Marine Weather and Tides
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.
|Sunrise 6:36AM||Sunset 6:43PM||Saturday March 17, 2018 4:05 AM HST (14:05 UTC)||Moonrise 6:34AM||Moonset 6:47PM||Illumination 0%|
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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 171358|
area forecast discussion
national weather service honolulu hi
358 am hst Sat mar 17 2018
Expect a brief reprieve in the humidity as the trade winds make
a return over the next couple of days. A band of showers will
bring an uptick in trade showers tonight through Sunday. A front
stalling west of kauai by the middle of next week will bring back
the southeast winds, which in turn, will raise the humidity level,
and the possibility of some wet weather for the second half of the
It has been a rather quiet night with fair skies and light winds
reigning the area. A patch of low clouds embedded in the trade
wind flow will be making landfall shortly there at the puna
district of the big island. Expect a few light showers with these
clouds this morning. This same trade winds over the eastern end
of the island chain will be spreading westward to the smaller
islands throughout today. The trade will be light enough this
morning to allow for the development of a sea breeze along the
wind sheltered leeward shoreline and interior areas of the
smaller islands. This will lead to some spotty afternoon clouds
and isolated showers over these locations. Light to moderate
trades will be filling in before sunset, chasing away these clouds
The islands could be facing a showery Sunday as a band of showers
make its way down the island chain from the north later tonight.
First to be affected is kauai, mostly after midnight. Oahu is
next, arriving around sunrise Sunday. The band will then work its
way down to maui county Sunday afternoon and evening, and lastly,
reaching the big island late Sunday night into Monday. Moderate
trade winds fills in behind the band, along with some scattered
showers, which will continue into Monday.
A front stalling just west of kauai will cause a shift in the
winds to the southeast over kauai county on Tuesday, while
moderate trades prevail elsewhere. The humidity level will rise
with this slight change in wind direction. Vog was mentioned to
return as well, but there could be a chance that it will not since
the wind has more of an east component. We will take another look
at the winds again before making any alterations.
The GFS contend the wet weather starts with kauai as early as
Tuesday night and gets progressively wetter into Thursday along
with showers spreading to the remaining smaller islands in
association with a band of showers. The new ECMWF run agrees with
the gfs, but does not show the band moving down on the remaining|
smaller islands, and thus the remaining islands are dry. There are
other subtle differences between these two models, such as one
model shows a shortwave trough, and the other doesn't. The front
is a very slow mover toward the east. This means the inclement
weather will likely spread to the other islands and extending it
into next weekend. There is a degree of uncertainty as of now, but
the similarity the two models early on do tell us that kauai is
once again targeted for some heavy weather around the middle of
PredominantVFR conditions into the morning hours with isolated
MVFR conditions. Land breezes are expected in most locations into
the morning hours. Trade winds will gradually work back into
place throughout the day. When that happens we will expect to see
the return of isolated MVFR conditions along the windward slopes
as clouds build and some lead to showers.
No airmets are currently in effect.
No marine warnings are expected for the next day or two. After
trade winds return by this afternoon and evening, a moderate wind
regime is expected to persist into Tuesday. Small craft advisory-
level winds may return through the channels around the big island
and maui county Sunday and Monday. Winds will begin to shift
towards the southeast once again late Tuesday through the second
half of the upcoming week as a front approaches from the west and
stalls, likely bringing another wet period with heavy showers back
across the coastal waters.
A series of small northwest swells has begun filling in across the
area. Surf will remain well below advisory levels with these swells
over the next several days.
A broad low is forecast to develop and move into the northeast
pacific late this weekend and direct a large swath of gale force
winds towards the islands. This should translate to a building
north-northeast swell late Tuesday. This could bring advisory
level surf to north and east facing shores.
Small long period south swells should provide above null surf for
the south facing shores over the next few days.
Hfo watches warnings advisories
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Sat -- 03:14 AM HST New Moon
Sat -- 04:09 AM HST 1.26 feet High Tide
Sat -- 07:11 AM HST Sunrise
Sat -- 07:33 AM HST Moonrise
Sat -- 10:39 AM HST -0.09 feet Low Tide
Sat -- 04:32 PM HST 0.98 feet High Tide
Sat -- 07:14 PM HST Sunset
Sat -- 07:47 PM HST Moonset
Sat -- 10:30 PM HST -0.03 feet Low Tide
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.