Monday, January22, 2018 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 6:56AMSunset 6:08PM Monday January 22, 2018 9:45 AM HST (19:45 UTC) Moonrise 10:51AMMoonset 11:14PM Illumination 35% Phase: Waxing Crescent; Moon at 6 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- 324 Am Hst Mon Jan 22 2018
.small craft advisory in effect through Tuesday afternoon...
Today..East winds to 25 knots. Wind waves 7 feet. Mixed swell northwest 6 feet and east 6 feet. Isolated showers through the day.
Tonight..East winds to 25 knots. Wind waves 7 feet. Mixed swell northwest 7 feet and east 5 feet. Isolated showers through the night.
Tuesday..East winds to 25 knots. Wind waves 7 feet. Mixed swell northwest 6 feet and east 5 feet. Isolated showers.
Tuesday night..East winds to 25 knots. Wind waves 7 feet. Mixed swell northwest 5 feet and east 5 feet. Isolated showers through the night. Haze after midnight.
Wednesday..East winds to 25 knots. Wind waves 7 feet. Mixed swell northwest 4 feet and east 5 feet. Haze through the day. Isolated showers through the day.
Wednesday night..East winds 20 knots. Wind waves 5 feet. Mixed swell northwest 3 feet and east 5 feet. Haze through the night. Isolated showers in the evening. Scattered showers after midnight.
Thursday..East winds 20 knots. Wind waves 4 to 5 feet. Mixed swell northwest 3 feet and east 5 to 6 feet. Haze. Isolated showers.
Friday..Northeast winds 20 knots easing to 10 knots. Wind waves 3 to 4 feet. Mixed swell northwest 3 to 4 feet and east 6 feet. Haze. Isolated showers.
PHZ100 324 Am Hst Mon Jan 22 2018
Synopsis for hawaiian coastal waters.. Ridge of high pressure will strengthen north of the islands through the first half of the week as weak low pressure to the north lifts northeastward and away from the region. The ridge will weaken through the second half of the week as low pressure passes far to the north and drags a front into the area.

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 221738
afdhfo
area forecast discussion
national weather service honolulu hi
738 am hst Mon jan 22 2018

Update
The winter weather advisory has been updated to reflect the threat
of snow and freezing rain at the summits. The moisture layer is
not quite as deep, so the main threat will be freezing rain, but
any convection that forms could bring a short burst of snow.

For aviation purposes, tempo light icing has been added to airmet
zulu for the big island.

Synopsis
A long band of unstable cumulus clouds and showers continues to
drift across the big island this morning. Expect increasing shower
coverage across the windward slopes of the big island this morning
with clouds and showers expanding to the island of maui later
this afternoon and evening. Elsewhere moderate trade winds will
focus clouds and showers over windward and mountain areas of each
island. A weak upper level disturbance will help to enhance shower
activity through Wednesday. Lighter winds with land and sea
breezes are forecast from Thursday through Saturday as the ridge
north of the islands weakens.

Prev discussion issued 406 am jan 22
the satellite imagery this morning shows an enhanced area with
deeper clouds approaching the windward slopes of the big island
expect increasing showers from south point to hilo to upolu point
with isolated thunderstorms in the forecast. Clouds and showers
will reach the summits of maunakea and maunaloa later this morning
with snow showers in the forecast for the peaks. A winter weather
advisory was issued this morning for summit elevations above
12000 feet with 3 to 5 inches of total snowfall expected through 6
pm hst.

Model guidance continues to show the band of clouds and showers
near the big island expanding northward later today into maui
with higher precipitable water (pw) values in the 1 inch to 1.6
inch range advecting northward into the northern islands of oahu
and kauai by Tuesday morning. An upper level disturbance will
also pass over the islands helping to lift the boundary layer and
increase both windward and leeward shower coverage.

Tuesday and Wednesday, moderate trade winds will continue with
clouds and showers focused mainly along windward slopes of each
island. The combination of higher pw amounts and low level
instability moving northward from the big island and an upper
level disturbance will help allow some of these windward showers
to drift over leeward sections of each island.

A stronger frontal system will move into the central pacific by
the middle of the week. This system will help break down the
ridge north of the islands allowing on-shore sea breezes and off-
shore land breezes to develop each day Thursday through Saturday.

Land surface heating during the daytime hours will produce clouds
and a few showers over interior sections with overnight land
breeze clearing.

Aviation
Moderate trade winds will continue through tonight as a ridge of
high pressure persists to the north of the islands. Clouds and
showers will favor windward areas through the period, with showers
also reaching leeward areas from time to time. The majority of
the shower activity will remain over the big island this morning,
with showers then spreading northwestward into windward sections
of the smaller islands this afternoon and tonight. Prevailing MVFR
conditions are expected across windward sections of the big
island through the period, with MVFR conditions spreading
northwestward into windward sections of the smaller islands this
afternoon and tonight.

Airmet sierra is in effect for mountain obscuration across
windward sections of the big island. These conditions are
expected to persist through the day and possibly through the
overnight hours as well. The mountain obscuration airmet may be
needed this afternoon for leeward sections of the big island as
well. Additionally, the airmet may need to be expanded to include
windward sections of the smaller islands this afternoon and
tonight.

Airmet tango remains in effect for moderate low level turbulence
over and downwind of the terrain of all islands. The airmet is
expected to remain in place through through tonight.

Marine
Guidance remains in good agreement and depicts fresh to strong trade
winds holding through the first half of the week as the ridge of
high pressure strengthens in the wake of a weak front passing to
the north. The overnight ascat pass reflected this and showed up
to 25 kt in the alenuihaha channel and south of the big island. A
combination of winds and seas will support small craft advisory
conditions over most waters through as late as Wednesday.

Ecmwf and GFS both support a downward trend for the local winds
through the second half of the week as a gale-force low passes
north of midway Monday night into Tuesday, then tracks slowly
northeastward to an area well north of hawaii Wednesday through
Friday. Light and variable (land sea breeze conditions) winds
can't be ruled out for the northwest islands as early as Thursday,
then for the entire state by Friday, which could linger into the
weekend.

The high surf advisory in place for east facing shores has been
extended through Tuesday due to a persistent large area of strong
trades south of high pressure between hawaii and the west coast.

This background easterly swell combined with strengthening trades
locally will support rough surf continuing through this time.

Guidance indicates this easterly source holding through the week,
despite the trades trending down locally Thursday into the
weekend.

For northern shores, surf will steadily rise through the day
today as a new, long-period, west-northwest (300-310 deg) swell
continues to fill in from a hurricane-force low late last week
across the far northwest pacific. This swell has been slowly
building (slower than predicted) at the offshore buoy northwest
of kauai through the night, which will be the trend at the exposed
beaches through the day as this source builds down the island
chain. Surf should reach advisory levels for exposed north and
west facing shores of the smaller islands by this afternoon (could
be late afternoon for oahu and maui county), then hold into
Tuesday before trending down into midweek.

For southern shores, surf will come up today as a new, long-
period, south (170-180 deg) swell fills in from recent activity
across the southern pacific. The nearshore pacioos pearl harbor
buoy has been slowly notching up overnight within the lower
frequency bands (14-16 sec). Will likely see this source peak
through the night tonight, then trend down into midweek.

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

Winter weather advisory until 6 pm hst this evening for big
island summits.

Small craft advisory until 6 pm hst Tuesday for kauai northwest
waters-kauai windward waters-kauai leeward waters-kauai channel-
oahu windward waters-kaiwi channel-maui county windward waters-
pailolo channel-alenuihaha channel-big island windward waters-
big island leeward waters-big island southeast waters.

Discussion... M ballard
aviation...

marine...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 0 mi45 min W 5.1 G 8 76°F 77°F1015.1 hPa (+1.7)
ILOH1 - 1617760 - Hilo, HI 46 mi45 min WSW 8 G 9.9 70°F 74°F1017.4 hPa (+1.7)
51206 49 mi48 min 75°F10 ft
KLIH1 - 1615680 - Kahului Bay, Maui, HI 68 mi45 min ENE 12 G 16 72°F 75°F1017.7 hPa (+2.0)

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Bradshaw Army Air Field / Hawaii, HI23 mi1.8 hrsS 1010.00 miFair52°F47°F84%1015.3 hPa

Wind History from HSF (wind in knots)
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2 days agoS18
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Tide / Current Tables for Kawaihae, Hawaii Island, Hawaii
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Kawaihae
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Mon -- 12:47 AM HST     0.47 feet Low Tide
Mon -- 07:00 AM HST     Sunrise
Mon -- 07:20 AM HST     1.90 feet High Tide
Mon -- 10:51 AM HST     Moonrise
Mon -- 02:20 PM HST     0.11 feet Low Tide
Mon -- 06:09 PM HST     Sunset
Mon -- 08:39 PM HST     1.29 feet High Tide
Mon -- 11:14 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.50.60.81.11.51.71.91.91.71.30.90.60.30.10.10.30.60.91.11.31.31.21

Tide / Current Tables for Kailua Kona, Hawaii Island, Hawaii
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Kailua Kona
Click for Map
Mon -- 12:15 AM HST     0.27 feet Low Tide
Mon -- 07:00 AM HST     Sunrise
Mon -- 07:03 AM HST     1.81 feet High Tide
Mon -- 10:51 AM HST     Moonrise
Mon -- 01:56 PM HST     0.25 feet Low Tide
Mon -- 06:10 PM HST     Sunset
Mon -- 07:50 PM HST     1.14 feet High Tide
Mon -- 11:14 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.30.30.50.81.11.51.71.81.71.51.20.80.50.30.30.30.50.711.11.11.10.90.7

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 (14,3,4,5)
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Ground Weather Radar Station Kohala, HI
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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.