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 7:08PM||Friday May 24, 2019 2:50 PM HST (00:50 UTC)||Moonrise 12:00AM||Moonset 10:29AM||Illumination 66%|
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 241950|
area forecast discussion
national weather service honolulu hi
950 am hst Fri may 24 2019
Humid easterly trade winds will again give way to afternoon sea
breezes in some leeward areas. Showers will favor windward slopes,
though afternoon clouds and a few showers are expected over
leeward terrain this afternoon. Moderate easterly trade winds and
stable conditions will prevail this weekend and through most of
next week. Showers will mainly be confined to windward slopes.
A somewhat humid, easterly trade wind flow remains in place. The
islands lie under the western periphery of a broad area of surface
high pressure centered far northeast of the state, while a slow
moving and weak front sits roughly 350 miles northwest of kauai.
This places the islands under an east to east-southeast surface
flow that is strongest across the big island and maui. A ridge
aloft is producing stable conditions with an inversion at 5,000 to
7,000 ft. A diffuse band of low level moisture is moving westward
across the island chain. This unimpressive feature dropped more
than 1 2 inch of rainfall on windward big island last night, and
is now draped over molokai and oahu. Expect modest windward
rainfall (1 4 of an inch or less) today due to the band, along
with afternoon clouds and a few showers over leeward terrain. The
band should keep humidity elevated again today as dew points
stubbornly hold in the lower 70s. Sheltered leeward areas will
experience some afternoon sea breezes and high temperatures around
90, leading to another round of uncomfortable conditions.
Easterly trade winds are expected to temporarily strengthen later
this afternoon and overnight. This will occur as the front
northwest of kauai begins to dissipate and surface high pressure
to the northeast exerts greater influence. Expect dew points to
fall several degrees back to seasonal normal. Stable conditions
will continue, keeping modest rainfall focused over windward
Little change is in store through the remainder of the week. After
the initial surge, easterly trade winds will decrease slightly as
the area of high pressure to the northeast weakens and its
associated ridge remains disrupted north of the state. In fact,
the easterly winds could be weak enough to allow periods of
extensive leeward sea breezes on memorial day and Tuesday
afternoons. Models are hinting at stronger trades building in on
Wednesday or Thursday. Overall, conditions will remain stable as a
mid level ridge holds overhead. Showers will favor windward|
slopes, though small pockets of moisture will lead to periodic and
brief increases in shower activity.
Taf sites should remain mostlyVFR through tonight. The band of
showers affecting maui and the big island early this morning is
clearing out, so airmet sierra for mountain obscuration will be
cancelled. Winds are forecast to increase slightly and shift more
out of the east today, so clouds and any showers will likely favor
the typical windward coasts and slopes with less cloud cover over
leeward areas in the afternoon. The kona coast of the big island
will remain wind-sheltered, so afternoon clouds are expected there
once again. A typical trade wind and shower pattern will continue
for the next few days.
An east to east-southeast flow will continue today, with winds
through the typically windier waters around the big island and
maui reaching moderate to fresh speeds. Elsewhere, one more day of
onshore winds is expected. A more easterly direction to the winds
will surge back this evening across the state. This could lead to
a period of small craft advisory (sca) conditions through the
typically windier waters around the big island and maui tonight.
Moderate to fresh east trades are then expected into next week.
A series of south-southwest swells will keep surf up along south
facing shores well into next week. The current south-southwest
swell will produce surf mainly in the head high range through
today. As this swell declines Saturday, forerunners from a larger
south-southwest swell will fill in, and south shore surf is
expected to peak around the 8-foot advisory level Sunday and
The north facing shores will see a bump in surf this weekend as a
moderate, short period northwest swell fills in this evening and
peaks later Saturday into Sunday. This swell will gradually
subside into next week.
Along east facing shores, trade wind swell will pick up as the
trades winds increase this weekend, but will remain below advisory
Hfo watches warnings advisories
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
Click EDIT to select an airport
EDIT Weekend mode (on/off) (on/off)  Help One Week of Data
EDIT (on/off)  Help
Weather Map and Satellite Images(on/off)  HelpWeather Map
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.
Link to Loop
Other links: Northern Pacific Contential US Full GOES-East
Wind Forecast for (20,4,5,8)(on/off)  Help
Ad by Google
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.