Saturday, January20, 2018 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 6:56AMSunset 6:07PM Saturday January 20, 2018 4:26 PM HST (02:26 UTC) Moonrise 9:34AMMoonset 9:31PM Illumination 19% Phase: Waxing Crescent; Moon at 4 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- 332 Pm Hst Sat Jan 20 2018
.small craft advisory in effect through Sunday afternoon...
Tonight..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 4 feet. North swell 3 feet after midnight. SWell east 6 feet. Haze. Isolated showers.
Sunday..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 4 feet. Mixed swell northwest 3 feet and east 6 feet. Haze through the day. Isolated showers in the morning. Scattered showers in the afternoon.
Sunday night..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 5 feet. Mixed swell northwest 4 feet and east 6 feet. Haze through the night. Isolated showers in the evening. Scattered showers after midnight.
Monday..West of the big island, winds variable less than 10 knots becoming west 10 knots in the afternoon. NEar south point, east winds 20 knots. Wind waves 4 feet. Mixed swell northwest 5 feet and east 6 feet. Haze through the day. Showers likely in the morning. Scattered showers in the afternoon.
Monday night..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 5 feet. Mixed swell northwest 6 feet and east 6 feet. Haze through the night. Scattered showers through the night.
Tuesday..West winds 10 knots west of the big island...east 20 knots near south point. Wind waves 6 feet. Mixed swell northwest 5 feet and east 5 feet. Haze. Scattered showers.
Tuesday night..Northwest winds 10 knots west of the big island...east to 25 knots near south point. Wind waves 6 feet. Mixed swell northwest 5 feet and east 5 feet. Haze through the night. Scattered showers through the night.
Wednesday..West of the big island, winds variable less than 10 knots becoming west 10 knots in the afternoon, then becoming variable less than 10 knots. NEar south point, east winds 20 knots. Wind waves 5 to 6 feet. Mixed swell northwest 3 to 4 feet and east 5 to 6 feet. Haze. Scattered showers.
Thursday..West of the big island, northwest winds 10 knots becoming variable less than 10 knots. NEar south point, east winds 15 knots. Wind waves 4 to 5 feet. SWell east 6 feet. Haze. Scattered showers.
PHZ100 332 Pm Hst Sat Jan 20 2018
Synopsis for hawaiian coastal waters.. High pressure east-northeast of the islands will maintain moderate to fresh trade winds into next week. An approaching front will shift winds from the southeast by the middle of the 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 210135
afdhfo
area forecast discussion
national weather service honolulu hi
335 pm hst Sat jan 20 2018

Synopsis
Moderate trade winds will deliver a steady stream of clouds and
showers the next couple of days as moisture associated with a
dissipated front combines with a weak disturbance aloft. Showers
will favor windward and mauka areas, but leeward areas could also
receive some rainfall. Winds may diminish Thursday and Friday.

Discussion
A 1032 mb surface high centered about 1650 miles ene of the islands
has an associated ridge that extends to about 350 miles N of kauai.

The high is supporting moderate to fresh E to ese winds on the large
scale, with the flow veered somewhat from normal due to a front nw
of the area that is weakening the ridge near and W of 160w. An e-w
oriented band of showery low clouds (associated with an old front)
extends for thousands of miles to the E of the big island (all the
way to baja california), with this moisture nw-se oriented over
windward waters. This cloud band has fueled an increase in dew
points as well as clouds and showers, with mostly cloudy skies
prevailing over most of the state this afternoon. Water vapor
imagery highlights a zonal flow aloft over the area, with a weak
trough currently passing over the islands, and a sharper trough
about 700 miles NW of kauai prompting the development of layered
clouds to the W of the area. Afternoon soundings show a weakened and
elevated inversion, with pwat near 1.2 inches.

Radar, satellite and objective analyses highlight an e-w gradient in
wind speeds across the area, with winds stronger to the E due to a
weakness in the pressure gradient near and NW of the islands. As
this convergent flow interacts with the terrain of the big island
and maui, downstream eddies in the wind have been affecting sensible
weather elsewhere in the islands over the past day or so. As an
example, 2 to 4 inches of rain have been recorded in the last 24
hours in the wettest locations on oahu and kauai, with some
unexpected rainfall in leeward areas. Additionally, pilots have been
reporting areas of low-level turbulence and wind shear as they
encounter these eddies. These highly variable features increase
forecast uncertainty in the details of the short-term forecast.

Weak high pressure is expected to build NW of the islands tonight,
reinforced by a stronger high building even farther NW of the area
Sunday and Monday. Moderate to occasionally locally breezy trade
winds will prevail over the area as this occurs, with the flow
backing to a more typical ene to E direction Sunday, continuing
through Tuesday. This should result in clouds and showers having a
more typical windward and mauka distribution. This new high will
then move SE into a position NE of the islands by mid-week, as
developing low pressure to the NW sends a cold front toward the
islands. The approaching front will turn winds to the ese SE again
Wednesday and Thursday, with light and variable winds possible by
the end of the week as the front draws closer.

Forecast models indicate that the aforementioned showery low cloud
band will fuel a somewhat wet trade wind weather pattern for the
next several days (potentially into Wednesday) as it streams in from
the e. The trough aloft to the NW will pass close to the islands
Sunday through Tuesday, and associated cool mid-level temperatures
are expected to make for a slightly unstable atmosphere. While
showers will focus mainly over windward areas, some showers may
develop and or move over leeward areas. Another trough developing w
of the islands later in the week may keep island weather somewhat
unsettled.

Aviation
A persistent band of clouds and showers remains anchored over the
windward slopes and waters this afternoon, and may linger over the
same areas tonight. Airmet sierra is in effect for ifr ceilings and
visibility within the showers for kauai, oahu, molokai, maui and big
island through the afternoon. Airmet sierra will likely continue
through at least the evening hours across windward areas. Leeward
sides of the smaller islands also remain under airmet sierra for
tempo mountain obscurations until this evening. This airmet may need
to be extended into the evening as well.

Airmet tango is in effect for moderate to isolated severe low level
turbulence over and downwind of the terrain of all islands. This
airmet will likely continue through 04z. Moderate turbulence may
continue tonight downstream of the mountains islands.

Marine
Moderate to fresh trade winds will continue over the local waters
with a surface high located east-northeast of the state, moving off
to the east. Another high is forecast to build in behind this one,
continuing the breezy trade wind pattern. Trade wind swell generated
to the east of the state will keep seas above 10 feet through at
least Sunday, so the small craft advisory remains in effect through
Sunday for most zones, but may need to be extended in a later
forecast package. The high surf advisory (hsa) for east facing
shores continues through Sunday as well.

Surf is expected to remain below advisory levels for all other
shores through this weekend. A small northwest swell (330 degrees)
is expected to arrive tonight and fill in Sunday, with a reinforcing
long-period, west-northwest (300 degrees) swell due in Sunday night.

The wnw swell will peak Monday night and gradually decline through
Wednesday. This second swell may warrant an hsa for exposed west and
north facing shores Monday and Tuesday.

Hfo watches warnings advisories
High surf advisory until 6 pm hst Sunday for east facing shores
of kauai oahu molokai maui and the big island.

Small craft advisory until 6 pm hst Sunday for kauai windward
waters-kauai channel-oahu windward waters-kaiwi channel-maui
county windward waters-maalaea bay-pailolo channel-alenuihaha
channel-big island windward waters-big island leeward waters-
big island southeast waters.

Discussion... Birchard
aviation... Almanza foster
marine... Ts


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 30 mi38 min W 5.1 G 5.1 76°F 78°F1013.8 hPa
ILOH1 - 1617760 - Hilo, HI 49 mi44 min SE 2.9 G 5.1 74°F 76°F1015 hPa
KLIH1 - 1615680 - Kahului Bay, Maui, HI 93 mi44 min ENE 13 G 18 76°F 75°F1013.7 hPa

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI3 mi33 minWSW 710.00 miPartly Cloudy80°F64°F60%1013.3 hPa

Wind History from HKO (wind in knots)
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Last 24hrSW8S5S4SE3SE4CalmS4S3E3E4SE5NE4NE3NE3NE3NE4NE3W6W6SW8SW10SW9SW9SW7
1 day agoS9S5CalmSE3SE5SE6SE7SE6E6SE6E6E6SE7E7E6E5SE55W7SW8W7SW8SW8SW7
2 days agoNE19E113S4SE5SE6CalmSE6CalmSE7E7NE5E4E4E4S3SE6S7S7SW8SW9S9S8S9

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
Click for Map
Sat -- 05:49 AM HST     2.02 feet High Tide
Sat -- 07:01 AM HST     Sunrise
Sat -- 09:33 AM HST     Moonrise
Sat -- 12:58 PM HST     0.12 feet Low Tide
Sat -- 06:09 PM HST     Sunset
Sat -- 06:24 PM HST     0.93 feet High Tide
Sat -- 09:30 PM HST     Moonset
Sat -- 11:31 PM HST     0.30 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.30.50.91.31.7221.91.61.20.80.40.20.10.20.40.60.80.90.90.80.60.40.3

Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Kawaihae
Click for Map
Sat -- 06:12 AM HST     2.25 feet High Tide
Sat -- 07:01 AM HST     Sunrise
Sat -- 09:33 AM HST     Moonrise
Sat -- 01:10 PM HST     0.15 feet Low Tide
Sat -- 06:07 PM HST     Sunset
Sat -- 06:42 PM HST     1.13 feet High Tide
Sat -- 09:29 PM HST     Moonset
Sat -- 11:57 PM HST     0.31 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.20.40.81.31.72.12.22.21.91.510.60.30.20.20.40.70.91.11.110.80.60.4

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 (21,6,7,8)
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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.