Saturday, December16, 2017 L-36.com


Marine Weather and Tides
Leilani Estates, 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 6:47AMSunset 5:46PM Saturday December 16, 2017 8:47 AM HST (18:47 UTC) Moonrise 5:28AMMoonset 4:58PM Illumination 3% Phase: Waning Crescent; Moon at 28 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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PHZ122 Big Island Windward Waters- 734 Am Hst Sat Dec 16 2017
.small craft advisory in effect through late this morning...
Rest of today..South winds 15 knots. Wind waves 5 feet. Northwest swell 6 feet. Haze through the day. Scattered showers in the morning. Slight chance of Thunderstorms and isolated heavy showers in the afternoon.
Tonight..Southeast winds 10 knots. Wind waves 5 feet. Northwest swell 5 feet. Haze. Scattered showers.
Sunday..South winds 10 knots. Wind waves 5 feet. Northwest swell 5 feet. Haze. Scattered showers.
Sunday night..Winds variable less than 10 knots. Wind waves 5 feet. Northwest swell 5 feet. Scattered showers.
Monday..Winds variable less than 10 knots. Wind waves 4 feet. Northwest swell 5 feet. Scattered showers.
Monday night..Winds variable less than 10 knots. Wind waves 4 feet. Northwest swell 5 feet. Scattered showers in the evening, then isolated showers after midnight.
Tuesday..North winds 10 knots in the morning becoming variable less than 10 knots. Wind waves 3 to 4 feet. North swell 6 to 8 feet. Scattered showers.
Wednesday..North winds 10 knots. Wind waves 4 feet. North swell 7 to 8 feet. Scattered showers.
PHZ100 734 Am Hst Sat Dec 16 2017
Synopsis for hawaiian coastal waters.. Winds and seas will continue to subside today, as a low pressure trough moves westward over the state. This trough will produce light winds over the area through early next week, then northeast winds will increase across western sections on Tuesday as a cold front moves in.

7 Day Forecast for Marine Location Near Leilani Estates, HI
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location: 19.4, -154.93     debug


Area Discussion for -
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Fxhw60 phfo 161412
afdhfo
area forecast discussion
national weather service honolulu hi
412 am hst Sat dec 16 2017

Synopsis
Upper-level low pressure combined with pockets of enhanced
moisture will continue to produce periods of rainfall with
the possibility of locally heavy downpours and a slight chance
of thunderstorms into tonight. A brief respite from the active
weather pattern is expected from late Sunday into Monday.

However, increasing rainfall is possible again late Monday and
Tuesday as an upper-level trough moves over the islands from the
northwest.

Discussion
A nearly north to south oriented surface trough, which appears to
be in the vicinity of maui county, is slowly tracking westward.

The presence of this feature has caused the gradient to weaken
across the islands early this morning. Aloft, middle and upper-
tropospheric lows are located around 265 miles north of hilo. The
surface trough described above is a reflection of these nearly
stationary system. The close proximity of these lows to the
islands has destabilized the atmosphere over the state. The early
morning hilo balloon sounding indicated no significant low-level
inversion. Satellite imagery and radar reflectivity data show
scattered to broken low- and mid-level clouds with embedded
numerous showers streaming down from the north in the vicinity of
kauai and oahu, and just southwest of maui county. There are
fewer clouds and showers near the big island.

The lows aloft are expected to remain just northeast of the
islands today, and then slowly pull away toward the north later
tonight and Sunday. The surface trough will eventually move
westward over the western end of the island chain today and
tonight. Pockets of locally enhanced moisture will also continue
to move over the islands, which will produce wet weather across
most of the state into tonight. In addition, the unstable
atmosphere may cause locally heavy downpours and a slight chance
of thunderstorms. The light and variable surface winds will also
allow local sea breezes to develop this afternoon, and possibly
Sunday. The sea breezes may provide additional support for deep
convection over some of the islands later today.

The cold air aloft associated with the upper lows may bring near
freezing temperatures on haleakala summit. The moisture is already
deep enough to reach the summit, so a winter weather advisory
remains in effect for mount haleakala above 9 thousand feet due
to the potential of freezing rain. See the winter weather message
(wswhfo) product on our website for more information.

The upper lows will eventually lift away to the north Sunday,
which may provide a brief respite from the active weather from
late Sunday into Monday. However, an upper-level trough is
forecast to dig down toward the islands from the northwest, as
deep tropical moisture pushes up from the southeast from late
Monday through Tuesday. This may result in widespread showers
across most of the islands. In addition, a cold front (or two) may
sweep down across the islands from the northwest late next week.

Aviation
A cut off low north of the state will continue to produce
enhanced showers and clouds over the islands today. Heavier
shower activity will favor mountain areas and north through east
slopes of maui, molokai, oahu and kauai. Drier air continues to
linger over the big island limiting clouds and showers for both
islands this morning. Slight chances for thunderstorms remain in
the forecast.

Airmet sierra remains in effect for tempo mountain obscuration
over the entire island of lanai along with north through east
sections of maui, molokai, oahu and kauai. This airmet will likely
continue through the morning hours.

Marine
A surface trough located near maui county will continue to drift
westward across the coastal waters through the weekend. This
trough has already lowered the winds over the eastern waters. The
weakening trend should proceed into the western waters today.

Winds should remain light to gentle across the entire area from
tonight through early next week.

Nearshore pacioos buoys show seas lingering around 10 feet across
the windward waters, and we have extended the small craft
advisory through noon today. Seas should drop below advisory
criteria by this afternoon.

Lingering short-period northeasterly swell may continue to produce
minimal advisory-level surf along east facing shores this morning,
and we have also extended the high surf advisory for those shores
through noon today. Surf should drop below advisory levels by this
afternoon.

A small northwest swell will produce surf well below advisory
levels tonight through Monday, then a larger north-northwest
swell may produce surf approaching advisory levels late Tuesday
into Wednesday. An even larger north swell may affect the area
late next week.

Heavy showers and isolated thunderstorms will be possible across
parts of the coastal and offshore waters today and tonight
due to a nearby upper level trough.

See the collaborative nearshore swell and wind forecast for
details on expected swell and resulting surf.

Hfo watches warnings advisories
High surf advisory until noon hst today for east facing shores
of kauai, oahu, molokai, maui, and the big island.

Winter weather advisory until noon hst today for haleakala
summit.

Small craft advisory until noon hst today for kauai northwest
waters-kauai windward waters-kauai leeward waters-kauai channel-
oahu windward waters-kaiwi channel-maui county windward waters-
big island windward waters.

Discussion... Houston
aviation... Bohlin
marine... Jacobson


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 24 mi47 min SSW 2.9 G 5.1 63°F 76°F1011.2 hPa (+1.2)
51206 26 mi50 min 74°F9 ft

Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
(wind in knots)    EDIT      (on/off)   Help
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NW14
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G35
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N17
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G16
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G22

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hilo, Hilo International Airport, HI23 mi54 minSW 410.00 miFair62°F52°F70%1011.3 hPa

Wind History from HTO (wind in knots)
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Last 24hrSW4N8N6N13N11N11N11N10N9N8W5W5W6SW5SW5SW6SW4SW8SW6SW5S5S3S4SW4
1 day agoN12
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2 days agoN10N13
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G22
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G20
NW11W4N7NW10

Tide / Current Tables for Hilo, Hilo Bay, Kunio Bay, Hawaii Island, Hawaii
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Hilo
Click for Map
Sat -- 02:30 AM HST     2.70 feet High Tide
Sat -- 05:28 AM HST     Moonrise
Sat -- 06:47 AM HST     Sunrise
Sat -- 08:55 AM HST     0.76 feet Low Tide
Sat -- 01:40 PM HST     1.57 feet High Tide
Sat -- 04:57 PM HST     Moonset
Sat -- 05:44 PM HST     Sunset
Sat -- 07:52 PM HST     -0.21 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.92.42.72.72.421.51.10.80.80.91.11.31.51.61.41.10.60.2-0.1-0.2-00.41

Tide / Current Tables for Honuapo, Hawaii Island, Hawaii
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Honuapo
Click for Map
Sat -- 03:08 AM HST     2.73 feet High Tide
Sat -- 05:29 AM HST     Moonrise
Sat -- 06:48 AM HST     Sunrise
Sat -- 09:28 AM HST     0.76 feet Low Tide
Sat -- 02:18 PM HST     1.58 feet High Tide
Sat -- 05:00 PM HST     Moonset
Sat -- 05:47 PM HST     Sunset
Sat -- 08:25 PM HST     -0.21 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.62.12.62.72.62.31.81.410.80.80.91.21.41.61.51.30.90.40-0.2-0.20.10.6

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 (13,3,4,5)
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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.