Marine Weather and Tides
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 5:40AM||Sunset 6:55PM||Friday May 26, 2017 2:35 PM HST (00:35 UTC)||Moonrise 6:46AM||Moonset 8:14PM||Illumination 2%|
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|PHZ122 Big Island Windward Waters- 1005 Am Hst Fri May 26 2017 |
Rest of today..Northeast winds 15 knots. Wind waves 3 feet. North swell 3 feet. Isolated showers.
Tonight..East winds 10 knots. Wind waves 3 feet in the evening then 2 feet or less. Mixed swell north 3 feet and southwest 3 feet. Isolated showers.
Saturday..East winds 10 knots. Wind waves 2 feet or less then 3 feet in the afternoon. Mixed swell north 3 feet and southwest 5 feet. Isolated showers through the day.
Saturday night..Northeast winds 15 knots backing southwest after midnight. Wind waves 3 feet. Mixed swell north 3 feet and southwest 4 to 5 feet. Isolated showers in the evening...then scattered showers after midnight.
Sunday..East winds 15 knots. Wind waves 3 feet. Mixed swell northeast 3 feet and southwest 4 feet. Haze through the day. Scattered showers in the morning. Isolated showers in the afternoon.
Sunday night..East winds 10 knots. Wind waves 3 feet. Mixed swell northeast 3 feet and west 3 to 4 feet. Haze. Scattered showers.
Monday..East winds 10 knots. Wind waves 3 to 4 feet. Mixed swell north 3 feet and south 3 feet. Haze. Scattered showers.
Tuesday..East winds 15 knots. Wind waves 4 to 5 feet. North swell 3 to 4 feet. Scattered showers.
|PHZ100 1005 Am Hst Fri May 26 2017 |
Synopsis for hawaiian coastal waters.. High pressure centered far north northwest of the state is forecast to weaken through the holiday weekend. A low pressure system will remain northeast of the local area resulting in lighter winds through the first half of next week.
7 Day Forecast for Marine Location Near Hilo, HIHourly EDIT Help
Area Discussion for -  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxhw60 phfo 262007|
area forecast discussion
national weather service honolulu hi
1007 am hst Fri may 26 2017
High pressure northwest of the state will slowly weaken as it
shifts southward through the memorial day weekend, with light
trade winds and localized land and sea breezes prevailing across
the island chain. As a result, showers will favor windward areas
during the overnight and early morning hours, and the interior
and leeward sections of the islands during afternoons and
evenings. Typical trade wind weather is expected to return on
Tuesday and continue through the end of next week, with showers
remaining confined primarily to windward and mauka areas.
Currently at the surface, a 1032 mb high is centered around 1400
miles northwest of kauai. Meanwhile, a weak 1016 mb low is
located around 1250 miles north-northeast of the state, with a
weakening front extending south and southwest to a location around
175 miles north of oahu. This is resulting in a light
northeasterly trade wind flow across the island chain this
morning, with localized land breezes transitioning into sea
breezes in some areas. Satellite imagery shows clear to partly
cloudy skies from oahu to the big island, with mostly cloudy
conditions over much of kauai. Radar imagery shows a few showers
over kauai and niihau, with rain free conditions over the
remainder of the state. Main short term concerns revolve around
rain chances as well as the incoming high surf and elevated tide
Today through memorial day,
the weakening front to the north of the islands will slowly
dissipated through the memorial day weekend, while high pressure
to the northwest of the state weakens and sinks southward. As a
result a weak pressure pattern will keep winds light across the
island chain through the holiday weekend, with a general light
background trade wind flow, along with daytime sea breezes and
overnight land breezes developing in some areas. Meanwhile aloft,
broad upper level troughing will remain over the state through
Sunday, with the trough axis moving overhead from northwest to
southeast Saturday through early Sunday. Upper level ridging will
then build in from the west for the tail end of the memorial day
As for sensible weather details, with the light background trade
winds and localized sea land breezes expected today through the
holiday weekend, showers are expected to favor windward areas
during the overnight and early morning hours and the
interior leeward sections of the islands during afternoons and
evenings. Shower coverage is expected to be higher over oahu and
especially kauai today as some deeper moisture associated with
the eastern extent of a mid-level trough remains over those areas.
This mid-level trough (around 700 mb) will then depart to the
southwest tonight. Showers are expected to end in the evening in
most areas, with some isolated showers continuing to drift in on
the light trades over windward areas through the overnight hours.
With the upper level trough axis swinging through the state
Saturday into Sunday, the coverage of afternoon evening showers
will likely be a bit higher, with some localized downpours
possible. Shower coverage should be on the decline Sunday night
through memorial day, as upper level ridging begins building in
from the west.
Monday night through next Friday,
high pressure northeast of the state will build westward to the
north of the islands through late next week. This will bring
trade winds back to the island chain beginning Monday night, with
speeds reaching moderate levels Tuesday through the end of next|
week. Aloft, upper level ridging will remain over the islands
through much of next week, and this will keep the airmass fairly
stable. As a result, showers will be confined primarily to
windward and mauka areas through the period, with rainfall
amounts remaining light.
A high pressure center northwest of hawaii will continue to
produce light northeasterly trade winds for the next 48 hours
with a daytime onshore sea breeze trend starting on Saturday
afternoon over western slopes of all islands.
MostlyVFR conditions expected.
No airmets currently in effect.
Surf along south facing shores will steadily rise through the day
today, peak tonight through Saturday, then slowly ease into next
week. The offshore ndbc buoys south of the islands continue to
reflect increasing long period energy within the 17 to 21 second
bands. Surf should reach advisory levels by tonight, then hold
through Saturday. A high surf advisory remains in effect for
exposed south facing shores through Saturday night. Please see
the coastal hazard message (cfwhfo) on our website for more
information about the surf. Although the surf will likely dip
below advisory levels by the end of the weekend, this source will
be long-lived and continue into next week before completely
fading. A small, long-period south swell (170-190 deg) is
expected to arrive late next week. Otherwise, no significant
sources out of the south are expected Wednesday through the
In addition to the building surf along south facing shores,
coastal flooding impacts associated with record-level king tides
will continue each day along all shores through the memorial day
weekend, especially for maui county and oahu. Beaches and
shorelines, boat ramps and docks, and vulnerable low-lying roads
and structures will be impacted during these late afternoon and
early evening high tides. Please see the special weather statement
(spshfo) product on our website for more information about the
potential impacts from the high tides and incoming south swell.
Trade winds will continue to weaken over the upcoming holiday
weekend as the ridge weakens in response to an area of low
pressure well northeast of the state. Land sea breeze conditions
are expected each day over the weekend and early next week, which
will allow the seas to trend down locally.
Surf along east facing shores will trend down through the weekend
as the trades relax. A small north-northeast swell, however, will
support small surf continuing at the exposed spots each day
Models remains persistent and show a small to moderate northwest
(330 deg) swell filling in Monday night through midweek due to a
low pressure system tracking east of the date line over the
weekend and deepening as it passes north of the state Sunday
through Monday. Otherwise, small surf is expected to persist each
day, mainly at the locations exposed to north-northeast swell.
Hfo watches warnings advisories
High surf advisory until 6 am hst Sunday for niihau-kauai
windward-kauai leeward-oahu south shore-waianae coast-molokai
leeward-lanai makai-kahoolawe-maui leeward west-windward
haleakala-leeward haleakala-kona-south big island-big island
north and east.
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||1 mi||48 min||NNE 6 G 11||80°F||79°F||1014.8 hPa|
|KWHH1||45 mi||48 min||SW 8 G 9.9||81°F||80°F||1014.5 hPa|
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
|Hilo, Hilo International Airport, HI||1 mi||43 min||ENE 11||10.00 mi||Partly Cloudy||81°F||66°F||61%||1014.9 hPa|
Wind History from HTO (wind in knots)
|1 day ago||NE||NE||NE||NE||E||E||Calm||SW||SW||SW||SW||SW||SW||SW||W||W||NW||N||N||N||NE||N||N|
|2 days ago||NE||NE||SE||SW||W||W||SW||SW||W||SW||SW||SW||SW||SW||SW||SW||W||N||NW||NE||NE||NE||NE||NE |
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
Click for Map
Fri -- 02:59 AM HST 1.53 feet High Tide
Fri -- 05:41 AM HST Sunrise
Fri -- 06:46 AM HST Moonrise
Fri -- 09:09 AM HST -0.75 feet Low Tide
Fri -- 04:18 PM HST 3.01 feet High Tide
Fri -- 06:53 PM HST Sunset
Fri -- 08:13 PM HST Moonset
Fri -- 10:55 PM HST 0.31 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
Click for Map
Fri -- 04:18 AM HST 1.09 feet High Tide
Fri -- 05:43 AM HST Sunrise
Fri -- 06:49 AM HST Moonrise
Fri -- 09:55 AM HST -0.30 feet Low Tide
Fri -- 05:07 PM HST 2.79 feet High Tide
Fri -- 06:57 PM HST Sunset
Fri -- 08:17 PM HST Moonset
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 (20,4,5,8)(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.