sunrise
Sat -- 08:42 AM HST     -0.00 feet Low Tide
Sat -- 02:27 PM HST     1.30 feet High Tide
Sat -- 04:40 PM HST     Moonset
Sat -- 06:36 PM HST     Sunset
Sat -- 08:17 PM HST     0.01 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.51.81.91.81.51.10.70.30.100.20.50.81.11.31.31.10.80.50.200.10.30.7

Tide / Current Tables for Kailua Kona, Hawaii Island, Hawaii
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Kailua Kona
Click for Map
Sat -- 02:19 AM HST     1.89 feet High Tide
Sat -- 04:44 AM HST     Moonrise
Sat -- 06:23 AM HST     Sunrise
Sat -- 08:42 AM HST     0.05 feet Low Tide
Sat -- 02:26 PM HST     1.40 feet High Tide
Sat -- 04:40 PM HST     Moonset
Sat -- 06:36 PM HST     Sunset
Sat -- 08:23 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
1.41.71.91.81.61.20.70.40.10.10.20.50.91.21.41.41.20.80.40.1-0.1-0.10.20.6

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 (7,2,3,4)
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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.