Marine Weather and Tides
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 6:11AM||Sunset 6:57PM||Friday August 23, 2019 12:24 PM HST (22:24 UTC)||Moonrise 12:00AM||Moonset 12:43PM||Illumination 41%|
7 Day Forecast for Marine Location Near Kekaha, HIHourly EDIT Help
Area Discussion for -  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxhw60 phfo 231952|
area forecast discussion
national weather service honolulu hi
952 am hst Fri aug 23 2019
Moderate to breezy trades will continue through the weekend,
periodically delivering clouds and showers to windward areas while
most leeward areas remain mostly dry. Trade wind speeds may diminish
by the middle of next week.
As a weak surface trough N of the islands weakens and drifts NW over
the next couple of days, surface high pressure will strengthen far n
of the area, and trade wind speeds will increase slightly. The
locally breezy trade winds will continue through early next week,
but are then expected to weaken by mid-week as the high weakens and
a low passes far N of the area. With no major sources of moisture or
instability expected through the weekend, trade winds will
periodically deliver clouds and showers that will primarily dampen
windward areas, while most leeward areas remain dry. More
significant moisture areas may become embedded in the trade flow in
about a week, but confidence in that is close to zero.
Latest satellite images show an area of broken to overcast stable
and showery low clouds immediately upstream of the islands, but
skies over most island areas are mostly sunny to partly cloudy, with
radar detecting only isolated showers. Model guidance indicates that
this moisture patch will move over kauai and oahu later today into
tonight, fueling a few windward showers before moving W of the area
by morning. Another slug of moisture passing S of the big island may
fuel some windward showers Saturday night, but nothing significant
in the way of accumulation or coverage is expected.
High pressure remains north of hawaii with nothing to disrupt the
easterly trade winds which will continue most likely through the|
weekend.VFR conditions will dominate most areas across the state
with maybe a few passing, infrequent MVFR conditions on the windward
side of the mountains with clouds and maybe a shower and lower
It will be breezy again this afternoon so there is a chance for some
pockets of low level turbulence south and west of the mountains.
Other than that, no airmets are expected through this forecast
High pressure to the north will maintain moderate to locally strong
trades through the weekend. A small craft advisory (sca) is posted
through Sunday for the typically windy waters around maui and the
big island. Another front is forecast to pass north of the state
next week with east trade winds weakening.
The current south swell will continue to subside today with mainly
background energy expected over the weekend into early next week. A
larger southwest swell is expected to arrive Tuesday and will likely
peak Wednesday or Thursday near advisory levels.
Small northwest swells will linger over the next few days providing
some out of season surf along north facing shores. Breezy trades
will continue to produce small choppy surf along east facing shores
over the next few days.
Hfo watches warnings advisories
Small craft advisory until 6 pm hst Sunday for maalaea bay-
pailolo channel-alenuihaha channel-big island leeward waters-big
island southeast waters.
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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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Wind Forecast for (18,4,5,8)(on/off)  Help
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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.