Thursday, October21, 2021
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Marine Weather and Tides
Koloa, 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 6:29AMSunset 6:03PM Thursday October 21, 2021 11:18 AM HST (21:18 UTC) Moonrise 7:08PMMoonset 7:34AM Illumination 99% Phase: Waning Gibbous; Moon at 16 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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PHZ113 Kauai Channel- 944 Am Hst Thu Oct 21 2021
Rest of today..Northeast winds 15 knots. Wind waves 3 feet. North swell 4 feet. Isolated showers through the day.
Tonight..Northeast winds 20 knots. Wind waves 4 feet. North swell 4 feet. Scattered showers.
Friday..East winds 15 knots. Wind waves 4 feet. North swell 5 feet. Scattered showers.
Friday night..East winds 15 knots. Wind waves 4 feet. North swell 7 feet. Scattered showers in the evening, then isolated showers after midnight.
Saturday..East winds 15 knots. Wind waves 4 feet. North swell 6 feet. Isolated showers through the day.
Saturday night..East winds 20 knots. Wind waves 5 feet. North swell 5 feet. Isolated showers.
Sunday..Northeast winds 20 knots. Wind waves 5 to 6 feet. North swell 4 feet. Isolated showers.
Monday..Northeast winds 15 knots. Wind waves 5 feet. North swell 4 to 5 feet. Isolated showers.
PHZ100 944 Am Hst Thu Oct 21 2021
Synopsis for hawaiian coastal waters.. Trades will weaken to generally gentle breezes the next couple of days. A couple of fronts north of the islands will dissipate over the windward waters Wednesday and Thursday. High pressure rebuilds north of the islands Thursday and this will restrengthen late week trades.


7 Day Forecast for Marine Location Near Koloa, HI
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location: 21.9, -159.48     debug


Area Discussion for -
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FXHW60 PHFO 211950 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 950 AM HST Thu Oct 21 2021

SYNOPSIS. A band of low clouds and showers will bring scattered showers at times to the smaller islands through Friday, while the Big Island remains mostly dry. The smaller islands will dry out from east to west Friday night, while showers increase over windward Big Island. After a showery Saturday morning on the Big Island, a rather dry trade wind pattern will become established statewide Saturday afternoon and Saturday night. A more typical trade wind shower pattern is expected to return on Sunday and continue through the middle of next week. Trade winds will remain light today, then increase to moderate to breezy levels Friday through Monday. The trades will then trend downward Tuesday, and become light by the middle of next week.

DISCUSSION. Currently at the surface, the tail end of an old front is over Oahu and Kauai early this morning. Meanwhile, a weakening front is located around 300 miles north of Kauai, and a 1027 mb high is centered around 900 miles north of Honolulu. The pressure gradient remains very weak over the islands this morning, with a light background trade wind flow in place and land breezes present in many areas. Visible satellite imagery shows partly to mostly cloudy conditions over Kauai and Oahu, with clear to partly cloudy skies over the remainder of the state. Radar imagery shows a few showers affecting mainly windward sections of Kauai and Oahu, with rain free conditions elsewhere. Main short term concerns revolve around rain chances and trade wind trends during the next few days.

High pressure to the distant north will settle southward and closer to the islands during the next couple days, while the weakening front several hundred miles north of the state stalls out and gradually dissipates. At the same time, a weak trough of low pressure will approach and pass by to the south of the Big Island. As a result, we should see the light trade winds with localized sea breezes today, trend upward tonight, with moderate to locally breezy trades becoming established on Friday. Very little change in trade wind strength is then expected through Monday. As the ridge north of the state weakens and a front approaches from the northwest, we should see the trades gradually trend downward on Tuesday, with light to moderate trades forecast by the middle of next week.

As for the remaining weather details, the moisture associated with the old washed out front will linger in the vicinity of Oahu today, where scattered showers can be expected during the afternoon hours in both windward and leeward areas. A slightly drier airmass is in place just northeast of Kauai, so we should see shower cover decrease here this afternoon. Meanwhile, dry conditions should persist over Maui County and the Big Island, although a few daytime heating driven showers are not out of the question.

With the strengthening trade winds returning tonight and Friday, we should see the old frontal remnants get disbursed a bit more evenly across the smaller islands, bringing a more typical windward/mauka focused shower pattern to these areas. Drier conditions will prevail over the Big Island, which should remain to the south of this moisture band. Friday night the lingering moisture associated with the old front will lift northward, bringing a decrease in shower activity from east to west across the smaller islands as the night progresses. Meanwhile, a new incoming area of moisture will slide into the Big Island, bringing some wet weather to windward areas here. This wet weather will linger over the Big Island Saturday morning, with rather dry trade wind weather expected statewide Saturday afternoon. This dry trade wind pattern will then continue Saturday night, followed by a more typical trade wind shower pattern returning Sunday through the middle of next week.

AVIATION. Frontal remnants will push towards Oahu and Kauai from the east northeast today. This will allow for enhanced showers and clouds on the windward portions of these aforementioned islands. Isolated -SHRA expected along windward portions of all remaining islands. Weak to occasionally moderate trade flow will persist through this afternoon, then gradually strengthen overnight.

AIRMET SIERRA remains in effect for Oahu above 2500 ft for tempo mountain obscuration due to clouds and showers.

MARINE. A frontal boundary will stall and dissipate just north of the area tonight and Friday. A new high will build in north of the area which will result in an uptick in trade winds. A Small Craft Advisory will likely be required as early as Friday morning for the typically windy waters around Maui County and the Big Island. These conditions are then expected to continue through the weekend and on into early next week.

The current north swell will continue to lower today and tonight only to be reinforced by a new north swell Friday through Saturday. Surf heights with this new swell are expected to peak just below advisory levels. Due to the size and direction of the swell, there is the potential for moderate harbor surges in the Kahului and Hilo harbors. East facing shores with northerly exposure will also see elevated surf from this new swell. During the Sunday through Wednesday time period, a series of small north and north northwest swells can be expected. Small, mainly background south and southeast swells are expected through Monday with a slightly larger south swell expected to fill in Tuesday and Wednesday. Trade winds will continue to produce short period choppy surf along east facing shores through the weekend with a slight downward trend expected into the middle of next week as trade wind speeds decrease.

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . Jelsema AVIATION . Thomas MARINE . Burke


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NWWH1 - 1611400 - Nawiliwili, HI 8 mi48 min NE 8G13 78°F 85°F1019.4 hPa
51208 27 mi52 min 79°F6 ft
51201 - Waimea Bay, HI (106) 74 mi51 min 79°F6 ft

Wind History for Nawiliwili, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lihue, Lihue Airport, HI9 mi25 minNE 1110.00 miA Few Clouds80°F69°F69%1018.8 hPa
Kekaha, Pacific Missile Test Facility Barking Sands, HI20 mi27 minWSW 610.00 miA Few Clouds82°F68°F63%1018.3 hPa

Link to 5 minute data for PHLI

Wind History from HLI (wind in knots)
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Last 24hrNE13NE13NE16NE16NE14NE13N13N5N4N3NW3N12NW5NW4NW5N7W5NW4W8W6NW3NE10NE10NE11
1 day agoNE11NE12NE13NE10NE12NE13NE10NE11N8N7NW4NW4W5W6W5NW5W5W7NW5NW5N5N9NE12NE11
2 days agoNE11NE12NE11NE11NE12NE12NE14NE12NE12NE11NE11NE12E13NE10NE10E11NE12NE12NE14NE13NE11NE11NE11NE9

Tide / Current Tables for Port Allen, Hanapepe Bay, Kauai Island, Hawaii
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Port Allen
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Thu -- 03:53 AM HST     1.71 feet High Tide
Thu -- 06:37 AM HST     Sunrise
Thu -- 07:34 AM HST     Moonset
Thu -- 10:40 AM HST     0.41 feet Low Tide
Thu -- 03:34 PM HST     1.02 feet High Tide
Thu -- 06:08 PM HST     Sunset
Thu -- 07:08 PM HST     Moonrise
Thu -- 09:37 PM HST     0.14 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 Nawiliwili, Hawaii (2)
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Nawiliwili
Click for Map
Thu -- 04:02 AM HST     1.91 feet High Tide
Thu -- 06:36 AM HST     Sunrise
Thu -- 07:33 AM HST     Moonset
Thu -- 10:37 AM HST     0.48 feet Low Tide
Thu -- 03:43 PM HST     1.10 feet High Tide
Thu -- 06:07 PM HST     Sunset
Thu -- 07:07 PM HST     Moonrise
Thu -- 09:34 PM HST     0.17 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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