Marine Weather and Tides
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
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|Sunrise 6:17AM||Sunset 6:34PM||Saturday March 25, 2017 7:30 PM HST (05:30 UTC)||Moonrise 4:45AM||Moonset 4:40PM||Illumination 2%|
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|PHZ123 Big Island Leeward Waters- 331 Pm Hst Sat Mar 25 2017 |
.small craft advisory in effect through early Monday morning...
Tonight..Winds variable less than 10 kt west of the big island...east to 25 kt near south point. Wind waves 8 ft. Northwest swell 6 ft. Haze.
Sunday..Winds variable less than 10 kt west of the big island... East to 30 kt near south point. Wind waves 8 ft. Northwest swell 8 ft. Haze.
Sunday night..Winds variable less than 10 kt west of the big island...east to 30 kt near south point. Wind waves 8 ft. Northwest swell 8 ft. Haze through the night. Isolated showers through the night.
Monday..West of the big island...winds variable less than 10 kt becoming southwest 10 kt in the afternoon. NEar south point... East winds 20 kt. Wind waves 6 ft. Northwest swell 7 ft. Isolated showers in the morning. Haze through the day.
Monday night..Winds variable less than 10 kt west of the big island...east 20 kt near south point. Wind waves 6 ft. Northwest swell 6 ft. Haze through the night. Isolated showers in the evening. Scattered showers after midnight.
Tuesday..West of the big island...winds variable less than 10 kt becoming west 10 kt in the afternoon. NEar south point... East winds 20 kt. Wind waves 6 ft. Northwest swell 5 ft. Scattered showers in the morning. Haze through the day.
Tuesday night..Winds variable less than 10 kt west of the big island...east 20 kt near south point. Wind waves 6 ft. Northwest swell 5 ft. Haze through the night. Isolated showers through the night.
Wednesday..West of the big island...winds variable less than 10 kt becoming northwest 10 kt in the afternoon...then becoming variable less than 10 kt. NEar south point...east winds to 25 kt. Wind waves 6 to 7 ft. Northwest swell 5 ft. Haze. Isolated showers.
Thursday..West of the big island...northwest winds 10 kt becoming variable less than 10 kt. NEar south point...east winds 20 kt. Wind waves 6 ft. Northwest swell 4 to 5 ft. Haze. Isolated showers.
|PHZ100 331 Pm Hst Sat Mar 25 2017 |
Synopsis for hawaiian coastal waters.. High pressure northeast of the state will strengthen over the next few days providing locally breezy trade winds through the weekend. Winds will ease slightly early next week as the high moves further from the state. A large west-northwest swell will spread across the waters tonight peaking late tonight into Sunday.
7 Day Forecast for Marine Location Near Holualoa, HIHourly EDIT Help
Area Discussion for -  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxhw60 phfo 260144|
area forecast discussion
national weather service honolulu hi
344 pm hst Sat mar 25 2017
A persistent ridge of high pressure north of the islands will keep
trade winds blowing through late next week, with locally breezy
levels expected through the weekend. A dry and stable airmass will
keep showers limited and confined primarily to windward slopes
through early next week. An increase in trade wind showers is then
expected Tuesday night through late next week as upper level
troughing sets up over the island chain.
Currently at the surface, a 1025 mb high is centered around 800
miles north of honolulu, with another 1026 mb high located around
1000 miles northeast of honolulu. In between these two highs is a
weakening and nearly stationary front, roughly 450 miles north of
kauai. Moderate to breezy trade winds have become established
across the state this afternoon, with a few observation sites
flirting with wind advisory levels through the saddle region and
near kamuela on the big island and in the maui central valley near
maalea bay. Mimic total precipitable water (pw) imagery shows a
dry airmass over the island chain with pw values at or below 1
inch. This correlates well with the 00z soundings from phto and
phli which came in with pw values of 0.78 and 0.84 inches
respectively. Additionally both of the afternoon soundings showed
a stable airmass firmly encompassing the island chain, with a
sharp low level inversion around 3kft at each site. Satellite and
radar imagery also reflect the dry airmass over the islands, with
clear to partly cloudy skies and little if any shower activity.
Main short term concern continues to revolve around the building
large northwest swell moving into the islands.
Tonight through Tuesday,
the pair of high pressure areas north of the islands will
consolidate into a single high well northeast of the state
through the weekend, keeping a fairly tight pressure gradient
in place across the islands. As a result, moderate to breezy
trade winds are expected to continue through Sunday night, with
the trade wind speeds then dropping off a notch early next week as
high pressure lifts further northeast and away from island chain.
A dry and stable airmass is expected to limit shower activity
through the period, with pw values remaining around or slightly
below 1 inch. Showers will favor windward and mauka areas,
primarily during the overnight and early morning hours.
Tuesday night through Friday,
model solutions are in good agreement showing high pressure
remaining anchored well to the northeast of the state through the
period, with a weakening front approaching from the northwest late
in the week. Light to moderate trades are expected to prevail
through the period, with some decrease in trade wind speeds
possible by the end of the week depending on the proximity of the
approaching front to the island chain. Aloft, a weakness in the
upper level ridge is expected to move overhead during the middle
and latter part of next week, and this should de-stabilize the
airmass a bit. This in combination with increasing boundary layer
moisture resulting from the persistent easterly trades, should
lead to an increase in trade wind showers across the islands.
Showers will continue to favor windward and mauka areas, with
activity most prevalent during the overnight and early morning
Airmet tango for low level turbulence over and immediately south
through west of the mountains remains posted for the islands.
Winds will continue to remain locally breezy through Sunday.
Afternoon soundings from phto and phli continue to show the strong
low level inversion near 3 kft. Model guidance keeps the
inversion between 3-4 kft for tomorrow. Airmet tango will likely|
stay posted through at least Sunday.
Scattered low clouds and isolated light showers will favor the
windward and mountain areas, with predominatelyVFR skies for much
of the night. The windward areas of the big island and maui may
see a slight uptick in showers by early tomorrow morning as
another slug of moisture comes in from the east.
A large west-northwest (wnw) swell has entered the area with the
cdip hanalei, kauai buoy at 2 pm hst reporting a swell height of
8.4 feet every 20 seconds from 294 degrees. This swell will work
its way along the main hawaiian islands with a peak expected late
tonight through Sunday.
Surf on kauai will continue to build to warning levels (25 ft
north shores/20 ft west shores) through this afternoon, then peak
tonight into Sunday morning. Warning level surf should continue
through the day Sunday before gradually subsiding early next
week. The more westerly direction of the swell will likely cause
kauai to shadow the other smaller islands. The current forecast
continues to hold surf for exposed north and west facing shores of
oahu and maui county just under warning levels. We will continue
to monitor observations as they come in, but for now the reports
from the automated stations are very close to the projections from
the forecast models. If a slightly larger or more northwest swell
occurs this could bring warning level surf to oahu/maui county.
Surf along west facing shores of the big island is also forecast
to reach low-end warning level (12 ft) tonight through Sunday
night. A high surf warning has been posted for north/west facing
shores of niihau and kauai, and for the west facing shores of the
big island. A high surf advisory has been posted for north/west
facing shores of oahu and molokai, and for north facing shores of
Otherwise, small long period south swells will continue through
this weekend and into next week, with a slightly larger long
period south swell forecast for Wednesday night through Friday.
Another large wnw swell will be possible from next Friday into
the following weekend.
The small craft advisory (sca) remains posted for the typically
windier waters around the big island and maui county through
Sunday night. High pressure strengthening northeast of the state
will provide locally breezy conditions through the weekend.
Since the large wnw swell will bring the significant wave height
to at least 10 feet a SCA is in effect tonight through Sunday
night for the remaining waters.
High surf advisory until 6 am hst Monday for waianae coast-oahu
north shore-oahu koolau-molokai-maui windward west-maui central
High surf warning until 6 am hst Monday for niihau-kauai
High surf warning from 6 pm this evening to 6 am hst Monday for
kona-south big island-kohala.
Small craft advisory until 6 am hst Monday for kauai northwest
waters-kauai windward waters-kauai leeward waters-kauai channel-
oahu windward waters-kaiwi channel-maui county windward waters-
maalaea bay-pailolo channel-alenuihaha channel-big island
leeward waters-big island southeast waters.
Small craft advisory from 6 pm this evening to 6 am hst Monday
for oahu leeward waters-maui county leeward waters-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|
|KWHH1||28 mi||42 min||SW 4.1 G 5.1||78°F||81°F||1019.8 hPa|
|ILOH1 - 1617760 - Hilo, HI||50 mi||48 min||SE 2.9 G 7||78°F||76°F||1021.8 hPa|
|KLIH1 - 1615680 - Kahului Bay, Maui, HI||90 mi||48 min||NE 15 G 20||76°F||78°F||1020.2 hPa|
|51203 - Kaumalapau, HI (146)||95 mi||45 min||79°F||4 ft|
Wind History for Kawaihae, HI(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Kailua / Kona, Keahole Airport, HI||0 mi||37 min||SSW 7||10.00 mi||Fair||79°F||66°F||67%||1019.3 hPa|
Wind History from HKO (wind in knots)
|1 day ago||W||Calm||S||S||SE||SE||SE||E||E||NE||NE||NE||N||N||NW||NW||NW||W||SW||S||S||S||S||SE|
|2 days ago||S||SE||SE||E||E||E||E||E||E||E||E||E||Calm||SW||W||NW||NW||W||SW||SW||SW||W||W||W |
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Kailua Kona |
Click for Map
Sun -- 02:41 AM HST 1.88 feet High Tide
Sun -- 05:29 AM HST Moonrise
Sun -- 06:22 AM HST Sunrise
Sun -- 09:11 AM HST -0.07 feet Low Tide
Sun -- 03:07 PM HST 1.48 feet High Tide
Sun -- 05:38 PM HST Moonset
Sun -- 06:36 PM HST Sunset
Sun -- 09:04 PM HST -0.01 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
Click for Map
Sun -- 03:05 AM HST 2.13 feet High Tide
Sun -- 05:29 AM HST Moonrise
Sun -- 06:21 AM HST Sunrise
Sun -- 09:31 AM HST -0.01 feet Low Tide
Sun -- 03:31 PM HST 1.72 feet High Tide
Sun -- 05:37 PM HST Moonset
Sun -- 06:36 PM HST Sunset
Sun -- 09:25 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 (1,6,7,8)(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.