Wednesday, June28, 2017 L-36.com


Marine Weather and Tides
Leilani Estates, 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 5:43AMSunset 7:04PM Tuesday June 27, 2017 9:06 PM HST (07:06 UTC) Moonrise 9:35AMMoonset 10:34PM Illumination 18% 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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PHZ122 Big Island Windward Waters- 336 Pm Hst Tue Jun 27 2017
Tonight..East winds 20 knots. Wind waves 5 feet. SWell northeast 4 feet. Isolated showers.
Wednesday..East winds 20 knots. Wind waves 5 feet. SWell northeast 4 feet. Isolated showers.
Wednesday night..Northeast winds 20 knots. Wind waves 5 feet. SWell northeast 4 feet. Isolated showers in the evening, then scattered showers after midnight.
Thursday..Northeast winds 20 knots. Wind waves 5 feet. SWell northeast 4 feet. Isolated showers in the morning, then scattered showers in the afternoon.
Thursday night..Northeast winds 20 knots. Wind waves 5 feet. SWell northeast 4 feet. Scattered showers.
Friday..Northeast winds 20 knots. Wind waves 5 feet. SWell northeast 4 feet. Scattered showers.
Friday night..East winds 15 knots. Wind waves 4 feet. SWell northeast 3 to 4 feet. Scattered showers in the evening, then showers likely after midnight.
Saturday..East winds 15 knots. Wind waves 3 feet. SWell northeast 3 feet. Showers likely.
Sunday..East winds 15 knots. Wind waves 5 to 6 feet. Southeast swell 3 feet and northeast 3 feet. Scattered showers.
PHZ100 336 Pm Hst Tue Jun 27 2017
Synopsis for hawaiian coastal waters.. A surface high far northeast of the state will maintain fresh to strong trade winds this week.

7 Day Forecast for Marine Location Near Leilani Estates, HI
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location: 19.4, -154.93     debug


Area Discussion for -
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Fxhw60 phfo 280641
afdhfo
area forecast discussion
national weather service honolulu hi
841 pm hst Tue jun 27 2017

Synopsis
Breezy trade winds associated with high pressure north of the state
will continue through Thursday, before slightly trending down over
the upcoming weekend. Dry and stable conditions will limit shower
activity over the state through Thursday, with the best chances
favoring windward and mauka areas. A slight increase in windward and
mauka shower coverage will be possible Friday through the weekend as
a weak upper disturbance moves into the area from the east.

Discussion
Recently animated water vapor loop showed plenty of middle- to upper-
level moisture pooling northward across the state due to a weak
upper low centered several hundred miles west-southwest of kauai.

This moisture was supporting mostly transparent high clouds lifting
northward over the state this evening, with the best coverage over
the northwest islands. At the surface, the latest analysis showed a
ridge of high pressure positioned north of the area that was
supporting breezy trade winds currently in place. The afternoon
upper air soundings exhibited strong subsidence inversions with very
dry profiles (lihue inversion down to around 5 kft). Precipitable
water (pw) values came in just under an inch at lihue and only up to
1.25" at hilo. The latest satellite-derived pw imagery reflected
this dry air and didn't indicate any potential near-term changes or
moisture surges upstream of the islands within the trades.

The latest short-term model guidance has initialized well with the
current pattern and continues to depict dry and stable conditions
persisting through Thursday. The previously discussed high clouds
will likely remain over portions of the state into Wednesday
before clearing out as the weak upper low shifts westward and away
from the state. Model pw values will remain around and slightly
below average for this time of year through Thursday. This will
support below average rainfall chances, with the best chances
favoring windward and mauka areas through the late night and early
morning periods. Trade winds will remain breezy each day with
strong gusts, especially through the afternoon periods.

Friday through the upcoming weekend, the latest guidance remains in
decent agreement and supports an upper low, currently centered
several hundred miles northeast of the big island, cutting off and
drifting back toward the state. Guidance also depicts a weak surface
and mid-level reflection (subtle trough) approaching and moving over
the islands from east to west. Model pws are forecast to increase to
above average due to a rise in low- to mid-level moisture moving
into the area associated with these features. Lowering upper heights
combined with a weak surface trough and higher moisture will support
increasing trade wind shower activity. Trade winds are forecast to
weaken but hold in the moderate to locally breezy range.

Early next week, guidance supports dry and stable conditions
returning as the previously discussed upper low shifts west of the
islands an fills. Trade winds are forecast to strengthen and become
breezy with locally strong gusts as high pressure remains north of
the state.

Aviation
Expect aVFR evening ahead as a trade wind regime continues
across the main hawaiian islands. Low cloud coverage diminishes
from the big island westward, with both oahu and kauai having the
least coverage thus far. A slight increase in cloud coverage is
expected overnight across the windward waters, and the moderate to
strong trade winds will help carry some of the these clouds
ashore, favoring the windward and mountain areas. Brief MVFR cigs
are expected in these parts of the larger islands, primarily
windward big island and parts of windward maui. Due to a strong
inversion, which ranges from 5k feet at lihue to 75 hundred feet
at hilo, only light brief showers are expected with no restriction
to visibility. These showers will be accompanied by MVFR cigs
with bases around 25 hundred feet. Except for a pop up showers
along the kona coast overnight, leeward sectors of all islands
will beVFR.

A broken to overcast layer of cirrus, above fl200, is affecting
primarily oahu and kauai. This cirrus is expected to thin out
Wednesday morning.

As noted above, the low level trades are quite breezy with a few
of the terminals. Coupled with a strong inversion, airmet tango
for low level turb will continue beyond 16z.

There are no other airmets in effect, and none is expected
overnight.

Marine
The small craft advisory (sca) now includes the kaiwi channel,
maui windward waters, oahu leeward waters, the typical windy
zones around maui and the big island. The sca GOES through
Thursday, and may continue for some zones into Friday, followed
by slightly weaker trade winds this weekend.

The locally strong trades combined with a small northeast swell
will produce choppy surf along east facing shores through the
week. A small short-period northwest swell is also forecast from
Friday into this weekend.

Small pulses of swell energy from the southeast through southwest
will continue bringing near normal summertime surf along south
facing shores into mid-week. Reinforcing long-period south swells
will generate a slight bump in surf heights from Thursday into
this weekend.

Hfo watches warnings advisories
Small craft advisory until 6 pm hst Thursday for oahu leeward
waters-kaiwi channel-maui county windward waters-maalaea bay-
pailolo channel-alenuihaha channel-big island leeward waters-big
island southeast waters.

Discussion... Gibbs
aviation... Lau
marine... Morrison


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 24 mi54 min NNW 1 G 4.1 77°F 79°F1018.6 hPa
51206 26 mi69 min 79°F7 ft

Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hilo, Hilo International Airport, HI23 mi73 minWSW 310.00 miOvercast76°F69°F79%1018.7 hPa

Wind History from HTO (wind in knots)
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Last 24hrSW4CalmSW3SW4SW5W4SW5SW6SE3NW4NE4SW5N6N6N8NE13N7NE11SE5E6CalmNE5W3W5
1 day agoSW3SW3CalmCalmW7SW4SW6SW7SW6SW5SW5SE6SE8SE8E8E9
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2 days agoW6SW6SW4SW5SW63SW6SW6SW8SW7SW333E9E9E11E12SE9E7E6E5SE4SE3SW3

Tide / Current Tables for Hilo, Hilo Bay, Kunio Bay, Hawaii Island, Hawaii
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Hilo
Click for Map
Wed -- 01:17 AM HST     0.31 feet Low Tide
Wed -- 05:44 AM HST     Sunrise
Wed -- 06:32 AM HST     1.24 feet High Tide
Wed -- 10:32 AM HST     Moonrise
Wed -- 12:02 PM HST     0.22 feet Low Tide
Wed -- 07:02 PM HST     Sunset
Wed -- 07:05 PM HST     2.40 feet High Tide
Wed -- 11:18 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.30.40.50.81.11.21.21.10.80.50.30.20.30.611.51.92.32.42.321.61.1

Tide / Current Tables for Honuapo, Hawaii Island, Hawaii
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Honuapo
Click for Map
Wed -- 01:50 AM HST     0.31 feet Low Tide
Wed -- 05:47 AM HST     Sunrise
Wed -- 07:10 AM HST     1.26 feet High Tide
Wed -- 10:35 AM HST     Moonrise
Wed -- 12:35 PM HST     0.22 feet Low Tide
Wed -- 07:03 PM HST     Sunset
Wed -- 07:43 PM HST     2.43 feet High Tide
Wed -- 11:20 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.70.40.30.40.70.91.21.31.210.70.40.30.20.40.81.21.72.12.42.42.21.91.4

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 (3,6,7,8)
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Ground Weather Radar Station South Shore, 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.