Marine Weather and Tides
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.
|Sunrise 5:49AM||Sunset 7:07PM||Wednesday May 22, 2019 8:59 PM HST (06:59 UTC)||Moonrise 11:02PM||Moonset 8:11AM||Illumination 82%|
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 230645|
area forecast discussion
national weather service honolulu hi
845 pm hst Wed may 22 2019
A light to moderate east- southeast wind flow will prevail across
the area through Friday as a high pressure area remains far
northeast of the islands. The winds will become more easterly
on Friday and Saturday, representing the return of the trade
winds. This trade wind flow is mainly moderate in strength that is
expected to linger into next wind week. Expect trade wind showers
to affect the islands during this stretch, favoring mainly the
windward and mountain areas of most islands, especially during
the nights and mornings. There will be some local afternoon
cloudiness over the lee and interior areas of most islands with
isolated showers of as well.
The main hawaiian islands is under the western part of an area of
high pressure with the center located far northeast of the area.
Under this part of the high, the winds are east-southeast, where
there is some degree of blocking by the islands upwind. This will
lead to daytime sea breezes and nighttime land breezes for
especially islands like kauai, oahu, and lanai. This pattern not
only raises the humidity up a little, but also the discomfort
level as well.
The return of the trades is held in check by a stalled front some
450 miles northwest of kauai. This front will be reinforced by
another front, forecast to meet up Thursday night, before pushing
eastward. The reinforced front will then stall and weakens some
240 miles northwest of kauai early Saturday , and remain there
through at least the first half of next week.
As the front stalls and weakens, it will allow the high to
strengthen and the trades, with a more east component, to return
on Friday night and Saturday. When it comes back, the flow will
briefly be locally strong then softens a notch to mainly moderate
speed on Sunday, then hold through at least the first half of next
week. Not only we will have the trade wind showers, but under
this pattern, a tinge of locally daytime sea breezes and nighttime
land breezes will lead to local afternoon cloudiness over lee and
interior areas. But during this stretch through Tuesday, the
support of ridging in the mid and upper levels will maintain a low
level inversion between 6 and 9k feet, which will keep the
afternoon showers to a minimum.
In the near term, we are looking at a band of showers, aligned|
northwest to southeast, set to move through the main hawaiian
islands. The leading edge is about to move ashore of windward big
island. Mainly fair weather, except for a few spotty windward and
mauka showers, will hold for the smaller islands to until near
midnight for maui, oahu around daybreak Friday, then kauai about
mid morning Thursday, that is if the band is still in one piece.
Another shower band, oriented north to south, may impact the
islands Thursday night and Friday. Clearing the islands by Friday
A light flow pattern continues across the islands this evening.
Patchy broken low clouds over central kauai should break up as
night time cooling sets in. A band of broken low clouds just
upwind from the big island and the islands of maui county may
spread MVFR ceilings across eastern shores and slopes there later
tonight. However, no airmets are in effect at this time. Tafs are
A surface ridge will persist and strengthen north of the state, while
a stalled front lingers northwest of the offshore waters. This will
produce easterly trade winds to small craft advisory speeds around
the big island tonight, with moderate to breezy southeast winds
over maui county windward waters. Remaining waters are mostly
blocked from the southeast flow, so winds will be lighter and more
variable there. The front and ridge will slowly shift northwest
through the rest of the week, causing winds to back out of the
east over the smaller islands by Friday, with easterly trades
persisting through next week.
Small to moderate surf will continue along south facing shores through
Friday. A fairly large, long-period swell is forecast to reach the
coastal waters Saturday, and may produce surf near advisory level
along south facing shores through memorial day. A smaller, reinforcing
south swell is possible Tuesday. Surf along north facing shores will
be quite small through Thursday, then small to moderate swells are
expected to arrive into the middle of next week. Lastly, as winds
strengthen northeast of the area over the next day or two, surf will
see a bump along east facing shores.
Hfo watches warnings advisories
Small craft advisory until 6 am hst Thursday for alenuihaha
channel, big island windward waters, and waters south of the
H lau powell kinel
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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.