Saturday, June24, 2017 L-36.com


Marine Weather and Tides
Captain Cook, HI

Version 3.4
What's New / NOTES
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 5:42AMSunset 7:03PM Saturday June 24, 2017 12:29 AM HST (10:29 UTC) Moonrise 6:33AMMoonset 8:02PM Illumination 0% Phase: New Moon; Moon at 0 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- 937 Pm Hst Fri Jun 23 2017
Rest of tonight..Southeast winds 15 knots. Wind waves 3 feet. Southeast swell 3 feet. Haze through the night. Isolated showers through the night.
Saturday..West of the big island, winds variable less than 10 knots becoming west 10 knots in the afternoon. NEar south point, east winds 10 knots. Wind waves 3 feet in the morning then 2 feet or less. Southeast swell 3 feet. Haze through the day. Isolated showers through the day.
Saturday night..Winds variable less than 10 knots west of the big island...east 10 knots near south point. Wind waves 2 feet or less. Southeast swell 3 feet. Haze through the night. Isolated showers in the evening. Scattered showers after midnight.
Sunday..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 3 feet. Southeast swell 3 feet. Haze through the day. Scattered showers in the morning. Isolated showers in the afternoon.
Sunday night..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 4 feet. Southeast swell 3 feet. SWell northeast 3 feet. Haze. Isolated showers.
Monday..West winds 10 knots west of the big island...east 20 knots near south point. Wind waves 5 feet. Mixed swell southeast 3 feet and northeast 3 feet. Isolated showers in the morning. Haze through the day.
Monday night..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 6 feet. Mixed swell southeast 3 feet and northeast 3 feet. Haze through the night. Isolated showers through the night.
Tuesday..West of the big island, west winds 10 knots becoming variable less than 10 knots. NEar south point, east winds 20 knots. Wind waves 6 to 7 feet. Mixed swell southeast 3 feet and northeast 3 feet. Haze. Isolated showers.
Wednesday..West of the big island, northwest winds 10 knots becoming variable less than 10 knots. NEar south point, east winds 20 knots. Wind waves 7 feet. Mixed swell southeast 3 feet and northeast 3 feet. Haze. Isolated showers.
PHZ100 937 Pm Hst Fri Jun 23 2017
Synopsis for hawaiian coastal waters.. Moderate to fresh trade winds will persist through the weekend, as a ridge of high pressure remains far north of the islands. As the high builds northeast of the area early next week, the trades will strengthen to locally strong levels across portions of the coastal waters.

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 240644
afdhfo
area forecast discussion
national weather service honolulu hi
844 pm hst Fri jun 23 2017

Synopsis
A mid level trough will pass over the islands this weekend,
weakening the trade winds and increasing showers across the area.

The mid-level trough will shift west of the state by early next
week, with high pressure then building back northeast of the
islands. This will result in a drier and more stable trade wind
regime, with the trades increasing into the breezy to locally
windy range through much of next week.

Discussion
Currently at the surface, a 1034 mb high centered 1600 miles
north of honolulu is driving moderate trade winds across the
island chain this evening. Infrared satellite imagery shows partly
to mostly cloudy skies in place across the state, with cloud
cover most prevalent over windward areas, as well as leeward
sections of the big island. Radar imagery shows scattered showers
moving into mainly windward areas, with some lingering daytime
shower activity over leeward sections of the big island. Main
short term concern revolves around rain chances.

Tonight through Sunday,
high pressure to the north of the state will track slowly eastward
well to the north of the island chain through the weekend.

Meanwhile, a mid-level (700 mb) trough just to the east of the big
island this evening, will track slowly westward through the
islands Saturday through Sunday. A weak surface reflection in the
form of weak surface troughing, will weaken the trade wind flow
across the islands, resulting in localized sea breezes in the more
sheltered areas each afternoon. Showers will continue to favor
windward and mauka areas through the weekend, but there will
likely be some afternoon shower development in leeward areas due
to the weakened trade wind pattern, with these showers lingering
into the evening hours each day. A few of the showers could be a
bit heavier as a result of the mid-level trough moving overhead,
but no significant flooding issues are anticipated.

Sunday night through next Friday,
the mid-level trough will exit to the west of the state, while
surface high pressure builds to the northeast of the island chain.

This will increase the pressure gradient across the islands,
resulting in strengthening trade winds Sunday night and Monday,
with breezy to locally windy conditions expected Tuesday through
the end of the upcoming work week. In addition to the
strengthening trades, with the exit of the mid-level trough to the
west of the islands, a drier more stable airmass will move into
the area. Precipitable water values will drop into the 1.0 to 1.2
inch range, below normal for this time of year, and this will
result in a drier than normal trade wind shower pattern. Showers
will continue to favor windward and mauka areas, with a stray
shower reaching leeward areas from time to time due to the
strengthening trades. Rainfall amounts are expected to remain
light through the period.

Aviation
Breezy northeast to east trade winds are forecast on
Saturday with a trend towards late morning to afternoon onshore
sea breezes and cloud build ups along western slopes of all
islands. Tempo showers and ceilings with isolated MVFR possible
mainly along north through east slopes and coasts of all islands
no airmet's in effect with none expected.

Marine
Moderate to fresh trade winds associated with 1034 mb high
pressure far north of the state will continue through the
overnight hours, then weaken Saturday and Sunday as the gradient
relaxes. There is a slight chance for some coastal areas to
experience sea breeze conditions through the late morning and
afternoon periods over the weekend, however, confidence in this
potential remains low at this time. Fresh to strong trades are
expected to return through the day Monday and continue through the
remainder of the week. Small craft conditions will become likely
through this period over the typically windier channel waters,
maalaea bay and south of the big island.

Coastal flooding associated with king tides will be a possibility
going into the weekend, especially along south facing shores,
where surf will remain above normal through Saturday. The
greatest potential for coastal flooding impacts will be during the
mid to late afternoon hours Saturday, when highest tides are
expected. Visit tidesandcurrents.Noaa.Gov for more specific
information about forecast tides and water levels in your area.

Tides and surf will lower Sunday into the upcoming week.

Surf along east facing shores will build early next week due to a
combination of a moderate northeast swell associated with a batch
of gales off the west coast and increasing trade winds locally and
east of the state. There still remains some uncertainty of the
size of this swell and whether or not a high surf advisory will be
needed for east facing shores next week. Regardless, rough surf
seems likely for east facing shores next week.

For more details on the surf, please refer to the oahu
collaborative surf forecast (srdhfo).

Hfo watches warnings advisories
None.

Discussion... Jelsema
aviation... Bohlin
marine... Gibbs


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 40 mi41 min Calm G 1 77°F 81°F1015.3 hPa
ILOH1 - 1617760 - Hilo, HI 51 mi47 min WSW 5.1 G 7 73°F 78°F1016.1 hPa

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI13 mi36 minWNW 69.00 miOvercast75°F68°F79%1015.1 hPa

Wind History from HKO (wind in knots)
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Last 24hrSE7E7SE6E5E5E4E5CalmW5SW8SW10SW11W12SW11W10W9W8W8W6W7W7W6--W5
1 day agoE12NE6NE7N6NE6E6NE4CalmS9S10S11SW7S11S11S11S9S8SE5S3W5N7NE12NE5W4
2 days agoNE9NE4NW8NE10NE8E8NE4SW4W6W7W9SW9SW10SW12SW9SW10W8W7E9CalmN5NE4SE10E9

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
Click for Map
Sat -- 03:41 AM HST     0.83 feet High Tide
Sat -- 05:47 AM HST     Sunrise
Sat -- 06:33 AM HST     Moonrise
Sat -- 09:12 AM HST     -0.26 feet Low Tide
Sat -- 04:31 PM HST     2.60 feet High Tide
Sat -- 07:05 PM HST     Sunset
Sat -- 08:02 PM HST     Moonset
Sat -- 11:44 PM HST     0.03 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.20.40.60.80.80.70.40.1-0.1-0.3-0.20.10.61.21.82.32.62.62.31.91.30.80.30.1

Tide / Current Tables for Kailua Kona, Hawaii Island, Hawaii
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Kailua Kona
Click for Map
Sat -- 03:23 AM HST     1.16 feet High Tide
Sat -- 05:47 AM HST     Sunrise
Sat -- 06:33 AM HST     Moonrise
Sat -- 09:30 AM HST     -0.49 feet Low Tide
Sat -- 04:44 PM HST     2.50 feet High Tide
Sat -- 07:05 PM HST     Sunset
Sat -- 08:02 PM HST     Moonset
Sat -- 11:23 PM HST     0.22 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.711.11.10.90.60.1-0.2-0.5-0.5-0.20.30.91.62.12.42.52.31.91.30.80.40.2

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 (6,6,7,8)
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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.