Sunday, August20, 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 6:01AMSunset 6:45PM Sunday August 20, 2017 11:10 AM HST (21:10 UTC) Moonrise 4:59AMMoonset 6:12PM Illumination 2% 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- 939 Am Hst Sun Aug 20 2017
Rest of today..East winds 15 knots. Wind waves 4 feet. Scattered showers.
Tonight..East winds 20 knots. Wind waves 5 feet. Showers likely.
Monday..East winds 15 knots. Wind waves 4 feet. Showers likely.
Monday night..East winds 15 knots. Wind waves 4 feet. Showers likely.
Tuesday..East winds 15 knots. Wind waves 5 feet. Occasional showers in the morning, then showers likely in the afternoon.
Tuesday night..East winds 15 knots. Wind waves 5 feet. Occasional showers.
Wednesday..East winds 15 knots. Wind waves 7 feet. SWell east 3 feet. Scattered showers.
Thursday..East winds 15 knots. Wind waves 6 feet. SWell east 3 feet. Scattered showers.
PHZ100 939 Am Hst Sun Aug 20 2017
Synopsis for hawaiian coastal waters.. A surface high will remain far northeast of the area and weaken through Tuesday. A new surface high will build far north of the area on Monday. A low aloft will pass to the north and west of kauai this afternoon through Tuesday.

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 202018
afdhfo
area forecast discussion
national weather service honolulu hi
1018 am hst Sun aug 20 2017

Synopsis
Light to moderate trade winds will prevail through early next
week as a weak ridge remains to our north. Tropical moisture from
the east will increase humidity and showers today, and keep muggy
conditions with enhanced showers around through Tuesday. Instability
aloft will introduce a slight chance of thunderstorms through
Tuesday. Drier and windier conditions will return Wednesday as the
ridge strengthens to our north.

Discussion
Moderate trade winds this morning are pushing clouds and showers
into windward and mountain areas with a few showers reaching
select leeward locations. Mid morning radar imagery shows a patch
of showers heading into puna district of the big island, so expect
clouds and wet weather to increase over that area today. Otherwise,
windward areas will continue to see mostly cloudy skies with
passing showers through the afternoon. Showers are expected to
increase tonight as enhanced low level moisture moves in the from
the east. This moisture will also increase our dew points into the
low to mid 70's by tonight, with humid conditions remaining
through Tuesday.

Along with the low level moisture, an upper level trough will push
south over the state tonight and Monday bringing slight instability
over the islands. The main axis of the trough looks to remain
near kauai through Tuesday before pushing west of the state. A
slight chance of thunderstorms is possible mainly near kauai and
oahu tonight through Tuesday. There is also the possibility of
upslope thunderstorms over the big island due to the elevated
terrain, enhanced low level moisture, and slight instability.

Outside of the thunderstorm threat, the general weather pattern
today through Tuesday will consist of windward clouds and showers
merging with afternoon and evening leeward clouds and showers,
with a hybrid light trade winds with leeward sea breeze setup. By
Wednesday, the upper trough will be far west of the islands, and
the ridge to the north is expected to rebound and drive stronger
trade winds across local waters. More stable conditions will
prevail as ridging aloft builds over the state.

Aviation
A moist and unstable airmass will remain in place over the state
through tonight. Clouds and showers will focus primarily over
windward and mauka areas, but sea breezes will also result in
leeward shower development this afternoon into this evening. An
isolated thunderstorm may also affect interior and leeward
sections of the big island this afternoon into early this
evening. MVFR CIGS vsbys will be possible in windward areas
through the next 24 hours, with these conditions being most common
during the overnight and early morning hours. Phli, phto and phny
are the most likely places to see reduced CIGS vsbys. Elsewhere,
predominantlyVFR conditions are expected. Light to moderate
trades will prevail, thanks to a ridge of high pressure to the
north of the islands.

No airmets are currently in effect. An airmet for mountain
obscuration may be needed later today or tonight for portions of
the island chain as showers increase in coverage and intensity.

Marine
Winds and seas are expected to remain in the light to moderate
range through Tuesday, then strengthen to moderate to locally
strong Wednesday through the remainder of the week. Increasing
shower coverage will become a possibility through the first half
of the work week as an upper trough drifts southwestward to a
location just west of kauai tonight and Monday. This upper trough
will also support a slight chance of thunderstorms over the
offshore waters mainly north through west through south of kauai
this afternoon through Tuesday.

Surf along south facing shores will continue to lower today as a
south-southeast swell continues to fade. Looking ahead, mainly
small background long- period reinforcing pulses out of the south-
southwest (210-220 deg) and south- southeast (130-160 deg) will
keep the surf from going flat along south facing shores this week.

A slightly larger south- southwest (220 deg) swell will be
possible next weekend due to a gale over the tasman sea. For more
detailed surf information, see the latest collaborative nearshore
swell and wind forecast at


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 21 mi40 min NNE 5.1 G 5.1 80°F 81°F1015.1 hPa
51206 22 mi43 min 81°F4 ft

Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hilo, Hilo International Airport, HI21 mi17 minN 010.00 miLight Rain81°F75°F82%1015.2 hPa

Wind History from HTO (wind in knots)
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Last 24hrNW74NW7NE7E6NE9NE6CalmCalmSW4SW4CalmSW6SW4SW4SW5SW6SW5SW5S3CalmW3Calm3
1 day agoN6N10N9NE9NE7NE7NE7NE3NE3SW5CalmNW7CalmCalm3CalmNW5SW4SW5W5CalmE7E5W6
2 days agoNE8N8E9N10N9NE8NE6NE4NE4NW3NW3W63CalmW3SW3SW3SW4SW5SW5CalmN5N4N6

Tide / Current Tables for Hilo, Hilo Bay, Kunio Bay, Hawaii Island, Hawaii
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Hilo
Click for Map
Sun -- 01:47 AM HST     1.70 feet High Tide
Sun -- 04:59 AM HST     Moonrise
Sun -- 06:01 AM HST     Sunrise
Sun -- 07:50 AM HST     -0.35 feet Low Tide
Sun -- 02:46 PM HST     2.99 feet High Tide
Sun -- 06:13 PM HST     Moonset
Sun -- 06:44 PM HST     Sunset
Sun -- 09:13 PM HST     0.32 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.41.61.71.51.10.60.1-0.2-0.3-0.10.41.11.82.52.932.72.21.610.50.30.40.7

Tide / Current Tables for Honuapo, Hawaii Island, Hawaii
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Honuapo
Click for Map
Sun -- 02:25 AM HST     1.72 feet High Tide
Sun -- 05:02 AM HST     Moonrise
Sun -- 06:04 AM HST     Sunrise
Sun -- 08:23 AM HST     -0.35 feet Low Tide
Sun -- 03:24 PM HST     3.02 feet High Tide
Sun -- 06:14 PM HST     Moonset
Sun -- 06:45 PM HST     Sunset
Sun -- 09:46 PM HST     0.32 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.21.51.71.71.40.90.4-0.1-0.3-0.300.61.42.12.7332.621.40.80.40.30.5

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 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.