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 6:56AM||Sunset 6:03PM||Monday January 15, 2018 11:34 PM HST (09:34 UTC)||Moonrise 5:52AM||Moonset 5:09PM||Illumination 0%|
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|PHZ122 Big Island Windward Waters- 907 Pm Hst Mon Jan 15 2018 |
.small craft advisory in effect through early Tuesday morning...
Rest of tonight..East winds 15 knots. Wind waves 4 feet. Northwest swell 10 feet. Slight chance of showers.
Tuesday..Northeast winds 20 knots. Wind waves 5 feet. Northwest swell 9 feet. Slight chance of showers.
Tuesday night..Northeast winds 15 knots. Wind waves 5 feet. Northwest swell 7 feet. Isolated showers in the evening, then scattered showers after midnight.
Wednesday..Northeast winds 20 knots. Wind waves 7 feet. Northwest swell 9 feet. Scattered showers.
Wednesday night..East winds to 25 knots. Wind waves 8 feet. Northwest swell 9 feet. Scattered showers.
Thursday..East winds to 25 knots. Wind waves 9 feet. Northwest swell 8 feet. Scattered showers.
Thursday night..East winds to 30 knots. Wind waves 11 feet. North swell 8 feet. Scattered showers.
Friday..East winds to 25 knots. Wind waves 9 to 10 feet. North swell 5 to 7 feet. Scattered showers.
Saturday..East winds 20 knots. Wind waves 7 to 8 feet. North swell 4 to 5 feet. Scattered showers.
|PHZ100 907 Pm Hst Mon Jan 15 2018 |
Synopsis for hawaiian coastal waters.. A surface ridge northeast of the area will build gradually through Tuesday. A strong new high will move east to a position north of the islands Wednesday night. The high will move away to the northeast during the second half of the week.
7 Day Forecast for Marine Location Near Laupahoehoe, HIHourly EDIT Help
Area Discussion for -  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxhw60 phfo 160635|
area forecast discussion
national weather service honolulu hi
835 pm hst Mon jan 15 2018
Trade winds will increase through Thursday as a strong high
pressure system moves eastward across the central pacific basin.
Wind speeds will peak on Wednesday and Thursday into the 15 to 30
mph range with higher gusts. Shower activity will also increase as
the ridge lifts north and stronger winds help enhance windward
and mauka showers. Expect more isolated shower activity over
leeward sections of each island. Wind speeds are forecast to
weaken from Friday onward as the high pressure center drifts away
from the state into the eastern pacific and a low pressure system
moves into the central pacific.
A return to a trade wind weather pattern starts this week with a
west to east high pressure ridge lingering just north of the
hawaiian islands this evening. Strong downward vertical motions
(subsidence) under this ridge will continue to suppress windward
and mauka shower activity over the smaller islands for one more
day with trade wind temperature inversion heights ranging from
4000 to 5000 feet.
This ridge will slowly drift north over the next two days and
chances for precipitation will begin to increase tomorrow over the
windward big island as a result of decreasing subsidence over the
island with trade wind inversion heights lifting into the 5000 to
7000 foot range. Scattered showers will then spread to the
windward slopes of the smaller islands by Tuesday night into
Wednesday morning. Leeward sections will see only isolated showers
as strong winds cause a few showers to drift into the drier
south and western sections of each island.
Stronger trade winds will develop on Wednesday and Thursday with
forecast guidance consistently indicating near wind advisory
conditions over many wind favored locations of hawaii and maui
counties starting on Wednesday, with strong trade winds spreading
to the entire island chain with wind advisory conditions possible
across much of the state on Thursday.
On Friday, a low pressure system far to the northwest, near 32n
latitude, will move across the central pacific. This system will
help weaken the ridge north of hawaii from Friday through Sunday
producing weaker easterly wind speeds across the islands. The
european (ecmwf) and american (gfs) model solutions diverge a bit
with the depth and track of this system leading to differences in
the strength of the ridge and trade winds. Due to these model run
consistency issues we are blending both the american and european
model guidance for the extended forecast time period.
High pressure building north of the state will keep a light to
moderate trade wind flow in place tonight, with trades|
strengthening to moderate levels on Tuesday. Fairly dry conditions
are expected to remain in place through the TAF forecast period,
with prevailingVFR conditions at all terminals.
No airmets are currently in effect. Airmet tango may be needed for
moderate low level turbulence over and downwind of the terrain of
all islands, late Tuesday or Tuesday night.
A high surf advisory (hsa) is in effect through tonight for most
north and west facing shores on the smaller islands. The current
northwest swell is forecast to slowly subside with surf dropping
to borderline advisory levels on Tuesday.
A low about 1200 miles north of oahu this evening is producing
hurricane force winds. The low is moving rapidly northeast, so the
swell generated by the low will be rather short-lived, with
advisory level surf expected for north and west facing shores of
the smaller islands from late Tuesday night through Wednesday
night. After that, no large northwest swells are expected through
A small craft advisory (sca) remains in effect through tonight
for 10 ft seas in waters exposed to the northwest swell. The sca
for waters around kauai and oahu will likely be dropped by morning
as the swell subsides. The SCA for waters around the big island
and maui has been extended for Tuesday and Tuesday night due to
strengthening trade winds. Trade winds will become even stronger
on Wednesday and Thursday. The SCA will likely be expanded to all
waters, with gale force winds possible in the alenuihaha channel.
The strong trade winds will produce large seas that will likely
require an hsa for east facing shores late Wednesday or Thursday
through at least Friday.
Hfo watches warnings advisories
High surf advisory until 6 am hst Tuesday for niihau-kauai
windward-kauai leeward-waianae coast-oahu north shore-oahu
koolau-molokai-maui windward west-maui central valley-windward
Small craft advisory until 6 am hst Wednesday for alenuihaha
channel-big island leeward waters-big island southeast waters.
Small craft advisory until 6 am hst Tuesday for kauai northwest
waters-kauai windward waters-kauai leeward waters-kauai channel-
oahu windward waters-kaiwi channel-maui county windward waters-
big island windward waters.
Small craft advisory from 6 am Tuesday to 6 am hst Wednesday for
maalaea bay-pailolo channel.
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
Wind History for Hilo, Hilo Bay, Kuhio Bay, HI(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Hilo, Hilo International Airport, HI||84 mi||42 min||WSW 4||10.00 mi||Overcast||71°F||66°F||87%||1019.8 hPa|
Wind History from HTO (wind in knots)
|1 day ago||Calm||SW||W||SW||SW||W||SW||W||SW||SW||N||N||N||NE||NE||N||N||NE||NE||NE||N||Calm||SW||SW|
|2 days ago||SW||W||SW||SW||W||SW||SW||SW||SW||NE||N||SE||E||NE||NE||NE||NE||NE||W||SW||Calm||S||Calm|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
Click for Map
Tue -- 03:19 AM HST 2.74 feet High Tide
Tue -- 06:39 AM HST Moonrise
Tue -- 06:57 AM HST Sunrise
Tue -- 09:52 AM HST 0.57 feet Low Tide
Tue -- 02:39 PM HST 1.43 feet High Tide
Tue -- 04:18 PM HST New Moon
Tue -- 06:02 PM HST Sunset
Tue -- 06:03 PM HST Moonset
Tue -- 08:42 PM HST -0.29 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
Click for Map
Tue -- 02:52 AM HST 2.71 feet High Tide
Tue -- 06:45 AM HST Moonrise
Tue -- 07:02 AM HST Sunrise
Tue -- 09:51 AM HST 0.27 feet Low Tide
Tue -- 02:36 PM HST 1.28 feet High Tide
Tue -- 04:18 PM HST New Moon
Tue -- 06:04 PM HST Sunset
Tue -- 06:05 PM HST Moonset
Tue -- 07:51 PM HST -0.03 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Weather Map and Satellite Images(on/off)  Help
|Weather Map ||IR Satellite Image from GEOS|
GOES Local Image of Hawaii EDIT
Wind Forecast for (4,6,7,8)(on/off)  Help
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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.