Friday, December15, 2017 L-36.com


Marine Weather and Tides
Nanawale 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 6:46AMSunset 5:45PM Friday December 15, 2017 1:45 PM HST (23:45 UTC) Moonrise 4:37AMMoonset 4:14PM Illumination 6% Phase: Waning Crescent; Moon at 27 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- 924 Am Hst Fri Dec 15 2017
.small craft advisory in effect through late this afternoon...
Today..North winds 20 knots. Wind waves 7 feet. Northwest swell 8 feet. Showers likely in the morning. Slight chance of Thunderstorms through the day. Scattered heavy showers in the afternoon.
Tonight..North winds 10 knots. Wind waves 4 feet. Northwest swell 7 feet. Haze. Scattered heavy showers and slight chance of Thunderstorms.
Saturday..Winds variable less than 10 knots becoming southeast 10 knots in the afternoon. Wind waves 3 feet. Northwest swell 6 feet. Haze in the morning. Slight chance of Thunderstorms in the morning. Scattered heavy showers through the day. Chance of Thunderstorms in the afternoon.
Saturday night..Southeast winds 10 knots in the evening becoming variable less than 10 knots. Wind waves 5 feet. Northwest swell 5 feet. Haze. Scattered heavy showers.
Sunday..South winds 10 knots. Wind waves 5 feet. Northwest swell 5 feet. Haze. Scattered heavy showers.
Sunday night..West winds 10 knots in the evening becoming variable less than 10 knots. Wind waves 4 feet. Northwest swell 5 feet. Scattered showers.
Monday..Winds variable less than 10 knots. Wind waves 4 feet. Northwest swell 5 feet. Scattered showers.
Tuesday..Winds variable less than 10 knots becoming northeast 10 knots in the afternoon and evening, then veering southeast after midnight. Wind waves 3 to 4 feet. North swell 5 to 7 feet. Scattered showers.
PHZ100 924 Am Hst Fri Dec 15 2017
Synopsis for hawaiian coastal waters.. Northwest swell will continue to subside through Saturday. Strong northeast winds today will also subside tonight and into the weekend as a low pressure trough moves westward over the state.

7 Day Forecast for Marine Location Near Nanawale Estates, HI
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location: 19.49, -154.81     debug


Area Discussion for -
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Fxhw60 phfo 152202 aaa
afdhfo
area forecast discussion... Updated
national weather service honolulu hi
1202 pm hst Fri dec 15 2017

Update
Cancelled the wind advisory for big island summits and issued a
winter weather advisory for haleakala summit above 9000 feet for
freezing rain due to expected freezing temperatures and widespread
showers later today into Saturday morning. Freezing rain could
occasionally change over to snow at the summit level in heavier
showers or thunderstorms.

Synopsis
Breezy north to northeast winds will continue today, but the
winds will weaken from tonight into the weekend. An upper level
low and increasing moisture will bring unsettled weather to
portions of the state through this weekend. As a result, rain
chances will increase, with locally heavy downpours possible and a
slight chance of thunderstorms. Widespread rainfall is possible
early next week as an upper-level trough pushes toward the
islands from the northwest.

Previous discussion
A 1035 mb surface high is near 42n138w, or about 1800 miles
northeast of honolulu. A surface ridge extends southwest from this
high through a point approximately 600 miles north of kauai.

Elsewhere, a north to south oriented surface trough, which is
moving slowly westward, is evident about 250 miles east of hilo.

The tight pressure gradient between these features is maintaining
fresh to strong north to northeast winds across the state. A wind
advisory remains in effect for the big island summits this
morning. Note that the breezy conditions combined with low dew
points (in the 50s) continue to make sensible temperatures feel
relatively cool.

Aloft, middle and upper-tropospheric lows are located around 240
miles northeast of hilo. The surface trough described above is a
reflection of these features, which are propagating slowly toward
the west-southwest. The close proximity of the lows appears to
have already destabilized the atmosphere over the eastern end of
the state. The early morning hilo balloon sounding shows no
significant low-level inversion. Satellite imagery and radar
reflectivity data this morning indicate mainly broken low clouds
with embedded scattered showers moving down from the north and
northeast toward the windward and north facing sides of most
islands east of oahu.

The upper level lows, as well as the surface trough, will
approach the islands today. As a result, the north to northeast
winds will gradually weaken tonight. The upper lows are expected
to reach a position just northeast of the islands on Saturday, and
then slowly pull away toward the northeast on Sunday. By Saturday,
with the surface trough in the vicinity of the islands, the background
flow will become light and variable across most areas. This will
allow the development of local afternoon sea breezes. By Sunday,
the surface trough is forecast to be located west of the state,
with light southerly winds gradually spreading from east to west
across the area.

The cooler temperatures aloft associated with the middle and
upper-level lows will be close enough to destabilize the atmosphere
today, especially over central and eastern portions of the island
chain. In addition, increasing moisture will move in to the
islands as the surface trough approaches the state. This will
likely usher in an extended period of unsettled weather across the
region, with increasing chances for rainfall, and the possibility
of locally heavy downpours and isolated thunderstorms through the
weekend. In addition, there is a chance of rain mixed with snow
on the big island summits. By Saturday afternoon, daytime heating
and local sea breezes may provide additional support for deep
convection over the islands.

The upper lows will lift away to the north late Sunday, and may
provide a brief respite from the active weather on Monday.

However, an upper- level trough is forecast to dig down toward the
islands from the northwest, with deep tropical moisture pushes up
from the southeast Monday night into Tuesday. This may provide
widespread showers overspreading the islands. In addition, a
couple of cold fronts may sweep across the islands from the
northwest later in the week, which may result in an extended
period of northwest winds.

Aviation
Locally strong north to northeast winds will continue today,
before becoming light and variable Saturday as a surface trough
east of the state moves west. Airmet tango for low level
turbulence is posted across the state. This will likely be able
to be cancelled this evening as winds ease.

An upper level low just northeast of the state will gradually
move west over the next day. This low will help to destabilize
the atmosphere around the state, and will help to enhanced passing
showers showers today. Showers could be locally heavy at times,
carrying MVFR to isol ifr conditions. The forecast also introduces
a slight chance of thunderstorms from oahu through big island
this afternoon. Airmet sierra for mountain obscuration cannot be
ruled out today, and will be issued as needed.

Marine
A surface trough northeast through east of the big island will be
moving westward across the coastal waters over the next several
days. The trough will weaken the winds over the eastern waters
initially today then over the western waters later tonight. Winds
should remain light through early next week.

Observations from the nearshore pacioos buoys have been showing a
declining northwest swell through the morning. This trend should
continue through the rest of today. The nearshore buoys are also
showing a short period northeast wave component produced by strong
northeasterly winds west of the trough. The northeasterly swell
is large enough to warrant a high surf advisory for east facing
shores. As the winds decrease, the northeasterly swell will
decrease and drop below advisory level, possibly by early Saturday
morning.

As the winds and seas gradually subside, conditions are expected
to drop below small craft advisory criteria, possibly by tonight
for all waters through Monday.

Heavy showers and isolated thunderstorms will be possible across
parts of the coastal and offshore waters today through at least
Saturday 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 6 am hst Saturday for east facing shores
of kauai, oahu, molokai, maui and big island.

Winter weather advisory from 4 pm this afternoon to noon hst
Saturday for haleakala summit.

Small craft advisory until 6 pm hst this evening for all hawaiian
waters, except the big island southeast waters.

Update previous discussion... Foster
aviation... Eaton
marine... Kodama


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 21 mi45 min N 17 G 20 73°F 76°F1010.7 hPa (-3.3)
51206 22 mi48 min 77°F10 ft

Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
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G35
NE20
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N17
N27
N22
G27
NE14
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NW7
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G20
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N25
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G28
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NE22
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NE9
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SE4
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W2
N17
G21
N16
N22
N18
G23
N22
N17
G21

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hilo, Hilo International Airport, HI21 mi52 minN 1110.00 miFair76°F55°F48%1011.2 hPa

Wind History from HTO (wind in knots)
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Last 24hrN15
G24
NE16
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N12
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N10NW8N11NW10N7NW7NW7NE14
G26
W9N12
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SW8SW4N8N6N13N11
1 day agoN12N11N14
G24
NE9NW6NW8N8N9NW6N8NW12NW9N12
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NW11W4N7NW10N12
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2 days agoNE5N7E5SE4SE4SW4SW4SW6W6SW7SW6SW7SW6SW7SW4SW8SW5SW4W5N15N13
G20
N11
G17
N12
G20
N13

Tide / Current Tables for Hilo, Hilo Bay, Kunio Bay, Hawaii Island, Hawaii
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Hilo
Click for Map
Fri -- 01:58 AM HST     2.57 feet High Tide
Fri -- 04:38 AM HST     Moonrise
Fri -- 06:47 AM HST     Sunrise
Fri -- 08:17 AM HST     0.83 feet Low Tide
Fri -- 01:04 PM HST     1.62 feet High Tide
Fri -- 04:15 PM HST     Moonset
Fri -- 05:44 PM HST     Sunset
Fri -- 07:22 PM HST     -0.16 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.12.52.62.42.11.71.310.80.91.11.31.51.61.51.30.90.40.1-0.1-0.10.20.71.3

Tide / Current Tables for Honuapo, Hawaii Island, Hawaii
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Honuapo
Click for Map
Fri -- 02:36 AM HST     2.59 feet High Tide
Fri -- 04:39 AM HST     Moonrise
Fri -- 06:47 AM HST     Sunrise
Fri -- 08:50 AM HST     0.83 feet Low Tide
Fri -- 01:42 PM HST     1.63 feet High Tide
Fri -- 04:18 PM HST     Moonset
Fri -- 05:47 PM HST     Sunset
Fri -- 07:55 PM HST     -0.16 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.82.32.52.62.421.51.10.90.80.91.21.41.61.61.51.10.70.3-0.1-0.2-00.40.9

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 (18,4,5,8)
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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.