Thursday, June20, 2019 L-36.com


Marine Weather and Tides
Halaula, 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 5:41AMSunset 7:02PM Thursday June 20, 2019 1:35 PM HST (23:35 UTC) Moonrise 10:09PMMoonset 8:42AM Illumination 88% Phase: Waning Gibbous; Moon at 18 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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PHZ121 Alenuihaha Channel- 912 Am Hst Thu Jun 20 2019
Rest of today..East winds 20 knots. Wind waves 6 feet. Isolated showers.
Tonight..East winds 20 knots. Wind waves 5 feet. Isolated showers in the evening, then scattered showers after midnight.
Friday..East winds 15 knots. Wind waves 4 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Friday night..East winds 15 knots. Wind waves 3 feet. SWell northeast 3 feet. Scattered showers after midnight.
Saturday..East winds 15 knots. Wind waves 3 feet. SWell northeast 4 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Saturday night..East winds 15 knots. Wind waves 3 feet. Mixed swell southeast 3 feet and northeast 4 feet. Isolated showers in the evening, then scattered showers after midnight.
Sunday..East winds 15 knots. Wind waves 3 to 4 feet. Mixed swell southeast 3 feet and northeast 4 feet. Isolated showers.
Monday..East winds 15 knots. Wind waves 3 to 4 feet. Mixed swell southeast 3 feet and northeast 3 to 4 feet. Isolated showers.
PHZ100 912 Am Hst Thu Jun 20 2019
Synopsis for hawaiian coastal waters.. A ridge will shift south over the area as a trough deepens to the west. The ridge will remain over the area through early next week.


7 Day Forecast for Marine Location Near Halaula, HI
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location: 20.24, -155.77     debug


Area Discussion for -
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Fxhw60 phfo 201941
afdhfo
area forecast discussion
national weather service honolulu hi
941 am hst Thu jun 20 2019

Synopsis
Moderate trade winds will focus showers mainly across windward
areas today. Winds will weaken and shift around to the southeast
Friday through early next week, leading to daytime sea breezes,
spotty interior showers, and more muggy conditions.

Discussion
Troughing to the west of the main hawaiian islands continues to
put a dent in the subtropical ridge to our north, but the pressure
gradient remains steep enough to support 10 to 20 mph trade winds
this morning. Local acceleration boosts wind speeds slightly
within the typically windier channels around maui and the big
island. Satellite loop shows low clouds concentrated across
windward areas, with most leeward areas seeing scattered low
clouds to clear skies. Radar shows very little precipitation, with
isolated showers across windward oahu making up the bulk of noted
activity.

Models show an upper trough northwest of the islands amplifying
and cutting off into a closed upper low over the next couple days.

This will strengthen the surface trough to our west, causing
local winds to shift to southeasterlies and weaken through the
rest of the work week and over the upcoming weekend. Moderate
trade winds will persist through today, then give way to a land
and sea breeze pattern Friday through the weekend.

Expect a fairly dry trade wind pattern today, with clouds and
showers favoring windward and mauka areas. As winds decrease and
shift to the southeast, low level convergence could trigger
additional showers tonight and Friday. Showers will favor
windward and mauka areas tonight and Friday morning, then
mauka and leeward areas during the afternoon hours Friday. A
dry convective pattern should then hold in place Friday night
through the weekend and possibly into the middle of next week. No
heavy rainfall is expected.

Aviation
A 1032 mb surface high resides far northeast of the state, while a
weak trough sits northwest of kauai. This pattern will maintain
moderate easterly trades today. Expect most shower activity to
occur on the windward side of the islands, though an isolated
shower or two may push over onto the interior this afternoon. By
late tonight, flow will become lighter and veer southeasterly.

No airmets are currently in effect.

Marine
A ridge north of the area will maintain locally fresh trade winds
over the coastal waters today. Winds will weaken and shift out of
the southeast starting tonight as a trough deepens west of the
offshore waters. The southeast flow over the coastal waters will
be partly blocked by the big island, resulting in light and
variable winds around the smaller islands starting tomorrow and
continuing through early next week.

Surf will remain well below the advisory threshold along all
shores through at least early next week. Surf along east facing
shores will 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 above the red flag warning threshold
of 600. While we're not expecting to reach other red flag
thresholds today (wind will likely be the limiting factor),
conditions will be dry, resulting in increased fire danger.

Decreasing winds and increasing rh values from Friday onward will
diminish those concerns a bit.

Hfo watches warnings advisories
None.

Discussion... Powell
aviation... Jt
marine... Donaldson


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 14 mi53 min W 8 G 11 81°F 82°F1012.4 hPa
ILOH1 - 1617760 - Hilo, HI 52 mi47 min ENE 6 G 9.9 79°F 79°F1013 hPa
KLIH1 - 1615680 - Kahului Bay, Maui, HI 58 mi53 min NNE 20 G 23 78°F 1013.1 hPa

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Bradshaw Army Air Field / Hawaii, HI34 mi39 minWSW 610.00 miA Few Clouds74°F51°F44%1023.7 hPa

Wind History from HSF (wind in knots)
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Last 24hrW7W6SW7----SW3--------------SE4------W2S4W1W4W6W8W6
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SE10S9SE8S6SE7------SE2W5W5W4S6E10S14
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Tide / Current Tables for Mahukona, Hawaii Island, Hawaii
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Mahukona
Click for Map
Thu -- 01:18 AM HST     0.12 feet Low Tide
Thu -- 05:42 AM HST     0.61 feet High Tide
Thu -- 05:44 AM HST     Sunrise
Thu -- 08:43 AM HST     Moonset
Thu -- 10:37 AM HST     0.08 feet Low Tide
Thu -- 06:09 PM HST     2.11 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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0.20.10.20.30.50.60.60.50.40.20.10.10.20.50.91.31.722.121.81.51.10.7

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (19,4,5,8)
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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.