Monday, May29, 2017 L-36.com


Marine Weather and Tides
Kahaluu-Keauhou, 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 5:39AMSunset 6:55PM Sunday May 28, 2017 7:42 PM HST (05:42 UTC) Moonrise 8:53AMMoonset 10:18PM Illumination 14% Phase: Waxing Crescent; Moon at 4 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- 330 Pm Hst Sun May 28 2017
Tonight..Winds variable less than 10 knots west of the big island...east 10 knots near south point. Wind waves 2 feet or less. SWell south 3 to 4 feet. Haze. Isolated showers.
Monday..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 2 feet or less. SWell south 3 feet. Haze through the day. Isolated showers in the afternoon.
Monday night..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 2 feet or less. SWell south 3 feet. Haze through the night. Scattered showers in the evening. Isolated showers after midnight.
Tuesday..North winds 15 knots. Wind waves 2 feet or less then 6 feet in the afternoon. Haze through the day. Isolated showers through the day.
Tuesday night..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 7 feet. Haze. Isolated showers.
Wednesday..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 7 feet. Haze. Isolated showers.
Wednesday night..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 7 feet. Haze. Isolated showers.
Thursday..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 8 feet. Haze. Isolated showers.
Friday..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 6 feet. Haze. Isolated showers.
PHZ100 330 Pm Hst Sun May 28 2017
Synopsis for hawaiian coastal waters.. A high northwest of the area will weaken through memorial day. A new high will build northeast of the area starting Monday night.

7 Day Forecast for Marine Location Near Kahaluu-Keauhou, HI
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location: 19.61, -155.97     debug


Area Discussion for -
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Fxhw60 phfo 290200
afdhfo
area forecast discussion
national weather service honolulu hi
400 pm hst Sun may 28 2017

Synopsis
Light winds will prevail through the holiday weekend, allowing
for a few windward showers during nights and mornings, with clouds
and showers shifting to leeward and interior areas in the
afternoons. The island atmosphere will be a little unstable today,
which will allow some showers to become briefly heavy. Light to
moderate trade winds on Tuesday and Wednesday are expected to
become breezy by the end of the week. The trade winds will bring a
few brief windward showers, with mostly dry conditions leeward,
as a more seasonable weather pattern develops.

Discussion
Surface troughs NW and E of the state have interrupted island
trade winds, bringing variable winds with daytime sea breezes and
nighttime land breezes over the islands. This trend will continue
through memorial day. Without the cooling trades, sensible weather
will be hot and humid during the day with cooling temperatures at
night. Current afternoon conditions are partly to mostly cloudy
skies with sea breezes, and land heating creating rising motion
over interior areas. The big island has seen the heaviest showers
this afternoon with isolated thunderstorms forming upslope of hilo
and along the hamakua coast. Any lingering thunderstorm and heavy
shower activity should diminish this evening as the Sun sets and
the islands cool.

An upper level trough now over the eastern end of the state has
brought some instability to the atmosphere. The soundings from
hilo shows a jump in atmospheric instability with ml cape
increasing from 311 j kg early this morning to 1149 k kg this
afternoon. This instability weakened our normally cloud capping
temperature inversion, and allowed for the aforementioned
thunderstorms to form in conjunction with the peak land heating.

The upper trough and instability will move steadily northeast
tonight allowing a more stable atmosphere to move over the aloha
state tonight and tomorrow. For memorial day, expect clear skies
in the morning with clouds and isolated showers during the
afternoon. With the more stable atmosphere, any showers that do
occur will carry only light to moderate rainfall.

High pressure will build north of the state Monday night and
Tuesday bringing back our normal trade winds with windward and
mountain showers expected through the rest of the week.

Aviation
A weak high pressure ridge north of the hawaiian islands will
continue to produce weak easterly trade winds through Monday
allowing onshore sea breezes to develop over each island during
the day with offshore land breezes at night. Cloud ceilings and
scattered showers will develop over island interiors by afternoon
with brief periods of MVFR conditions forecast through the early
evening hours. Land breezes overnight will tend to clear out cloud
cover over each island by the early morning hours.

An upper level low currently over the big island will continue to
drift eastward away from the state over the next 24 hours.

Unstable air with this low will continue to produce thunderstorm
activity over the big island through 03z. Cloud tops will range
from 10-15kft across the islands with CB cloud tops up to 30kft.

Airmet sierra in effect for mountain obscuration on the eastern
slopes of the big island until 0400z.

Marine
Surf along the south facing shores has dropped below advisory
levels, so the high surf advisory has been cancelled. Although the
surf is on the decline, it will remain elevated and will
contribute to coastal flooding.

Actual tides at honolulu continue to arrive about 0.5 feet above
predicted level. High tides today and tomorrow are predicted to be
over 2 feet, and just under 2 feet on Tuesday at honolulu. The
combination of king tides and the south swell continues to bring
the likelihood of coastal inundation, particularly during the
afternoon evening high tide period. Despite the south swell surf
declining, and the height of the high tides diminishing, impacts
are still expected through memorial day, but are not expected to
be as large of an impact as the last couple of days. Please see
the special weather statement (spshfo) product for more
information about the potential impacts from the high tides
combined with the large surf.

A similar period of tides exceeding 2 feet are expected in mid to
late june, between june 21 and june 27. It is during this period
that tide levels are expected to reach the same heights as during
this current event.

A northeast swell building today will produce moderate surf
through memorial day along east facing shores. North swells will
be very small though memorial day. A moderate north northwest
swell is forecast to arrive Monday night, peak below advisory
levels Tuesday night, then subside through Thursday.

Light winds are expected to persist through memorial day, with
trade winds forecast to gradually strengthen starting Tuesday.

Winds could reach small craft advisory (sca) levels in the typical
windier locations around maui county and the big island
Wednesday.

Hfo watches warnings advisories
None.

Morrison... Discussion
bohlin... Aviation
m ballard... Marine


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 30 mi43 min SW 8 G 9.9 79°F 81°F1015.9 hPa (+1.3)
ILOH1 - 1617760 - Hilo, HI 49 mi43 min SE 4.1 G 6 78°F 79°F1015.9 hPa (+0.6)
KLIH1 - 1615680 - Kahului Bay, Maui, HI 93 mi43 min N 6 G 13 78°F 81°F1016.4 hPa (+1.0)

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI3 mi50 minSSW 710.00 miFair80°F66°F62%1015.6 hPa

Wind History from HKO (wind in knots)
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Last 24hrW4SW5SW5S5SE8SE5E4E5E4E3E4CalmW4W8NW9W11W9W8SW9SW10SW8SW9SW9SW7
1 day agoW4SW33SE9SE9SE9SE8SE8SE6E4SE4E4SW4SW6W7W9SW10W9W9W8W9W8W8W5
2 days agoS6SE4CalmNE12NE11NE6NE7NE8NE4NE3NE6NE4CalmSW6SW7W8W9W9W9SW9W10W7W4N5

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
Click for Map
Mon -- 01:51 AM HST     0.03 feet Low Tide
Mon -- 05:44 AM HST     Sunrise
Mon -- 06:50 AM HST     0.69 feet High Tide
Mon -- 09:54 AM HST     Moonrise
Mon -- 11:50 AM HST     0.10 feet Low Tide
Mon -- 06:58 PM HST     Sunset
Mon -- 07:14 PM HST     2.17 feet High Tide
Mon -- 11:11 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.30.100.10.30.50.60.70.60.50.30.10.10.20.40.81.31.722.22.11.91.51.1

Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Kawaihae
Click for Map
Mon -- 02:04 AM HST     0.05 feet Low Tide
Mon -- 05:43 AM HST     Sunrise
Mon -- 07:14 AM HST     0.84 feet High Tide
Mon -- 09:53 AM HST     Moonrise
Mon -- 12:14 PM HST     0.14 feet Low Tide
Mon -- 06:58 PM HST     Sunset
Mon -- 07:35 PM HST     2.40 feet High Tide
Mon -- 11:11 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.20.10.10.30.50.70.80.80.70.40.20.10.20.40.81.31.72.12.42.42.21.81.3

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 (1,6,7,8)
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Ground Weather Radar Station Kohala, 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.