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Marine Weather and Tides
Princeville, HI

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:24AMSunset 6:48PM Tuesday March 31, 2020 11:05 PM HST (09:05 UTC) Moonrise 11:42AMMoonset 12:38AM Illumination 58% Phase: Waxing Gibbous; Moon at 8 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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PHZ111 Kauai Windward Waters- 955 Pm Hst Tue Mar 31 2020
Rest of tonight..East winds 10 knots. Wind waves 3 feet. Mixed swell northwest 3 feet and east 4 feet. Slight chance of showers.
Wednesday..Northeast winds 10 knots. Wind waves 3 feet. Mixed swell northwest 3 feet and east 4 feet. Slight chance of showers in the morning, then chance of showers in the afternoon.
Wednesday night..East winds 10 knots. Wind waves 3 feet. Mixed swell northwest 3 feet and east 4 feet. Slight chance of showers in the evening, then chance of showers after midnight.
Thursday..Southeast winds 10 knots. Wind waves 2 feet or less. Mixed swell northwest 3 feet and east 4 feet. Chance of showers.
Thursday night..Southeast winds 10 knots. Wind waves 2 feet or less. Mixed swell northwest 3 feet and east 4 feet. Chance of showers.
Friday..Southeast winds 10 knots. Wind waves 2 feet or less. SWell east 3 to 4 feet. Chance of showers.
Friday night..South winds 10 knots. Wind waves 2 feet or less then 3 feet after midnight. Mixed swell northwest 3 feet and east 4 feet. Chance of showers.
Saturday..Southeast winds 10 knots. Wind waves 3 feet. Mixed swell northwest 4 to 6 feet and east 4 feet. Chance of showers.
Sunday..South winds 10 knots. Wind waves 3 to 4 feet. Mixed swell northwest 4 to 6 feet and east 3 to 4 feet. Scattered showers.
PHZ100 955 Pm Hst Tue Mar 31 2020
Synopsis for hawaiian coastal waters.. A high far northeast of the area and a weak trough over the eastern offshore waters will maintain gentle to locally fresh east winds though tomorrow. Winds will veer out of the southeast starting Thursday as a front approaches from the northwest.


7 Day Forecast for Marine Location Near Princeville, HI
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location: 22.22, -159.48     debug


Area Discussion for -
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FXHW60 PHFO 010734 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 934 PM HST Tue Mar 31 2020

SYNOPSIS. The light trade winds will be becoming southeast by Thursday, then light south and southeast on Friday, continuing into the weekend as a front approaches the islands from the west. Expect the weather to become more unstable over the weekend as the front gets support from an upper level low forecast to settle in northwest of the islands.

DISCUSSION.

Changes have been made to the evening forecast package, as a eastward advancing short wave moves through the main Hawaiian Islands. This shortwave is currently over Molokai, and is expected to clear the Big Island mid Wednesday morning, taking most of the dense mid and high clouds away with it.

Meanwhile, the trade winds will easing, becoming light over the western islands overnight, while trades will be a tad stronger over on the Big Island. This diminishing trend opens the door for a sea breeze/ land breeze regime to settle in. Although the shortwave would be east of the Big Island Wednesday morning, there will still be enough instability, where combined with daytime heating, light winds, and ample moisture, result in some scattered afternoon showers and a slight chance of a thunderstorm, especially over the interior and lee areas of the smaller islands. Both the ECMWF AND GFS are in fair agreement with this scenario, although they are both drier. We will see how things pan out Wednesday morning, but there is a hint, where there could be less showers and thunderstorm Wednesday afternoon.

The trades will then be turning southeast Thursday, in response to a advancing front from the northwest and an upper level low setting up shop 880 miles northwest of Kauai Friday evening. This southeast flow continues into the weekend, and becomes wetter each day as instability increases. The upper low may be pulling some tropical moisture toward the islands late in the weekend.

The models disagree at the moment as to when the front arrives. The latest ECMWF is faster with it, having it over Kauai Monday morning. The GFS is slower by about 24 hours. But before the front's arrival, there could be plenty of showers around. Stay tune.

In the mean time, skies have cleared Kauai, while Oahu and Maui counties, continue to thin out. There does not appear to be much trade wind showers. But if there is any, the developing land breeze will minimize them moving ashore. Overnight lows will likely be a couple of degrees cooler as the land radiates out due to the lack of cloud cover, such as Kauai.

AVIATION . An upper level trough passing over the eastern half of the state will give Maui a chance for a few showers, but the main chance for rain tonight will be for the Big Island. For the Big island, any threat of thunderstorm ends by midnight, but the scattered showers for the windward areas remains. Leeward Big Island will be dry.

AIRMET Sierra is in effect for mountain obscuration on the windward side of the Big Island but ceilings have lifted quite a bit and should be able to cancel that AIRMET soon. Will keep AIRMET Zulu in place for light IC icing until the thick cloud layer dissipates later tonight.

Light trade winds are expected through the rest of the forecast period. The light trades will promote daytime sea breezes that might trigger a few inland showers.

MARINE . A surface high far northeast of the area is maintaining easterly trade winds across Hawaiian waters, but a trough over the eastern offshore waters will keep the winds gentle to locally fresh though tomorrow. A trough aloft moving east across the area is making the atmosphere unstable, so there will be a chance of thunderstorms over the eastern offshore waters and over the coastal waters east of Molokai through tonight. As the trough moves away to the east tomorrow, the chance of thunderstorms will subside.

A surface low south of the Aleutians is forecast to move south for the next couple of days. As the low approaches, winds will veer out of the southeast starting Thursday. Winds will weaken over the western part of the coastal and offshore waters but winds may strengthen over eastern waters, especially where the southeast flow accelerates around the Big Island and Maui. A front or convergence band associated with the low will likely move over the northwest offshore waters Saturday and could produce strengthening south winds over the western waters and bring a chance of more thunderstorms.

The current small northwest swell will slowly subside through Friday night. A new northwest swell building Saturday will produce moderate surf along north and west facing shores over the weekend, but surf is expected to remain well below the advisory threshold. Swells from the southern hemisphere will maintain small surf along south facing shores through tomorrow. Swells from the distant southeast Pacific will be partly blocked by the islands of French Polynesia but will produce small surf through the rest of the week. Surf along east facing shores will remain up through midweek due to an upstream fetch, despite the trades relaxing locally. Surf will subside by the end of the week as the upstream fetch weakens.

HFO WATCHES/WARNINGS/ADVISORIES. None.



H Lau/Chevalier/Donaldson


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51208 7 mi35 min 76°F6 ft
NWWH1 - 1611400 - Nawiliwili, HI 20 mi65 min S 1.9 G 4.1 70°F 78°F1018.1 hPa
51201 - Waimea Bay, HI (106) 82 mi35 min 76°F4 ft
51WH0 - WHOTS - Woods Hole Ocean Time-series 87 mi95 min ENE 12 74°F1017.4 hPa

Wind History for Nawiliwili, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lihue, Lihue Airport, HI18 mi72 minNE 1110.00 miPartly Cloudy74°F66°F79%1017.8 hPa
Kekaha, Pacific Missile Test Facility Barking Sands, HI19 mi69 minENE 310.00 miFair70°F61°F73%1017.3 hPa

Link to 5 minute data for PHLI

Wind History from HLI (wind in knots)
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Last 24hrNE10E14E13E12E14E10NE9NE9E9NE11NE9NE12NE12NE9NE11NE12NE13E13NE10NE9NE10NE11NE11NE11
1 day agoE14E13E13E13E14E14E12E13E16E14E13E14E15E12E12E13E13E11E12NE11NE12NE11E12E12
2 days agoE15E15NE18E18NE15E15E14E17E17E14E13NE14NE11E14NE13NE13E15NE14NE15E17NE15NE12E13E13

Tide / Current Tables for Hanalei Bay, Kauai Island, Hawaii
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Hanalei Bay
Click for Map
Wed -- 12:21 AM HST     First Quarter
Wed -- 01:33 AM HST     Moonset
Wed -- 04:59 AM HST     0.23 feet Low Tide
Wed -- 06:29 AM HST     Sunrise
Wed -- 09:43 AM HST     0.44 feet High Tide
Wed -- 12:37 PM HST     Moonrise
Wed -- 01:55 PM HST     0.20 feet Low Tide
Wed -- 06:53 PM HST     Sunset
Wed -- 10:12 PM HST     1.75 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.20.90.60.40.30.20.30.30.40.40.40.40.30.20.20.20.40.60.91.21.51.71.81.7

Tide / Current Tables for Hanamaulu Bay, Kauai Island, Hawaii
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Hanamaulu Bay
Click for Map
Wed -- 12:21 AM HST     First Quarter
Wed -- 01:32 AM HST     Moonset
Wed -- 06:25 AM HST     0.23 feet Low Tide
Wed -- 06:29 AM HST     Sunrise
Wed -- 10:54 AM HST     0.34 feet High Tide
Wed -- 12:37 PM HST     Moonrise
Wed -- 03:21 PM HST     0.20 feet Low Tide
Wed -- 06:52 PM HST     Sunset
Wed -- 11:23 PM HST     1.65 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.41.20.90.70.50.30.20.20.30.30.30.30.30.30.20.20.20.30.50.711.31.51.6

Weather Map
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wmap_P
GEOS 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 (5,6,7,8)
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Ground Weather Radar Station Kauai, HI
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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 numerous 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.