Saturday, July20, 2019 L-36.com


Marine Weather and Tides
Wainaku, HI

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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 5:50AMSunset 7:02PM Saturday July 20, 2019 12:46 PM HST (22:46 UTC) Moonrise 9:59PMMoonset 9:05AM Illumination 85% Phase: Waning Gibbous; Moon at 19 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- 949 Am Hst Sat Jul 20 2019
Rest of today..East winds 15 knots. Wind waves 6 feet. Scattered showers late in the morning, then isolated showers in the afternoon.
Tonight..East winds 15 knots. Wind waves 5 feet. Isolated showers in the evening, then scattered showers after midnight.
Sunday..East winds 15 knots. Wind waves 5 feet. SWell southeast 3 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Sunday night..East winds 20 knots. Wind waves 5 feet. SWell southeast 3 feet. Isolated showers in the evening. Isolated Thunderstorms through the night. Showers after midnight.
Monday..East winds 20 knots. Wind waves 5 feet. SWell southeast 3 feet. Showers in the morning. Isolated Thunderstorms through the day. Numerous showers in the afternoon.
Monday night..East winds 15 knots. Wind waves 5 feet. SWell southeast 3 feet. Numerous showers and isolated Thunderstorms in the evening, then scattered showers after midnight.
Tuesday..East winds 20 knots. Wind waves 5 feet. SWell southeast 3 feet. Scattered showers.
Wednesday..East winds 20 knots. Wind waves 5 to 6 feet. SWell southeast 3 feet. Scattered showers.
PHZ100 949 Am Hst Sat Jul 20 2019
Synopsis for hawaiian coastal waters.. High pressure will remain north to northeast of the region through the upcoming week. Weak low pressure will pass south of the state early next week.


7 Day Forecast for Marine Location Near Wainaku, HI
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location: 19.73, -155.06     debug


Area Discussion for -
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Fxhw60 phfo 202010
afdhfo
area forecast discussion
national weather service honolulu hi
1010 am hst Sat jul 20 2019

Synopsis
A broad area of high pressure far north of the islands will
continue to feed the islands with locally breezy trade winds
through at least the middle of next week. There could be a boost
in enhanced trade wind showers between Monday and Tuesday,
especially the eastern end of the island chain, in association
with a low level disturbance passing south of the islands and the
interaction with an upper level low northwest of the islands.

Discussion
A well anchored surface high north of the islands will be the
continuing source for trade winds for the area through at least
the middle of next week. These trade winds will be mainly be in
the moderate to locally strong range.

There has been some late changes with what the models have
instore for the islands in the next 72 hours or so. From what was
a benign, uneventful, trade wind pattern, models are now suggesting
a disturbance to pass south of the islands between Monday and
early Tuesday time frame. The disturbance will be accompanied by
tropical moisture that will sweep across the area from east to
west. Further more, an upper low at 500 mb is located 355 miles
north-northwest of kauai now. It is forecast to deepen slightly in
the next 36 hours while remaining in that general vicinity
through early Monday morning, before moving further away from the
islands. By Tuesday afternoon the upper low is expected to be 700
miles west-northwest of kauai. Both the gfs, ecmwf, and nam, are
in pretty good agreement with this scenario, although the ec is a
few hours behind the GFS with the onset of the weather. Current
grids have thunderstorms slated for the big island Monday morning,
as per GFS solution.

Comparing the latest satellite imagery with the models, there is
a presence of low level low 460 miles south of south point, fitting
the models solution. The models weakens this low to a strong
trough as it pushes west- northwestward through Sunday, then
northwest through Monday night, running parallel to the island
chain. The upper low northwest of kauai, with its southerly winds
aloft, will be helping steer the trough's course. Perhaps the
question mark is how much tropical moisture will be accompanying
this trough. We hope to have a clearer picture by this evening.

Current grids have thunderstorms for the big island beginning Monday
morning, and keeping the smaller islands out of this unsettled
weather for now. With the upper low being weaker and some 900
miles away, the weather will return to regular trades by Tuesday
night or Wednesday.

Currently, satellite imagery shows broken low clouds coverage
upwind of the islands, especially upwind of maui and the hamakua
coast. Some dissipation is expected with these clouds, but not
all. So expect some passing showers for the rest of the day, and
perhaps this evening for maui.

Aviation
A high will remain nearly stationary far north of the main hawaiian
islands and maintain locally strong east winds over the area.

Airmet tango is in effect for moderate turbulence below 7,000ft
and this airmet will likely continue into Sunday.

The east winds will carry scattered to broken low clouds over
windward areas. Later today clouds and showers will develop over
the southwest slopes of the big island and maui. We expectVFR
conditions to prevail and we do not expect to have to issue
airmet sierra today.

Marine
Fresh to locally strong easterly trades are forecast to continue
through next week as high pressure remains positioned north-northeast
of the area. The stronger winds will remain across the typically
windier locations from maui county to the big island due to
terrain accelerations. The current small craft advisory remains
in place for these areas through Sunday and will likely need to
be extended into early next week.

Rough surf will continue along east facing shores each day due to
strong onshore winds. Heights are forecast to slightly trend down
through the latter half of the weekend into early next week due to
the upstream trades trending down.

Surf along south facing shores will remain small through the
weekend, then trend up through the first half of the upcoming week
due to a recent system passing through near the tasman sea.

Heights should remain below advisory levels as this south-
southwest swell moves through and peaks Monday through Tuesday. In
addition to this long-period source, a combination of small south
to southeast swells will be enough to keep the surf from going
flat along southern exposures through midweek.

A south-southeast (150-160 deg) long-period swell associated with
a compact gale that has developed southeast of the tuamotus will
be possible late next week with a peak around Thursday night into
Friday. Surf will rise along exposed shores but should remain
below advisory levels.

See the latest oahu surf discussion (srdhfo) for additional
details on surf and swell.

Hfo watches warnings advisories
Small craft advisory until 6 pm hst Sunday for maalaea bay,
pailolo and alenuihaha channels, and waters south of the
big island.

H lau donaldson kino


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 0 mi47 min ENE 9.9 G 12 80°F 82°F1014.8 hPa (-0.5)
51206 6 mi31 min 81°F7 ft
KWHH1 46 mi53 min W 7 G 9.9 81°F 83°F1013.9 hPa

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, HI1 mi54 minE 910.00 miMostly Cloudy82°F68°F63%1015.2 hPa

Wind History from HTO (wind in knots)
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Last 24hrE9E10NE10NE10NE9NE6NE3E9SE3E3E6W3W6W3W4SW3SW4W5SW4W4S4CalmE11E9
1 day agoN6NE13N5NE14NE9W5W3SE6W7W6W4W3SW4CalmS5SW6CalmW3SW5W3CalmE3E8E9
G15
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E7E6CalmNE3SW3SW4SW3W4SW3SW3SW4SW4SW4W5W63NW5NE8N7NE9

Tide / Current Tables for Hilo, Hilo Bay, Kunio Bay, Hawaii Island, Hawaii
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Kawaihae
Click for Map
Sat -- 01:07 AM HST     0.18 feet Low Tide
Sat -- 05:54 AM HST     Sunrise
Sat -- 06:25 AM HST     1.00 feet High Tide
Sat -- 09:08 AM HST     Moonset
Sat -- 11:33 AM HST     0.27 feet Low Tide
Sat -- 06:34 PM HST     2.15 feet High Tide
Sat -- 07:04 PM HST     Sunset
Sat -- 10:01 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.20.20.40.70.9110.80.60.40.30.30.40.71.11.61.92.12.121.61.20.8

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (18,4,5,8)
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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.