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 10:15 AM HST (20:15 UTC)||Moonrise 9:05AM||Moonset 8:43PM||Illumination 10%|
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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 231931|
area forecast discussion
national weather service honolulu hi
931 am hst Sat sep 23 2017
Trade winds will gradually ease during the next few days as a
surface ridge to the north weakens. Mainly windward clouds with
light passing showers will prevail through Tuesday, with a
possible boost in shower activity around the middle of the work
week as the surface trough moves through the islands. Gentle to
moderate trade winds will likely persist heading
A stable trade wind flow is producing a somewhat dry pattern of
mainly windward rainfall. A 1026 mb surface high centered near
42n138w and an associated ridge extending from the high to 600
miles north of kauai are driving the moderate trade wind flow.
Precipitable water within this flow is running near to slightly
below september normal, and a mid level ridge to maintaining
rather stable conditions with an inversion between 6,000 to 7,000
ft. A shallow upper level trough cutting across the islands is
having no impact aside from a wisps of high clouds over the
eastern half of the island chain.
This weather pattern has produced modest rainfall of around a
tenth of an inch over windward slopes in the past 24 hours, with
standouts like waialeale collecting about a third of an inch
during that time. Leeward areas of the smaller islands have been
dry, while leeward an interior slopes of the big island have been
seeing afternoon clouds and a few showers. Expect little change
Only subtle changes to the ongoing weather pattern are in store
during the next few days. The ridge will weaken and retreat slowly
southward, leading to a gradual decrease in the trades. This may
lead to more extensive leeward sea breezes by Monday, but showers
should remain confined to windward slopes.
An increase in shower activity is expected mid-week. A weakening
surface trough, currently sitting about 600 miles east of hilo,|
will dissipate as it passed over the islands on Wednesday, but its
associated moisture will fuel some increase in shower activity.
Gentle to moderate trade winds will persist.
Light to moderate trade winds will persist through 24 hours and
beyond. Ragged clouds and isolated showers embedded in the trade
flow will favor windward and mauka sections of all islands. Weak
sea breezes and convective showers will redevelop across leeward
big island this afternoon and linger through early evening. Brief
MVFR cig vis possible in passing showers. OtherwiseVFR conditions
will prevail all areas.
No airmets currently in effect, and none anticipated at this time.
Trade wind speeds will remain below small craft advisory
threshold through the forecast period.
Surf along south facing shores will remain small through early next
week, with mainly background southeast and southwest swell energy
expected. A 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 for Tuesday through midweek.
A small northwest swell will continue today before easing.
Another small reinforcement from that direction is expected to
fill in around Sunday night, lasting through the middle of next
Hfo watches warnings advisories
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Sat -- 06:10 AM HST 1.33 feet High Tide
Sat -- 06:53 AM HST Sunrise
Sat -- 10:05 AM HST Moonrise
Sat -- 12:38 PM HST 0.37 feet Low Tide
Sat -- 05:58 PM HST 0.92 feet High Tide
Sat -- 06:59 PM HST Sunset
Sat -- 09:43 PM HST Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
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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.