Sunday, August25, 2019 L-36.com


Marine Weather and Tides
Captain Cook, 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 6:02AMSunset 6:42PM Sunday August 25, 2019 5:41 AM HST (15:41 UTC) Moonrise 1:15AMMoonset 2:49PM Illumination 24% Phase: Waning Crescent; Moon at 25 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- 339 Am Hst Sun Aug 25 2019
.small craft advisory in effect through early Monday morning...
Today..West of the big island, winds variable less than 10 knots becoming west 10 knots in the afternoon. NEar south point, east winds to 25 knots. Wind waves 9 feet. Isolated showers through the day.
Tonight..West of the big island, west winds 10 knots in the evening becoming variable less than 10 knots. NEar south point, east winds to 25 knots. Wind waves 9 feet. Isolated showers through the night.
Monday..West of the big island, southwest winds 10 knots in the morning becoming variable less than 10 knots. NEar south point, east winds to 25 knots. Wind waves 7 feet. Isolated showers.
Monday night..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 7 feet. Isolated showers through the night.
Tuesday..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 6 feet.
Tuesday night..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 4 feet. Southwest swell 3 feet. Isolated showers in the evening.
Wednesday..Winds variable less than 10 knots west of the big island...east 10 knots near south point. Wind waves 4 feet. Southwest swell 3 feet.
Thursday..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 4 feet. Southwest swell 3 feet. Isolated showers.
PHZ100 339 Am Hst Sun Aug 25 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 today. As the high weakens and moves away from the islands, trade winds gradually decrease Monday through Wednesday.


7 Day Forecast for Marine Location Near Captain Cook, HI
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location: 19.46, -155.96     debug


Area Discussion for -
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Fxhw60 phfo 251357
afdhfo
area forecast discussion
national weather service honolulu hi
400 am hst Sun aug 29 2019

Synopsis
Trade wind weather will continue through Monday, 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. Winds will slowly slack beginning Tuesday
through the rest of the week as a low pressure develops far north of
the area, with a mixed trade wind and land and sea breezes weather
regime expected.

Discussion
A surface high pressure centered far north of the state will
continue to bring moderate to locally breezy trade wind to the area
through Monday. Meanwhile, a mid level ridge will remain near the
islands as well, and serve to keep airmass in the island vicinity
mainly stable. Both early morning lihue and hilo soundings pretty
much confirmed airmass stability, with trade wind inversion based at
around 6 to 7 thousand feet. Furthermore, hilo sounding is slightly
drier, with precipitable water near one and three quarter of an
inch. Latest satellite imagery indicated a line of low clouds spread
across the windward areas from the big island to oahu, and will
reach kauai in the next few hours. Radar data indicated these
showers are passing the islands somewhat swiftly, and are affecting
mainly windward and mountain areas. Due to the quick movement of
these showers in a mostly stable airmass, precipitation amounts will
stay mostly on the light side.

Do expect current weather pattern to persist through Monday. Hence,
trade wind weather will prevail, with mainly light windward and
mauka showers expected. Afternoon and evening clouds and showers are
also expected over the leeward big island slopes.

Changes in the weather are expected beginning Tuesday, as the high
current far north of the area is forecast to weaken and move off to
the northeast. Moreover, a low pressure system is expected to
develop far north of the area. This will result in the trade winds
to slowly weaken quite a bit over the later half of the week.

Localized land and sea breezes may develop under this lighter trade
wind regime. Forecast charts only showed a slight increase in
airmass instability. Thus, shower activity will be highly dependent
on available moisture and still be primarily focused over windward
and mauka areas. Daytime heating may allow for afternoon clouds and
showers to develop over interior sections as well as over the
leeward big island slopes.

Aviation
High pressure north-northeast of hawaii continues to bring breezy
trade winds to the state. Airmet tango continues for mechanical
turbulence downwind of all the mountains below 8,000 feet. This
airmet will likely continue through today and into tonight with
little change in winds expected.

Vfr conditions are expected to prevail with passing MVFR conditions
in passing clouds and showers primarily over windward slopes.

Marine
Fresh to strong easterly trade winds will spread westward today
as high pressure holds far north of the state and a surface trough
northwest of kauai moves away. The small craft advisory (sca) has
been expanded from the typically windy waters around the big
island and maui to briefly cover maui county windward waters and
the kaiwi channel today. 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 at summertime background levels for the
next couple of 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.

Expect a slight and brief increase in east shore surf today 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 today as
a small pulse of northwest swell diminishes.

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

Small craft advisory until 6 pm hst this evening for kaiwi
channel-maui county windward waters.

Discussion... Hui
aviation... M ballard
marine... Powell


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 40 mi59 min NNE 2.9 G 6 81°F 83°F1012.7 hPa
ILOH1 - 1617760 - Hilo, HI 51 mi53 min WSW 2.9 G 5.1 74°F 82°F1014.7 hPa

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI13 mi69 minENE 310.00 miMostly Cloudy79°F71°F79%1012.9 hPa

Link to 5 minute data for PHKO

Wind History from HKO (wind in knots)
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Last 24hrE3E4CalmSW7SW9S10S11SW9SW9W7W74--W44--SW3----SE5SE5SE4E4E3
1 day agoE6SE5SE4S4SW8SW8SW8SW10W10W9SW9--W6----SW4S6S5SE4E3SE3E3CalmCalm
2 days agoNE3E3S5S5SW8SW9SW10SW9SW9W11--------SE11
G17
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Tide / Current Tables for Napoopoo, Kealakekua Bay, Hawaii Island, Hawaii
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Napoopoo
Click for Map
Sun -- 01:14 AM HST     Moonrise
Sun -- 04:49 AM HST     0.26 feet Low Tide
Sun -- 06:06 AM HST     Sunrise
Sun -- 12:32 PM HST     2.22 feet High Tide
Sun -- 02:49 PM HST     Moonset
Sun -- 06:44 PM HST     Sunset
Sun -- 07:58 PM HST     0.53 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.90.80.60.40.30.30.40.60.91.31.722.22.221.81.41.10.80.60.50.60.70.9

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
Click for Map
Sun -- 01:14 AM HST     Moonrise
Sun -- 04:47 AM HST     0.24 feet Low Tide
Sun -- 06:06 AM HST     Sunrise
Sun -- 12:23 PM HST     2.22 feet High Tide
Sun -- 02:49 PM HST     Moonset
Sun -- 06:44 PM HST     Sunset
Sun -- 07:41 PM HST     0.49 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.90.80.60.40.30.20.30.60.91.31.722.22.221.71.310.70.50.50.60.70.9

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 (11,2,3,4)
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Ground Weather Radar Station South Shore, 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.