Monday, August21, 2017 L-36.com


Marine Weather and Tides
Wainaku, 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 6:44PM Monday August 21, 2017 5:20 PM HST (03:20 UTC) Moonrise 6:01AMMoonset 7:01PM Illumination 0% Phase: New Moon; Moon at 29 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- 325 Pm Hst Mon Aug 21 2017
Tonight..East winds 15 knots. Wind waves 5 feet. SWell east 3 feet. Heavy showers likely.
Tuesday..East winds 15 knots. Wind waves 5 feet. SWell east 3 feet. Heavy showers likely in the morning, then scattered heavy showers in the afternoon.
Tuesday night..East winds 15 knots. Wind waves 5 feet. SWell east 3 feet. Scattered showers.
Wednesday..East winds 15 knots. Wind waves 6 feet. Southeast swell 3 feet and east 4 feet. Scattered showers.
Wednesday night..East winds 15 knots. Wind waves 7 feet. Southeast swell 3 feet and east 5 feet. Isolated showers after midnight.
Thursday..East winds 20 knots. Wind waves 6 feet. Southeast swell 3 feet and east 4 feet. Isolated showers in the morning.
Thursday night..East winds 15 knots. Wind waves 6 feet. SWell east 4 feet. Isolated showers after midnight.
Friday..East winds 15 knots. Wind waves 5 feet. SWell east 3 to 4 feet. Isolated showers.
Saturday..East winds 15 knots. Wind waves 4 to 5 feet. SWell east 3 feet. Scattered showers.
PHZ100 325 Pm Hst Mon Aug 21 2017
Synopsis for hawaiian coastal waters.. A weak cold front far to the north has weakened the subtropical ridge of high pressure. As the front moves east, high pressure will rebuild north of the area on Tuesday and strengthen the trade winds. An upper level low will produce unstable conditions over the western waters through Tuesday.

7 Day Forecast for Marine Location Near Wainaku, HI
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location: 19.73, -155.06     debug


Area Discussion for -
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Fxhw60 phfo 220158
afdhfo
area forecast discussion
national weather service honolulu hi
358 pm hst Mon aug 21 2017

Synopsis
Trade winds will prevail through the week as a ridge remains to
our north. Tropical moisture and atmospheric instability will
maintain muggy conditions, passing heavy showers, and a slight
chance of thunderstorms through Tuesday. Drier and windier
conditions will return Wednesday as the ridge strengthens to our
north.

Discussion
Afternoon satellite, lightning, and radar data show pockets of
enhanced convection across the state with flooding occurring on
kauai, maui, and the big island this afternoon. Moderate trade
wind showers are affecting the rest of the islands with pockets
of locally heavy showers. The thunderstorms are forming under the
influence of an upper low that is moving slowly southward,
bringing cooler temperature aloft and instability to the
atmosphere. Thunderstorm activity should decrease this evening
over the eastern half of the state as the islands cool, but
thunderstorms may remain over and near kauai into the night as an
upper low remains near the garden isle. Overnight, showers will
focus mainly over windward slopes and mountain areas with passing
showers over leeward locations. The elevated low level moisture
has brought uncomfortable conditions with dew points in the low to
mid 70's. Muggy conditions will continue through Tuesday.

Leeward showers will increase again Tuesday afternoon with land
heating lending some extra oomph at the surface to combine with
the instability of the upper low. The chance of heavier showers
and downpours will continue into Tuesday evening. The possibility
of thunderstorms will continue near kauai through Tuesday, and
over the big island Tuesday afternoon. By Wednesday, the upper low
is expected to move farther west of kauai with midlevel ridging
building over the state from the east. High pressure to the north
will build trade winds to breezy levels for the second half of the
week with stable conditions prevailing.

Aviation
A ridge of high pressure north of the state will keep moderate
trade winds in place through tonight. Clouds and showers will
favor windward and mauka areas, but daytime heating will result in
showers across leeward areas as well. An unstable airmass over
the islands may also result in thunderstorms across portions of
the island chain this afternoon into early this evening. MVFR and
lower conditions will become more common as shower coverage and
intensity increases across the state this afternoon into this
evening. Otherwise, MVFR CIGS vsbys should remain primarily
confined to windward and mauka locales.

Airmet sierra remains in effect for mountain obscuration on the
island of oahu. Conditions should improve here later this
morning. This afternoon, mountain obscuration will likely become
an issue once again across portions of the state, and will issue
airmets as conditions develop.

Marine
A cold front far to the north of the hawaiian islands has weakened
the subtropical ridge of high pressure resulting in moderate trade
winds across the region. As the front moves eastward, high
pressure north of the state will strengthen and increase the trade
winds. The trades are expected to reach small craft advisory
criteria on Tuesday for the normally windier channels between the
islands and the coastal waters south of the big island.

The above-mentioned upper level low will continue to produce
isolated thunderstorms over coastal and offshore waters through
Tuesday. The highest risk is for the waters in the west half of
the forecast area. More stable and drier conditions are expected
on Wednesday and through the second half of the week.

For surf, east-facing shores should see a slight increase in surf
heights as the trade winds rebuild on Tuesday. A longer period
east swell may also arrive during the second half of the week as a
result of tropical cyclone activity in the eastern pacific.

South-facing shores may see a slight increase in surf this weekend
from a swell train that originated from a tasman sea gale. A
small background southeast swell is also expected through the
forecast period.

Hfo watches warnings advisories
None.

Morrison... Discussion
kodama... Marine
jelsema... Aviation


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 0 mi51 min NNE 2.9 G 4.1 79°F 80°F1014.2 hPa
51206 6 mi54 min 83°F5 ft
KWHH1 46 mi51 min SW 2.9 G 4.1 83°F 83°F1013.1 hPa

Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hilo, Hilo International Airport, HI1 mi28 minN 06.00 miLight Rain Fog/Mist77°F75°F94%1014.2 hPa

Wind History from HTO (wind in knots)
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Last 24hrW3SW11SW8SW3SW5SW6SW4SW6SW6SW6SW6SW7SW5SW5S3NE3E7N6NE9E11E10NE7E8NE3
1 day agoNE6CalmCalmSW4SW4CalmSW6SW4SW4SW5SW6SW5SW5S3CalmW3Calm3CalmNE6SE4SE8CalmCalm
2 days agoNE7NE3NE3SW5CalmNW7CalmCalm3CalmNW5SW4SW5W5CalmE7E5W6NW74NW7NE7E6NE9

Tide / Current Tables for Hilo, Hilo Bay, Kunio Bay, Hawaii Island, Hawaii
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Hilo
Click for Map
Mon -- 02:33 AM HST     1.83 feet High Tide
Mon -- 06:00 AM HST     Moonrise
Mon -- 06:02 AM HST     Sunrise
Mon -- 08:31 AM HST     New Moon
Mon -- 08:34 AM HST     -0.32 feet Low Tide
Mon -- 03:22 PM HST     2.94 feet High Tide
Mon -- 06:43 PM HST     Sunset
Mon -- 07:01 PM HST     Moonset
Mon -- 09:47 PM HST     0.25 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.11.51.81.81.61.10.60-0.3-0.300.61.322.62.92.92.51.91.30.70.30.30.4

Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Kawaihae
Click for Map
Mon -- 03:44 AM HST     1.29 feet High Tide
Mon -- 06:03 AM HST     Moonrise
Mon -- 06:04 AM HST     Sunrise
Mon -- 08:31 AM HST     New Moon
Mon -- 09:23 AM HST     -0.16 feet Low Tide
Mon -- 04:12 PM HST     2.50 feet High Tide
Mon -- 06:47 PM HST     Sunset
Mon -- 07:04 PM HST     Moonset
Mon -- 10:53 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
0.30.611.21.31.10.80.40.1-0.1-0.10.20.71.31.82.32.52.42.11.50.90.40.1-0

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 (23,6,7,8)
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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.