Tuesday, October19, 2021
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Marine Weather and Tides
Princeville, HI

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:28AMSunset 6:05PM Tuesday October 19, 2021 11:50 AM HST (21:50 UTC) Moonrise 6:00PMMoonset 5:52AM Illumination 99% Phase: Waxing Gibbous; Moon at 14 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- 1003 Am Hst Tue Oct 19 2021
Rest of today..Northeast winds 10 knots. Wind waves 3 feet. Isolated showers late in the morning.
Tonight..Northeast winds 10 knots. Wind waves 3 feet. North swell 3 feet. Isolated showers after midnight.
Wednesday..North winds 10 knots. Wind waves 3 feet. North swell 5 feet. Isolated showers through the day.
Wednesday night..Northeast winds 10 knots. Wind waves 3 feet. North swell 5 feet. Isolated showers in the evening, then scattered showers after midnight.
Thursday..East winds 10 knots. Wind waves 2 feet or less. North swell 5 feet. Scattered showers.
Thursday night..East winds 10 knots. Wind waves 2 feet or less then 3 feet after midnight. North swell 5 feet. Scattered showers.
Friday..East winds 15 knots. Wind waves 5 feet. North swell 6 to 7 feet. Scattered showers.
Saturday..East winds 15 knots. Wind waves 5 to 6 feet. North swell 5 to 7 feet. Scattered showers.
PHZ100 1003 Am Hst Tue Oct 19 2021
Synopsis for hawaiian coastal waters.. Gentle to moderate breezy trades are expected the next couple of days. The remnant moisture from an old frontal boundary with move over the area Wednesday night throught Friday. High pressure rebuilds north of the islands Thursday and this will bring the return of strong trades by Friday.


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 191955 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 955 AM HST Tue Oct 19 2021

SYNOPSIS. A ridge of high pressure approaching the islands will make for gentle trades the next couple of days. A dry and stable airmass will give lots of sunshine and relatively few showers to the Aloha State. The remnants of an old front will reach Kauai Thursday, and might also spread to Oahu Thursday night or Friday, bringing an increase in clouds and some showers. Trades will start to increase Thursday and become breezy over the weekend. A dry and stable airmass will also return this weekend with fine weather expected.

DISCUSSION. No surprises in store for this morning, with no changes to the forecast, and few changes anticipated with the afternoon package.

The short term forecast remains relative dry, with weakening winds. Expect fewer showers than normal through Wednesday with the dry and stable airmass overhead. Tonight, dewpoints are expected to drop the upper 50s to lower 60s, but start to rebound tomorrow night.

Few clouds and showers are over and upstream of the islands, so don't expect much in the way of cloud coverage today or tomorrow. Satellite shows the cloud band associated with a cold front north of the islands to be along 30N. It is this front that is pushing the ridge over the islands, leading to the weakening of our trade wind flow. Some areas could see land and sea breezes today, but more likely tomorrow, as the winds weaken. Even as the winds weaken, expect a background trade wind pattern.

The front is expected to fall apart as it sinks south and the parent low lifts to the north. Remnants of the front will likely impact the northern islands Thursday and Friday, around the same time as an upper level trough moves over head. The frontal remnants will boost the low level moisture, and the upper level feature will help to to provide some support for the possibility of some enhancement to the showers. That all being said, overall rainfall amounts are still expected to be fairly modest.

Beyond Friday, expect a new high to build in, allowing breezy trades to return with another round of drier and more stable airmass.

AVIATION. A ridge of high pressure continues to move towards the island chain from the north today, easing trade wind speeds across the state. Shower activity will be limited to north through east sections of the islands and adjacent waters throughout the forecast period. However, even this shower activity will be mostly isolated in nature given the increasing stability overhead. Although brief periods of transient low clouds are possible, VFR flight conditions are expected to prevail throughout the next 24 hours and beyond.

There are currently no AIRMETs in effect, and none are anticipated today or tonight.

MARINE. Moderate trades will be gradually trending down to generally light to gentle breezes the next couple of days as a series of North Pacific cold fronts weaken the ridge north of the islands. These fronts will cross the north offshore waters Wednesday and Thursday and are expected to dissipate before reaching the state. High pressure will re-establish itself north of the islands by Friday and this will strengthen weekend trades back into the moderate to locally strong category.

A moderate north-northwest swell will slowly fill in tonight and steadily build throughout the day Wednesday. This swell will likely peak Wednesday night and gradually decline on Thursday. A reinforcing north swell is expected to fill in Thursday night and peak on Friday. Both of these swells could get near the High Surf Advisory threshold during its peak. With the swells being out of the northerly direction, harbor surges are expected over the Kahului and Hilo harbors especially on Friday due to an increase in swell height (6 to 8 feet) and a decrease in swell period (12-13 seconds). Swell direction will also be directly out of the north (010 degrees).

Surf along south facing shores should see a small increase as a new south-southwest swell fills in further this afternoon and Wednesday. Surf along east facing shores could see some wrap from the pair of northerly swells over the next several days. Otherwise, trade wind swell will be on the increase Friday into the weekend as the trades strengthen.

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . M Ballard AVIATION . Vaughan MARINE . Kino


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51208 7 mi85 min 79°F5 ft
NWWH1 - 1611400 - Nawiliwili, HI 20 mi51 min ENE 11G14 78°F 85°F1020.8 hPa (+0.7)
51201 - Waimea Bay, HI (106) 82 mi54 min 79°F4 ft
51WH0 - WHOTS - Woods Hole Ocean Time-series 95 mi81 min ENE 9.7 76°F 78°F1020 hPa65°F

Wind History for Nawiliwili, HI
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lihue, Lihue Airport, HI18 mi58 minNE 910.00 miA Few Clouds79°F68°F69%1020.4 hPa
Kekaha, Pacific Missile Test Facility Barking Sands, HI19 mi60 minW 510.00 miFair81°F63°F54%1019.9 hPa

Link to 5 minute data for PHLI

Wind History from HLI (wind in knots)
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Last 24hrNE11NE12NE11NE11NE12NE12NE14NE12NE12NE11NE11NE12E13NE10NE10E11NE12NE12NE14NE13NE11NE11NE11NE9
1 day agoE14E15NE14E14NE15E16NE14NE15NE13E13E15E16E14E15E13E14E13NE12NE13NE12E14E13E12NE13
2 days agoNE16NE14NE12E12E13NE13NE13NE17E18
G23
E13E14E13E13E13E13E14NE11NE14NE12E15E13E13
G21
E14E14

Tide / Current Tables for Hanalei Bay, Kauai Island, Hawaii
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Hanalei Bay
Click for Map
Tue -- 01:59 AM HST     1.79 feet High Tide
Tue -- 05:51 AM HST     Moonset
Tue -- 06:36 AM HST     Sunrise
Tue -- 07:44 AM HST     0.45 feet Low Tide
Tue -- 01:43 PM HST     1.53 feet High Tide
Tue -- 05:59 PM HST     Moonrise
Tue -- 06:09 PM HST     Sunset
Tue -- 07:32 PM HST     0.13 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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Tide / Current Tables for Hanamaulu Bay, Kauai Island, Hawaii
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Hanamaulu Bay
Click for Map
Tue -- 03:10 AM HST     1.69 feet High Tide
Tue -- 05:51 AM HST     Moonset
Tue -- 06:35 AM HST     Sunrise
Tue -- 09:10 AM HST     0.45 feet Low Tide
Tue -- 02:54 PM HST     1.43 feet High Tide
Tue -- 05:59 PM HST     Moonrise
Tue -- 06:08 PM HST     Sunset
Tue -- 08:58 PM HST     0.13 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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Weather Map
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GEOS Local Image of Hawaii    EDIT
NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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