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 6:42AM||Sunset 6:24PM||Friday February 23, 2018 4:37 PM HST (02:37 UTC)||Moonrise 12:31PM||Moonset 12:55AM||Illumination 64%|
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|PHZ121 Alenuihaha Channel- 305 Pm Hst Fri Feb 23 2018 |
.gale warning in effect through early Saturday morning...
.small craft advisory in effect from Saturday morning through early Monday morning...
Tonight..East winds to 35 knots. Wind waves 7 feet. Mixed swell northwest 3 feet and east 6 feet. Haze. Isolated showers and Thunderstorms.
Saturday..East winds to 30 knots. Wind waves 7 feet. Mixed swell northwest 3 feet and east 6 feet. Haze in the morning. Scattered showers and isolated Thunderstorms through the day.
Saturday night..East winds to 30 knots. Wind waves 7 feet. SWell east 6 feet. Scattered showers.
Sunday..East winds to 25 knots. Wind waves 7 feet. SWell east 6 feet. Scattered showers.
Sunday night..East winds to 25 knots. Wind waves 7 feet. SWell east 6 feet. Scattered showers in the evening, then isolated showers after midnight.
Monday..East winds to 25 knots. Wind waves 8 feet. SWell east 6 to 7 feet. Isolated showers.
Monday night..East winds to 30 knots. Wind waves 8 feet. SWell east 7 to 8 feet. Isolated showers through the night.
Tuesday..East winds to 30 knots. Wind waves 7 feet. SWell east 8 to 9 feet. Isolated showers.
Wednesday..East winds to 30 knots. Wind waves 8 to 10 feet. SWell east 9 feet. Isolated showers.
|PHZ100 305 Pm Hst Fri Feb 23 2018 |
Synopsis for hawaiian coastal waters.. Strong high pressure far north northeast of the area along with a nearly stationary surface trough northwest of kauai, will support breezy to locally windy east to southeast winds over the coastal waters through next week. An upper-level disturbance west of the area will allow for locally heavy showers and a slight chance of a Thunderstorms through the weekend.
7 Day Forecast for Marine Location Near Puako, HIHourly EDIT Help
Area Discussion for -  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxhw60 phfo 240129|
area forecast discussion
national weather service honolulu hi
329 pm hst Fri feb 23 2018
Moist and somewhat unstable conditions will persist across
portions of the state through the weekend. East to southeast
winds will focus rainfall over windward and southeast slopes. The
greatest threat for heavy showers and thunderstorms will be over
the big island tonight, then shift to the western end of the
island chain on Sunday. Drier conditions will push back over the
state early next week as potentially strong east to east-
southeast winds develop across the entire state.
A complex weather pattern continues to produce unstable conditions
over portions of the state. A strong mid to upper level low is
parked nearly 900 miles northwest of kauai. This feature is
supporting a surface trough several hundred miles west of the
state, while strong and deep high pressure remains parked about
1,700 miles to the northeast. The upper low retreated slightly
westward today, allowing some warming aloft that has led to a
slight stabilization of the atmosphere over much of the state.
However, deeper moisture pooled over and south of the big island
continues to produce moderate to briefly heavy rainfall in the
hilo, puna, and kau districts, as well as a complex of
thunderstorms 100 miles to the south. Across the rest of the
state, rainfall has been confined to windward slopes. Given recent
trends, the flash flood watch has been trimmed back to cover only
the big island, and the winter storm warning for the high big
island summits remains in place.
The complex weather pattern is also driving an unusual wind
regime. The combination of the trough to the west and the deep
high to the northeast is driving rather strong easterly winds
around the big island that rapidly veer toward the southeast over
the rest of the state. In addition, the presence of the
thunderstorm complex to the south of the big island has tightened
the local pressure gradient and resulted in localized strong and
gusty winds on the big island. In addition to usual places
affected by easterly winds such as kau and the humuula saddle,
portions of the hamakua coast should also experience localized
gusty winds. As a result, a wind advisory has been posted for the
The greatest chance for rainfall will remain over windward and
southeast slopes tonight and Saturday. Even though additional
heavy showers and thunderstorms are more likely on the big island,
they could pop up anywhere. The overall weather pattern will
change little. The mid to upper level low will drift slightly
westward, allowing some warming aloft that will lead to slight
stabilization. That said, the GFS and ECMWF models show deep
moisture lingering around the big island, which supports keeping
the flash flood watch in place for that island through at least
tonight. The models also show the thunderstorm complex holding on
to the south of the big island, which will maintain the tight
pressure gradient. This supports keeping the wind advisory posted.
Across the rest of the state, winds are expected to become more
easterly, allowing locally breezy winds to develop and keeping
showers focused on windward slopes.
Another round of potential flooding is shaping up on Sunday. A
shortwave aloft will swing around the base of the upper trough
and pass near kauai. The resulting instability will once again
increase chances for heavy showers and thunderstorms over the
western end of the state and may necessitate the re-issuance of
the flash flood watch for some islands.
Drier conditions and potentially strong and gusty easterly winds
are in store for the new work week. As the above mentioned short
wave aloft lifts off to the north on Monday, low to mid level
ridging will build in from the east. This will lead to a drying
trend on Monday and Tuesday, along with a pronounced increase in
easterly winds. By Wednesday, these winds could become strong and
gusty, and a wind advisory could be needed.|
High pressure northeast of the state and low pressure to the
west, will keep gusty east to southeast flow in place across the
island chain through tonight. A moist and unstable airmass will
remain over the island chain, particularly the E and SE areas of
the big island, where widespread MVFR and isol ifr conditions are
expected. Across the smaller islands tempo MVFR and isol ifr
conditions are possible in the heavier showers.
Airmet sierra remains in place for mountain obscuration across
e to SE facing slopes of the big island. Surface winds through the
humuula saddle of the big island have accelerated today and
airmet tango is in effect for strong winds through the saddle.
Light icing will be possible in the thick mid and high clouds
around the state.
Abundant moisture along with an unstable airmass will allow for
some isolated thunderstorms over the coastal waters through the
Strong high pressure far to the north northeast of the state will
result in breezy east to southeast winds over the coastal waters
through this weekend. Even stronger winds are expected early next
week as the high moves a bit closer to the state allowing the
pressure gradient to tighten over the area. A recent scatterometer
pass showed some gale force winds around portions of the big
island. Thus a gale warning is posted for waters around the big
island through tonight and a small craft advisory is posted for a
vast majority of the remaining coastal waters due to the winds
and associated wave heights exceeding 10 feet in some areas.
A long and rather broad fetch of easterly winds on the south side
of the high will continue to produce advisory level surf along
east facing shores through the weekend and on into early next
week. Latest guidance from the wavewatch model indicates surf
could reach warning levels as early as Monday night or Tuesday.
This combined with high astronomical tides could cause some
coastal inundation issues along some low lying areas exposed to
The current small northwest swell will lower gradually tonight
through Saturday. Otherwise surf along north and west facing
shores will be well below normal for this time of year during the
Sunday through Thursday time period. A series of small, mainly
background south swells can be expected through the weekend and on
into the middle of next week.
Hfo watches warnings advisories
High surf advisory until 6 am hst Monday for east facing shores
of kauai, oahu, molokai, maui, and the big island.
Flash flood watch through late tonight for the big island.
Wind advisory until 6 pm hst Saturday for the big island.
Winter storm warning until 6 am hst Saturday for big island
Small craft advisory from 6 am Saturday to 6 am hst Monday for
alenuihaha channel-big island windward waters-big island leeward
waters-big island southeast waters.
Gale warning until 6 am hst Saturday for alenuihaha channel-big
island windward waters-big island leeward waters-big island
Small craft advisory until 6 am hst Monday for kauai northwest
waters-kauai windward waters-oahu windward waters-kaiwi channel-
maui county windward waters.
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|
|KWHH1||0 mi||50 min||NW 6 G 8.9||82°F||78°F||1012.6 hPa|
|ILOH1 - 1617760 - Hilo, HI||46 mi||50 min||SW 1.9 G 2.9||72°F||76°F||1016.1 hPa|
|51206||49 mi||41 min||75°F||9 ft|
|KLIH1 - 1615680 - Kahului Bay, Maui, HI||68 mi||50 min||ENE 16 G 23||78°F||78°F||1013.8 hPa|
Wind History for Kawaihae, HI(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Bradshaw Army Air Field / Hawaii, HI||23 mi||42 min||SSE 11 G 18||10.00 mi||Mostly Cloudy||57°F||49°F||76%||1014.5 hPa|
Wind History from HSF (wind in knots)
|1 day ago||W||SE||Calm||Calm||Calm||W||Calm||Calm||Calm||Calm||Calm||SE||Calm||SE||S||Calm||SE||S|
|2 days ago||W||W||W||Calm||Calm||S||SE||Calm||SE||SE||N||SE||SE||N||S||S||Calm||S||S||SW||SW||SW||W |
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
Click for Map
Fri -- 12:55 AM HST Moonset
Fri -- 05:24 AM HST 0.66 feet Low Tide
Fri -- 06:47 AM HST Sunrise
Fri -- 09:39 AM HST 0.94 feet High Tide
Fri -- 12:31 PM HST Moonrise
Fri -- 03:54 PM HST 0.10 feet Low Tide
Fri -- 06:26 PM HST Sunset
Fri -- 11:39 PM HST 2.03 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Kailua Kona |
Click for Map
Fri -- 12:55 AM HST Moonset
Fri -- 04:43 AM HST 0.69 feet Low Tide
Fri -- 06:47 AM HST Sunrise
Fri -- 08:45 AM HST 1.00 feet High Tide
Fri -- 12:32 PM HST Moonrise
Fri -- 03:50 PM HST 0.04 feet Low Tide
Fri -- 06:27 PM HST Sunset
Fri -- 11:45 PM HST 1.69 feet High 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 (21,6,7,8)(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.