Thursday, October1, 2020
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Marine Weather and Tides
Princeville, HI

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 6:22AMSunset 6:20PM Thursday October 1, 2020 1:11 PM HST (23:11 UTC) Moonrise 6:47PMMoonset 6:23AM Illumination 100% Phase: Full Moon; Moon at 15 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- 946 Am Hst Thu Oct 1 2020
Rest of today..Winds variable less than 10 knots. Wind waves 2 feet or less. North swell 6 feet. Isolated showers.
Tonight..Winds variable less than 10 knots. Wind waves 2 feet or less. North swell 8 feet. Isolated showers through the night.
Friday..Winds variable less than 10 knots. Wind waves 2 feet or less. North swell 8 feet. Isolated showers through the day.
Friday night..Winds variable less than 10 knots. Wind waves 2 feet or less. North swell 6 feet. Isolated showers in the evening, then scattered showers after midnight.
Saturday..East winds 10 knots. Wind waves 2 feet or less. North swell 6 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Saturday night..East winds 10 knots. Wind waves 2 feet or less. North swell 5 feet. Isolated showers.
Sunday..East winds 10 knots. Wind waves 3 to 5 feet. North swell 4 to 5 feet. Isolated showers.
Monday..East winds 10 knots. Wind waves 7 feet. Northwest swell 3 to 4 feet. Isolated showers.
PHZ100 946 Am Hst Thu Oct 1 2020
Synopsis for hawaiian coastal waters.. A nearly stationary front to the northwest of the islands along with a southeastern trough will maintain light to gentle trades through Friday. This trough will keep the chance for isolated showers and storms around and focused south and west of maui and the big island the next couple of days. More moderate trade flow is forecast this weekend.


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 011958 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 958 AM HST Thu Oct 1 2020

SYNOPSIS. Winds will remain light through Saturday as a weak trough of low pressures passes from east to west across the area. Scattered showers and isolated thunderstorms are expected over the Big Island with a few interior and mauka showers expected elsewhere. A more typical trade wind weather pattern will return on Sunday and linger for a few days. Clouds and passing showers will tend to favor windward and mauka areas. Winds will become light once again around Wednesday as a front approaches from the northwest.

DISCUSSION. A north thru south oriented low level trough along with its high precipitable water values is seen moving into the east side of the Big Island. Radar imagery is showing scattered showers and thunderstorms falling over portions of the Hilo and Puna districts. This feature along with daytime heating should allow for more widespread coverage of showers and thunderstorms this afternoon and evening. The remainder of the state will likely see some afternoon clouds build up with some showers possible mainly over interior locations.

The low level trough is forecast to move slowly westward over the next couple of days. Winds will be light through Saturday with daytime seabreezes and nighttime land breezes dominating. This should allow for modest clearing overnight with clouds and showers expected to develop during the day Friday. Abundant moisture along with daytime heating should allow for a slight chance of thunderstorms once again mainly over the leeward Big Island slopes on Friday. The trough and its associated moisture field will be west of the area by Saturday with a drier weather pattern expected.

High pressure will be building in back to our north on Sunday. This will allow for light to moderate trade winds to make a return but some sheltered locations will continue to experience daytime sea breezes and nighttime land breezes. Passing light showers are expected to favor windward and mauka areas.

By Wednesday, a frontal system will be approaching the area from the northwest. This will once again cause our winds to drop off. The airmass is expected to remain dry so just a few showers are expected mainly over interior areas during the afternoon hours.

AVIATION. A weak surface trough currently sits in the vicinity of Maui. It is noted as a patch of low clouds lingering around Maui, with a patch of low clouds lingering there. Another, stronger surface trough is closing in on the Big Island from the east and southeast. An area of convection is currently over the Puna and Hilo districts, with some heavy showers and a few thunderstorms.

These two troughs are forecast to merge this afternoon, spreading the showers westward in the process. A slight chance of thunderstorms remains for the Big Island today, including the adjacent waters. There is a good possibility of AIRMET Sierra for the east facing slopes of the Big Island later this morning and this afternoon. In the afternoon, scattered showers and a thunderstorm or two, as well as showers expanding westward to Maui could require expansion of AIRMET Sierra to those areas as well. Expect scattered showers to spread to Oahu later this evening.

Otherwise, generally light winds will allow for development of afternoon sea breezes (interior clouds) and nighttime land breezes (clearing inland), especially over the western end of the state.

MARINE. The passage of a northern Pacific cold front today will maintain currently light to gentle easterlies through Friday. Late week high pressure building in northeast of the islands will generate a tight enough pressure gradient back across the state to produce moderate trade flow. Greater areal coverage of moderate trades will persist through early next week with locally fresh trades possible through those traditionally windier channels and bays surrounding Maui County and waters south of the Big Island this weekend.

The eastern approach and western passage of a surface trough through tomorrow will keep rain chances and thunderstorm probabilities higher over over those waters to the south and southwest of the smaller islands and waters surrounding the Big Island Friday through Saturday.

The current north to northwest swell will slightly drop off today with a larger north to northwest swell arriving tomorrow. This next swell is expected to push surf to (or near) advisory levels tomorrow along the northern shores of the smaller islands. Swell direction looks to be just north enough for island shadowing to keep most west-facing shores below advisory levels. The exception would be Kauai where west facing shores will be more exposed to this north swell. Surf will gradually lower Friday night through early next week.

Surf along south-facing shores will trend lower through the rest of the week. A late season south swell is expected early next week that will likely boost surf above seasonal averages Monday through the middle of next week.

Surf along east-facing shores will be primarily driven from wrap around associated with a series of north to northwest swells moving through the islands this weekend. East shore surf may substantially increase Sunday night through early next week as a long period east swell associated with eastern Pacific tropical cyclone Maria moves through. This could result in surf reaching advisory levels along most east-facing shores Monday through the middle of next week.

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . Burke AVIATION . TS MARINE . Blood


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NWWH1 - 1611400 - Nawiliwili, HI 20 mi54 min E 7 G 11 81°F 86°F1013.5 hPa
51201 - Waimea Bay, HI (106) 82 mi65 min 81°F6 ft
51WH0 - WHOTS - Woods Hole Ocean Time-series 87 mi102 min 80°F 83°F1013.5 hPa71°F

Wind History for Nawiliwili, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lihue, Lihue Airport, HI18 mi19 minENE 810.00 miFair86°F71°F61%1012.7 hPa
Kekaha, Pacific Missile Test Facility Barking Sands, HI19 mi16 minNNW 1010.00 miFair85°F69°F59%1012.4 hPa

Link to 5 minute data for PHLI

Wind History from HLI (wind in knots)
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Last 24hrE7E6E5NE3NE6W4W5W6W8W7W8W8W8W7W8W8W8W8W7NE4NE7NE9NE9E8
1 day agoNE9E6E6NE8NE7N6NW3W5W8W6W7W9W8W8W8W5W7W7W7N6E7E7E7E7
2 days agoE8E6E5E6NE6NE5NE6N5NW4NW3NW5NW4NW4W6W8W6W7W9W7N64NE6NE6NE8

Tide / Current Tables for Hanalei Bay, Kauai Island, Hawaii
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Hanalei Bay
Click for Map
Thu -- 02:21 AM HST     1.62 feet High Tide
Thu -- 06:23 AM HST     Moonset
Thu -- 06:29 AM HST     Sunrise
Thu -- 07:56 AM HST     0.40 feet Low Tide
Thu -- 11:06 AM HST     Full Moon
Thu -- 02:20 PM HST     1.72 feet High Tide
Thu -- 06:24 PM HST     Sunset
Thu -- 06:46 PM HST     Moonrise
Thu -- 08:16 PM HST     0.26 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.21.51.61.61.41.10.70.50.40.50.711.31.61.71.71.51.10.70.40.30.30.50.8

Tide / Current Tables for Hanamaulu Bay, Kauai Island, Hawaii
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Hanamaulu Bay
Click for Map
Thu -- 03:32 AM HST     1.52 feet High Tide
Thu -- 06:23 AM HST     Moonset
Thu -- 06:28 AM HST     Sunrise
Thu -- 09:22 AM HST     0.40 feet Low Tide
Thu -- 11:06 AM HST     Full Moon
Thu -- 03:31 PM HST     1.62 feet High Tide
Thu -- 06:24 PM HST     Sunset
Thu -- 06:45 PM HST     Moonrise
Thu -- 09:42 PM HST     0.26 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.71.11.31.51.51.41.10.80.50.40.40.60.91.21.41.61.61.41.20.80.50.30.30.4

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
Ground Weather Radar Station Kauai, HI
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