Friday, September22, 2017 L-36.com


Marine Weather and Tides
Kahaluu-Keauhou, 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 6:16PM Friday September 22, 2017 2:01 PM HST (00:01 UTC) Moonrise 8:27AMMoonset 8:25PM Illumination 6% Phase: Waxing Crescent; Moon at 2 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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PHZ123 Big Island Leeward Waters- 933 Am Hst Fri Sep 22 2017
.small craft advisory in effect through late this afternoon...
Rest of today..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 7 feet. SWell southeast 3 feet. Haze.
Tonight..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 6 feet. SWell southeast 3 feet. Haze.
Saturday..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 6 feet. SWell southeast 3 feet. Haze.
Saturday night..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 6 feet. Haze.
Sunday..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 4 feet. Haze.
Sunday night..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 5 feet. Haze. Isolated showers.
Monday..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 4 to 5 feet. Haze. Isolated showers.
Tuesday..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 4 feet. Haze. Isolated showers.
PHZ100 933 Am Hst Fri Sep 22 2017
Synopsis for hawaiian coastal waters.. A ridge of high pressure far north of the state will slowly weaken today. 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 Kahaluu-Keauhou, HI
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location: 19.61, -155.97     debug


Area Discussion for -
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Fxhw60 phfo 221957
afdhfo
area forecast discussion
national weather service honolulu hi
957 am hst Fri sep 22 2017

Synopsis
Breezy trade winds will continue today, then gradually trend down
over the weekend as the ridge of high pressure to the north weakens
and a weak surface trough approaches from the east. A typical
pattern of mainly windward showers will prevail, though interior
and leeward big island will experience extensive afternoon cloud
cover and a few showers each day.

Discussion
A 1030 mb high far northeast of hawaii while a weak trough of low
pressure positioned south of the islands. The pressure gradient
between these two synoptic features continues to support breezy
trade winds across the local area. Satellite-derived precipitable
water imagery and upper air soundings at lihue and hilo reflected
values around normal across much of the state for this time of
year that ranged from 1.2 to 1.4 inches. The exception was near
the southern half of the big island, where higher moisture values
are observed due to the aforementioned surface trough to the
south. Visible satellite shows a few windward and mauka clouds
with mostly sunny skies leeward. Radar shows very little
precipitation blowing in with the trade winds this morning.

The latest short-term model guidance remains in good agreement and
is lining up well with the current pattern and trends around the
state. A general consensus supports breezy trade winds persisting
today, then steadily trending down over the weekend as the high
to the north weakens and the trough south of the big island
continues westward. Mostly dry and stable trade wind weather will
continue each day with clouds and showers favoring windward
locations. Rainfall accumulations will be light, with precipitable
water values holding in the 1-1.3" range (near to below average)
through the weekend.

For the extended (Monday through midweek), light to moderate trades
are expected to persist across the islands due to a weakness within
the ridge north of the state. Clouds and showers will likely favor
windward locations. The GFS and ECMWF both depict a weak surface
trough approaching the islands from the east by midweek. This
combined with a slight increase in moisture, may be enough to bring
the rain chances back to normal over windward locations.

Aviation
High pressure north-northeast of the state will keep a moderate
trade wind flow in place through tonight. Clouds and showers will
favor windward and mauka areas, with isolated spillover showers
trickling over into leeward areas from time to time. Brief MVFR
cigs vsbys in showers, otherwise prevailingVFR conditions
expected all areas.

Airmet tango remains in effect for low level turbulence over and
downwind of the terrain of all islands. This airmet will likely
remain in place through at least the evening hours.

Marine
Fresh to locally strong trades should gradually weaken later today,
decreasing wind speeds into the light to moderate range through
the weekend. Trade winds will continue to bring rough surf along
east facing shores today, easing this weekend.

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
Small craft advisory until 6 pm hst this evening for maalaea bay-
pailolo channel-alenuihaha channel-big island leeward waters-big
island southeast waters.

Discussion... Foster
aviation... Bedal
marine... Ts


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 30 mi44 min WSW 13 G 14 82°F 83°F1014.1 hPa
ILOH1 - 1617760 - Hilo, HI 49 mi44 min NE 8.9 G 11
KLIH1 - 1615680 - Kahului Bay, Maui, HI 93 mi44 min NNE 15 G 21

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI3 mi69 minSSW 1410.00 miPartly Cloudy87°F69°F55%1014 hPa

Wind History from HKO (wind in knots)
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Last 24hrSW11W8S6S7SE104CalmCalmE73SE12CalmE3SE3SE7CalmSE4SE6SE8S13S12S15SW14SW13
1 day agoSW9S8SW6S6S7SE45CalmNE5E3CalmE3N4SE7N6SE3CalmSE11SE12S14S11S13S10SW7
2 days agoSW11SW7SW4W4S3SE7SE7SE5E7SE9SE8E6E8E5E5NE5E4CalmSW3W6SW8SW8SW9SW8

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
Click for Map
Fri -- 05:04 AM HST     1.85 feet High Tide
Fri -- 06:12 AM HST     Sunrise
Fri -- 08:27 AM HST     Moonrise
Fri -- 11:18 AM HST     0.47 feet Low Tide
Fri -- 05:00 PM HST     1.57 feet High Tide
Fri -- 06:19 PM HST     Sunset
Fri -- 08:25 PM HST     Moonset
Fri -- 11:11 PM HST     0.28 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.71.11.51.71.91.81.51.20.90.60.50.50.711.31.51.61.51.310.60.40.3

Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Kawaihae
Click for Map
Fri -- 05:23 AM HST     1.91 feet High Tide
Fri -- 06:12 AM HST     Sunrise
Fri -- 08:26 AM HST     Moonrise
Fri -- 11:33 AM HST     0.25 feet Low Tide
Fri -- 05:23 PM HST     1.62 feet High Tide
Fri -- 06:19 PM HST     Sunset
Fri -- 08:24 PM HST     Moonset
Fri -- 11:29 PM HST     0.07 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.10.40.91.31.71.91.91.61.30.90.50.30.30.40.81.11.41.61.61.410.60.30.1

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 (20,4,5,8)
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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.