Friday, September21, 2018 L-36.com


Marine Weather and Tides
Heeia, HI

Version 3.4
What's New / NOTES
9/17/2018 XTide broke when 1and1 "upgraded" my server. It has been esculated. I am sorry for the problem.

Sunrise 6:18AMSunset 6:28PM Friday September 21, 2018 2:18 AM HST (12:18 UTC) Moonrise 4:44PMMoonset 3:28AM Illumination 88% Phase: Waxing Gibbous; Moon at 11 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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PHZ116 Kaiwi Channel- 931 Pm Hst Thu Sep 20 2018
Rest of tonight..East winds 20 knots. Wind waves 6 feet. Scattered showers.
Friday..East winds 20 knots. Wind waves 6 feet. Isolated showers.
Friday night..East winds 20 knots. Wind waves 6 feet. Isolated showers.
Saturday..East winds 20 knots. Wind waves 5 feet. Isolated showers in the morning.
Saturday night..East winds 15 knots. Wind waves 5 feet. Isolated showers after midnight.
Sunday..East winds 15 knots. Wind waves 5 feet. Isolated showers in the morning.
Sunday night..East winds 15 knots. Wind waves 5 feet. Isolated showers.
Monday..Southeast winds 10 knots. Wind waves 4 to 5 feet.
Tuesday..Southeast winds 10 knots in the morning becoming variable less than 10 knots. Wind waves 3 to 4 feet.
PHZ100 931 Pm Hst Thu Sep 20 2018
Synopsis for hawaiian coastal waters.. High pressure northeast of the state will keep a moderate to locally strong trade wind flow in place through Saturday. An area of low pressure is expected to develop several hundred miles northwest of kauai over the weekend, and this should allow the winds to weaken and shift around to the southeast Sunday through early next week.


7 Day Forecast for Marine Location Near Heeia, HI
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location: 21.44, -157.81     debug


Area Discussion for -
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Fxhw60 phfo 210656
afdhfo
area forecast discussion
national weather service honolulu hi
856 pm hst Thu sep 20 2018

Synopsis
A drying trend with moderate to breezy trades returning is expected
Friday into the weekend as a weak trough of low pressure near the
western end of the state continues westward. Clouds and showers will
favor the typical windward and mauka locations through Saturday
night. A return of warm and muggy conditions are forecast to return
later in the weekend through early next week as low pressure forms
to the west of the state. Light to moderate southerly winds and
plenty of tropical moisture lifting northward will translate to
increasing rain chances Sunday night through Wednesday.

Discussion
Short-term (through Saturday) guidance remains in good agreement and
supports a return of drier conditions with moderate to breezy trades
filling from east to west in across the state. Dewpoints are
forecast to steadily lower from the mid 70s to the upper 60s come
Saturday. Clouds and showers will shift back over the typical
windward and mauka locations. The exception could be over kauai
where residual moisture (precipitable water (pws) remaining above
normal) may linger as a weak surface trough passes to the north late
tonight through Friday.

More of a wet pattern returning will be possible late Sunday through
the first half of the upcoming week, especially for the western end
of the state. The extended guidance remains in decent agreement and
depicts low pressure developing west-northwest of the state in
response to an upper trough digging southward across the central
pacific. Light to moderate southerly flow along with deep tropical
moisture pooling northward over the region will translate to warm
and muggy conditions with increasing rain chances. Dewpoints are
forecast to surge back toward the mid 70s with pws climbing well
above normal for this time of year. The GFS solution depicts pws
reaching as high as 2.4" Sunday night through Monday night. If this
scenario evolves, the potential for heavy rainfall can't be ruled
out if and where showers setup and become focused over any
particular area. Although forecast uncertainty remains elevated this
far out in the forecast, it appears the best synoptic scale lift and
deep moisture will align across the western end of the state.

Additionally, a few thunderstorms can't be ruled out early next week
as upper heights fall, despite the better instability expected to
remain off to the northwest of the state.

Aviation
As a weak surface trough departs the western end of the island
chain, the low-level trade wind flow is gradually strengthening
near the big island and maui. The returning trades will transport
low clouds and showers over some windward facing sections of the
state through early Friday morning. This may result in brief
periods of MVFR vis cig over windward sections. Otherwise,VFR
conditions are expected to prevail through Friday morning.

The trade wind flow is expected to bring drier conditions during
the day on Friday. This will maintainVFR conditions over most
areas of the state Friday afternoon, but there is a possibility
of isolated MVFR over some windward facing slopes and terrain.

No airmets are in effect, and none are expected through early
Friday morning.

Marine
High pressure northeast of the state will keep a moderate to
locally strong trade wind flow in place through Saturday. As a
result, a small craft advisory (sca) remains in place for the
alenuihaha and pailolo channels as well as the waters south of the
big island through Saturday. The SCA is expected to expand to
include maalaea bay on Friday. An area of low pressure is expected
to develop several hundred miles northwest of kauai over the
weekend, and this should allow the winds to weaken below sca
levels and shift around to the southeast Sunday through early next
week.

Surf will remain below advisory levels along all shores through
the middle of next week. The current south swell will continue to
slowly decline through Friday. As trade winds strengthen tonight,
rough, short-period surf will briefly rise to around the summer
average along east facing shores through Friday night, then
decline during the weekend. Elsewhere, no significant swells are
expected.

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

Small craft advisory from 6 am Friday to 6 pm hst Saturday for
maalaea bay.

Discussion... Gibbs
aviation... Houston
marine... Jelsema


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MOKH1 - 1612480 - Mokuoloe, HI 1 mi43 min ESE 8.9 G 12 80°F 83°F1013.8 hPa
51210 4 mi19 min 81°F5 ft
51207 4 mi25 min 80°F5 ft
51202 - Mokapu Point, HI (098) 7 mi19 min 81°F6 ft
OOUH1 - 1612340 - Honolulu, HI 10 mi37 min ENE 1.9 G 2.9 80°F 81°F1013.1 hPa
51211 13 mi49 min 81°F3 ft
51212 20 mi19 min 82°F3 ft

Wind History for Mokuoloe, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kaneohe, Marine Corps Air Station, HI2 mi82 minE 610.00 miOvercast80°F75°F87%1012.8 hPa
Daniel K Inouye International Airport, HI9 mi26 minNE 810.00 miA Few Clouds80°F71°F74%1013 hPa
Oahu, Kalaeloa Airport, HI16 mi26 minNE 310.00 miFair75°F70°F84%1014.1 hPa

Wind History from HNG (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmN3NE6NE6NE6NE8NE8NE7NE83E6654E5E5E64
1 day agoCalmCalmCalmCalmCalmCalmCalmN3NE5------------------------CalmCalmCalm
2 days agoE7
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NE11NE9NE7NE8E8E8NE6NE3E5E4E3E3CalmCalmCalmCalm

Tide / Current Tables for Honolulu, Honolulu Harbor, Oahu Island, Hawaii
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Hanauma Bay, Oahu Island, Hawaii
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


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 (8,2,3,4)
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Ground Weather Radar Station Molokai, 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.