Marine Weather and Tides
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
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.
|Sunrise 6:20AM||Sunset 6:27PM||Saturday September 23, 2017 2:45 AM HST (12:45 UTC)||Moonrise 9:17AM||Moonset 8:25PM||Illumination 8%|
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|Fxhw60 phfo 230626|
area forecast discussion
national weather service honolulu hi
826 pm hst Fri sep 22 2017
Trade winds will gradually trend down over the weekend as a ridge
of high pressure to the north weakens and a weak surface trough
slowly approaches from the east. Mainly windward clouds with
light passing showers will prevail into early next week, with a
possible boost in shower activity around the middle of next week
as the surface trough moves through the islands.
Currently at the surface, a 1027 mb high is centered around 1725
miles north-northeast of honolulu, and is driving moderate trade
winds across the island chain this evening. Meanwhile, a weak
surface trough is located around 550 miles northeast of hilo.
Infrared satellite imagery shows clear to partly cloudy skies in
place across the state, with some thin cirrus also moving over the
big island. Radar imagery shows scattered light showers moving
into windward areas, with a few lingering showers also over
leeward sections of the big island. Elsewhere predominantly rain
free conditions prevail. Main short term concerns revolve around
the diminishing trades and rain chances over the next couple of
Tonight through Tuesday,
high pressure will weaken and shift eastward as the weak surface
trough northeast of the state shifts slowly westward toward the
island chain. This will result in a gradual easing of the trade
winds over the weekend, with light to locally moderate trades
expected for the first half of next week. Showers will continue to
favor windward and mauka areas through the period, although some
leeward shower development will be possible each day due to the
weakened trades. Overall, fairly dry conditions are expected
through the period given precipitable waters values in the 1.0 to
1.3 inch range, well below climatological norms for this time of
Tuesday night through next Thursday,|
the surface trough will shift westward across the island chain
during the middle of next week, and this should bring an increase
in shower activity, as well as increasing the trade wind flow
back to moderate levels. Showers will continue to favor windward
and mauka areas through the period.
Except for the chance of brief MVFR conditions in passing showers
over windward and mauka sections across the island chain, and
tempo lower ceilings over leeward sections of the big island
tonight;VFR will predominate through Saturday.
Airmet tango remains in effect for low level turbulence over and
downwind of the mountains on all islands. This airmet will likely
be cancelled by midnight as the trade winds trend down.
Winds have decreased below small craft advisory (sca) threshold
this evening, and the earlier SCA for waters around maui and the
big island has been cancelled.
Surf along south facing shores will remain small through early next
week, with mainly background southeast and southwest swell energy
expected. The next potential long-period pulse out of the
southwest from the tasman sea is expected by Sunday and could
lead to a slight increase in surf. For the extended forecast,
strong to gale-force southwest winds associated with a low in the
tasman sea may lead to another small southwest swell Tuesday
A small northwest swell will continue into the weekend before
easing. Another small reinforcement from that direction is
expected to fill in around Sunday night through the middle of next
Hfo watches warnings advisories
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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.