Monday, August20, 2018

Marine Weather and Tides
Kilauea, HI

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Sunrise 6:10AMSunset 6:59PM Sunday August 19, 2018 11:09 PM HST (09:09 UTC) Moonrise 2:12PMMoonset 12:00AM Illumination 65% Phase: Waxing Gibbous; Moon at 9 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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7 Day Forecast for Marine Location Near Kilauea, HI
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location: 36.66, -151.22     debug

Area Discussion for -
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Fxhw60 phfo 200654
area forecast discussion
national weather service honolulu hi
830 pm hst Sun aug 19 2018

A weak trough of low pressure just west of kauai will continue to
advance west, away from the islands, with a drier airmass and
strengthening trade winds returning to the state Monday and Tuesday.

For the remainder of the week, the forecast will be highly dependent
on the track and intensity of hurricane lane. An increase in trade
winds and showers will be the likely result based on the latest
forecast for lane.

Still some lingering instability over the western end of the state
this evening results in active weather for kauai and vicinity as
well as western oahu coastal waters, with isolated thunderstorms
and locally heavy showers. The feature that is responsible for the
weather is a trough that is currently just west of kauai. This
feature will continue to track west, exiting the state. Hence,
weather conditions for the western end will slowly improve overnight
into early Monday as a somewhat drier but definitely more stable
airmass spreads from the east over the area. Surface high pressure
far northeast of the state providing the trade winds is moving
south-southwest. Meanwhile another high pressure far northwest of
the state is advancing east as well. This leads to a tightening of
pressure gradient across the area, resulting in an increase in trade
winds for the state as well.

The aforementioned two highs will gradually merge and take up a
position far to our north in the next couple of days. This will lead
to a further strengthening in trade wind speeds across state. A
somewhat drier and more stable airmass is also anticipated in the
island vicinity. Therefore, expect breezy trade wind weather for the
islands in the next couple of days, with passing low clouds and
showers affecting mainly windward and mountain areas. Lee areas of
the smaller islands may also see some clouds and showers as winds
may be strong enough to carry them over.

As for Wednesday through the weekend time frame, our weather will be
highly dependent on the track and intensity of hurricane lane. It is
still too early to determine the weather impacts from lane will have
on the state. The last forecast track from the central pacific
hurricane center still has lane passing south of the main hawaiian
islands. If this track holds, the main impacts on the islands
weather would be for an increase in trade wind speeds due to a
tightened pressure gradient between high pressure north of the state
and lane to our south. Also moisture around the periphery of lane
would likely bring an increase in shower activity over the big
island Wednesday, mainly east and southeast and then eventually
spreading up the island chain through the remainder of the week.

Everyone is encouraged to monitor the latest advisories on hurricane
lane from the central pacific hurricane center.

A low level trough near kauai continues to drift westward with
enough elevated moisture and instability for continued showers and a
few thunderstorms over the kauai region through around 10z. Stronger
trade winds will bring drier and more stable air filtering in from
the east on Monday morning with improving weather trends across the
aloha state.

Airmet sierra is in effect for mtn obsc on kauai and lanai. These
airmets will likely drop early Monday morning.

As winds strengthen and the atmosphere becomes more stable,
turbulence in the lee of the mountains may become moderate and
airmet tango may be needed.

A weak surface trough just W of kauai will move W away from the area
as high pressure builds to the n. This will result in a gradually
increasing trade wind flow through Tuesday. A small craft advisory
(sca) has been posted for the windier areas around maui and the big
island in anticipation of the increasing trade wind flow. As
hurricane lane moves into an area S of the islands later in the
week, the pressure gradient will likely increase after the middle of
the week, likely leading to an expansion of the sca. However, there
is significant uncertainty regarding the position and intensity of
lane later in the week. It is too early to determine what impacts
lane may eventually bring, and mariners need to continue to monitor
subsequent forecasts.

Long period swells from hurricane lane are expected to begin
arriving along E and SE facing shores of the big island and maui on
Monday, and a high surf advisory is posted for E facing shores of
those islands beginning Monday morning. As hurricane lane moves
closer to the islands around midweek and potentially lingers S of
the islands through the end of the week, swell is expected to
increase. Difficult to know what level of impacts this may have, but
there is potential for large seas swells from lane to lead to
warning-level surf along E through S facing shores of all islands. A
small nnw swell is expected to arrive Monday and peak on Tuesday
before gradually diminishing Wednesday and Thursday.

See the latest oahu surf discussion (srdhfo) for more details on
surf and swell.

Hfo watches warnings advisories
High surf advisory from 6 am Monday to 6 pm hst Tuesday for
windward haleakala-south big island-big island north and east.

Small craft advisory until 6 pm hst Tuesday for maalaea bay-
pailolo channel-alenuihaha channel-big island leeward waters-big
island southeast waters.

Synopsis discussion... Hui
aviation... Bohlin
marine... Birchard

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Tide / Current Tables for
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Weather Map and Satellite Images
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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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (5,6,7,8)
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Ground Weather Radar Station Kauai, HI
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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 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 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.