Tuesday, August22, 2017 L-36.com


Marine Weather and Tides
Honaunau-Napoopoo, 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 6:01AMSunset 6:43PM Tuesday August 22, 2017 2:48 PM HST (00:48 UTC) Moonrise 7:02AMMoonset 7:49PM Illumination 1% Phase: New Moon; Moon at 1 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- 930 Am Hst Tue Aug 22 2017
.small craft advisory in effect through Thursday afternoon...
Rest of today..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 7 feet. Haze. Scattered heavy showers.
Tonight..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 7 feet. South swell 3 feet after midnight. Haze. Isolated showers.
Wednesday..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 9 feet. South swell 3 feet. Isolated showers in the morning. Haze through the day.
Wednesday night..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 9 feet. South swell 3 feet. Haze.
Thursday..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 9 feet. Southeast swell 3 feet. Haze.
Thursday night..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 8 feet. Southeast swell 3 feet. Haze.
Friday..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 7 to 8 feet. Southeast swell 3 feet. Haze.
Saturday..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 5 to 6 feet. Haze.
PHZ100 930 Am Hst Tue Aug 22 2017
Synopsis for hawaiian coastal waters.. Trade winds will be moderate to breezy across the area as high pressure strengthens north of the islands. An upper level low will produce unstable conditions over the western waters through today.

7 Day Forecast for Marine Location Near Honaunau-Napoopoo, HI
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location: 19.5, -155.74     debug


Area Discussion for -
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Fxhw60 phfo 221955
afdhfo
area forecast discussion
national weather service honolulu hi
955 am hst Tue aug 22 2017

Synopsis
An upper level low northwest of the islands will continue to bring
the chance for locally heavy showers, and the slight chance of
thunderstorms today. Otherwise, building trade winds will focus
clouds and showers over the windward areas. Breezy trade winds
and drier conditions will return Wednesday and continue into the
upcoming weekend as high pressure strengthens north of the state.

Trade winds are forecast to relax by the end of the upcoming
weekend as high pressure weakens to the north.

Discussion
An upper level low is about 275 miles northwest of kauai this
morning based on water vapor imagery. This upper level feature has
helped to destabilize the atmosphere over the region over the
last few days. The low is forecast to continue to move to the
west west northwest over the next couple of days. Its influence on
our local weather should diminish over the next 12 to 24 hours as
it moves away from the area.

During the pre-dawn hours, there was a thunderstorm just south of
niihau. Due to the proximity to the upper level low, thunderstorms
remain a possibility near kauai and niihau today. Build-ups on the
big island will also be possible, mainly during the afternoon
hours. Across the state, building trade winds will focus clouds
and showers over windward areas, but the instability provided by
the nearby upper level low could mean heavier showers at times
today.

A surface high building far north of the islands will maintain the
trade wind flow into the weekend. Moderate to locally breezy
trades are expected, so while most shower activity will be focused
over the windward and mauka areas, don't be surprised if a few
showers reach leeward areas. Winds will likely drop a touch over
the weekend as the high begins to weaken.

Aviation
Over the next 24 hours, a surface high will build far N of the
area, while a low aloft NW of kauai moves w. This will lead to
strengthening trade winds and a reduction in shower coverage and
intensity. In the meantime, the island atmosphere remains
sufficiently unstable to support the development of +shra +tsra
which have the potential to bring ifr cig vis.

Most likely location for MVFR ifr conditions in the short term is
over and near the big island and windward maui, where airmet
sierra remains in effect for mountain obscuration. The increasing
winds have also prompted the issuance of airmet tango for low-
level turbulence.

Marine
With trade winds on the increase, a small craft advisory (sca) is
currently in effect for the typically windier zones around maui
county and the big island. The SCA is in effect through Thursday
afternoon.

An upper level low has been heading west away from the islands,
but will still likely produce isolated thunderstorms over coastal
and offshore waters through the day. The highest risk is for the
waters in the west half of the forecast area. More stable and
drier conditions are expected Wednesday and through the second
half of the week.

East-facing shores should see a slight increase in surf heights
as the trade winds rebuild today. A longer period east swell may
also arrive during the second half of the week as a result of
tropical cyclone activity in the eastern pacific. South-facing
shores may see a slight increase in surf this weekend from a swell
train that originated from a tasman sea gale. A small background
southeast swell is also expected through the forecast period.

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

Discussion... M ballard
aviation... Birchard
marine... Kinel


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 37 mi49 min WSW 6 G 8 82°F 83°F1014.6 hPa (-0.6)
ILOH1 - 1617760 - Hilo, HI 40 mi49 min WNW 5.1 G 7 81°F 80°F1015.9 hPa (-0.8)
51206 45 mi52 min 81°F6 ft

Wind History for Kawaihae, HI
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI17 mi56 minWSW 1010.00 miMostly Cloudy86°F73°F65%1014.2 hPa
Bradshaw Army Air Field / Hawaii, HI22 mi53 minN 010.00 miMostly Cloudy71°F57°F63%1014.4 hPa

Wind History from HKO (wind in knots)
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Last 24hrW11W8SW6W6SW6S7S10SE8SE9SE9SE7SE5SE7E6NE3CalmNE333W6SW8SW9SW9SW10
1 day agoSW11S14S11S7SE7CalmW5W5S4SE6SE6E8E8E5E4SE4SE3SE5S6SW7W9W11W12W11
2 days agoW10SW10SW10SW11W9W8SW8W5SW6SW5SE5S5----CalmCalmE33SW7SW7W7SW10SW10SW11

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
Click for Map
Tue -- 04:04 AM HST     1.35 feet High Tide
Tue -- 06:06 AM HST     Sunrise
Tue -- 07:03 AM HST     Moonrise
Tue -- 09:45 AM HST     0.12 feet Low Tide
Tue -- 04:26 PM HST     2.27 feet High Tide
Tue -- 06:46 PM HST     Sunset
Tue -- 07:49 PM HST     Moonset
Tue -- 11:09 PM HST     0.18 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.711.21.41.310.70.40.20.10.30.61.11.622.22.221.61.10.60.30.2

Tide / Current Tables for Kailua Kona, Hawaii Island, Hawaii
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Kailua Kona
Click for Map
Tue -- 03:56 AM HST     1.55 feet High Tide
Tue -- 06:06 AM HST     Sunrise
Tue -- 07:03 AM HST     Moonrise
Tue -- 09:53 AM HST     -0.13 feet Low Tide
Tue -- 04:34 PM HST     2.26 feet High Tide
Tue -- 06:46 PM HST     Sunset
Tue -- 07:49 PM HST     Moonset
Tue -- 10:57 PM HST     0.14 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.81.21.51.51.41.10.70.3-0-0.100.40.91.51.92.22.221.610.60.20.1

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 (20,4,5,8)
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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.