Marine Weather and Tides
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.
|Sunrise 6:24AM||Sunset 6:47PM||Thursday March 30, 2017 6:43 AM HST (16:43 UTC)||Moonrise 7:57AM||Moonset 9:45PM||Illumination 11%|
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7 Day Forecast for Marine Location Near Kilauea, HIHourly EDIT Help
Area Discussion for -  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxhw60 phfo 301357 cca|
area forecast discussion... Corrected
national weather service honolulu hi
357 am hst Thu mar 30 2017
Light trade winds over the western end of the state will allow
for leeward afternoon sea breezes over kauai and oahu today, which
will leave to increasing afternoon clouds and brief showers.
Moderate trade winds will continue over the rest of the state with
passing windward showers. Trade winds will become breezy over the
weekend with increasing windward rainfall expected.
No changes to the forecast with the morning package. High pressure
to the northeast of the state continues to bring trade winds to
the eastern end of the state.
The overnight sounding at lihue had a precipitable water (pw)
value of 1.03 while hilo had 1.26 inches, which matches well with
the satellite derive pw. A check upstream shows little change in
the pw value, so not expecting any significant change in shower
Over the western end of the state, the winds are a bit lighter,
which will continue to allow some afternoon sea breezes to set up
over leeward areas, similar to what occurred yesterday. This will
bring some clouds and a few showers to those areas during the
High pressure is expected to build north of the state Friday,
strengthening the trade winds, which will bring a return to a
more typical trade wind weather pattern. Trades are expected to
increase this weekend to breezy to windy levels, with showers
mainly impacting windward and mauka areas.
Heading into the middle of next week, trade winds will weaken as
the high pressure weakens and a cold front passes by to the north
of the islands.
Moderate trade winds will continue for the next few days. No
significant weather features are expected. Clouds and showers will
favor the windward and mountain areas. Localized MVFR cigs/vis|
can be expected for those areas, mainly overnight and early
morning. No airmets are expected at this time.
A large west-northwest swell (290-310 deg) associated with a
strong weather system far northwest of the state should reach the
islands tonight, peak Friday and Friday night, then slowly ease
over the weekend. Warning- and/or advisory-level surf for exposed
north- and west-facing beaches is expected during this time. All
of the models remain in close agreement for seas to ramp up
quickly tonight to small craft advisory levels and peak in the 10-
to 14-ft range Friday, before slowly easing through the weekend.
If the swell comes in larger or later than predicted, warning-
level surf could continue into Saturday before dropping to
advisory levels Sunday.
Local winds and seas will likely remain below advisory levels
through Friday as the ridge of high pressure north of the state
slightly weakens in response to a cold front that is forecast to
approach the region later in the week. Advisory-level trade winds
will return across portions of the waters over the weekend as high
pressure builds north of the state behind this front.
Surf along east-facing shores will remain small and choppy due to
moderate to fresh onshore winds. Surf will begin to build over the
weekend as trade winds strengthen locally and upstream of the
islands, and may near or reach advisory levels along east-facing
shores by the end of the weekend and into early next week.
A slight increase in surf along south-facing shores is possible
today through Saturday due to a long-period swell (190 deg) from
recent activity across the southern pacific. In addition to this
south swell, wrap from the previously discussed large west-
northwest swell will add some to the mix by Friday at select spots
along exposed southern facing beaches.
Discussion... M ballard
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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 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.