Thursday, March23, 2017 L-36.com


Marine Weather and Tides
Kahaluu-Keauhou, HI

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:19AMSunset 6:33PM Thursday March 23, 2017 6:21 AM HST (16:21 UTC) Moonrise 3:14AMMoonset 2:49PM Illumination 16% Phase: Waning Crescent; Moon at 26 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- 334 Am Hst Thu Mar 23 2017
Today..West of the big island...winds variable less than 10 kt becoming northwest 10 kt in the afternoon. NEar south point... East winds 20 kt. Wind waves 5 ft. Northwest swell 4 ft. Haze. Isolated showers.
Tonight..Winds variable less than 10 kt west of the big island...east 20 kt near south point. Wind waves 5 ft. Northwest swell 4 ft. Haze through the night. Isolated showers in the evening. Scattered showers after midnight.
Friday..West of the big island...winds variable less than 10 kt becoming west 10 kt in the afternoon. NEar south point...east winds 20 kt. Wind waves 5 ft. Northwest swell 4 ft. Haze through the day. Scattered showers in the morning. Isolated showers in the afternoon.
Friday night..Winds variable less than 10 kt west of the big island...east to 25 kt near south point. Wind waves 5 ft. Northwest swell 3 ft. Haze. Isolated showers.
Saturday..Southwest winds 10 kt west of the big island... East to 25 kt near south point. Wind waves 8 ft. Northwest swell 4 ft. Haze.
Saturday night..Winds variable less than 10 kt west of the big island...east to 25 kt near south point. Wind waves 8 ft. Northwest swell 6 ft increasing to 8 ft after midnight. Haze through the night. Isolated showers after midnight.
Sunday..West of the big island...west winds 10 kt becoming variable less than 10 kt. NEar south point...east winds to 25 kt. Wind waves 7 to 8 ft. Northwest swell 8 ft. Haze. Isolated showers.
Monday..West of the big island...northwest winds 10 kt veering northeast. NEar south point...east winds to 25 kt. Wind waves 6 to 7 ft. Northwest swell 6 to 8 ft. Haze. Isolated showers.
PHZ100 334 Am Hst Thu Mar 23 2017
Synopsis for hawaiian coastal waters.. A ridge to the north will weaken through Friday followed by a new high building north of the area over the weekend. A very large west northwest swell will affect the area Saturday through early 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 231419
afdhfo
area forecast discussion
national weather service honolulu hi
419 am hst Thu mar 23 2017

Synopsis
Expect mainly dry trade wind weather through early Friday, with
brief trade showers mainly along windward facing slopes,
especially over the eastern end of the island chain. Trade wind
speeds are forecast to strengthen again starting late Friday, with
a slight increase in trade showers expected mainly over windward
sections this weekend.

Discussion
The western end of a surface ridge appears to be about 260 miles
north of lihue based on an ascat pass from late Wednesday evening.

A surface front is also located about 525 miles north of lihue.

The close proximity of the front has weakened the surface ridge,
and this has caused the pressure gradient to become relatively
slack across the islands early this morning. As a result, trade
wind speeds have continued to diminish overnight, especially over
the western end of the state, where background surface winds are
from an east-southeast direction. This weaker flow also allowed
local land breeze circulations to develop over the leeward and
interior sections of many of the islands.

Aloft, water vapor imagery continues to show a middle tropospheric
ridge near the big island, which is maintaining relatively stable
atmospheric conditions across the islands. Elsewhere, the axis of
an upper tropospheric short-wave trough is evident about 415 miles
west of lihue. This feature is moving rapidly toward the east-
northeast. The main influence this trough aloft appears to be
having on island weather are thin high clouds, mainly cirrus,
which are streaming rapidly toward the east-northeast across the
western islands this morning. These translucent clouds will
partially block sunshine over some areas in a few hours after
sunrise.

The cold front north of the region is forecast to continue
pushing eastward. This will keep the western end of the weak
surface ridge close to the islands, with east to east-southeast
surface winds. Note that the weaker background flow will likely
allow local afternoon sea breezes and nighttime land breezes to
develop over leeward and interior sections of the individual
islands, especially on kauai and oahu, through tonight.

The early morning sounding from hilo shows moistening overnight
compared with Wednesday afternoon, since the most recent
precipitable water (pw) value increased to 1.27 inches.

Elsewhere, the lihue sounding still showed relatively dry
conditions, with a pw value of 1.05 inches. In addition, the low-
level trade wind inversion has increased to around 8 thousand
feet at hilo, while it remains below 6 thousand feet at lihue.

The latest forecast guidance continues to indicate additional
low-level moisture will be advected over the eastern islands
today. Satellite derived pw values of 1.3 inches extend a few
hundred miles upstream from the big island. Therefore, expect the
low-level flow to bring additional low clouds and showers from
the east-southeast toward the big island, and possibly maui, from
this morning into Friday.

The middle tropospheric ridge will likely erode near the eastern
end of the state during the next couple of days. This is due in
part to the short-wave trough moving by just to the north of the
islands during the next 18 to 30 hours. Once this feature is
northeast of the big island, the models suggest a sharp upper
tropospheric trough will develop east and northeast of the big
island starting later tonight or Friday, and persist into this
weekend. This may allow some additional increase in inversion
heights, especially near the windward big island this weekend.

High pressure will gradually build north of the area after the
front dissipates, resulting in an increase in trade wind speeds.

The trades will also likely be from a more typical east-northeast
direction starting late Friday, and continuing through this
weekend. In addition, as the inversion heights gain altitude this
weekend, expect an increase in trade wind showers, particularly
along windward facing slopes of the eastern islands. The models
also show a new high moving to a position far north of the islands
late Saturday. The pressure gradient south of this feature will
maintain locally breezy trade winds at least into Monday as it
continues moving toward the east-northeast. There may be some
fluctuations in trade speeds starting around Monday night or
Tuesday. In addition, trade showers may also increase over some
windward sections from Tuesday into the middle of next week.

Aviation
A cold front passing well north of the state will weaken the high
pressure ridge, decreasing the strength of the trade winds and
keeping the wind direction more east to southeasterly. Cloud
remnants from an old frontal boundary to our east will drift into
eastern sections of the hawaiian islands with isolated to
scattered MVFR ceilings and a few showers in the forecast. Expect
mostlyVFR conditions elsewhere.

No airmets are in effect at this time.

Marine
A surface high is currently located far northeast of the area
with a surface ridge trailing west to about 200nm north of kauai.

The high will move east and the ridge will weaken over the next
couple of days as two fronts pass to the north of the state.

Winds are expected to remain below small craft advisory (sca)
speeds through Friday.

The surface ridge will strengthen again north of the area starting
Friday. Winds are expected to reach SCA strength by Saturday and may
reach near-gale strength around the big island and maui over the
weekend as a new high builds north of the area. Surf along east
facing shores will increase a bit again as well, with the
strengthening trade winds.

A storm east of japan will produce a very large west-northwest
swell reaching the islands Saturday. Surf from this swell will be
well above the advisory threshold through early next week and may
reach warning levels, most likely on kauai and niihau, where surf
heights will be largest. Those islands will block some of the
swell, so surf heights will be somewhat lower on the rest of the
smaller islands. As this swell subsides next Tuesday, a new
moderate northwest swell (from around 320 deg)is expected to
arrive.

Hfo watches/warnings/advisories
None.

Discussion... Houston
aviation... Bohlin
marine... Ts


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 30 mi52 min E 1 G 1.9 73°F 79°F1019.1 hPa
ILOH1 - 1617760 - Hilo, HI 49 mi52 min SSW 6 G 7 72°F 76°F1019.1 hPa
KLIH1 - 1615680 - Kahului Bay, Maui, HI 93 mi52 min WNW 4.1 G 6 72°F 78°F1019.3 hPa
51203 - Kaumalapau, HI (146) 98 mi37 min 78°F4 ft

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI3 mi29 minENE 710.00 miFair73°F59°F62%1018.6 hPa

Wind History from HKO (wind in knots)
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Last 24hrSE4SE7S8S10SW9SW9SW10W9W8SW9SW8S7S8S8SE7SE8E6E6E6E3E5E6E6E7
1 day agoCalmE3SW7SW8S10SW11S10SW13SW8S9S8S8S8N10NE7N5NW4W6N5NE6NE4CalmCalmE3
2 days agoCalmNE53S8SW9S8S7SW7S8S9S11S10S8S8S6NE7SE6E12E18NE17
G24
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Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
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Thu -- 12:43 AM HST     1.84 feet High Tide
Thu -- 03:13 AM HST     Moonrise
Thu -- 06:25 AM HST     Sunrise
Thu -- 07:43 AM HST     0.16 feet Low Tide
Thu -- 01:06 PM HST     0.98 feet High Tide
Thu -- 02:49 PM HST     Moonset
Thu -- 06:35 PM HST     Sunset
Thu -- 06:38 PM HST     0.14 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.81.81.71.41.10.70.40.20.20.30.50.70.910.90.80.50.30.20.20.30.611.4

Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Kawaihae
Click for Map
Thu -- 01:05 AM HST     1.95 feet High Tide
Thu -- 03:13 AM HST     Moonrise
Thu -- 06:24 AM HST     Sunrise
Thu -- 08:06 AM HST     0.30 feet Low Tide
Thu -- 01:33 PM HST     1.09 feet High Tide
Thu -- 02:47 PM HST     Moonset
Thu -- 06:35 PM HST     Sunset
Thu -- 06:58 PM HST     0.28 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.81.91.91.71.310.60.40.30.40.50.70.91.11.110.80.50.30.30.40.611.4

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 (12,3,4,5)
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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.