Saturday, August17, 2019 L-36.com


Marine Weather and Tides
Halaula, HI

Version 3.4
NOTICE
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
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 6:00AMSunset 6:48PM Saturday August 17, 2019 6:50 AM HST (16:50 UTC) Moonrise 8:37PMMoonset 7:52AM Illumination 96% 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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PHZ121 Alenuihaha Channel- 335 Am Hst Sat Aug 17 2019
Today..East winds 20 knots. Wind waves 6 feet. Isolated showers through the day.
Tonight..East winds 20 knots. Wind waves 6 feet. Isolated showers.
Sunday..East winds 20 knots. Wind waves 5 feet. Isolated showers.
Sunday night..East winds 15 knots. Wind waves 4 feet. Isolated showers.
Monday..East winds 15 knots. Wind waves 4 feet. Isolated showers.
Monday night..East winds 15 knots. Wind waves 4 feet. South swell 3 feet. Isolated showers.
Tuesday..East winds 15 knots. Wind waves 3 to 4 feet. South swell 4 feet. Isolated showers.
Wednesday..East winds 20 knots. Wind waves 5 to 7 feet. South swell 4 feet. Isolated showers.
PHZ100 335 Am Hst Sat Aug 17 2019
Synopsis for hawaiian coastal waters.. A surface high pressure system far northeast of the islands will weaken from this weekend into early next week. A new surface high is forecast to build far north of the state by the middle of 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 171415
afdhfo
area forecast discussion
national weather service honolulu hi
415 am hst Sat aug 17 2019

Synopsis
A surface ridge north of the islands will maintain moderate trade
winds through today. Winds will decrease Sunday and Monday, with
an uptick expected for the middle of next week. Increased shower
activity and muggy conditions are expected starting late Tuesday
through Thursday.

Discussion
There is little or no change in forecast philosophy since last
evening. A 1029 mb high near 38n143w, far northeast of the main
hawaiian islands, along with an associated ridge extending through
30n150w and 26n170w, continues to drive moderate trade winds
across the area this morning. High clouds along the southern
flank of an upper trough cover skies above the big island, while
low clouds brought in by the trades continue to concentrate along
windward and mauka sections of all the islands. Radar shows
scattered to numerous moderate showers embedded within trade flow
also favoring windward and mauka areas. Models show the upper
trough will move east over the next day or so, likely causing the
high clouds to shift east of the state by Sunday.

The high will shift eastward over the next few days, causing the
ridge to our north to elongate and weaken. As a result, trade
winds will decrease today through early next week. By late
Wednesday, another high will build in from the northwest, allowing
trade winds to increase from midweek into next weekend.

Models show a weak trough will move past the islands around
midweek, likely bumping up available moisture for showers. Details
concerning how much moisture will be available and how far up the
island chain the additional showers will develop remain to be
worked out. No strong upper trough is expected during this time,
so at this point we are only forecasting an increase in trade
shower coverage from midweek onward.

Aviation
High pressure northeast of the state will keep moderate to
locally breezy trade winds in place through tonight. Low clouds
and showers will favor windward and mauka areas, bringing
occasional MVFR CIGS vsbys. Showers will be most prevalent during
the pre-dawn and early morning hours, with improving conditions
expected by mid-morning.

Airmet sierra is in effect for mountain obscuration across
windward sections of oahu, molokai, maui and the big island.

These conditions are expected to improve by mid-morning.

Marine
A surface high pressure system far northeast of the state will
gradually weaken this weekend, which will cause the trade winds
to diminish slightly through early next week. Therefore, the
small craft advisory (sca), which was in effect over the
typically windier waters adjacent to the islands of maui county
and the big island, has been cancelled this morning. A new
surface high pressure system building far north of the state by
the middle of next week is expected to cause the trade winds to
gradually strengthen starting next Wednesday.

Small south and southwest swells will maintain background
summertime surf along south facing shores this weekend. A large,
long-period south-southwest swell arriving Monday is expected to
peak Tuesday, then gradually lower through the rest of next week.

Surf heights are expected to reach the high surf advisory (hsa)
criteria along south facing shores from Monday night through
Tuesday.

The current west swell produced by tropical cyclones in the
northwest pacific will continue to slowly decline through Monday.

Surf heights produced by this lingering swell will be largest
along shorelines with a westerly exposure. A small northwest swell
will be possible from next Thursday through Friday. Modest surf
will persist along east facing shores today, then will slowly
subside from Sunday through early next week as the trade winds
weaken.

For additional details on swells and surf, please see the latest
collaborative nearshore swell and wind forecast for oahu (srdhfo)
product.

Hfo watches warnings advisories
None.

Discussion... Powell
aviation... Jelsema
marine... Houston


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 14 mi57 min NE 4.1 G 5.1 78°F 83°F1015.9 hPa
ILOH1 - 1617760 - Hilo, HI 52 mi51 min SSW 1.9 G 2.9 75°F 82°F1016.9 hPa (-0.3)
KLIH1 - 1615680 - Kahului Bay, Maui, HI 58 mi57 min NE 8.9 G 12 78°F 1017.2 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 mi1.9 hrsSSE 610.00 miFair58°F47°F67%1015.6 hPa

Link to 5 minute data for PHSF

Wind History from HSF (wind in knots)
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1 day agoCalmS13
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SW6W10SW6W8W5W3CalmSE4SE4S4SE4SE3SE5SE4SE7SE7SE9
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S9S10--SE7--

Tide / Current Tables for Mahukona, Hawaii Island, Hawaii
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Mahukona
Click for Map
Sat -- 04:43 AM HST     1.26 feet High Tide
Sat -- 06:04 AM HST     Sunrise
Sat -- 07:53 AM HST     Moonset
Sat -- 10:21 AM HST     0.30 feet Low Tide
Sat -- 05:00 PM HST     2.08 feet High Tide
Sat -- 06:51 PM HST     Sunset
Sat -- 08:37 PM HST     Moonrise
Sat -- 11:56 PM HST     0.34 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.50.811.21.31.20.90.70.40.30.30.50.91.31.722.121.71.410.60.4

Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Kawaihae
Click for Map
Sat -- 05:12 AM HST     1.26 feet High Tide
Sat -- 06:03 AM HST     Sunrise
Sat -- 07:53 AM HST     Moonset
Sat -- 10:45 AM HST     0.14 feet Low Tide
Sat -- 05:28 PM HST     2.15 feet High Tide
Sat -- 06:50 PM HST     Sunset
Sat -- 08:37 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.30.60.91.11.31.210.70.40.20.10.30.61.11.51.92.12.11.91.510.60.3

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 (12,3,4,5)
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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.