Marine Weather and Tides
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.
|Sunrise 6:29AM||Sunset 6:37PM||Sunday March 18, 2018 1:17 PM HST (23:17 UTC)||Moonrise 7:33AM||Moonset 8:02PM||Illumination 5%|
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|PHZ119 Maalaea Bay- 920 Am Hst Sun Mar 18 2018 |
Rest of today..North winds 15 knots. Wind waves 2 feet or less.
Tonight..North winds 15 knots. Wind waves 2 feet or less.
Monday..Northeast winds 15 knots. Wind waves 2 feet or less. Isolated showers.
Monday night..Northeast winds to 25 knots. Wind waves 2 feet or less. Isolated showers.
Tuesday..Northeast winds 20 knots. Wind waves 2 feet or less. Isolated showers in the morning.
Tuesday night..Northeast winds to 25 knots. Wind waves 2 feet or less.
Wednesday..Northeast winds to 25 knots becoming east 10 knots. Wind waves 2 feet or less.
Thursday..East winds 10 knots becoming variable less than 10 knots. Wind waves 2 feet or less. Isolated showers.
|PHZ100 920 Am Hst Sun Mar 18 2018 |
Synopsis for hawaiian coastal waters.. Trade winds will continue to fill in as a weak front pushes through the islands. The trades will then persist through the rest of the forecast period.
7 Day Forecast for Marine Location Near Makena, HIHourly EDIT Help
Area Discussion for -  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxhw60 phfo 181949|
area forecast discussion
national weather service honolulu hi
949 am hst Sun mar 18 2018
High pressure will strengthen far to the north of the state over
the next couple days, allowing the light to moderate trades today
to increase to locally breezy levels by Tuesday and Wednesday. The
trades will ease Thursday through next weekend as a front
approaches from the west and slowly pushes eastward across the
island chain. A band of clouds and showers will move from north
to south through the islands today through Monday, keeping showery
weather in place in windward areas, with a stray shower reaching
leeward areas from time to time. Drier conditions are then
expected to overspread the entire state beginning Monday night and
continuing through Wednesday night. Rain chances should then be
on the increase late in the work week and over the upcoming
weekend as the weakening front shifts eastward through the
Currently at the surface, a 1035 mb high is centered around 1600
miles north-northwest of honolulu, with a 1002 mb low around 1150
miles west-northwest of kauai. Meanwhile, a weakening or
dissipating front is located between 500 and 600 miles west of
kauai. Satellite imagery shows a band of clouds and showers
stretching from well east of the islands, nearly due west and
through oahu and kauai. As a result, mostly cloudy skies are in
place across most of the state this morning, with some pockets of
lesser cloud coverage over the eastern islands. Radar imagery
shows scattered to numerous showers moving into windward areas of
the smaller islands, with more isolated shower activity over
windward big island. Main short term concern revolves around rain
chances over the next 24 to 36 hours as the band of clouds and
showers moves through the area.
Today through Monday night,
high pressure well north of the state will lift northward and
merge with another high lifting northwestward out of the western
pacific over the next couple of days, with the resultant high
reaching 1045 mb near the central aleutians by Tuesday morning. As
a result, the trade winds are expected to slowly strengthen from
light and locally moderate levels today, to moderate levels by
A band of clouds and showers will remain over the smaller islands
today, then push southward into the big island this evening. The
band of clouds appears to get hung up over the big island on
Monday, before shifting south of the state Monday night. There is
quite a bit of showery low cloud evident in satellite imagery, so
expect fairly showery weather to continue across windward areas of
the smaller islands today and tonight, with a stray shower
reaching leeward areas from time to time. There are some mixed
signals in the guidance for Monday, with the ECMWF drying things
out over the smaller islands, while the GFS shows a wave of
showers associated with shortwave trough moving through. Will keep
some showers in the forecast for all areas of the smaller islands
Monday to account for this possibility, then show drier conditions
building in Monday night. Across the big island, isolated showers
this morning should increase in coverage this afternoon into this
evening as sea breezes lead to daytime convective shower
development. Most showers should diminish this evening in leeward
areas, but a few isolated showers will be possible overnight
along the kona coastline. The brunt of the shower activity
however is expected over windward areas as the cloud and shower
band moves in. This band of clouds and showers will likely linger
over windward sections of the big island on Monday, before
shifting south of the state Monday night.
Tuesday through Wednesday night,
both the GFS and ECMWF are in good agreement showing the strong|
surface high over the aleutians weakening as it drops south-
southeastward and closer to the islands through the period. This
will result in a tightening of the pressure gradient, with
moderate to locally breezy trade winds expected across the state.
There is some disagreement however with respect to the eastward
extent of the deeper moisture associated with the front west of
the state. The GFS shows the deepest moisture remaining west of
the state while the ECMWF shows it extending eastward and over
kauai and perhaps as far east as oahu. Since this is the first run
that the ECMWF has shown this deeper moisture extending farther
east, will favor the drier GFS solutions until details become more
Thursday through next Sunday,
the latest GFS and ECMWF runs are in good agreement showing a
weakening front approaching the state from the west Thursday and
Friday, then slowly pushing eastward across the island chain over
the weekend. Kauai will remain in closest proximity to the front
and its associated deep moisture Thursday through Friday, so this
is where the best chances for rain are expected. Elsewhere, fairly
dry conditions are expected to continue through Friday. More
unsettled conditions are then expected Friday night and over the
weekend as the front and band of deep moisture shift eastward
across the island chain.
Surface high pressure building far north of the state will
maintain light to moderate trade winds through tonight. The
leading edge of a diffuse band of low clouds and showers extends
as far southeast as western maui late this morning. The clouds
and showers within this band will continue to spread southward
over the remainder of the smaller islands, before reaching the big
island this evening. These low clouds and showers will produce
periods of MVFR ceilings visibilities, particularly along north
and east facing slopes of most islands.
Airmet sierra remains in effect for mountain obscuration across
windward kauai... Oahu... Molokai... And maui. This airmet will
likely need to be extended to include windward big island this
evening as the band of low clouds and showers continues to shift
south across the state.
No marine warnings or advisories are expected for the next couple
of days. Moderate trades, which will persist through Tuesday, and may
approach small craft advisory (sca) levels in the windy zones
around maui county and the big island by Tuesday evening. Winds
will begin to shift out of the east southeast late Tuesday through
the second half of the week as a front approaches from the west
and stalls west of kauai. The front may also bring a period of
wet weather during the second half of the week and next weekend.
The current northwest swell will fade, with a more northerly
short period swell filling in today. Small, long-period south
swells will keep surf just above flat for south facing shores
over the next few days. Surf heights will remain below advisory
levels on all shores through the early part of this week.
A broad low in the northeast pacific will direct a large swath of
gale force winds towards the islands early this week. This should
translate to a building north-northeast swell late Tuesday, and
could bring advisory level surf to north and east facing shores
through at least Thursday, possibly longer for east facing shores.
Hfo watches warnings advisories
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|
|KLIH1 - 1615680 - Kahului Bay, Maui, HI||22 mi||48 min||N 13 G 18||72°F||79°F||1014.5 hPa|
|51205||30 mi||48 min||76°F||6 ft|
|51202 - Mokapu Point, HI (098)||80 mi||44 min||75°F||7 ft|
Wind History for Kahului, Kahului Harbor, HI(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Lanai City, Lanai Airport, HI||22 mi||22 min||NE 15 G 21||10.00 mi||A Few Clouds||75°F||66°F||74%||1013.2 hPa|
|Kahului, Kahului Airport, HI||23 mi||24 min||NE 12||6.00 mi||Light Rain Fog/Mist||75°F||73°F||94%||1014.6 hPa|
Wind History from HNY (wind in knots)
|1 day ago||S||S||S||SW||SW||Calm||Calm||Calm||Calm||NE||E||NE||E||E||NE||E||NE||N||E||NE||NE||SW||W||S|
|2 days ago||W||W||W||NW||NW||NW||Calm||N||Calm||N||E||E||E||E||S||Calm||S||NW||N||SE||S |
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Kuheia Bay |
Click for Map
Sun -- 04:27 AM HST 1.82 feet High Tide
Sun -- 06:32 AM HST Sunrise
Sun -- 07:33 AM HST Moonrise
Sun -- 10:48 AM HST -0.15 feet Low Tide
Sun -- 05:00 PM HST 1.65 feet High Tide
Sun -- 06:36 PM HST Sunset
Sun -- 08:02 PM HST Moonset
Sun -- 11:00 PM HST 0.05 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
Click for Map
Sun -- 04:44 AM HST 1.86 feet High Tide
Sun -- 06:31 AM HST Sunrise
Sun -- 07:32 AM HST Moonrise
Sun -- 10:49 AM HST -0.04 feet Low Tide
Sun -- 05:16 PM HST 1.73 feet High Tide
Sun -- 06:36 PM HST Sunset
Sun -- 08:01 PM HST Moonset
Sun -- 11:04 PM HST 0.14 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Weather Map and Satellite Images(on/off)  HelpWeather Map
GOES Local Image of Hawaii EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Wind Forecast for (19,4,5,8)(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.