Saturday, September23, 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 6:08AMSunset 6:15PM Saturday September 23, 2017 2:49 AM HST (12:49 UTC) Moonrise 9:14AMMoonset 9:01PM Illumination 8% Phase: Waxing Crescent; Moon at 3 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- 901 Pm Hst Fri Sep 22 2017
Rest of tonight..East winds 15 knots. Wind waves 4 feet. Mixed swell northwest 3 feet and southeast 3 feet. Isolated showers.
Saturday..East winds 15 knots. Wind waves 4 feet. Northwest swell 3 feet. Isolated showers in the morning.
Saturday night..Northeast winds 10 knots. Wind waves 3 feet. Northwest swell 3 feet. Isolated showers.
Sunday..East winds 10 knots. Wind waves 3 feet. Northwest swell 3 feet in the morning. Isolated showers in the morning.
Sunday night..East winds 10 knots. Wind waves 3 feet. Northwest swell 3 feet after midnight. Scattered showers.
Monday..East winds 10 knots. Wind waves 3 feet. Isolated showers.
Monday night..East winds 10 knots. Wind waves 3 feet. Isolated showers in the evening, then scattered showers after midnight.
Tuesday..East winds 10 knots. Wind waves 3 to 4 feet. Scattered showers.
Wednesday..Northeast winds 10 knots. Wind waves 4 feet. Northwest swell 3 feet. Scattered showers.
PHZ100 901 Pm Hst Fri Sep 22 2017
Synopsis for hawaiian coastal waters.. A ridge of high pressure far north of the state will slowly weaken through tonight. The ridge will move closer to the island chain over the weekend as a cold front passes to the north.

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 230626
afdhfo
area forecast discussion
national weather service honolulu hi
826 pm hst Fri sep 22 2017

Synopsis
Trade winds will gradually trend down over the weekend as a ridge
of high pressure to the north weakens and a weak surface trough
slowly approaches from the east. Mainly windward clouds with
light passing showers will prevail into early next week, with a
possible boost in shower activity around the middle of next week
as the surface trough moves through the islands.

Discussion
Currently at the surface, a 1027 mb high is centered around 1725
miles north-northeast of honolulu, and is driving moderate trade
winds across the island chain this evening. Meanwhile, a weak
surface trough is located around 550 miles northeast of hilo.

Infrared satellite imagery shows clear to partly cloudy skies in
place across the state, with some thin cirrus also moving over the
big island. Radar imagery shows scattered light showers moving
into windward areas, with a few lingering showers also over
leeward sections of the big island. Elsewhere predominantly rain
free conditions prevail. Main short term concerns revolve around
the diminishing trades and rain chances over the next couple of
days.

Tonight through Tuesday,
high pressure will weaken and shift eastward as the weak surface
trough northeast of the state shifts slowly westward toward the
island chain. This will result in a gradual easing of the trade
winds over the weekend, with light to locally moderate trades
expected for the first half of next week. Showers will continue to
favor windward and mauka areas through the period, although some
leeward shower development will be possible each day due to the
weakened trades. Overall, fairly dry conditions are expected
through the period given precipitable waters values in the 1.0 to
1.3 inch range, well below climatological norms for this time of
year.

Tuesday night through next Thursday,
the surface trough will shift westward across the island chain
during the middle of next week, and this should bring an increase
in shower activity, as well as increasing the trade wind flow
back to moderate levels. Showers will continue to favor windward
and mauka areas through the period.

Aviation
Except for the chance of brief MVFR conditions in passing showers
over windward and mauka sections across the island chain, and
tempo lower ceilings over leeward sections of the big island
tonight;VFR will predominate through Saturday.

Airmet tango remains in effect for low level turbulence over and
downwind of the mountains on all islands. This airmet will likely
be cancelled by midnight as the trade winds trend down.

Marine
Winds have decreased below small craft advisory (sca) threshold
this evening, and the earlier SCA for waters around maui and the
big island has been cancelled.

Surf along south facing shores will remain small through early next
week, with mainly background southeast and southwest swell energy
expected. The next potential long-period pulse out of the
southwest from the tasman sea is expected by Sunday and could
lead to a slight increase in surf. For the extended forecast,
strong to gale-force southwest winds associated with a low in the
tasman sea may lead to another small southwest swell Tuesday
through midweek.

A small northwest swell will continue into the weekend before
easing. Another small reinforcement from that direction is
expected to fill in around Sunday night through the middle of next
week.

Hfo watches warnings advisories
None.

Discussion... Jelsema
aviation... Kinel
marine... Powell


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 21 mi50 min SW 2.9 G 5.1 71°F 81°F1014.7 hPa (-1.2)
51206 22 mi53 min 81°F5 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 mi57 minWSW 610.00 miFair68°F63°F84%1014.9 hPa

Wind History from HTO (wind in knots)
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Last 24hrSW4SW3SW6SW4SW5SW5N3CalmN6NE7NE7NE7NE6NE7NE6CalmCalmSW4SW4SW4SW4SW6SW5SW6
1 day agoSW4SW4NW3SE4SW5NW5CalmNW3NW6NE10NW6NE9NE8NE9NE9NE4N4CalmSW3SW6SW4SW5W6SW4
2 days agoSW5W7W8W6CalmW6S8W7W8W8W6NW5CalmW5CalmCalmSW3SW4W4SW3SW3SW4SW4W4

Tide / Current Tables for Hilo, Hilo Bay, Kunio Bay, Hawaii Island, Hawaii
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Hilo
Click for Map
Sat -- 05:01 AM HST     2.35 feet High Tide
Sat -- 06:09 AM HST     Sunrise
Sat -- 09:15 AM HST     Moonrise
Sat -- 11:06 AM HST     0.67 feet Low Tide
Sat -- 04:42 PM HST     1.93 feet High Tide
Sat -- 06:15 PM HST     Sunset
Sat -- 09:01 PM HST     Moonset
Sat -- 10:58 PM HST     0.22 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.91.41.92.22.32.21.91.51.10.80.70.711.31.71.91.91.81.410.60.30.2

Tide / Current Tables for Honuapo, Hawaii Island, Hawaii
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Honuapo
Click for Map
Sat -- 05:39 AM HST     2.37 feet High Tide
Sat -- 06:11 AM HST     Sunrise
Sat -- 09:16 AM HST     Moonrise
Sat -- 11:39 AM HST     0.67 feet Low Tide
Sat -- 05:20 PM HST     1.95 feet High Tide
Sat -- 06:17 PM HST     Sunset
Sat -- 09:04 PM HST     Moonset
Sat -- 11:31 PM HST     0.22 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.20.61.11.62.12.32.42.21.81.310.70.70.81.11.51.81.91.91.71.30.90.50.2

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 (8,2,3,4)
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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.