Thursday, August22, 2019 L-36.com
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Marine Weather and Tides
Koloa, 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 6:11AMSunset 6:58PM Thursday August 22, 2019 8:18 AM HST (18:18 UTC) Moonrise 11:51PMMoonset 12:17PM Illumination 54% Phase: Third Quarter Moon; Moon at 22 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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PHZ113 Kauai Channel- 338 Am Hst Thu Aug 22 2019
Today..Northeast winds 20 knots. Wind waves 4 feet. Mixed swell south 3 feet and northwest 3 feet. Isolated showers through the day.
Tonight..Northeast winds 15 knots. Wind waves 4 feet. SWell northwest 3 feet. Isolated showers in the evening, then scattered showers after midnight.
Friday..East winds 15 knots. Wind waves 3 feet. SWell northwest 3 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Friday night..East winds 15 knots. Wind waves 4 feet. SWell northwest 3 feet. Isolated showers through the night.
Saturday..East winds 20 knots. Wind waves 4 feet. Isolated showers through the day.
Saturday night..East winds 20 knots. Wind waves 6 feet. Isolated showers through the night.
Sunday..East winds 15 knots. Wind waves 6 to 7 feet. Isolated showers.
Monday..Northeast winds 15 knots. Wind waves 5 to 6 feet. Isolated showers.
PHZ100 338 Am Hst Thu Aug 22 2019
Synopsis for hawaiian coastal waters.. High pressure north of the state will maintain moderate to locally strong trade winds through Friday, then briefly decrease Friday night as a trough nears the state. High pressure will restrengthen northeast of the area over the weekend.

7 Day Forecast for Marine Location Near Koloa, HI
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location: 21.9, -159.48     debug

Area Discussion for -
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Fxhw60 phfo 221335
afdhfo
area forecast discussion
national weather service honolulu hi
335 am hst Thu aug 22 2019

Synopsis
Trade winds will weaken briefly late Friday through early
Saturday, then return to the moderate to breezy range late
Saturday through the second half of the weekend. Clouds and
showers will favor windward and mountain locations, especially
through the overnight and early morning periods as pockets of
higher moisture move through. The exception will be over the
leeward areas of the big island, where afternoon and evening
clouds and showers form in response to the local sea breeze. Warm
and humid conditions will become a possibility Tuesday through
midweek as the trades trend down into the light and variable
range.

Discussion
The latest surface analysis showed a weakness within the
subtropical ridge due to an upper low and dissipating surface
trough several hundred miles north to northeast of the islands.

Despite this weakness, breezy trades are holding over the islands.

Clouds and showers are focusing over the typical windward and
mountain locations. Rainfall accumulations have remained light
over the past six hours (through 2 am hst), ranging from a few
hundredths to a quarter of an inch.

The short-term guidance remains in good agreement and depicts the
trades trending down briefly Friday through early Saturday as the
aforementioned upper low and surface trough pass to the north
from east to west. An upward trend in windward shower coverage
can't be ruled over kauai tonight into Friday as the moisture axis
associated with the trough moves through (pws near two inches).

Elsewhere, mostly dry conditions will prevail with clouds and
showers favoring windward and mountain locations.

Moderate to breezy trades will return over the weekend as the upper
low and surface trough continue westward and high pressure builds to
the north. An increase in shower coverage will be possible late
Saturday into Sunday as a pocket of higher moisture moves through
from east to west. Model pws within this pocket of higher moisture
climb into the 1.75 to 1.9 inch range over the big island late
Saturday, then to the smaller islands Saturday night into Sunday.

For the extended, guidance remains in decent agreement through the
first half of the week and shows a weakness developing within the
 ridge as a broad upper trough and surface front pass to the
north. The pressure gradient is forecast to respond and weaken
over the state, which could be enough for a land and sea breeze
regime to become established Tuesday through midweek. If this
scenario evolves, clouds and showers will favor interior areas
through the afternoon and evening periods.

Aviation
Some trade wind showers during the pre-dawn hours will bring some
brief MVFR conditions to some windward locations of the smaller
islands. Otherwise, expectingVFR conditions to prevail. High
pressure north of the islands will maintain a relatively stable
trade wind flow. Cloud tops are reaching near 8000 feet. Airmet
tango is in place for mechanical turbulence to the lee of the
mountains. The airmet is expected to continue into tonight.

Marine
High pressure to the north will maintain mostly fresh trades
through Friday. The typical windy areas around maui and the big
island will continue to see locally strong trades through
at least tonight and possibly into Friday. Thus, the small craft
advisory (sca) has been extended through tonight for the
typically windy waters around maui and the big island. A trough
approaching north of the state Friday will briefly ease the trade
winds Friday night to below SCA levels. A new high building
northeast of the islands will then strengthen the trades back to
moderate and locally strong levels over the weekend, with scas
likely being required once again for the windier marine zones.

The high surf advisory for south facing shores has been dropped
and the south swell will continue to lower through the rest of the
week. A series of small long-period south and southwest swells
will move through Sunday through early next week. A larger southwest
swell is possible Tuesday through the second half of next week.

Small northwest swells will linger over the next few days
providing some out of season surf along north facing shores.

Breezy trades will continue to produce small choppy surf along
east facing shores over the next few days. An increase in wind
swell is expected late in the weekend as trades strengthen locally
and upstream of the state.

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

Discussion... Gibbs
aviation... M ballard
marine... Kino

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NWWH1 - 1611400 - Nawiliwili, HI 8 mi54 min N 6 G 8 77°F 1017.9 hPa
51208 27 mi48 min 5 ft
51201 - Waimea Bay, HI (106) 74 mi36 min 78°F4 ft

Wind History for Nawiliwili, HI
(wind in knots)    EDIT      (on/off)   Help
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G16
Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lihue, Lihue Airport, HI9 mi25 minN 103.00 miLight Rain Fog/Mist79°F75°F90%1017.9 hPa
Kekaha, Pacific Missile Test Facility Barking Sands, HI20 mi22 minNE 310.00 miFair83°F71°F67%1017.2 hPa

Link to 5 minute data for PHLI

Wind History from HLI (wind in knots)
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Last 24hrNE15NE12NE12NE13NE13NE15NE14NE14NE16NE14NE15NE13NE16NE17NE14NE15N10NE14E17NE11N10N13N10N10
1 day agoNE13E12E12NE11NE12NE11NE12NE12NE13NE14NE12NE13NE12NE13NE15NE14NE13NE11NE14NE11NE11NE12E13NE13
2 days agoE11NE9NE10NE10NE11NE11NE13NE11NE11NE13NE12NE13NE14NE15NE13NE14NE11NE9NE12E12NE11NE12E11E11
Tide / Current Tables for Port Allen, Hanapepe Bay, Kauai Island, Hawaii
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Port Allen
Click for Map
Thu -- 01:54 AM HST     0.31 feet Low Tide
Thu -- 06:18 AM HST     Sunrise
Thu -- 09:04 AM HST     1.32 feet High Tide
Thu -- 12:17 PM HST     Moonset
Thu -- 03:48 PM HST     0.76 feet Low Tide
Thu -- 07:03 PM HST     Sunset
Thu -- 07:44 PM HST     0.92 feet High Tide
Thu -- 11:51 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.30.30.40.50.70.91.11.31.31.31.21.10.90.80.80.80.80.90.90.90.90.80.7
Tide / Current Tables for Nawiliwili, Hawaii (2)
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Nawiliwili
Click for Map
Thu -- 01:52 AM HST     0.37 feet Low Tide
Thu -- 06:17 AM HST     Sunrise
Thu -- 09:13 AM HST     1.45 feet High Tide
Thu -- 12:16 PM HST     Moonset
Thu -- 03:45 PM HST     0.90 feet Low Tide
Thu -- 07:02 PM HST     Sunset
Thu -- 07:53 PM HST     0.98 feet High Tide
Thu -- 11:50 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.40.40.40.60.811.21.41.41.41.31.21.110.90.90.90.91110.90.7
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 (14,3,4,5)
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Ground Weather Radar Station Kauai, 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.