Saturday, August17, 2019 L-36.com


Marine Weather and Tides
Kahaluu-Keauhou, 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 6:00AMSunset 6:48PM Saturday August 17, 2019 3:05 PM HST (01:05 UTC) Moonrise 8:37PMMoonset 7:54AM Illumination 94% Phase: Waning Gibbous; Moon at 17 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- 951 Am Hst Sat Aug 17 2019
Rest of today..Southwest winds 10 knots west of the big island...east 20 knots near south point. Wind waves 7 feet. SWell west 3 feet. Isolated showers through the day.
Tonight..East winds 10 knots west of the big island...east 20 knots near south point. Wind waves 7 feet. SWell west 3 feet. Isolated showers.
Sunday..West of the big island, southeast winds 10 knots veering southwest in the afternoon. NEar south point, east winds 20 knots. Wind waves 6 feet. SWell west 3 feet. Isolated showers in the morning.
Sunday night..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 5 feet. Isolated showers.
Monday..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 5 feet.
Monday night..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 4 feet. South swell 3 feet. Isolated showers.
Tuesday..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves 4 feet. South swell 4 feet. Isolated showers.
Wednesday..West of the big island, southeast winds 10 knots veering west in the afternoon, then backing east. NEar south point, east winds 20 knots. Wind waves 5 to 7 feet. South swell 3 to 4 feet. Scattered showers.
PHZ100 951 Am Hst Sat Aug 17 2019
Synopsis for hawaiian coastal waters.. A surface high pressure system far northeast of the islands will weaken from this weekend into early next week. A new surface high is forecast to build far north of the state by the middle of next week.


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 171944
afdhfo
area forecast discussion
national weather service honolulu hi
944 am hst Sat aug 17 2019

Synopsis
The high pressure ridge north of the hawaiian islands will weaken
today with light trade winds forecast on Sunday and Monday. Expect
increasing trade winds by the middle of next week along with
elevated humidity levels and some enhanced shower activity as two
low level troughs pass south of the state.

Discussion
Shower activity was enhanced this morning as a weak low level trough
continues to drift through the islands. Numerous showers were
observed over the typical windward and mauka areas with isolated
to scattered showers developing over leeward slopes. This low
level trough will drift west of the islands later today with
decreasing showers through the afternoon hours.

A mid-latitude trough passing through the central pacific will
weaken the high pressure ridge north of the islands today,
decreasing trade wind speeds on Sunday and Monday. Onshore sea
breezes caused by day time surface heating will develop over each
island with offshore land breezes each night. Drier trends are
forecast for the next few days under the subsidence from a strong
upper level ridge. The trade wind subsidence inversion heights
will range from 5000 to 7000 feet through Monday afternoon.

By Monday evening the weather pattern begins to change as
additional low level troughs move into the hawaii region. The
first of these trough arrives from Monday night through Tuesday
morning with some enhanced showers developing mainly along
windward slopes of each island. A second tropical disturbance is
now forecast to pass south of the big island on Tuesday night with
potentially less impacts on rainfall and humidity levels across
the islands by Wednesday. Trade wind speeds will increase starting
on Tuesday, as the ridge builds north of the islands and this
trough passes to the south of the state. Moderate to locally
breezy trades are forecast from Wednesday onward. Higher chances
for elevated moisture levels and showers will linger over the big
island from Tuesday to Thursday with lower precipitation impacts
for the rest of the state. We will probably trend precipitation
chances downward, in the afternoon forecast grids, across the
western islands for the Wednesday through Thursday time periods.

Moderate to locally breezy trades are forecast to continue on Friday
and next Saturday as the high pressure ridge builds in north of
the islands. An upper level cut off low drops in from the north
likely enhancing shower regional shower activity especially in the
overnight and early morning hours.

Aviation
A 1024 mb surface high far to the northeast of the state will
bring light to moderate easterly trade winds through this
afternoon. This flow will help generate isolated showers along
the windward slopes and coastal areas this afternoon, which are
forecast to become scattered after Sun down. Brief MVFR conditions
will remain possible tonight due to reduced visibility and
mountain obscuration from low clouds and showers.

Airmet sierra remains in effect through 20z for islands east of
kauai due to tempo mountain obscuration above 2000 feet, though
conditions will likely improve by late this morning.

Marine
A surface high pressure system far northeast of the state will
gradually weaken this weekend, which will cause the trade winds
to diminish slightly through early next week. A new surface high
pressure system building far north of the state by the middle of
next week is expected to cause the trade winds to gradually
strengthen starting next Wednesday. We may see the return of small
craft advisories for the typical windy areas around maui and the
big island during the second half of next week.

Small south and southwest swells will maintain background
summertime surf along south facing shores this weekend. A large,
long-period south-southwest swell arriving Monday is expected to
peak Tuesday, then gradually lower through the rest of next week.

Latest observations from the pago pago buoy is indicating the
swell running higher than the wavewatch 3 model. This suggests
surf heights may near high surf warning levels for a brief time
during its peak along south facing shores on Tuesday.

The current west swell produced by tropical cyclones in the
northwest pacific will continue to slowly decline through Monday.

Surf heights produced by this lingering swell will be largest
along shorelines with a westerly exposure. A small northwest swell
will be possible from next Thursday through Friday. Modest surf
will persist along east facing shores today, then will slowly
subside from Sunday through early next week as the trade winds
weaken.

For additional details on swells and surf, please see the latest
collaborative nearshore swell and wind forecast for oahu (srdhfo)
product.

Hfo watches warnings advisories
None.

Discussion... Bohlin
aviation... Jt
marine... Kino


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 30 mi72 min WSW 5.1 G 7 82°F 84°F1015.3 hPa
ILOH1 - 1617760 - Hilo, HI 49 mi66 min ENE 5.1 G 7 82°F 82°F1016.1 hPa (-1.5)
KLIH1 - 1615680 - Kahului Bay, Maui, HI 93 mi72 min NE 20 G 24 82°F 1015.4 hPa

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI3 mi2.2 hrsSW 1110.00 miPartly Cloudy87°F73°F65%1015.2 hPa

Link to 5 minute data for PHKO

Wind History from HKO (wind in knots)
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Last 24hrSW10SW9SW8------SW9S7--E7SE5SE6--E3E3E4NE5N4SW5SW8SW11SW11SW11SW9
1 day agoSW10--SW7SW5SW5--SW3--S4CalmSE6----E6--CalmSE5SE5SW7S9SW8SW7W7W9
2 days agoW8W8NW7W6NW4CalmCalmE3SE5E5E6E5E5E5SE6E5E45W7NW7W9--W9W6

Tide / Current Tables for Kailua Kona, Big Island, Hawaii (2)
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Kailua Kona
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Sat -- 04:43 AM HST     1.26 feet High Tide
Sat -- 06:04 AM HST     Sunrise
Sat -- 07:54 AM HST     Moonset
Sat -- 10:16 AM HST     0.30 feet Low Tide
Sat -- 05:00 PM HST     2.08 feet High Tide
Sat -- 06:50 PM HST     Sunset
Sat -- 08:37 PM HST     Moonrise
Sat -- 11:51 PM HST     0.34 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.50.811.21.31.10.90.70.40.30.30.60.91.31.722.121.71.410.60.4

Tide / Current Tables for Napoopoo, Kealakekua Bay, Hawaii Island, Hawaii
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Napoopoo
Click for Map
Sat -- 04:53 AM HST     1.26 feet High Tide
Sat -- 06:04 AM HST     Sunrise
Sat -- 07:53 AM HST     Moonset
Sat -- 10:26 AM HST     0.30 feet Low Tide
Sat -- 05:10 PM HST     2.08 feet High Tide
Sat -- 06:50 PM HST     Sunset
Sat -- 08:37 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.50.711.21.31.210.70.50.30.30.50.81.21.61.92.121.81.410.70.4

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 Kohala, 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.