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 5:52AM||Sunset 7:01PM||Monday July 24, 2017 10:50 AM HST (20:50 UTC)||Moonrise 7:20AM||Moonset 8:26PM||Illumination 2%|
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|PHZ124 Big Island Southeast Waters- 915 Am Hst Mon Jul 24 2017 |
Rest of today..East winds 15 knots. Wind waves 3 feet. Southeast swell 3 feet. Scattered showers.
Tonight..East winds 20 knots. Wind waves 6 feet. Southeast swell 3 feet. Scattered showers.
Tuesday..East winds to 25 knots. Wind waves 6 feet. Southeast swell 3 feet. Scattered showers.
Tuesday night..East winds to 25 knots. Wind waves 6 feet. Southeast swell 3 feet. Scattered showers.
Wednesday..East winds to 25 knots. Wind waves 6 feet. East swell 4 feet. Scattered showers.
Wednesday night..Northeast winds to 25 knots. Wind waves 7 feet. East swell 4 feet. Scattered showers.
Thursday..Northeast winds 20 knots. Wind waves 7 feet. East swell 3 to 4 feet. Scattered showers.
Friday..East winds 20 knots. Wind waves 5 to 6 feet. East swell 3 feet. Scattered showers.
|PHZ100 915 Am Hst Mon Jul 24 2017 |
Synopsis for hawaiian coastal waters.. A surface high will remain nearly stationary far northeast of the islands through the forecast period. A trough near oahu this morning will move west today towards kauai, and then west of kauai tonight with trade winds strengthening in its wake.
7 Day Forecast for Marine Location Near Naalehu, HIHourly EDIT Help
Area Discussion for -  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxhw60 phfo 241942|
area forecast discussion
national weather service honolulu hi
942 am hst Mon jul 24 2017
The remnants of fernanda are moving across the region from east to
west, bringing showers to the the area. This will continue to
disrupt the trade wind flow statewide, and bring muggy conditions
to the region. There remains the possibility for heavy showers or
thunderstorms today. More settled conditions should start to
return tonight as drier air and more stable air return. Breezy
trades, more sunshine, and less humid conditions are expected for
the rest of the week as high pressure well to the north of the
state regains control of our weather.
Have done a few updates so far this morning to expand the area of
thunderstorms, based on satellite and radar, and to increase pops
mainly from molokai westward. Have also issued a flash flood watch
The remnants of fernanda continue to bring showers to the region,
with the focus to the northeast of the islands. As fernanda has
opened into a surface trough currently near oahu, we have seen
heavy showers and thunderstorms form to the southwest of the
islands as well. Over the last hour or so, we have seen a bit of a
downward trend, however plenty of heavier showers and thunderstorms
remain, and the bulk of moisture is east of kauai. Kauai has
already received some rain overnight, so have issued a flash flood
watch for kauai county with the expectation of more rain as the
day wears on.
As the trough continues on its westward track today, winds will
become light and variable over kauai and oahu, with southerlies
becoming southeasterly elsewhere. This could lead to some
thunderstorm development over interior areas this afternoon. The
mid-level support is fairly weak and the surface trough is moving
right along, so if heavy showers or thunderstorms do occur, they
are not expected to last too long in any one location.
After today, the trough should exit the area, and the weather
should quiet down fairly quickly. The low level flow will return
to regularly scheduled summertime breezy trades by Tuesday,
moisture will decrease, and the trough aloft will weaken further.
Fewer showers are expected overall beyond today, but some of the
models are showing an modest increase in low level trade wind|
moisture Thursday night through Friday night. This is indicated in
the grids by a little increase in pops for this time period. A
sprawling, persistent area of high pressure to the north of the
islands will keep breezy trades blowing locally into the weekend.
A north to south surface trough, the remnant of fernanda, is near
oahu moving west at 10 kt. The trough and a low aloft are combining
to produce thunderstorms near the main hawaiian islands. The
sigmet oscar series is in effect for these thunderstorms.
The trough is producing widespread MVFR conditions and localized
ifr conditions from lanai to kauai. Airmet sierra for ifr and mtn
obsc is in effect for these conditions.
There will be gradual clearing from east to west as the trough
continues moving west.
High pressure centered far northeast of the islands will support
trade winds through the forecast period. A surface trough near
oahu this morning will cause the trade winds to temporarily
weaken across the western portion of the state today. Stronger
trade winds will begin filling in across the eastern end of the
state as early as this afternoon. The trade winds will strengthen
to small craft advisory levels by Tuesday morning for the
typically windy zones around maui county and the big island.
Moisture associated with the incoming surface trough will interact
with a broad upper air feature near the islands today. This
interaction could result in isolated thunderstorms over coastal
and offshore waters through tonight (and possibly through Tuesday
for the western offshore waters). A marine weather statement is
posted on our website with more information (see mwshfo product).
One final large high tide of the month will occur tonight. This
tide may result in coastal flooding in some areas. A special
weather statement (see spshfo product on our website) is posted to
highlight the potential hazards.
Hfo watches warnings advisories
Flash flood watch until 6 pm hst this evening for niihau-kauai.
Discussion... M ballard
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|
|ILOH1 - 1617760 - Hilo, HI||52 mi||50 min||S 5.1 G 7||88°F||81°F||1015.8 hPa (+0.9)|
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
|Kailua / Kona, Keahole Airport, HI||46 mi||57 min||NNW 17||10.00 mi||A Few Clouds||84°F||73°F||72%||1014.3 hPa|
Wind History from HKO (wind in knots)
|1 day ago||S||S||S||SW||W||W||NW||NW||NW||NW||NE||E||E||E||E||E||E||E||NE||NE||S||W||W|
|2 days ago||W||SW||SW||SW||W||W||E||S||W||W||S||SE||SE||S||SE||SE||SE||SE||E||SE||S||W||SW |
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
Click for Map
Mon -- 04:05 AM HST 1.62 feet High Tide
Mon -- 05:56 AM HST Sunrise
Mon -- 07:20 AM HST Moonrise
Mon -- 10:00 AM HST -0.45 feet Low Tide
Mon -- 05:06 PM HST 3.03 feet High Tide
Mon -- 07:00 PM HST Sunset
Mon -- 08:26 PM HST Moonset
Mon -- 11:35 PM HST 0.28 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Kailua Kona |
Click for Map
Mon -- 04:21 AM HST 1.02 feet High Tide
Mon -- 05:57 AM HST Sunrise
Mon -- 07:21 AM HST Moonrise
Mon -- 09:49 AM HST -0.04 feet Low Tide
Mon -- 04:53 PM HST 2.47 feet High Tide
Mon -- 07:03 PM HST Sunset
Mon -- 08:28 PM HST Moonset
Mon -- 11:56 PM HST 0.09 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 (16,3,4,5)(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.