Tuesday, July23, 2019 L-36.com


Marine Weather and Tides
Laupahoehoe, 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 5:51AMSunset 7:01PM Tuesday July 23, 2019 3:47 AM HST (13:47 UTC) Moonrise 11:40PMMoonset 11:28AM Illumination 61% Phase: Waning Gibbous; Moon at 21 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- 321 Am Hst Tue Jul 23 2019
Today..East winds 20 knots. Wind waves 6 feet. Southeast swell 3 feet. Isolated showers.
Tonight..East winds 20 knots. Wind waves 6 feet. Southeast swell 3 feet. Isolated showers.
Wednesday..East winds 20 knots. Wind waves 5 feet. Southeast swell 3 feet. Isolated showers.
Wednesday night..East winds 15 knots. Wind waves 6 feet. Southeast swell 3 feet. Scattered showers.
Thursday..East winds 15 knots. Wind waves 6 feet. Southeast swell 3 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Thursday night..East winds 15 knots. Wind waves 5 feet. Southeast swell 3 feet. Scattered showers.
Friday..East winds 15 knots. Wind waves 5 feet. Southeast swell 3 feet. Scattered showers.
Saturday..East winds 15 knots. Wind waves 5 feet. Southeast swell 3 feet. Scattered showers.
PHZ100 321 Am Hst Tue Jul 23 2019
Synopsis for hawaiian coastal waters.. High pressure will remain north of the region through the week. An area of low pressure a few hundred miles southwest of kauai will continue to track northwest and weaken through midweek.


7 Day Forecast for Marine Location Near Laupahoehoe, HI
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location: 20.8, -154.34     debug


Area Discussion for -
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Fxhw60 phfo 231345
afdhfo
area forecast discussion
national weather service honolulu hi
400 am hst Tue jul 23 2019

Synopsis
Trade wind weather will prevail over the islands through the rest
of the week, with passing low clouds and showers affecting mainly
windward and mountain areas. A trough of low pressure just southwest
of the islands will bring considerable cloudiness to the smaller
islands today.

Discussion
A little more showers have developed over the western portion of the
island chain overnight as moisture from a trough of low pressure
southwest of the area spread to that area. The trough has also moved
far west enough for stronger trade winds to fill back over much of
area. Early morning hilo sounding revealed a little more stable
airmass, with the return of a trade wind inversion and less overall
moisture, though it is still moist above 10 thousand feet. Early
morning lihue sounding continued to depict a moist and somewhat
unstable airmass, with drier air at the lower to mid levels.

As this trough continues to advance further west-northwest away from
the area today, its influence on the island weather will slowly
diminish. In the mean time, leftover moisture over the western
islands will result in higher rain chances for those islands,
especially kauai. Meanwhile, mid and high clouds from the convection
associated with this system are still covering much of the smaller
islands early this morning, and will keep skies rather cloudy for
those islands today. High pressure far north-northeast of the
islands will provide locally breezy trade winds to the area.

Scattered low clouds embedded in the trade wind flow will reach the
islands at times, bringing some showers to mainly windward areas. In
all, it is pretty much trade wind weather for the area today, except
more showers for the western islands and cloudier due to the mid and
high clouds. A few convective showers may develop over lee areas in
the afternoon and evening on the big island.

High pressure will persist generally far north of the area through
the rest of the week and may strengthen a little toward the weekend.

Meanwhile, an upper level ridge is forecast to move over the region
in the next few days. Expect seasonal drier locally breezy trade
wind weather to prevail under a more stable airmass for the later
part of the week. Forecast solutions continue to show an upper level
trough passing over the state over the weekend. This may result in
an increase in shower coverage in the island vicinity by the weekend
into early next week as the airmass in the area may become less
stable.

Aviation
A high northeast of the area will maintain locally strong east winds
over the area. Airmet tango is in effect for moderate turbulence in
the lee of the mountains.

A low southwest of the area continues to move northwest and weaken.

Layered clouds from the low have been decreasing. Thick layered
clouds still cover kauai county, but the higher clouds have cleared
the big island and have thinned over maui count and oahu.

Thunderstorms associated with the trough have remained southwest of
the islands but will still be possible over the waters southwest of
kauai through this morning.

Low clouds moving over the islands in the low level easterly flow
have been sparse. Localized MVFR ceilings are possible over east
sections of the islands but we do not expect to have to issue airmet
sierra for mtn obsc.

Marine
Fresh to locally strong easterly trades will continue through the
week as high pressure remains north of the area and a weak low
pressure passes to the southwest. 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 effect through Wednesday and will likely need to be
extended through the second half of the week.

Heavy showers and a few thunderstorms will remain possible across
the leeward kauai waters through tonight as the aforementioned area
of low pressure passes.

Choppy surf will continue along east facing shores each day due
to the trades locally and upstream of the islands.

Surf along south facing shores will trend up a notch today through
midweek as a south-southwest swell moves through. The latest
observations from the offshore buoys to the south have trended up
overnight within the 14 to 18 second bands. Surf heights will remain
well below advisory levels as this swell moves through the peaks
today.

As this south-southwest swell eases Wednesday through Thursday, a
new southeast swell associated with a recent gale that developed
over the southern pacific is forecast to move through late Thursday
night. This swell will peak Friday, then lower through the weekend.

Hfo watches warnings advisories
Small craft advisory until 6 pm hst Wednesday for maalaea bay-
pailolo channel-alenuihaha channel-big island leeward waters-big
island southeast waters.

Discussion... Hui
aviation... Donaldson
marine... Gibbs


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 83 mi47 min SW 1.9 G 2.9 73°F 81°F1016.2 hPa (-1.0)

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, HI84 mi54 minWSW 410.00 miMostly Cloudy72°F68°F87%1016.6 hPa

Wind History from HTO (wind in knots)
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Last 24hrSW5SW4W6W7SW4SW7SW5CalmNE7CalmW5W5W4S5SW5SW5SW3CalmW3CalmW3SW3SW4SW4
1 day agoW4W4SW4SW5SW3CalmS3SE10E11SE11E10E12E10SE8SE8SE6S3SE4S4S5SW5W7SW4W4
2 days agoSW3SW4W5SW4W4S4CalmE11E9NE8NE6NE10NE10NE8N6NE8NE5CalmW4SW5CalmCalmW6SW6

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 Hana, Maui Island, Hawaii
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Hana
Click for Map
Tue -- 01:35 AM HST     0.25 feet Low Tide
Tue -- 05:54 AM HST     Sunrise
Tue -- 08:23 AM HST     1.63 feet High Tide
Tue -- 11:34 AM HST     Moonset
Tue -- 01:05 PM HST     0.80 feet Low Tide
Tue -- 07:05 PM HST     Sunset
Tue -- 07:09 PM HST     1.87 feet High Tide
Tue -- 11:46 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.30.30.40.711.31.51.61.61.41.10.90.80.811.31.51.81.91.81.61.31

Weather Map and Satellite Images
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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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Wind Forecast for (9,2,3,4)
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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.