Thursday, July18, 2019 L-36.com


Marine Weather and Tides
Hilo, HI

Version 3.4
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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 5:49AMSunset 7:03PM Wednesday July 17, 2019 8:45 PM HST (06:45 UTC) Moonrise 8:01PMMoonset 6:33AM Illumination 99% Phase: Waning Gibbous; Moon at 16 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- 330 Pm Hst Wed Jul 17 2019
.small craft advisory in effect through Friday afternoon...
Tonight..East winds to 25 knots. Wind waves 7 feet. SWell southeast 3 feet. Isolated showers in the evening, then scattered showers after midnight.
Thursday..East winds to 25 knots. Wind waves 6 feet. Scattered showers.
Thursday night..East winds to 25 knots. Wind waves 7 feet. Scattered showers.
Friday..East winds to 25 knots. Wind waves 7 feet. Scattered showers.
Friday night..East winds 15 knots. Wind waves 7 feet. SWell southeast 3 feet. Scattered showers.
Saturday..East winds 15 knots. Wind waves 6 feet. SWell southeast 3 feet. Scattered showers in the morning. Isolated showers in the afternoon.
Saturday night..East winds 15 knots. Wind waves 5 feet. Scattered showers through the night.
Sunday..East winds 15 knots. Wind waves 4 to 5 feet. SWell southeast 3 feet. Scattered showers.
Monday..East winds 15 knots. Wind waves 4 feet. SWell southeast 3 feet. Scattered showers.
PHZ100 330 Pm Hst Wed Jul 17 2019
Synopsis for hawaiian coastal waters.. High pressure north of the state will keep breezy to strong trades in place through Friday. The trades will then ease over the weekend as the high weakens.


7 Day Forecast for Marine Location Near Hilo, HI
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location: 19.72, -155.08     debug


Area Discussion for -
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Fxhw60 phfo 180140
afdhfo
area forecast discussion
national weather service honolulu hi
340 pm hst Wed jul 17 2019

Synopsis
Typical summertime weather is expected through the weekend, with
locally breezy trade winds delivering clouds and passing showers to
windward areas, while most leeward areas remain dry. On the big
island, leeward areas will see clouds and showers every afternoon
and evening.

Discussion
A typical summertime weather regime is in place, and is expected to
remain so into next week. Surface high pressure centered to the
distant N will weaken slightly Friday, with breezy ene trade winds
easing somewhat for the weekend. A low aloft will linger in the
island vicinity, allowing low clouds arriving on the trade wind flow
to drop a few showers, mainly over windward areas - although a few
will drift over to leeward areas on the smaller islands. Meanwhile,
the kona side of the big island will see clouds and showers every
afternoon and evening due to upslope flow driven by daytime heating.

High-resolution goes-17 visible imagery shows fewer low clouds
immediately upstream of the islands as compared to this morning,
with a smattering of randomly distributed low clouds dotting skies
between the islands and 150w. With pwat expected to drop to a near
normal ~1.2" in the short term, a near normal trade shower
distribution is expected overnight into Thursday.

Between 150w and 140w at the latitude of the islands, a broken to
overcast mix of stable and showery low clouds is noted, associated
with an increase in pwat to near ~1.7". Guidance is consistent in
depicting the leading edge of this increased moisture arriving
Thursday morning on the big island, spreading westward through the
day, and arriving on oahu in the afternoon. This will likely bring
an increase in windward showers, and keep skies a little cloudier
than normal, with the bulk of this moisture moving W of all islands
by Friday morning. Thereafter, models indicate low level moisture
streaming in from the E that will likely keep a seasonal windward
shower regime intact.

While the nearby low aloft will drift N over the next day or so, it
will move back toward the islands on Friday, with the associated e-w
oriented trough becoming n-s oriented over the islands. Models do
not depict significant destabilization of the lower portions island
atmosphere, but incoming cumuli will be able to grow sufficiently
tall to drop showers as the subsidence inversion is weakened.

Additionally, periods of high clouds are possible from Thursday
through Saturday due to instability aloft, with the high clouds
potentially becoming thick over parts of the state at times. Outside
chance of high-based convection developing over the big island upper
slopes the next couple of days, but since it didn't happen today, it
won't be included in the forecast for now.

Aviation
High pressure north of the aloha state continues to drive moderate
to breezy trades across the area. Phog was gusting to 40kts earlier
this afternoon, but winds should be continuing to trend down into
the evening and overnight hours. Clouds and showers that have
favored mainly windward coasts and slopes today will also be on the
decline overnight as an upper level disturbance moves away from the
island chain.VFR conditions are expected to prevail for most
locations, with brief periods of MVFR conditions possible for
windward areas this evening.

Airmet tango remains in effect below 7000 ft for areas south through
west of mountain ranges due to tempo moderate turbulence.

Marine
High pressure north of the state will keep breezy to strong trades
in place through Friday. The trades are expected to ease slightly
over the weekend, as high pressure to the north weakens. The small
craft advisory (sca) remains in effect and has been expanded to
include all coastal zones. Winds are expected to trend down over the
weekend, when the SCA may be scaled back to just the typically windy
areas around maui county and the big island.

The current south swell will continue to slowly subside through
tonight, with only small background south and southwest swells
expected Thursday through the weekend. A modest increase in south
shore surf is possible early next week as a pair of overlapping
southwest swells move through. Locally strong trade winds will
produce choppy waves along east facing shores into the weekend, with
a boost through Friday as the upstream fetch of trade winds has been
increasing (although surf is expected to remain just below advisory
levels). Surf will slowly lower over the weekend on east shores as
trades ease.

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

Small craft advisory until 6 pm hst Friday for kauai northwest
waters-kauai windward waters-kauai leeward waters-kauai channel-oahu
windward waters-oahu leeward waters-kaiwi channel-maui county
windward waters-maui county leeward waters-big island windward
waters.

Discussion... Birchard
aviation... Dye
marine... Kinel


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 1 mi45 min E 2.9 G 4.1 80°F 81°F1016.9 hPa (+1.3)
51206 7 mi29 min 81°F8 ft
KWHH1 45 mi51 min SSW 5.1 G 8 84°F 83°F1015.1 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 mi52 minENE 310.00 miMostly Cloudy78°F66°F69%1017.2 hPa

Wind History from HTO (wind in knots)
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Last 24hrE84CalmCalmW3SW4SW4SW4SW6SW5CalmE5E6SW6W10W10W4SW4E10E10
G20
E7E6CalmNE3
1 day agoSW4E5SW4SW4SW5SW5SW5SW5SW5SW6SW5SW34SE6E12E13SE10SE7SE11S7E10CalmE6E5
2 days agoW5SW4W4W6W5SW4SW4SW4SW3SW4SW4W33NE8NE8NE12NE12
G17
NE9NE9NE6NE5N6E5Calm

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
Thu -- 12:01 AM HST     0.16 feet Low Tide
Thu -- 04:57 AM HST     0.90 feet High Tide
Thu -- 05:53 AM HST     Sunrise
Thu -- 07:27 AM HST     Moonset
Thu -- 10:14 AM HST     0.01 feet Low Tide
Thu -- 05:27 PM HST     2.41 feet High Tide
Thu -- 07:05 PM HST     Sunset
Thu -- 08:46 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.20.40.70.80.90.80.60.40.100.10.30.71.21.82.22.42.42.11.71.20.80.4

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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Wind Forecast for (2,6,7,8)
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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.