Saturday, August24, 2019 L-36.com


Marine Weather and Tides
Princeville, HI

Version 3.4
NOTICE
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:12AMSunset 6:56PM Saturday August 24, 2019 3:26 PM HST (01:26 UTC) Moonrise 12:35AMMoonset 2:10PM Illumination 30% Phase: Waning Crescent; Moon at 24 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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PHZ111 Kauai Windward Waters- 933 Am Hst Sat Aug 24 2019
Rest of today..East winds 15 knots. Wind waves 5 feet. SWell north 3 feet. Scattered showers, then isolated showers in the afternoon.
Tonight..East winds 20 knots. Wind waves 6 feet. SWell north 3 feet. Scattered showers.
Sunday..East winds 20 knots. Wind waves 6 feet. Scattered showers in the morning.
Sunday night..East winds 20 knots. Wind waves 6 feet. Isolated showers in the evening, then scattered showers after midnight.
Monday..East winds 15 knots. Wind waves 6 feet. Isolated showers in the morning, then scattered showers in the afternoon.
Monday night..East winds 15 knots. Wind waves 5 feet. Scattered showers.
Tuesday..East winds 10 knots. Wind waves 4 feet. Southwest swell 3 feet. Scattered showers.
Wednesday..East winds 10 knots. Wind waves 3 feet. Southwest swell 3 feet. Isolated showers.
PHZ100 933 Am Hst Sat Aug 24 2019
Synopsis for hawaiian coastal waters.. High pressure far north of the state will drive fresh to strong trade winds into Monday, with the strongest winds due on Sunday. As the high weakens and moves away from the islands, trade winds gradually decrease Monday through Wednesday.


7 Day Forecast for Marine Location Near Princeville, HI
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location: 22.22, -159.48     debug


Area Discussion for -
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Fxhw60 phfo 241949
afdhfo
area forecast discussion
national weather service honolulu hi
949 am hst Sat aug 24 2019

Synopsis
A trade wind weather pattern can be expected over the next few
days, thanks to high pressure far north of the area. Clouds and
passing light showers will tend to favor windward and mauka areas
with most leeward locations remaining dry. Trade winds will become
lighter during the middle and latter half of next week as the high
moves off to the northeast. A few passing light showers can be
expected mainly over windward and mauka area.

Discussion
Satellite imagery shows patches of low clouds embedded in low
level easterly trade wind flow. This is providing for some passing
light showers over windward and mauka areas with most leeward
locations remaining dry. Expect these conditions to continue
through the day today with some clouds and showers possible for
the leeward big island slopes during the afternoon and evening
hours.

Surface high pressure is centered far north of the state. This
places the islands in a moderate to locally breezy trade wind
environment. Aloft, there is a mid level ridge in place over the
area. This is providing for a rather stable airmass to be in place
across the state. Thus any showers that do form will tend to be
on the lighter side due to inhibited cloud growth. Precipitable
water values are currently running between 1.2 inches and 1.4
inches across the area. However satellite derived precipitable
water values of 1.6 to 1.8 inches is present just east of maui and
the big island. Model guidance shows this higher moisture content
moving into the eastern islands later today and tonight. This may
cause a bit of an uptick in showers over windward areas of maui
the the big island this afternoon and tonight with lesser of an
increase in shower activity expected over the rest of the state.

The surface high will continue to keep moderate to breezy trade
winds in place through Monday while the upper ridge will keep
inversion heights low with only light windward and mauka showers
expected. Afternoon and evening clouds and showers are also
expected over the leeward big island slopes.

During the Tuesday through Friday time frame, the high is forecast
to weaken and move off to the northeast. This will cause our trade
winds to weaken to the light to locally moderate range. Localized
land and sea breezes may develop under this lighter trade wind
regime. Meanwhile, the state is forecast to lie between a mid
level ridge northwest of the state and a mid level trough just
east of the state. Thus instability will be limited under this
scenario. Shower activity will be highly dependent on incoming
moisture availability and primarily focused over windward and
mauka area. Daytime heating may allow for some afternoon shower
development over interior areas as well as over the leeward big
island slopes.

Aviation
High pressure center still north-northeast of hawaii and will
continue to bring breezy easterly tradewinds to the state.

Although we haven't had any recent reports of turbulence, will
keep airmet tango in effect for low level turbulence below
8,000ft. Airmet tango will probably be in effect through Sunday.

Expect showers and low level clouds to be mainly confined to the
north thru east sections of all islands on the windward slopes
but any MVFR conditions should be passing. Otherwise, expectVFR
conditions for the rest of the state.

Marine
Fresh to strong easterly trade winds, already in place across big
island and maui waters, will spread westward on Sunday as high
pressure holds far north of the state and a surface trough
northwest of kauai moves away. The small craft advisory (sca) that
is in place for the typically windy waters around the big island
and maui will need to be briefly expanded to additional waters.

Trades will gradually decrease during the first half of the work
week as the high weakens and drifts to the northeast. The SCA will
likely be trimmed back to the typically windy waters on Monday
and should be dropped entirely by Tuesday.

South shore surf will be below summer average for the next few
days, and a southwest swell out of the tasman sea is due to arrive
Tuesday and peak Wednesday and Thursday. Islands in the southwest
pacific usually block a significant amount of energy from swell
sources out of the tasman sea, but we could see inconsistent sets
above august average during the peak. This swell will decrease
heading into next weekend.

Rough, short period trade wind energy is coming in at 6 ft 7
seconds, which is right around august average. Expect a slight
and brief increase in east shore surf on Sunday as trades
strengthen, followed by a gradual decline to near average
conditions on Monday and well below august average for the
remainder of the week. Small north shore surf will fade tomorrow
as the current small pulse of northwest swell diminishes.

Hfo watches warnings advisories
Small craft advisory until 6 pm hst Sunday for maalaea bay-
pailolo channel-alenuihaha channel-big island leeward waters-big
island southeast waters.

Discussion... Burke
aviation... Chevalier
marine... Wroe


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51208 7 mi56 min 5 ft
NWWH1 - 1611400 - Nawiliwili, HI 20 mi56 min NE 9.9 G 14 83°F 1014.6 hPa
51201 - Waimea Bay, HI (106) 82 mi44 min 78°F4 ft
51WH0 - WHOTS - Woods Hole Ocean Time-series 91 mi56 min ESE 18 82°F 72°F

Wind History for Nawiliwili, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lihue, Lihue Airport, HI18 mi93 minENE 1210.00 miMostly Cloudy87°F73°F63%1014.8 hPa
Kekaha, Pacific Missile Test Facility Barking Sands, HI19 mi90 minWNW 1010.00 miA Few Clouds89°F72°F57%1013.6 hPa

Link to 5 minute data for PHLI

Wind History from HLI (wind in knots)
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Last 24hrNE11--------NE16NE8E13E16E16E14E15E13E15E15E9E10E10E13E11--E14E12E12
1 day ago--------------NE8--NE8NE8--E9--E6E7E7--NE7NE9NE9--NE10NE7
2 days agoNE14----NE15----------N10NE14E17NE11----N10N10N14NE16N13N17----N13

Tide / Current Tables for Hanalei Bay, Kauai Island, Hawaii
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Hanalei Bay
Click for Map
Sat -- 12:35 AM HST     Moonrise
Sat -- 02:12 AM HST     0.32 feet Low Tide
Sat -- 06:18 AM HST     Sunrise
Sat -- 10:26 AM HST     1.91 feet High Tide
Sat -- 02:10 PM HST     Moonset
Sat -- 05:37 PM HST     0.68 feet Low Tide
Sat -- 07:02 PM HST     Sunset
Sat -- 09:46 PM HST     0.86 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.40.30.40.50.711.31.61.81.91.91.81.51.210.80.70.70.70.80.80.90.8

Tide / Current Tables for Hanamaulu Bay, Kauai Island, Hawaii
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Hanamaulu Bay
Click for Map
Sat -- 12:34 AM HST     Moonrise
Sat -- 03:38 AM HST     0.32 feet Low Tide
Sat -- 06:17 AM HST     Sunrise
Sat -- 11:37 AM HST     1.81 feet High Tide
Sat -- 02:09 PM HST     Moonset
Sat -- 07:01 PM HST     Sunset
Sat -- 07:03 PM HST     0.68 feet Low Tide
Sat -- 10:57 PM HST     0.76 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.70.50.40.30.30.40.60.81.11.41.71.81.81.71.51.310.80.70.70.70.70.70.8

Weather Map and Satellite Images
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wmap_P
GOES Local Image of Hawaii    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (21,6,7,8)
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Ground Weather Radar Station Kauai, HI
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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.