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 6:39AM||Sunset 5:44PM||Monday November 20, 2017 3:39 AM HST (13:39 UTC)||Moonrise 8:31AM||Moonset 7:50PM||Illumination 3%|
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|PHZ119 Maalaea Bay- 937 Pm Hst Sun Nov 19 2017 |
Rest of tonight..Northeast winds 10 knots. Wind waves 2 feet or less.
Monday..Northeast winds 15 knots. Wind waves 2 feet or less.
Monday night..Northeast winds 15 knots. Wind waves 2 feet or less.
Tuesday..North winds 10 knots. Wind waves 2 feet or less.
Tuesday night..North winds 15 knots. Wind waves 2 feet or less.
Wednesday..North winds 15 knots. Wind waves 2 feet or less.
Wednesday night..Northeast winds 15 knots. Wind waves 2 feet or less.
Thursday..North winds to 25 knots. Wind waves 3 feet.
Friday..North winds to 25 knots. Wind waves 3 feet.
|PHZ100 937 Pm Hst Sun Nov 19 2017 |
Synopsis for hawaiian coastal waters.. A surface low far northeast of the state will keep light to moderate north winds over the coastal waters through Monday, before lifting away from the area. High pressure will build northwest of the area. This will result in strong and gusty northeast trade winds during the second half of the week.
7 Day Forecast for Marine Location Near Launiupoko, HIHourly EDIT Help
Area Discussion for -  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxhw60 phfo 201335|
area forecast discussion
national weather service honolulu hi
335 am hst Mon nov 20 2017
Cool northerly breezes will continue today, and then turn toward the
northeast Tuesday and Wednesday. Low clouds will focus along north
and northeast facing slopes and coasts, dropping a few showers that
will be most active during nights and mornings. Gusty trade winds
are expected thanksgiving and Friday before easing slightly by next
weekend, with windward showers occasionally spreading leeward.
Currently, the low-level gradient between a surface high to the
distant NW and a low to the NE is supporting light to moderate n
winds. This flow continues to usher a cool air mass over the
islands, with dew points in the mid- to upper-50s. Varying amounts
of low clouds are streaming toward the islands from the n, with
broken to overcast low clouds over the area from molokai westward,
and much fewer low clouds over the remainder of maui county and the
big island (except for the hamakua coast where low clouds remain
anchored to the terrain by the wind).
Low clouds near the islands have shown a strong diurnal trend over
the past day or so, with cloud and shower coverage increasing at
night and diminishing during the day in response to cloud-top
cooling heating. This is expected to continue, and the pop sky
forecast attempts to capture this over the next day or two.
Now that a shortwave moving through the trough aloft near the
islands has moved E of the area, winds over the summits of the big
island have steadily diminished overnight, and the high wind warning
has been cancelled. However, winds remain sufficiently strong to
warrant a wind advisory, and this is in effect through today, with
winds expected to continue weakening. Although a trough aloft is
expected to remain over the area this week, strong winds are not
expected to return to the summits.
Over the next 72 hours, the low to the NE will move gradually move
away to the ne, in response to a new low developing to the distant n
of the islands. The shortwave supporting this new low is not
expected to dig as far S as this weekend's low, which will allow the
high to the NW to build E slightly. Net result is expected to be a
subtle veering of low-level winds to the NE Tuesday and Wednesday.
Ene winds will increase Thursday and Friday as the high moves e,
increasingly exerting its influence on island winds. As the high
continues to moves E and SE toward the end of the week, E trades are
expected, with a slight decrease in wind speeds possible by next
weekend. Showers will be focused along windward slopes, though some
may periodically spread leeward on the brisk trade winds.
A trough aloft will extend over the area from the NE for the bulk of
the next week, but warming mid-level temperatures (and relatively
low pwat) should act to limit shower coverage and intensity over the
next couple of days. A shot of cooler air moving into the trough
around thanksgiving may act to make trade showers more active.
Cool northerly winds and unstable cloud bands drifting into hawaii
will bring periods of showers. The highest coverage for shower
activity will favor mountain areas and the northern slopes of all
islands.VFR conditions will prevail with only brief periods of MVFR|
conditions in showers.
No airmets are in effect and none are expected.
The subsiding process has started for the north swell affecting the
islands. The high surf warning for the north shores of kauai and
niihau is to be downgraded shortly to a high surf advisory. This
advisory will be good to until 6 pm hst this afternoon. The high
surf advisory governing the north facing shores of the other islands
will continue through 6 pm hst this afternoon as well. There is the
possibility that this advisory will be extended through tonight. We
will see how this swell trends as the day progresses, but we
anticipate that this swell will dip below advisory criteria for the
north facing shores by 6 pm hst this afternoon. All near-shore buoys
are running around 10 feet significant wave height this past hour.
A small craft advisory (sca) is in effect for most of the waters
this early Monday morning, mainly due to the large north swell
causing the combined seas to be above the 10-foot limit. The SCA is
good to until 6 pm hst this afternoon, and there is a good chance
that this will happen.
This SCA flag will likely be hoisted again on Wednesday as the next
large open ocean swell rolls in from the north. This new swell is in
the works now as a storm-force low forms in the gulf of alaska. Its
size is likely to be a few feet larger than the current fading swell
which maxed out at around 14 feet. It will have a longer period at
14 to 16 seconds. Warning level surf will likely affect the north
facing shores of all islands exposed to this swell well into Friday.
The source of the fading north swell, a low pressure area 800 nm
northeast of the islands, is forecast to move on after today. In its
place, a moderately strong high pressure cell (1032 mb) will settle
in about a thousand nm north-northwest of the islands. This will
result in strengthening trades to moderate to strong across the
hawaiian islands area between Tuesday night and Thursday. Therefore,
the SCA will not only pertain to the combined seas from the large
north swell, but also the strong and gusty trade winds. More so, the
trades may be strong enough to warrant gale warnings for some of the
channels between Wednesday night and Friday night. Lastly, the
locally generated trade winds will build a swell large enough to
prompt issuance a high surf advisory for the east facing shores as
early as Thursday. The trades will soften slightly over the upcoming
A series of small but long period swells of at least 15 seconds will
arrive this week. These swells will keep the surf from going flat
along the south facing shores.
Hfo watches warnings advisories
High surf advisory until 6 pm hst today for north facing shores of
niihau, kauai, oahu, molokai, maui and the big island.
Wind advisory until 6 pm hst today for big island summits.
Small craft advisory until 6 pm hst today for all waters except
maalaea bay and areas south and west of the big island.
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
|Stations||Dist||Age||Wind||Air Temp||Water Temp||Waves||Pressure||DewPt|
|KLIH1 - 1615680 - Kahului Bay, Maui, HI||12 mi||58 min||SSE 1 G 2.9||64°F||78°F||1011.3 hPa|
|51202 - Mokapu Point, HI (098)||66 mi||66 min||79°F||9 ft|
Wind History for Kahului, Kahului Harbor, HI(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Kahului, Kahului Airport, HI||14 mi||46 min||SSE 3||10.00 mi||Fair||61°F||57°F||87%||1011.8 hPa|
|Lanai City, Lanai Airport, HI||15 mi||44 min||N 9||10.00 mi||Fair||62°F||55°F||78%||1011.5 hPa|
Wind History from HJH (wind in knots)
|1 day ago||E||NE||NE||N||N||NW||N||N||NW||N||NE||NE|
|2 days ago||NE||NE||N||NE||NE||NE|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
Click for Map
Mon -- 04:38 AM HST 2.37 feet High Tide
Mon -- 06:40 AM HST Sunrise
Mon -- 08:31 AM HST Moonrise
Mon -- 11:48 AM HST 0.50 feet Low Tide
Mon -- 04:26 PM HST 1.02 feet High Tide
Mon -- 05:44 PM HST Sunset
Mon -- 07:50 PM HST Moonset
Mon -- 09:40 PM HST 0.28 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
Click for Map
Mon -- 03:43 AM HST 2.59 feet High Tide
Mon -- 06:39 AM HST Sunrise
Mon -- 08:30 AM HST Moonrise
Mon -- 10:08 AM HST 0.91 feet Low Tide
Mon -- 02:31 PM HST 1.45 feet High Tide
Mon -- 05:43 PM HST Sunset
Mon -- 07:49 PM HST Moonset
Mon -- 08:54 PM HST -0.12 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 (8,2,3,4)(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.