Thursday, June20, 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 5:40AMSunset 7:02PM Wednesday June 19, 2019 7:51 PM HST (05:51 UTC) Moonrise 9:21PMMoonset 7:48AM Illumination 93% 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- 305 Pm Hst Wed Jun 19 2019
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..Southeast winds 15 knots. Wind waves 4 feet. Isolated showers.
Saturday night..East winds 15 knots. Wind waves 4 feet. Isolated showers through the night.
Sunday..East winds 15 knots. Wind waves 3 to 4 feet. Isolated showers.
Monday..East winds 10 knots. Wind waves 3 feet. Isolated showers.
PHZ100 305 Pm Hst Wed Jun 19 2019
Synopsis for hawaiian coastal waters.. A high will remain far northeast of the area through early next week. A trough west of the area will deepen through Saturday, then shift west slowly.


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 200131
afdhfo
area forecast discussion
national weather service honolulu hi
331 pm hst Wed jun 19 2019

Synopsis
Moderate to locally breezy trade winds will focus showers mainly
across windward areas through Thursday. Winds will weaken and
shift to the southeast from Friday through the weekend, leading to
daytime sea breezes, spotty interior showers, and more muggy
conditions.

Discussion
Water vapor imagery shows an upper level ridge over the state,
with a high far to the northeast and low to the north. At the
surface, high pressure is located far to the northeast with a
ridge extending southwestward from it, passing several hundred
miles north of us. A surface trough has been nearly stationary a
couple hundred miles northwest of kauai. 00z soundings from hilo
and lihue show strong inversions below 6kft. Precipitable waters
range from 1.04 inches in hilo to 1.34 inches inches in lihue,
which is similar to the moisture gradient apparent in mimic total
precipitable water imagery. A loop of tpw shows drier air moving
across the state from the east, with similar values near big
island maui, spreading across molokai lanai toward oahu.

Rainfall amounts today have been limited (mostly less than a
tenth of an inch over the past 12 hours) but with decent coverage
across windward sections, especially kauai and big island. With
drier air moving in from the east and stable conditions remaining
in place, we do not expect any significant rainfall totals tonight
either. Showers will remain focused primarily across windward
sections.

Over the next day or so, a new low will develop and cutoff
northwest of the state. This low will reinvigorate the surface
trough to our northwest, with a surface low developing along it.

While this weather system will be far enough away to limit direct
impacts, it will shift the surface ridge closer to the state.

Initially winds may weaken a touch on Thursday, then moreso from
Friday into the weekend as the direction veers toward the
southeast. The atmosphere over the state will remain relatively
stable with an established inversion. Combined with dry low-level
air, the expectation of limited rainfall will continue through the
work week.

Conditions change a bit this weekend as the deep layer trough low
shift closer to the state. Forecast soundings show inversions
weakening and lifting to 8-10kft near kauai while remaining lower
and more stable farther east. Combined with deeper moisture, this
could lead to a showery period especially across kauai this
weekend, especially Friday night Saturday. Fewer showers are
expected farther east.

Little change is expected in the overall pattern nearby as we head
into next week. The upper trough lifts northward leaving a ridge
in place across the state, keeping the atmosphere stable across
the islands. The surface ridge also remains in place near or just
north of us, keeping the pressure gradient weak and generally from
the east or southeast. This will lead to somewhat of a dry
convective pattern, with onshore winds during the day leading to
cloud buildups across the interiors of the islands. Differences
emerge between the GFS and ECMWF by this point, with the ecmwf
quicker to shift the ridge north and bring back a weak trade wind
pattern. Either way it looks like winds will be on the lighter
side through the extended period.

Aviation
A 1032 mb surface high will continue to sit stagnant far to the
northeast of the state. This will allow for moderate to locally
breezy easterly trade winds to persist across the islands this
evening into tonight. As typical with this type of pattern,
scattered showers will be most concentrated on the windward side
of the islands, especially by late tonight. In addition, a stray
shower or two could spill onto the leeward side.

No airmets are currently in effect.

Marine
A surface high far northeast of the area will maintain locally
strong trade winds over the coastal waters through tonight. Winds
will weaken and shift out of the southeast starting tomorrow 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.

Surf will remain well below the advisory threshold along all
shores through at least early next week. Surf along east facing
shores may rise over the weekend as a short-period, northeast
swell builds.

Fire weather
Fuel conditions are drier than normal, with the keetch-byram
drought index (kbdi) already over the red flag warning threshold
of 600. The relative humidity and wind approached but didn't reach
the other warning thresholds today (45 percent and 19 mph
sustained for two hours at hnl). While we're still not expected
to reach those thresholds on Thursday (wind will likely be the
limiting factor), conditions will be dry and somewhat gusty,
which bring increased fire weather concerns. 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... Bravender
aviation... Thomas
marine... Donaldson


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 0 mi52 min NNE 7 G 8.9 78°F 79°F1014.7 hPa (-0.0)
51206 6 mi36 min 79°F6 ft
KWHH1 46 mi58 min NNW 5.1 G 8 83°F 83°F1013.2 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 mi59 minNNE 610.00 miA Few Clouds78°F66°F67%1015.1 hPa

Wind History from HTO (wind in knots)
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Last 24hrW4CalmS3CalmCalmW3CalmCalmSW3SW4SW5SW5NW3N3NE5N10N8N10NE10NE8NE10NE8NE7NE6
1 day agoS3SW3W4CalmS3W4E3CalmSW44W3SW5W54E3S9SE53SE13SW4N3E3SE7SE4
2 days agoW5CalmSW5SE3CalmCalmCalmSW43S3S5W3W4SW5SE9E15SE7SE10E13
G21
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Tide / Current Tables for Hilo, Hawaii Island, Hawaii
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Hilo
Click for Map
Thu -- 12:36 AM HST     0.22 feet Low Tide
Thu -- 05:04 AM HST     1.01 feet High Tide
Thu -- 05:42 AM HST     Sunrise
Thu -- 08:40 AM HST     Moonset
Thu -- 09:55 AM HST     0.18 feet Low Tide
Thu -- 05:31 PM HST     2.51 feet High Tide
Thu -- 07:01 PM HST     Sunset
Thu -- 10:04 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.20.40.70.910.90.70.50.30.20.30.50.91.41.92.32.52.52.31.91.510.6

Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Kawaihae
Click for Map
Thu -- 01:15 AM HST     0.17 feet Low Tide
Thu -- 05:44 AM HST     Sunrise
Thu -- 06:06 AM HST     0.76 feet High Tide
Thu -- 08:43 AM HST     Moonset
Thu -- 11:03 AM HST     0.14 feet Low Tide
Thu -- 06:30 PM HST     2.33 feet High Tide
Thu -- 07:05 PM HST     Sunset
Thu -- 10:08 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.20.20.40.50.70.80.70.60.40.20.10.20.40.81.31.72.12.32.32.11.71.30.8

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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Wind Forecast for (1,6,7,8)
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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.