Monday, December11, 2017 L-36.com


Marine Weather and Tides
Puako, 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 6:44AMSunset 5:44PM Monday December 11, 2017 12:42 PM HST (22:42 UTC) Moonrise 1:18AMMoonset 1:42PM Illumination 40% Phase: Third Quarter Moon; Moon at 23 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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PHZ121 Alenuihaha Channel- 934 Am Hst Mon Dec 11 2017
Rest of today..South winds 10 knots. Wind waves around 2 feet or less. Northwest swell 8 feet. Isolated showers late this morning. Hazy.
Tonight..Southwest winds 10 knots. Wind waves around 2 feet or less, then around 3 feet after midnight. Northwest swell 6 feet. Hazy.
Tuesday..Southwest winds 15 knots. Wind waves around 3 feet. Northwest swell 6 feet, increasing to 8 feet in the afternoon. Isolated showers in the morning. Hazy.
Tuesday night..North winds 10 knots. Wind waves around 4 feet. Northwest swell 10 feet, increasing to 13 feet after midnight. Hazy. Scattered showers in the evening. Showers likely after midnight.
Wednesday..Northeast winds 20 knots. Wind waves around 5 feet. Northwest swell 15 feet. Scattered showers, mainly in the morning.
Wednesday night..Northeast winds to 25 knots. Wind waves around 8 feet. Northwest swell 14 feet. Isolated showers in the evening. Scattered showers after midnight.
Thursday..Northeast winds to 25 knots. Wind waves 8 to 9 feet. Northwest swell 10 to 12 feet. Scattered showers.
Friday..East winds 10 knots. Wind waves around 6 feet. Northwest swell 7 to 9 feet. Hazy. Scattered showers.
PHZ100 934 Am Hst Mon Dec 11 2017
Synopsis for hawaiian coastal waters.. The current north-northwest swell will continue to decline today. Another larger swell will arrive Tuesday, then peak Tuesday night into Wednesday. The next cold front is expected to move down the island chain Tuesday through Wednesday morning, with increasing north to northeast winds behind the front.

7 Day Forecast for Marine Location Near Puako, HI
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location: 20.04, -155.83     debug


Area Discussion for -
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Fxhw60 phfo 112026
afdhfo
area forecast discussion
national weather service honolulu hi
1026 am hst Mon dec 11 2017

Synopsis
A cold front will move down the island chain Tuesday morning
through Wednesday. Behind the front, breezy north winds bringing
cooler and drier conditions are expected through Thursday. A
moist airmass may move back across the state from the east over
the weekend.

Discussion
A broad trough positioned far to the north of the state is keeping
the forecast area under a weak surface ridge today. Upper air
soundings from lihue and hilo confirm that the state is under
drier than normal airmass with a stable layer limiting any clouds
and showers. The winds will remain light, however increasing
southwest flow will start to show up this afternoon for especially
the western half of the state as a new cold front approaches from
the northwest. Only minor updates to the temperature, pop, and
wind grid forecast for the daytime period to account for current
observation trends. Have pushed the arrival of areas of vog in
the smaller islands to later this afternoon or evening.

The short term outlook calls for the cold front to move down
across the islands chain. The front reaches kauai Tuesday morning,
oahu Tuesday afternoon, and maui Tuesday evening. The front
eventually pushes across the big island on Wednesday. Along the
front there will be clouds, with the threat of rain showers,
although the moisture and dynamics do not look sufficient for a
widespread rain threat associated directly with the front. As the
winds shift to the north and northeast behind the front, there may
be a brief period for upslope orographic showers on the windward
sides, but the airmass will dry quickly behind the front, so any
rainfall should be moderate to light.

For Wednesday and Thursday, a progressive surface high will pass
by to the north of the state giving us a period gusty
northeasterly trades. It stays quite dry and stable, so windward
and mountain showers will be quite limited.

For the extended period, the latest gfs ECMWF model guidance
continues to generally indicate that the upper level trough will
sharpen and develop into a cutoff low just E of the islands on
Friday, and then drift W over the islands through the weekend.

Depending on how the situation evolves, there is a chance of very
wet and unsettled weather this weekend. However, the latest model
runs suggest that the main moist and unstable air will remain east
and north of the state as the low moves west. Will continue to
monitor and trend the forecast as guidance evolves.

Aviation
Airmet tango for moderate turbulence aloft is currently in
effect. We expect to cancel the airmet by this afternoon. More
turbulence aloft is possible Tuesday as a trough aloft digs se
toward the main hawaiian islands.

An old frontal cloud band over the area has dissipated, a surface
ridge has built over the area, andVFR conditions now prevail
across the islands.

Low level flow over the area will rapidly veer out of the south
ahead of a front approaching from the northwest. As the front
approaches, remnants of the old front will become organized into
a ne-sw convergence band over the kauai channel. Clouds in this
band could produce enough MVFR ceilings over kauai or oahu to
require an airmet for mtn obsc by this evening.

The front is expected to reach kauai Tuesday morning and move
down to the big island by Wednesday afternoon. There will be
widespread MVFR and localized ifr ceilings and visibility along
the front.

Marine
The current north-northwest swell continues to decline. Buoy 51101
has shown a gradual trend over the last 24 hours, while some of
the nearshore buoys have shown a more stepped down trend. The hilo
bay buoy has been holding steady for the last couple of hours, but
we do anticipate it to trend downward through the day. A high surf
advisory continues today for north and west facing shores of the
smaller islands, and the north facing shores of the big island.

This swell continues to produce seas at or above 10 feet across
some windward waters near maui and the big island, and so the
small craft advisory (sca) continues for those areas through this
afternoon.

The next north-northwest swell is expected to arrive Tuesday,
then peak Tuesday night into Wednesday. This swell is forecast to
be even larger than the current swell, and will produce warning-
level surf on north and west facing shores of the smaller
islands. Surf on the north facing shores of the big island will
probably reach advisory levels in some areas, but with a lot of
local variations due to the expected 330 degree direction of this
swell. This swell will also bring seas back above 10 feet across
most of the marine area, beginning as early as midday Tuesday for
the far northwest waters, and spreading across the rest of the
area Tuesday night into Wednesday morning.

The next cold front is forecast to move down the island chain
Tuesday through Wednesday morning, with northerly winds
increasing behind the front. Winds behind this front will likely
reach SCA levels across much of the area by Wednesday afternoon or
Wednesday night.

See the latest oahu surf discussion (srdhfo) for additional details
on surf and swell.

Hfo watches warnings advisories
High surf advisory until 6 pm hst this evening for niihau-kauai
windward-kauai leeward-waianae coast-oahu north shore-oahu
koolau-molokai-maui windward west-maui central valley-windward
haleakala-big island north and east.

Small craft advisory until 6 pm hst this evening for maui county
windward waters-big island windward waters.

Discussion... Brenchley
aviation... Donaldson
marine... M ballard


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 0 mi43 min W 5.1 G 5.1 77°F 78°F1015 hPa (-1.3)
ILOH1 - 1617760 - Hilo, HI 46 mi43 min ENE 5.1 G 13 82°F 77°F1014 hPa (-2.8)
51206 49 mi46 min 77°F10 ft
KLIH1 - 1615680 - Kahului Bay, Maui, HI 68 mi43 min S 8.9 G 14 80°F 77°F1014.5 hPa (-1.1)

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Bradshaw Army Air Field / Hawaii, HI23 mi47 minW 810.00 miFair68°F42°F40%1014.9 hPa

Wind History from HSF (wind in knots)
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Last 24hrW5W9W5W7W4CalmCalmCalmCalmSE4CalmSE5SE4SE5SE3SE4SE5SE4SE4CalmCalmSW3SW4W8
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CalmW9W4CalmCalmSE4SE3SE3SE4SE4CalmSE5--CalmSE4SE5SE4CalmS3SW3W7W5
2 days agoW6
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Tide / Current Tables for Kawaihae, Hawaii Island, Hawaii
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Kawaihae
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Mon -- 01:17 AM HST     Moonrise
Mon -- 05:07 AM HST     0.76 feet Low Tide
Mon -- 06:48 AM HST     Sunrise
Mon -- 10:51 AM HST     1.55 feet High Tide
Mon -- 01:42 PM HST     Moonset
Mon -- 05:45 PM HST     Sunset
Mon -- 05:47 PM HST     0.02 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.41.31.110.80.80.80.91.11.41.51.61.51.20.90.60.30.100.10.40.71.11.4

Tide / Current Tables for Kailua Kona, Hawaii Island, Hawaii
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Kailua Kona
Click for Map
Mon -- 01:18 AM HST     Moonrise
Mon -- 04:40 AM HST     0.65 feet Low Tide
Mon -- 06:48 AM HST     Sunrise
Mon -- 10:47 AM HST     1.62 feet High Tide
Mon -- 01:42 PM HST     Moonset
Mon -- 05:46 PM HST     Sunset
Mon -- 05:47 PM HST     0.15 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.31.210.80.70.70.70.91.21.41.61.61.51.310.70.40.20.20.30.50.81.11.3

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 (17,4,5,8)
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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.