Tuesday, October20, 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 6:29AMSunset 6:04PM Tuesday October 20, 2020 2:09 AM HST (12:09 UTC) Moonrise 10:55AMMoonset 9:57PM Illumination 14% Phase: Waxing Crescent; Moon at 4 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 Pm Hst Mon Oct 19 2020
Rest of tonight..South winds 10 knots. Wind waves 3 feet. Northwest swell 3 feet and northeast 3 feet. Showers likely.
Tuesday..South winds 10 knots. Wind waves 3 feet in the morning then 2 feet or less. Mixed swell northwest 3 feet and northeast 3 feet. Showers likely in the morning, then scattered showers in the afternoon.
Tuesday night..Winds variable less than 10 knots becoming south 10 knots after midnight. Wind waves 2 feet or less. Mixed swell northwest 3 feet and northeast 3 feet. Scattered showers.
Wednesday..Winds variable less than 10 knots. Wind waves 2 feet or less. Mixed swell northwest 3 feet and northeast 3 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Wednesday night..East winds 10 knots. Wind waves 2 feet or less. SWell northeast 3 feet. Isolated showers.
Thursday..Southeast winds 10 knots in the morning becoming variable less than 10 knots. Wind waves 2 feet or less. SWell northeast 3 feet. Slight chance of showers.
Thursday night..Winds variable less than 10 knots. Wind waves 2 feet or less. SWell northeast 3 feet. Slight chance of showers.
Friday..Winds variable less than 10 knots. Wind waves 2 feet or less. Slight chance of showers.
Saturday..Winds variable less than 10 knots. Wind waves 2 feet or less. Northwest swell 3 to 5 feet. Slight chance of showers.
PHZ100 946 Pm Hst Mon Oct 19 2020
Synopsis for hawaiian coastal waters.. A stalled front near kauai will gradually wash out through the middle of the week. A surface ridge will remain across the eastern islands and then lift northward with the dissipating front.


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 200701 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 901 PM HST Mon Oct 19 2020

SYNOPSIS. A stationary cold front near Kauai will continue to weaken over the next few days keeping light and variable winds in the forecast across Hawaii Nei. Enhanced clouds and periods of showers will continue to affect Kauai County and Oahu through at least the first half of this week. More stable conditions with less shower activity is forecast over Maui and Hawaii Counties under a weak ridge aloft. On-shore sea breezes will develop a few hours after sunrise with off-shore land breezes taking over around sunset. These light and variable winds will continue through the week under a troughing pattern north of the state.

DISCUSSION. Tonight's satellite loop shows a low pressure system far to the northwest of the island chain with a trailing stationary cold front producing periods of showers near Kauai. Southerly wind flow ahead of this front will bring up additional showers into the southern and western slopes of Oahu for the next few days. Local scale radar imagery shows between a quarter and a half inch of rain falling from the stronger rain bands as they move over Kauai, Niihau and Oahu. The highest 3 hour rainfall observation reports as of 7PM HST on Oahu show 0.52 inch total in Palolo and 0.72 inch total for Palehua (just north of Makakilo). Periods of rainfall will continue through the early morning hours across the western islands with showers moving up from the south.

The latest forecast guidance shows the stationary cold front weakening near Kauai over the next few days. However, weak southerly flow will continue to pull up unstable shower bands moving from south to north over the islands of Kauai, Niihau and Oahu through at least Wednesday. More stable air spreads westward to Oahu on Thursday and Friday, with continued periods of showers for the Garden Isle of Kauai. By the weekend another passing front far to the north of the state will pull the remnants of this low pressure system northward away from the islands. This change in the pressure pattern will allow a more stable southeasterly flow to return to much of the state with less rainfall activity.

Long range weather model solutions for this weekend continue to show some unsettled weather lingering over Kauai with drier and more stable trends for the rest of the state. These longer range rainfall predictions hinge on the location and position of a persistent trough forecast just northwest of the island chain. Small changes to this trough location may expand or contract the shower coverage over the Hawaiian Island chain, keeping forecaster confidence in the fair range. Stay tuned.

AVIATION. A nearly stationary, N-S oriented frontal boundary remains near Kauai, and moisture convergence E of this boundary continues to support shower development over Kauai and Oahu and adjacent waters. Some of the showers are locally heavy, and are producing periods of MVFR VIS/CIG. The shower coverage is sufficiently great to warrant AIRMET SIERRA for the S and W facing slopes of Kauai and Oahu, with showers generally moving from S to N in the moist S flow. A surface ridge will support a drier and more stable regime over Maui County and the Big Island, and VFR conditions will prevail. The expected exception is PHNY, where light winds will likely allow MVFR CIG to develop after 20Z.

MARINE. This afternoon's Tsunami Advisory was cancelled at 7 PM as wave heights are now below advisory levels. Small tsunami waves of up to a foot were observed at the local tidal observation sites.

A stalled boundary will lay across the western offshore waters the next few days. Generally light to gentle southwesterly to variable breezes along and west of this boundary . moderate southerlies east of the boundary where there will be more of an easterly component to the wind east of Maui, more specifically around the Big Island. There is a possibility that there will be periods of stronger, more fresh breezes within the channels and local bays surrounding Maui County. As the parent weak low about 600 miles northwest of Kauai lifts north as an open wave trough at mid week and northeastern high pressure backs further away from the state, this boundary will dissipate through mid to late week. Due to the lack of any appreciable Central Pacific pressure gradient with the high being far off to the northeast and northwestern weak pressure, a weak southeasterly flow will be in place late Thursday. These late week anemic winds will introduce a higher probability of coastal land and sea breezes.

A combination of peak monthly tides and higher-than-predicted water levels by near a foot above MHHW has produced nuisance coastal flooding. Impacts are anticipated around daybreak during peak daily tides. See the latest Special Weather Statement for more details regarding the specific impacts. This should be a short- lived event as daily tidal ranges will lower throughout the second half of the week.

Surf along north and west facing shores will continue to lower into Tuesday as the higher weekend northwest swell dampens out. Outside of a small east to northeast swell that will impact exposed north-facing shores Tuesday through mid week, very little new swell regions are expected to arrive the next few days. A developing gale over the far northwest Pacific near the western Aleutians Tuesday night into Wednesday will track east- northeastward into the Bering Sea through the second half of the week. A large area of strong or gale force winds along the backside of this feature will likely be focused towards the islands. If the 25 to 30 foot generated seas south of the Aleutians that guidance is stating does occur and they follow the northwestern bands towards the chain, then long period swells will be arriving late Saturday into Sunday. These would produce recent surf that was experienced this past weekend along the north and west facing shores.

Surf along east-facing shores will trend up Tuesday through Thursday as an east-northeast swell arrives from a mid week northerly fetch region forming off the Northern California coast. this will be focused at the islands and be timed to arrive next weekend. Otherwise, weak east-southeasterly winds will continue to produce low surf.

Surf along south-facing shores will remain small through the week as a result of both south and south-southeast background swell energy.

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . Bohlin AVIATION . Birchard MARINE . Blood


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NWWH1 - 1611400 - Nawiliwili, HI 20 mi51 min WNW 4.1 G 5.1 86°F1011.2 hPa
51201 - Waimea Bay, HI (106) 82 mi62 min 82°F3 ft
51WH0 - WHOTS - Woods Hole Ocean Time-series 87 mi99 min 77°F 81°F1011.2 hPa74°F

Wind History for Nawiliwili, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lihue, Lihue Airport, HI18 mi4.3 hrsSSE 810.00 miPartly Cloudy79°F73°F82%1011.8 hPa
Kekaha, Pacific Missile Test Facility Barking Sands, HI19 mi73 minSSE 510.00 miFair70°F0°F%1011 hPa

Link to 5 minute data for PHLI

Wind History from HLI (wind in knots)
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Last 24hr--------------W5SW6SW6SW9S6S15S9S11
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1 day agoS5--W3W4--W3W3SW7S7S11S6
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2 days ago--------W6CalmSW5CalmW7W7W7SW4SE8CalmNW5CalmW7S6SW6W5SW6W5SW6W4

Tide / Current Tables for Hanalei Bay, Kauai Island, Hawaii
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Hanalei Bay
Click for Map
Tue -- 05:35 AM HST     2.32 feet High Tide
Tue -- 06:36 AM HST     Sunrise
Tue -- 10:55 AM HST     Moonrise
Tue -- 12:54 PM HST     0.45 feet Low Tide
Tue -- 05:25 PM HST     0.74 feet High Tide
Tue -- 06:08 PM HST     Sunset
Tue -- 09:56 PM HST     Moonset
Tue -- 10:20 PM HST     0.23 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.91.31.82.12.32.32.11.81.410.70.50.50.50.60.70.70.70.60.50.30.20.3

Tide / Current Tables for Hanamaulu Bay, Kauai Island, Hawaii
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Hanamaulu Bay
Click for Map
Tue -- 06:35 AM HST     Sunrise
Tue -- 06:46 AM HST     2.22 feet High Tide
Tue -- 10:54 AM HST     Moonrise
Tue -- 02:20 PM HST     0.45 feet Low Tide
Tue -- 06:07 PM HST     Sunset
Tue -- 06:36 PM HST     0.64 feet High Tide
Tue -- 09:56 PM HST     Moonset
Tue -- 11:46 PM HST     0.23 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.40.71.11.61.92.22.22.11.81.51.10.80.60.50.50.50.60.60.60.60.50.40.3

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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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.