Wednesday, June19, 2019 L-36.com


Marine Weather and Tides
Hilo, 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 5:40AMSunset 7:02PM Wednesday June 19, 2019 7:32 AM HST (17:32 UTC) Moonrise 9:21PMMoonset 7:48AM Illumination 95% Phase: Waning Gibbous; Moon at 17 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- 317 Am Hst Wed Jun 19 2019
Today..East winds 15 knots. Wind waves 5 feet. Isolated showers.
Tonight..East winds 15 knots. Wind waves 5 feet. Isolated showers.
Thursday..East winds 15 knots. Wind waves 4 feet. Isolated showers.
Thursday night..East winds 15 knots. Wind waves 4 feet. Isolated showers.
Friday..East winds 15 knots. Wind waves 4 feet. Isolated showers.
Friday night..Southeast winds 15 knots. Wind waves 4 feet. Isolated showers.
Saturday..East winds 15 knots. Wind waves 4 feet. Isolated showers.
Sunday..East winds 15 knots. Wind waves 3 to 4 feet. Isolated showers.
PHZ100 317 Am Hst Wed Jun 19 2019
Synopsis for hawaiian coastal waters.. A high will remain far northeast of the area through Saturday. A trough west of the area will deepen over the second half of the week.


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 191340
afdhfo
area forecast discussion
national weather service honolulu hi
340 am hst Wed jun 19 2019

Synopsis
Moderate to locally breezy trade winds will deliver just a few brief
windward showers through Thursday, but then winds will weaken and
shift to the southeast from Friday through the weekend. The lighter
winds will lead to daytime sea breezes, spotty showers and muggy
conditions.

Discussion
The current synoptic features affecting island weather include a
broad ridge aloft, a persistent surface trough to the nw, and the
trade wind supporting high centered far to the ne. A ridge from this
high extends SW to about 450 miles N of the islands, and the
pressure gradient S of these features is supporting locally breezy
trade winds which are currently delivering a field of primarily
stable broken to overcast low clouds, with these clouds dropping a
few windward showers. Overnight soundings indicate a stable island
atmosphere capped near 7000 feet, and little windward rainfall is
expected in the short term, while leeward areas will be mostly dry.

Relatively thin high clouds are possible into Friday, but they may
briefly thicken on Thursday due to the passage of a weak trough
aloft.

While little significant change is expected with the high to the ne
into next week, the trough to the NW will become reinvigorated by a
developing closed low aloft beginning Thursday. This cutoff low and
associated trough aloft is expected to linger NW of the islands well
into next week, supporting the development of several weak surface
lows, while also causing the persistent trough axis to drift closer
to the islands. The ridge to the N will move over the islands in
response, causing winds to weaken and veer to the S and SE along the
w end of the island chain, with light to moderate E to SE winds near
the big island.

Initially, this flow looks to support only limited showers, although
increasing surface dew points will combine with the diminished winds
to bring increasing mugginess. As the deep-layer trough axis nears
kauai Friday night and Saturday, models indicate increasing moisture
advecting northward over waters W of kauai, which could lead to a
period of showery weather over kauai county as well. Meanwhile, a
mostly dry weather pattern is expected over the remainder of the
state through Saturday.

Later in the weekend into early next week, there is increased
uncertainty as to where clouds and showers will occur (and when),
due to the veered wind flow and gradually increasing low-level
moisture. While mostly dry weather (outside of a few brief showers),
will continue over the big island, the other islands could see
spotty showers from Sunday into Wednesday. Some showers could form
in the afternoons over interior areas due to daytime heating and sea
breeze convergence, with others forming within eddies and cloud
plumes peeling off other islands, potentially bringing much needed
showers to leeward areas, with a chance of briefly heavy downpour.

Additionally, conditions will be warm and muggy.

Long range outlook presented by latest gfs ECMWF guidance has
delayed the return of trade winds until the end of next week, as low
pressure lurking NW of the islands continues to veer and weaken the
normally-expected trade winds.

Aviation
Most of the shower activity early this this morning is off to the
southwest of the island chain although there are a few showers on
the windward sides of the islands. Relatively strong high pressure
far to the northeast of hawaii will remain stationary through the
period. This will keep light to moderate trade winds from the
east northeast through at least tonight. There will be fairly stable
conditions with drier air over most parts the islands. Most of the
shower activity will be confined to the windward slopes, especially
on maui and the big island. Winds will be moderate again this
afternoon in the same areas as Tuesday but they should not be strong
enough to produce strong low level turbulence.

There are currently no airmets in effect.

Marine
A surface high far northeast of the area will maintain locally
strong trade winds over the coastal waters through tonight. The
small craft advisory has been extended through tonight for the
pailolo and alenuihaha channels and waters south of the big island.

Winds will weaken and shift out of the southeast beginning Thursday
as a trough deepens west of the offshore waters. The southeast flow
will be partly blocked by the big island, resulting in light winds
around the smaller islands Friday through the weekend.

Existing small surf will fade even more today and remain well below
the advisory threshold along all shores through the coming weekend.

A small boost in east shore surf is possible as a short-period,
northeast swell builds over the weekend.

Fire weather
A red flag warning (rfw) for extreme fire behavior requires that the
keetch-byram drought index (kbdi) be greater than 600 (it's
currently near 670, while normal for this time of year is near 510),
sustained wind speeds be greater than 19 mph, and rh be less than 46
percent - for two hours or more - based on observations at phnl.

While sustained winds are not expected to reach criteria for the
issuance of a rfw, dry fuels combined with rh values near 50% around
midday will combine with the locally gusty trade winds to bring
increased fire weather concerns today and Thursday. Decreasing winds
and increasing rh vales from Friday onward will diminish those
concerns.

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

Discussion fire weather... Birchard
aviation... Chevalier
marine... Ts


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 1 mi45 min SSW 1.9 G 2.9 73°F 78°F1016.2 hPa
51206 7 mi47 min 78°F7 ft
KWHH1 45 mi45 min Calm G 1.9 1015 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 mi40 minSW 310.00 miMostly Cloudy74°F66°F79%1016.6 hPa

Wind History from HTO (wind in knots)
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Last 24hrW54E3S9SE53SE13SW4N3E3SE7SE4W4CalmS3CalmCalmW3CalmCalmSW3SW4SW5SW5
1 day agoW4SW5SE9E15SE7SE10E13
G21
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2 days agoCalmCalm6NE9E7E10E10E8
G16
E9E7E7NW4W5CalmSW5SE3CalmCalmCalmSW43S3S5W3

Tide / Current Tables for Hilo, Hawaii Island, Hawaii
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Hilo
Click for Map
Wed -- 04:12 AM HST     1.01 feet High Tide
Wed -- 05:41 AM HST     Sunrise
Wed -- 07:47 AM HST     Moonset
Wed -- 09:17 AM HST     0.06 feet Low Tide
Wed -- 04:53 PM HST     2.62 feet High Tide
Wed -- 07:01 PM HST     Sunset
Wed -- 09:20 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.40.60.9110.80.50.20.10.10.30.71.21.72.22.52.62.52.11.71.20.70.4

Tide / Current Tables for Kawaihae, Big Island, Hawaii (2)
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Kawaihae
Click for Map
Wed -- 12:49 AM HST     0.12 feet Low Tide
Wed -- 05:11 AM HST     0.51 feet High Tide
Wed -- 05:44 AM HST     Sunrise
Wed -- 07:50 AM HST     Moonset
Wed -- 10:13 AM HST     -0.04 feet Low Tide
Wed -- 05:53 PM HST     2.12 feet High Tide
Wed -- 07:05 PM HST     Sunset
Wed -- 09:24 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.10.20.30.40.50.50.40.20-000.20.50.91.41.822.121.71.30.90.5

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 (13,3,4,5)
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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.