Tuesday, October20, 2020
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Marine Weather and Tides
Wainaku, 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 6:15AMSunset 5:54PM Tuesday October 20, 2020 4:38 AM HST (14:38 UTC) Moonrise 10:31AMMoonset 9:44PM Illumination 15% 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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PHZ122 Big Island Windward Waters- 331 Am Hst Tue Oct 20 2020
Today..East winds 15 knots. Wind waves 3 feet. SWell northeast 4 feet. Isolated showers in the morning.
Tonight..East winds 15 knots. Wind waves 3 feet. SWell northeast 3 to 4 feet.
Wednesday..East winds 10 knots. Wind waves 2 feet or less. SWell northeast 3 feet.
Wednesday night..East winds 10 knots. Wind waves 2 feet or less. SWell northeast 3 feet. Isolated showers through the night.
Thursday..East winds 10 knots. Wind waves 2 feet or less. SWell northeast 3 feet. Isolated showers in the morning.
Thursday night..East winds 10 knots. Wind waves 2 feet or less. SWell northeast 3 feet. Isolated showers through the night.
Friday..East winds 10 knots. Wind waves 3 feet. SWell northeast 3 feet. Isolated showers.
Saturday..Southeast winds 15 knots. Wind waves 4 feet. Mixed swell northwest 3 feet and northeast 3 feet. Isolated showers.
PHZ100 331 Am Hst Tue Oct 20 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 Wainaku, HI
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location: 19.73, -155.06     debug


Area Discussion for -
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FXHW60 PHFO 201358 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 358 AM HST Tue Oct 20 2020

SYNOPSIS. A stationary 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 Wednesday. 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 weekend under a large scale troughing pattern north of the state.

DISCUSSION. This mornings satellite imagery shows a stationary front located near Kauai this morning with convergent bands of clouds and showers moving up from the south over Kauai, Niihau and Oahu. Local scale radar imagery shows numerous showers moving into the southern slopes of Kauai and scattered showers moving over Oahu. Periods of rainfall will continue today and tonight across the western islands. Enough instability and deeper moisture will persist along and east of the front for isolated thunderstorms over Kauai and Niihau including coastal waters through Wednesday afternoon.

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 unstable air bringing periods of showers into the Garden Isle of Kauai.

Saturday through Tuesday . 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 in a weak southeasterly flow pattern. This next low pressure system will continue to weaken the subtropical ridge northeast of the state, keeping the Hawaiian Islands in a light wind pattern with land and sea breezes continuing into the first half of next week. On-shore sea breezes will converge over mountains and island interior sections producing isolated to scattered rainfall coverage, mainly in the afternoon to early evening hours.

AVIATION. Moisture convergence E of a stationary front near Kauai is fueling showers within a somewhat unstable southerly flow from Niihau to Oahu. Some of the showers are locally heavy, and isolated thunderstorms are possible, with periods of MVFR VIS/CIG and isolated areas of IFR VIS/CIG. The shower coverage is sufficiently great to warrant AIRMET SIERRA for the S thru W facing slopes of Kauai and Oahu, with showers generally moving from S to N. Meanwhile, a surface ridge near Maui County and the Big Island is supporting a drier and more stable E-SE flow over those islands. A subsidence inversion based around 6000 feet will keep a cap on clouds, and limit shower potential. Little overall change to this pattern is expected through tonight.

MARINE. 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, a weak southeasterly flow will be in place by 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 through mid week as the higher weekend northwest swell dampens out. Outside of a small east to northeast swell that will impact exposed north-facing shores in the next day or so, very little new swell regions are expected to arrive the next few days. A developing gale over the far northwestern Pacific near the western Aleutians tonight into Wednesday will track east northeast into the Bering Sea through the later half of the week. A large area of strong or gale force winds along the backside of this system will likely be focused along the northwest great circle bands and clip a good portion of the chain. If 25 to 30 foot generated seas south of the Aleutians do materialize, then long period northwest swells will be arriving late Saturday into Sunday. This swell would produce surf heights similar to what was experienced this past weekend along north and west facing shores.

Surf along east-facing shores have trended and will stay up 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 this weekend. Otherwise, weak east to 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
ILOH1 - 1617760 - Hilo, HI 0 mi51 min SSW 1.9 G 4.1 71°F 81°F1010.8 hPa
51206 6 mi56 min 80°F5 ft
KWHH1 46 mi51 min ENE 5.1 G 7 78°F 82°F1010.9 hPa

Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hilo, Hilo International Airport, HI1 mi46 minWSW 410.00 miFair69°F61°F76%1012 hPa

Link to 5 minute data for PHTO

Wind History from HTO (wind in knots)
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Last 24hrCalmS3SW8SW76SE6E10SE10SE12SE9
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1 day agoW8SW7SW6W5W9W9SW9SW5W6S4S4SW6SW4SW4SW4SW3SW4SW4------------
2 days agoSW5SW6SW5S5SE9SE9SE10SE11SE10SE15SE13SE10SE12SE6CalmCalmCalmSW3SW3SW3SW4SW6SW6SW6

Tide / Current Tables for Hilo, Hawaii Island, Hawaii
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Hilo
Click for Map
Tue -- 06:00 AM HST     2.82 feet High Tide
Tue -- 06:16 AM HST     Sunrise
Tue -- 10:31 AM HST     Moonrise
Tue -- 01:42 PM HST     0.55 feet Low Tide
Tue -- 05:49 PM HST     1.24 feet High Tide
Tue -- 05:52 PM HST     Sunset
Tue -- 09:43 PM HST     Moonset
Tue -- 11:08 PM HST     0.33 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.81.31.92.42.72.82.72.421.51.10.80.60.60.711.21.21.20.90.70.40.3

Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Kawaihae
Click for Map
Tue -- 06:20 AM HST     Sunrise
Tue -- 06:52 AM HST     2.43 feet High Tide
Tue -- 10:35 AM HST     Moonrise
Tue -- 02:08 PM HST     0.33 feet Low Tide
Tue -- 05:55 PM HST     Sunset
Tue -- 06:43 PM HST     0.82 feet High Tide
Tue -- 09:46 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.10.10.511.622.32.42.321.51.10.70.40.30.40.50.70.80.80.70.60.30.1

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 Kohala, HI
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weather_mapweather_map weather_map


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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.