Tuesday, December1, 2020
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Marine Weather and Tides
Kailua, 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 6:50AMSunset 5:48PM Monday November 30, 2020 10:35 PM HST (08:35 UTC) Moonrise 6:20PMMoonset 7:10AM 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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PHZ116 Kaiwi Channel- 946 Pm Hst Mon Nov 30 2020
Rest of tonight..Northeast winds 10 knots. Wind waves 2 feet or less. Northwest swell 4 feet. Slight chance of showers.
Tuesday..Northeast winds 10 knots. Wind waves 2 feet or less. Northwest swell 5 feet increasing to 8 feet in the afternoon.
Tuesday night..Northeast winds 10 knots. Wind waves 3 feet. Northwest swell 12 feet increasing to 15 feet after midnight. Slight chance of showers.
Wednesday..East winds 10 knots. Wind waves 3 feet. Northwest swell 15 feet. Slight chance of showers in the morning.
Wednesday night..East winds 10 knots. Wind waves 3 feet. Northwest swell 13 feet. Slight chance of showers through the night.
Thursday..Northeast winds 10 knots. Wind waves 3 feet. Northwest swell 10 feet. Slight chance of showers through the day.
Thursday night..Northeast winds 15 knots. Wind waves 3 feet. Northwest swell 8 feet. Slight chance of showers.
Friday..Northeast winds 20 knots. Wind waves 5 to 7 feet. Northwest swell 6 to 7 feet. Slight chance of showers.
Saturday..East winds 10 knots becoming variable less than 10 knots. Wind waves 5 to 6 feet. Northwest swell 7 to 9 feet. Slight chance of showers.
PHZ100 946 Pm Hst Mon Nov 30 2020
Synopsis for hawaiian coastal waters.. Light winds will remain through through midweek as a series of fronts pass north of the islands. Fresh trades could briefly return late in the week as a ridge noses eastward behind one of the fronts. A large northwest swell will build across the hawaiian waters Tuesday afternoon and evening, then peak Wednesday.


7 Day Forecast for Marine Location Near Kailua, HI
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location: 21.42, -157.7     debug


Area Discussion for -
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FXHW60 PHFO 010636 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 836 PM HST Mon Nov 30 2020

SYNOPSIS. Light and variable winds remain in the forecast through Thursday with brief periods of showers possible over island interior sections each afternoon with cloud clearing each night. More stable atmospheric conditions are expected through Wednesday with higher shower trends on Thursday and Friday as a weakening front will combine with additional moisture moving in from the east to bring a period of increased shower coverage. Moderate to breezy trade winds return by Friday, with lighter winds returning from Saturday afternoon into Sunday.

DISCUSSION. Satellite imagery this evening shows an upper level low roughly 300 miles east of the Big Island producing thunderstorms with significant lighting activity far east of the state. A cold front moving into the Central Pacific basin roughly 600 miles NW of Kauai is slowly approaching the Hawaiian Islands with the arrival of any shower impacts with this system likely delayed until the Thursday. There is minimal cloud coverage near the islands tonight due to an upper level ridge creating a more stable environment along with light and variable winds. Local radar shows only isolated showers mainly over the coastal waters near Kauai.

A cold front moving slowly through the Central Pacific north of the state will keep the high pressure ridge near the islands in a weakened state. This means that trade winds will diminish leading to a light and variable wind regime. Local scale land and sea breezes will continue in the absence of large scale winds. Onshore daytime sea breezes, produced by solar heating of the land during the day, will cause clouds to converge over island interior sections with only brief period of showers mainly in the afternoon hours. Offshore land breezes, driven by radiational cooling of the land at night, will clear out clouds and showers in the evening hours.

Bundle up. Drier air over the region will lead to cooler morning low temperatures reaching the low to mid 60's through Wednesday morning. Humidity levels will trend higher as additional moisture moves in on Thursday and Friday from a shallow front moving in from the north and a band of moisture drifting in from the east. Morning low temperature will increase by a few degrees due to these rising moisture levels. Shower activity will also increase from Thursday onward due to the cloud band from the weakening front and the return of moderate to breezy trades by Friday. Wind speeds weaken once again from Saturday afternoon into Sunday as yet another cold front moves in far north of the island chain.

AVIATION. Land breezes will clear out remaining clouds over the islands tonight leading to prevailing VFR areawide. Light winds will continue through the forecast period allowing sea breezes and subsequent inland cloud/shower development to take shape again on Tuesday.

MARINE. The first large northwest swell of the season is expected to arrive Tuesday morning, with the first long period energy expected to reach the buoys to the northwest shortly after daybreak. This swell is expected to bring warning level surf by the afternoon/evening hours, and persist into Thursday. Guidance depicts a peak Tuesday night into Wednesday with surf likely reaching the giant category (>40 ft) along exposed shores. Impacts may include significant beach erosion with water sweeping across beach areas that typically remain dry. The highest probability for water reaching coastal roadways and property will be early morning Wednesday as the swell and high tide coincide.

This large northwest swell will drive seas well above the 10 ft Small Craft Advisory (SCA) threshold for waters exposed to northwest swells. Expect the SCA to be posted with the morning package for most waters, and expect seas to remain elevated into Thursday.

Weakening trade winds will allow land and sea breeze regime statewide through midweek as a series of fronts pass north of the islands. Surf along east facing shores will drop through the first half of the week as trade winds diminish. Fresh trades could briefly return late in the week as a ridge noses eastward behind one of the fronts.

Looking ahead, another significant swell event appears possible early next week with models depicting a hurricane force low developing far northwest of the islands Friday, and moving into the central North Pacific Saturday. WAVEWATCH III and ensemble wave data depict this storm producing a large swell arriving in the islands Sunday night. Forecast confidence this far out remains low and changes are likely in the coming days.

HFO WATCHES/WARNINGS/ADVISORIES. High Surf Warning from noon Tuesday to 6 PM HST Thursday for north and west facing shores of Kauai Niihau Oahu Molokai and Maui.



DISCUSSION . Bohlin AVIATION . JVC MARINE . M Ballard


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51202 - Mokapu Point, HI (098) 1 mi40 min 79°F5 ft
51207 5 mi40 min 79°F5 ft
51210 5 mi40 min 79°F5 ft
MOKH1 - 1612480 - Mokuoloe, HI 5 mi60 min SW 1.9 G 1.9 73°F 77°F1017.5 hPa
OOUH1 - 1612340 - Honolulu, HI 12 mi48 min ENE 4.1 G 5.1 74°F 79°F1017.7 hPa
51211 16 mi66 min 79°F2 ft
51212 25 mi40 min 80°F2 ft
51201 - Waimea Bay, HI (106) 28 mi29 min 80°F5 ft

Wind History for Mokuoloe, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kaneohe, Marine Corps Air Station, HI4 mi99 minN 010.00 miMostly Cloudy73°F66°F81%1015.8 hPa
Daniel K Inouye International Airport, HI13 mi43 minNW 310.00 miA Few Clouds73°F64°F74%1017.3 hPa
Wheeler Air Force Base / Oahu, HI18 mi40 minNW 410.00 miFair65°F64°F99%1017.5 hPa
Oahu, Kalaeloa Airport, HI21 mi43 minNE 310.00 miFair69°F64°F87%1018.3 hPa

Link to 5 minute data for PHNG

Wind History from HNG (wind in knots)
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Last 24hrE8E10E8E10--E7E7E4E4E6NE8E76NE7SE6--NE8NE5N4NW5NW4W3CalmCalm
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2 days agoNE15NE15NE13NE15NE16NE16NE15NE15NE16NE12NE13NE12NE12NE12NE14NE13--NE13NE10NE12NE16NE13NE13NE14

Tide / Current Tables for Waimanalo, Oahu Island, Hawaii
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Waimanalo
Click for Map
Tue -- 03:35 AM HST     1.92 feet High Tide
Tue -- 06:52 AM HST     Sunrise
Tue -- 08:04 AM HST     Moonset
Tue -- 11:03 AM HST     0.33 feet Low Tide
Tue -- 03:08 PM HST     0.62 feet High Tide
Tue -- 05:47 PM HST     Sunset
Tue -- 07:07 PM HST     Moonrise
Tue -- 08:38 PM HST     0.03 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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11.41.71.91.91.81.51.20.80.60.40.30.40.50.60.60.60.50.30.20.100.20.4

Tide / Current Tables for Hanauma Bay, Oahu Island, Hawaii
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Hanauma Bay
Click for Map
Tue -- 03:51 AM HST     2.26 feet High Tide
Tue -- 06:52 AM HST     Sunrise
Tue -- 08:04 AM HST     Moonset
Tue -- 11:27 AM HST     0.39 feet Low Tide
Tue -- 03:24 PM HST     0.73 feet High Tide
Tue -- 05:47 PM HST     Sunset
Tue -- 07:07 PM HST     Moonrise
Tue -- 09:02 PM HST     0.04 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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11.51.92.22.32.11.91.51.10.80.50.40.40.50.60.70.70.60.50.30.100.10.4

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 Molokai, 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.