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 6:30AM||Sunset 6:37PM||Saturday March 17, 2018 7:49 PM HST (05:49 UTC)||Moonrise 6:54AM||Moonset 7:08PM||Illumination 2%|
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|PHZ119 Maalaea Bay- 323 Pm Hst Sat Mar 17 2018 |
Tonight..North winds 15 knots. Wind waves 2 feet or less. Isolated showers after midnight.
Sunday..North winds 15 knots. Wind waves 2 feet or less. Scattered showers.
Sunday night..North winds 15 knots. Wind waves 2 feet or less. Scattered showers.
Monday..North winds 20 knots. Wind waves 2 feet or less. Isolated showers.
Monday night..North winds 15 knots. Wind waves 2 feet or less. Isolated showers.
Tuesday..North winds 15 knots. Wind waves 2 feet or less. Scattered showers.
Tuesday night..North winds 10 knots. Wind waves 2 feet or less. Haze. Isolated showers.
Wednesday..East winds 10 knots. Wind waves 2 feet or less. Haze. Scattered showers.
Thursday..East winds 10 knots becoming variable less than 10 knots. Wind waves 3 feet. Haze. Scattered showers.
|PHZ100 323 Pm Hst Sat Mar 17 2018 |
Synopsis for hawaiian coastal waters.. Trade winds will continue to fill in north to south tonight as a weak front pushes across the islands. The trades will continue through Tuesday before winds veer east southeast through the second half of the week as a front approaches and stalls west of kauai.
7 Day Forecast for Marine Location Near Lahaina, HIHourly EDIT Help
Area Discussion for -  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxhw60 phfo 180138|
area forecast discussion
national weather service honolulu hi
338 pm hst Sat mar 17 2018
Trade winds will spread westward across the island chain
beginning tonight. A moisture band will pass southward across the
islands tonight and Sunday, ushering in a slight increase in
showers and sky cover. An approaching front will stall west of
kauai by midweek, causing local winds to veer a bit to
southeasterlies and re-introducing the possibility of wet weather
for the second half of the work week.
Light to moderate trade winds across far eastern waters will
spread westward overnight. Models show that weak low pressure
near 30n150w, northeast of the main hawaiian islands, will move to
the east tonight through early next week, allowing trade flow
induced by high pressure far to our north to spread westward
across the chain. The cloud cover and light showers which formed
this afternoon across mauka areas should decrease as the trades
spread westward this evening.
Gfs depicts a narrow but distinct band of moisture moving
southward across the islands tonight and Sunday, likely an old
frontal remnant. In contrast, ECMWF shows a much less distinct
feature moving across the chain. Our forecast follows GFS but,
either way, the increase in trade flow mentioned above will be
most noticeable as this moisture band passes by. We also expect
increased associated shower activity overnight and Sunday.
A front expected to stall just west of kauai will cause winds to
veer to southeasterlies near kauai beginning Tuesday, while
moderate trades continue elsewhere. GFS and ECMWF are in rather
close agreement concerning the timing of this front's movement,
with both stalling it 300 to 500 miles west of kauai by midweek.
Moisture brought northward by the southeasterlies expected near
kauai may increase rainfall across the western islands during the
second half of the coming work week. ECMWF wants to push the front
across kauai this weekend while GFS keeps it stalled just west of
kauai. While this difference would affect the local day 6 and 7
wind forecast, both scenarios paint a wet picture for next
Saturday and Sunday. We will stick with GFS for now, maintaining|
trades or prefrontal southeasterlies through the forecast period
instead of long range postfrontal northerlies.
High pressure well to the north of the state will keep a light to
moderate trade wind flow in place through Sunday. A band of
clouds and showers will shift southward into the island chain
tonight and Sunday, bringing an increase in low clouds and
showers, particularly to windward areas.
No airmets are currently in effect. Airmet sierra may be needed
for windward sections of kauai later this evening.
No marine warnings or advisories are in effect for the next couple
of days. Light winds will give way to moderate trades tonight,
which will persist through Tuesday. Winds may approach small craft
advisory (sca) levels in the windy zones around maui county and
the big island around Tuesday or Wednesday. Winds will begin to
shift out of the east southeast late Tuesday through the second
half of the upcoming week as a front approaches from the west and
stalls west of kauai. The front may bring a period of wet weather
during the second half of the week and next weekend.
The current northwest will fade tonight with a more northerly
swell short period swell filling in on Sunday. Small long period
south swells should provide above null surf for the south facing
shores over the next few days. Surf heights will remain below
advisory levels on all shores over the next several days.
A broad low is forecast to develop and move into the northeast
pacific late this weekend and direct a large swath of gale force
winds towards the islands. 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||11 mi||50 min||NNE 8 G 12||75°F||78°F||1014.7 hPa (+1.3)|
|51205||17 mi||50 min||76°F||5 ft|
|51202 - Mokapu Point, HI (098)||65 mi||46 min||75°F||4 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
|Lahaina - West Maui, HI||10 mi||2.1 hrs||N 14||10.00 mi||Partly Cloudy||77°F||71°F||83%||1013.9 hPa|
|Kahului, Kahului Airport, HI||13 mi||56 min||NNE 12||10.00 mi||Partly Cloudy||75°F||71°F||88%||1015.2 hPa|
|Lanai City, Lanai Airport, HI||16 mi||54 min||NE 8||10.00 mi||Partly Cloudy||70°F||64°F||84%||1014.6 hPa|
Wind History from HJH (wind in knots)
|1 day ago||SE||E||Calm||NW||W||NW||NW||W||W||Calm|
|2 days ago||SE||Calm||Calm||NW||NW||NW||NW||N||N||N||N||NW |
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
Click for Map
Sun -- 04:04 AM HST 1.78 feet High Tide
Sun -- 06:32 AM HST Sunrise
Sun -- 07:33 AM HST Moonrise
Sun -- 10:19 AM HST 0.03 feet Low Tide
Sun -- 04:35 PM HST 1.65 feet High Tide
Sun -- 06:37 PM HST Sunset
Sun -- 08:02 PM HST Moonset
Sun -- 10:32 PM HST 0.20 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
Click for Map
Sun -- 03:03 AM HST 2.18 feet High Tide
Sun -- 06:31 AM HST Sunrise
Sun -- 07:32 AM HST Moonrise
Sun -- 09:19 AM HST -0.01 feet Low Tide
Sun -- 03:22 PM HST 1.90 feet High Tide
Sun -- 06:36 PM HST Sunset
Sun -- 08:01 PM HST Moonset
Sun -- 09:20 PM HST 0.10 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.
Link to Loop
Other links: Northern Pacific Contential US Full GOES-East
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.