Sunday, August25, 2019 L-36.com


Marine Weather and Tides
Laupahoehoe, 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 6:02AMSunset 6:42PM Sunday August 25, 2019 12:11 PM HST (22:11 UTC) Moonrise 1:06AMMoonset 2:45PM Illumination 22% Phase: Waning Crescent; Moon at 25 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- 947 Am Hst Sun Aug 25 2019
Rest of today..East winds 20 knots. Wind waves 6 feet. SWell northeast 3 feet. Scattered showers late in the morning, then isolated showers in the afternoon.
Tonight..East winds 20 knots. Wind waves 6 feet. SWell north 3 feet. Scattered showers.
Monday..East winds 15 knots. Wind waves 5 feet. SWell north 3 feet. Scattered showers through the day.
Monday night..East winds 15 knots. Wind waves 5 feet. SWell north 3 feet. Isolated showers in the evening, then scattered showers after midnight.
Tuesday..East winds 15 knots. Wind waves 4 feet. Isolated showers in the morning.
Tuesday night..East winds 15 knots. Wind waves 3 feet. Isolated showers.
Wednesday..East winds 10 knots. Wind waves 3 feet. Southwest swell 3 feet. Isolated showers.
Thursday..East winds 15 knots. Wind waves 3 feet. Southwest swell 3 feet. Isolated showers.
PHZ100 947 Am Hst Sun Aug 25 2019
Synopsis for hawaiian coastal waters.. High pressure far north of the state will drive fresh to strong trade winds into Monday, strongest today. Trades will gradually decrease through Wednesday as the high weakens and moves away from the islands.


7 Day Forecast for Marine Location Near Laupahoehoe, HI
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location: 20.8, -154.34     debug


Area Discussion for -
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Fxhw60 phfo 251947
afdhfo
area forecast discussion
national weather service honolulu hi
947 am hst Sun aug 25 2019

Synopsis
A trade wind weather pattern will continue through Monday, thanks
to high pressure far north of the area. Trade winds will become
lighter Tuesday through Friday as an area of low pressure develops
far north of the area. Local land and sea breezes are expected to
develop across some areas under this lighter trade wind regime. A
new high is expected to build in far north northwest of the area
next weekend with an uptick in trade winds expected. Clouds and
passing showers will tend to favor windward and mauka areas with
afternoon clouds and showers possible over the leeward big island
slopes through the forecast period.

Discussion
Surface high pressure is centered far north of the state. This
places the islands in a moderate to locally breezy trade wind
environment. Aloft, there is a mid level ridge in place over the
area. This is providing for a rather stable airmass to be in place
across the state. Thus any showers that do form will tend to be
on the lighter side due to inhibited cloud growth. The surface
high will continue to keep moderate to breezy trade winds in place
through Monday while the upper ridge will keep inversion heights
low with only light windward and mauka showers expected. Afternoon
and evening clouds and showers are also expected over the leeward
big island slopes.

During the Tuesday through Friday time frame, the high is
forecast to weaken and move off to the northeast while an area of
low pressure develops far to our north. This will cause our trade
winds to weaken to the light to locally moderate range. Localized
land and sea breezes may develop under this lighter trade wind
regime. Meanwhile, the state is forecast to lie between a mid
level ridge northwest of the state and a mid level trough just
east of the state. Thus instability will be limited under this
scenario. Shower activity will be highly dependent on incoming
moisture availability and primarily focused over windward and
mauka area. Daytime heating may allow for some afternoon shower
development over interior areas as well as over the leeward big
island slopes.

As we head into next weekend, a new high is forecast to begin
building in far to our north northwest while the area of low
pressure moves off to the northeast. This should allow for an
uptick in trade wind speeds across the area. Clouds and passing
showers will tend to favor windward and mauka areas under this
weather regime.

Aviation
High pressure north northeast of hawaii will continue to bring
breezy trade winds to the state. So not much change from Saturday's
weather except winds will tend to be a little stronger and there
should be a few more showers in windward mauka areas this
afternoon and through tonight for maui county and the big island.

Will issue an airmet accordingly if necessary. The winds may also
be strong enough on these islands to blow a few showers into
leeward sections. Airmet tango continues for mechanical turbulence
downwind of all the mountains below 8,000 feet. This airmet will
likely continue through today and into tonight with little change
in winds expected except the winds may be a little weaker Monday.

Vfr conditions are expected to prevail most of today with passing
MVFR conditions in passing clouds and showers primarily over the
windward slopes. There may be a more steady MVFR conditions for
maui county and the big island late today and overnight tonight as
more moisture works into the windward areas of these islands.

Marine
Fresh to strong easterly trade winds will continue today as high
pressure remains far north of the state. The small craft advisory
(sca) has been expanded from the typically windy waters around the
big island and maui to briefly cover the maui county windward and
kaiwi channel waters today. Trades will gradually decrease through
the first half of the week as the high weakens and drifts northeast.

Advisory level winds will likely scale back to the usual windy areas
Monday afternoon, and then drop completely by Tuesday.

South shore surf will remain around the summer background level for
the next few days as a southwest swell out of the tasman sea arrives
Tuesday, peaks Wednesday and Thursday, then declines into next weekend.

Though hawaii is largely blocked by swells from this direction,some
slightly higher, but inconsistent, sets are possible during the peak.

Expect a slight and brief increase in east shore surf today as trades
strengthen, followed by a gradual decline through the rest of the
week. North shore surf will remain small through the week.

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

Small craft advisory until 6 pm hst this evening for kaiwi
channel-maui county windward waters.

Discussion... Burke
aviation... Chevalier
marine... Ts


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 83 mi53 min ENE 8 G 14 81°F 82°F1015.8 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, HI84 mi18 minNE 1010.00 miOvercast85°F70°F61%1015.8 hPa

Link to 5 minute data for PHTO

Wind History from HTO (wind in knots)
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Last 24hrE9CalmE10E10E7E9CalmW5W5W5W5SW4SW5CalmE12E11SW6W7SW5W4W8CalmCalmNE10
1 day ago6E11E11
G17
E8E9E6E5SE3SW3CalmCalmCalmSW3W6SW5SW5SW5SW5S3S3CalmCalmN74
2 days agoNE8NE9NE7N8NE7N6N7N5W4CalmW4SW5SW5SW5W6SW6SW4SW6SW6SW5SE6SE10SE6E9

Tide / Current Tables for Hilo, Hawaii Island, Hawaii
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Hilo
Click for Map
Sun -- 01:10 AM HST     Moonrise
Sun -- 04:02 AM HST     0.36 feet Low Tide
Sun -- 06:03 AM HST     Sunrise
Sun -- 11:44 AM HST     2.62 feet High Tide
Sun -- 02:46 PM HST     Moonset
Sun -- 06:41 PM HST     Sunset
Sun -- 07:11 PM HST     0.63 feet Low Tide
Sun -- 11:26 PM HST     1.37 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.20.90.70.50.40.40.711.51.92.32.62.62.52.21.81.310.70.60.70.91.21.3

Tide / Current Tables for Hilo, Hilo Bay, Hawaii
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Hilo
Click for Map
Sun -- 01:10 AM HST     Moonrise
Sun -- 04:24 AM HST     0.22 feet Low Tide
Sun -- 06:03 AM HST     Sunrise
Sun -- 12:10 PM HST     2.47 feet High Tide
Sun -- 02:46 PM HST     Moonset
Sun -- 06:41 PM HST     Sunset
Sun -- 07:03 PM HST     0.97 feet Low Tide
Sun -- 11:10 PM HST     1.32 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.10.80.60.40.20.20.40.81.21.622.32.52.42.21.91.51.21111.11.31.3

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.
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Wind Forecast for (18,4,5,8)
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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.