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 6:59AM||Sunset 5:52PM||Sunday December 10, 2017 7:53 PM HST (05:53 UTC)||Moonrise 12:38AM||Moonset 1:19PM||Illumination 47%|
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|PHZ111 Kauai Windward Waters- 324 Pm Hst Sun Dec 10 2017 |
.small craft advisory in effect through early Monday morning...
Tonight..Southeast winds 10 knots. Wind waves around 3 feet this evening, then around 2 feet or less. North swell 10 feet. A chance of showers after midnight.
Monday..Winds variable less than 10 knots. Wind waves around 2 feet or less. Northwest swell 7 feet. Hazy. A chance of showers.
Monday night..West winds 10 knots. Wind waves around 2 feet or less, then around 3 feet after midnight. Northwest swell 6 feet. Hazy. Showers likely.
Tuesday..Northwest winds 15 knots. Wind waves around 3 feet. North swell 9 feet, increasing to 11 feet in the afternoon. Occasional showers, mainly in the morning.
Tuesday night..North winds 15 knots. Wind waves around 4 feet. Northwest swell 17 feet. Isolated showers in the evening, then scattered showers after midnight.
Wednesday..Northeast winds 15 knots. Wind waves around 5 feet. Northwest swell 18 feet, decreasing to 16 feet in the afternoon. Isolated showers in the morning.
Wednesday night..Northeast winds 20 knots. Wind waves around 7 feet. Northwest swell 14 feet. Isolated showers.
Thursday..Northeast winds to 25 knots. Wind waves 10 to 11 feet. Northwest swell 10 to 12 feet. Scattered showers.
Friday..East winds 20 knots. Wind waves 8 to 10 feet. Northwest swell 6 to 8 feet. Showers likely.
|PHZ100 324 Pm Hst Sun Dec 10 2017 |
Synopsis for hawaiian coastal waters.. The current north-northwest swell will decline tonight and Monday, before another larger swell arrives late Tuesday, and peaks Tuesday night into Wednesday. A new front is expected to move down the island chain Tuesday through Wednesday morning, with increasing north to northeast winds behind the front.
7 Day Forecast for Marine Location Near Kalihiwai, HIHourly EDIT Help
Area Discussion for -  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxhw60 phfo 110145|
area forecast discussion
national weather service honolulu hi
345 pm hst Sun dec 10 2017
Moisture associated with a dissipating front will bring clouds and a
few showers to windward areas of oahu and maui county this evening
before gradually dissipating overnight. Light winds will prevail
through Monday, then increase late Monday into Tuesday as a stronger
front moves down the island chain Tuesday. The front will bring a
period of showers, followed by cool, breezy and mostly dry north
winds on Wednesday and Thursday. There is the potential for
unsettled weather toward the end of the week as a low pressure
system develops near the islands.
Shallow moisture associated with a stalled and dissipating front is
draped over the central portion of the island chain this afternoon,
fueling a few mostly windward showers from oahu to maui while kauai
and the big island have been dry today. A fast-moving and relatively
weak high pressure cell is passing several hundred miles NE of the
islands, supporting a light to moderate low-level flow that is
currently veering from E to se. Water vapor imagery shows a ridge
aloft building over the area from the w, while afternoon soundings
highlight a dry and stable atmosphere with pwat < 1" and a
subsidence inversion based between 6 and 8 kft. A cold front about
875 miles NW of kauai is moving rapidly se.
As the high to the NE moves swiftly E in response to the rapidly
approaching front, an associated ridge will move over the islands
from the NW overnight, and the low-level flow over the area will
weaken and veer to the s. This will allow the remnant showers to
lift n, as developing land breezes likely preclude their ability to
move ashore after midnight.
Light S to SW winds Monday will strengthen somewhat near kauai and
oahu as the front draws closer Monday night, with increasing pre-
frontal showers. Frontal passage is depicted as occurring on kauai
late Tuesday morning in latest gfs ECMWF guidance, oahu and maui
county Tuesday evening, and Wednesday on the big island. With
limited upper-level support, the front is not expected to bring a
significant flood threat. However, moisture up to about ~12 kft will
allow for some briefly heavy downpours to develop both in the pre-
frontal bands that are expected to develop near kauai and oahu
Monday night, and along the frontal band as it passes over all
islands. Breezy, cool and mostly dry weather will move in from the n
and NE after the front passes, with this general weather pattern
expected to continue into Friday.
After Thursday however, forecast uncertainty increases dramatically
as forecast models have been exhibiting a fair amount of run-to-run
variability, due to the shortwave diving SE toward the islands by
mid-week. The 12z gfs ECMWF cmc indciate that the shortwave will
develop into a cutoff low just E of the islands on Thursday, and
then drift W over the islands Friday and Saturday before gradually
dissipating Sunday and Monday. If this scenario develops, island
weather would become very active, with the potential for heavy rain
and thunderstorms, as well as snowfall and high winds at the big
island summits. However, if the navgem is correct (and now the 18z
gfs) the cutoff would remain E of the islands, and the impacts on
island weather would be significantly less. With confidence in the
large scale weather pattern so diminished, the details of the|
forecast are highly uncertain, and no significant changes to the
longer range forecast are expected at this time.
Airmet sierra for mtn obsc is in effect for maui, lanai, molokai and
oahu. An ene-wsw frontal cloud band over maui, lanai, molokai and
will produce widespread MVFR ceilings and scattered showers through
the evening. The cloud band is forecast to shift N ahead of another
front approaching from the nw. As the cloud band shifts n,
conditions are expected to improve over maui and lanai.
Vfr will prevail at the terminals on kauai, the big island and
leeward oahu with MVFR on maui, lanai and molokai and windward oahu.
The current large north-northwest swell should be nearing its peak
this afternoon at least over the western islands, and this evening
near the big island. Warning level surf will continue on the north
and west facing shores of the smaller islands exposed to the surf,
and advisory level remaining on the north facing of the big island
tonight. This swell will continue to decline through Monday night.
Expect the warning to be downgraded to an advisory by morning. Surf
along the north facing shores of the big island are expected to be
below advisory by Monday morning.
This current swell is bringing seas in excess of 10 feet to exposed
waters, and an SCA remains posted through tonight. Seas are expected
to lower tonight from west to east. A few areas may need to have the
sca extended tomorrow morning depending on how quickly the seas drop
The next north-northwest swell is expected to peak Tuesday
night early Wednesday and is expected to be even larger than the
current swell. This swell is expected to produce warning-level surf
on north and west facing shores. This swell will also bring seas in
excess of 10 feet. The current forecast brings 10 foot seas to the
kauai northwest waters as early as midday Tuesday.
A new front will move down the island chain Tuesday Wednesday, with
northerly winds increasing behind the front. Winds behind this next
front will likely reach SCA levels by Wednesday night.
See the latest oahu surf discussion (srdhfo) for additional details
on surf and swell.
Hfo watches warnings advisories
High surf warning until 6 am hst Monday for north and west facing
shores of niihau kauai oahu molokai and maui.
High surf advisory until 6 am hst Monday for north facing shores of
the big island.
Small craft advisory until 6 am hst Monday for kauai northwest
waters-kauai windward waters-kauai leeward waters-kauai channel-
oahu windward waters-oahu leeward waters-kaiwi channel-maui
county windward waters-maui county leeward waters-alenuihaha
channel-big island windward waters.
marine... 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|
|51208||9 mi||62 min||76°F||10 ft|
|NWWH1 - 1611400 - Nawiliwili, HI||19 mi||54 min||WSW 2.9 G 4.1||69°F||1015.2 hPa (+0.7)|
|51201 - Waimea Bay, HI (106)||79 mi||52 min||75°F||11 ft|
|51WH0 - WHOTS - Woods Hole Ocean Time-series||84 mi||84 min||73°F||76°F||1014.6 hPa||62°F|
Wind History for Nawiliwili, HI(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Lihue, Lihue Airport, HI||17 mi||61 min||N 0||10.00 mi||Fair||67°F||63°F||87%||1015.1 hPa|
|Kekaha, Pacific Missile Test Facility Barking Sands, HI||21 mi||58 min||E 3||10.00 mi||A Few Clouds||71°F||64°F||81%||1014.5 hPa|
Wind History from HLI (wind in knots)
|1 day ago||W||W||W||W||W||W||W||SW||W||W||W||W||W||SW||Calm||SE||SE||SE||S||E||NE||N||N||N|
|2 days ago||W||W||W||W||SW||W||W||W||W||W||W||W||W||SW||S||S||SE||SE||E||S||N||N||NW||W |
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Hanalei Bay |
Click for Map
Mon -- 01:32 AM HST Moonrise
Mon -- 03:37 AM HST 0.78 feet Low Tide
Mon -- 07:07 AM HST Sunrise
Mon -- 09:29 AM HST 1.44 feet High Tide
Mon -- 01:57 PM HST Moonset
Mon -- 04:08 PM HST 0.02 feet Low Tide
Mon -- 05:55 PM HST Sunset
Mon -- 11:31 PM HST 1.56 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Hanamaulu Bay |
Click for Map
Mon -- 01:31 AM HST Moonrise
Mon -- 05:03 AM HST 0.78 feet Low Tide
Mon -- 07:06 AM HST Sunrise
Mon -- 10:40 AM HST 1.34 feet High Tide
Mon -- 01:56 PM HST Moonset
Mon -- 05:34 PM HST 0.02 feet Low Tide
Mon -- 05:55 PM HST Sunset
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 (0,6,7,8)(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.