Friday, August14, 2020
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Marine Weather and Tides
Kaneohe, HI

Version 3.4
NOTICE
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 6:08AMSunset 7:03PM Thursday August 13, 2020 10:41 PM HST (08:41 UTC) Moonrise 1:07AMMoonset 2:43PM Illumination 21% Phase: Waning Crescent; Moon at 25 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- 1000 Pm Hst Thu Aug 13 2020
Rest of tonight..East winds 15 knots. Wind waves 4 feet. Northeast swell 5 feet. Isolated showers.
Friday..East winds 15 knots. Wind waves 4 feet. Northeast swell 5 feet. Isolated showers through the day.
Friday night..East winds 20 knots. Wind waves 4 feet. Northeast swell 4 feet. Isolated showers through the night.
Saturday..East winds 20 knots. Wind waves 4 feet. Northeast swell 4 feet. Isolated showers through the day.
Saturday night..Northeast winds 15 knots. Wind waves 5 feet. Northeast swell 3 feet. Isolated showers.
Sunday..Northeast winds 15 knots. Wind waves 5 feet. Northeast swell 3 feet. Isolated showers through the day.
Sunday night..Northeast winds 15 knots. Wind waves 5 feet. Northeast swell 3 feet. Isolated showers.
Monday..East winds 15 knots. Wind waves 3 to 4 feet. SWell southeast 3 feet. Isolated showers.
Tuesday..East winds 10 knots. Wind waves 3 feet. SWell southeast 3 feet. Isolated showers.
PHZ100 1000 Pm Hst Thu Aug 13 2020
Synopsis for hawaiian coastal waters.. The pressure gradient will strengthen over the islands Friday night through Saturday night as low pressure passes far south of the area. The gradient will weaken Sunday into early next week as the low pressure system continues westward and the ridge to the north weakens.


7 Day Forecast for Marine Location Near Kaneohe, HI
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location: 21.42, -157.78     debug


Area Discussion for -
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FXHW60 PHFO 140641 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 841 PM HST Thu Aug 13 2020

SYNOPSIS. A ridge of high pressure north of the state will maintain moderate trade winds through at least early next week. Some day to day fluctuations are expected, with a slight increase in trade wind speeds expected Friday night and Saturday. Otherwise, our typical trade wind weather is expected with showers favoring windward and mountain areas, especially during the early morning and overnight hours. A trough of low pressure aloft could bring an increase in shower coverage and intensity Tuesday through late next week.

DISCUSSION. Currently at the surface, a 1031 mb high is centered around 1600 miles north-northeast of Honolulu, and is driving moderate trade winds across the island chain this evening. Infrared satellite imagery shows partly cloudy skies in most areas, although a bit more cloud cloudiness is present over leeward sections of the Big Island and Maui. Radar imagery showers scattered showers over windward slopes and coasts, with a few lingering leeward showers in the more sheltered areas of Maui and the Big Island. Main short term concern revolves around rain chances and trade wind trends during the next couple days.

High pressure north of the state will keep moderate trade winds in place tonight and Friday. The trades then are expected to increase slightly Friday night and Saturday as the gradient tightens in response to a broad area of low pressure passing by to the south of the state. The trades should trend back to moderate levels Sunday through Tuesday as the ridge north of the islands weakens. The gradient is forecast to relax further Wednesday through late next week, with trades lowering into the light to moderate range and allowing for sea breezes and land breezes in the more sheltered leeward areas.

As for weather details, fairly typical trade wind conditions will continue tonight through Monday with bands of moisture moving through the islands bringing scattered windward showers and the occasional leeward spillover. Showers will be most prevalent during the night and early morning hours during this time frame. Troughing aloft is forecast to build southward over the state Tuesday through late next week, and this should elevate inversion heights and bring an increase in shower coverage and intensity statewide. Showers will continue to favor windward slopes and coasts during this time, with an increase in leeward and interior shower activity during the afternoon and evening hours.

AVIATION. A high pressure ridge north of the Hawaiian Islands will keep moderate trade winds in the forecast over the next 24 hours. Passing showers may produce brief MVFR conditions with scattered shower activity mainly over windward and mountain areas.

No AIRMETs are in effect and none are expected.

MARINE. Moderate to fresh easterly trades will continue through Friday, then briefly increase into the fresh to strong category Friday night through late Saturday as the pressure gradient tightens over the islands in response to low pressure passing far to the south. This will likely translate to a Small Craft Advisory being issued for the typical windier waters between Maui County and the Big Island by or come Friday afternoon. Guidance shows the gradient quickly relaxing Sunday into early next week as this area of low pressure to the south continues westward and a weakness in the subtropical ridge forms far north of the state as a backdoor front drops southward toward 30N.

Surf along east facing shores will hold steady into the weekend near or just under the advisory level of 8 ft (faces) as a moderate northeast swell moves through from a batch of strong breezes that setup within the 040-050 degree band off the west coast earlier this week. Surf will gradually ease Sunday into early next week as the winds relax locally as the swell drops. Although confidence remains low, a small easterly swell will remain possible from distant Elida in the eastern Pacific over the weekend, mostly for the eastern end of the state.

Surf along south facing shores will remain small through Saturday, then gradually trend up Sunday into early next week as a small, south-southwest swell from recent activity down near New Zealand arrives. The PacIOOS nearshore Pago Pago buoy reflects this small source moving through over the past 36-Hrs. WAVEWATCH III guidance shows a reinforcement out of the same area Monday night through Tuesday, which should hold through midweek before easing. For the long range, another similar pulse will become a possibility through the third week of the month as low pressure systems continue to move through Hawaii's swell window southeast of New Zealand.

Surf along north facing shores will remain near the summertime average through the period, except for locations exposed to the previously discussed northeast swell.

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . Jelsema AVIATION . Bohlin MARINE . Gibbs


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MOKH1 - 1612480 - Mokuoloe, HI 1 mi65 min E 2.9 G 6 79°F 82°F1015.7 hPa
51207 4 mi45 min 80°F6 ft
51210 4 mi45 min 80°F5 ft
51202 - Mokapu Point, HI (098) 5 mi45 min 80°F6 ft
OOUH1 - 1612340 - Honolulu, HI 9 mi53 min NE 1.9 G 5.1 1015.8 hPa
51211 13 mi71 min 81°F3 ft
51212 21 mi45 min 82°F3 ft
51201 - Waimea Bay, HI (106) 25 mi195 min 81°F4 ft

Wind History for Mokuoloe, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kaneohe, Marine Corps Air Station, HI2 mi1.7 hrsE 910.00 miPartly Cloudy82°F69°F65%1014 hPa
Daniel K Inouye International Airport, HI9 mi48 minNE 810.00 miA Few Clouds79°F68°F69%1015.5 hPa
Wheeler Air Force Base / Oahu, HI14 mi45 minNE 810.00 miFair75°F66°F77%1014.7 hPa
Oahu, Kalaeloa Airport, HI17 mi48 minN 010.00 miMostly Cloudy77°F66°F71%1016.6 hPa

Link to 5 minute data for PHNG

Wind History from HNG (wind in knots)
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Last 24hrE9E8E9E9E5E6E10E8E7E9NE10E11E11E11E11NE11E10NE11E11NE11E9E8E9E8
1 day agoE9E6
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63E96E7E7E7E9E9E9E11NE10E10NE13NE15E11NE12E13E9E9E10E10
2 days agoE10E11E10E7E7E6E5E8E6E8E7E7NE10NE11E10NE13E9NE10E12E9E12E9E10E8

Tide / Current Tables for Waikane, Kaneohe Bay, Oahu Island, Hawaii
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Waikane
Click for Map
Fri -- 01:53 AM HST     Moonrise
Fri -- 04:27 AM HST     0.44 feet Low Tide
Fri -- 06:09 AM HST     Sunrise
Fri -- 11:46 AM HST     2.40 feet High Tide
Fri -- 03:39 PM HST     Moonset
Fri -- 07:02 PM HST     Sunset
Fri -- 07:39 PM HST     0.72 feet Low Tide
Fri -- 11:19 PM HST     1.11 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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10.90.70.50.40.50.60.91.31.72.12.32.42.32.11.71.41.10.90.70.70.811.1

Tide / Current Tables for Waimanalo, Oahu Island, Hawaii
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Waimanalo
Click for Map
Fri -- 01:52 AM HST     Moonrise
Fri -- 04:36 AM HST     0.20 feet Low Tide
Fri -- 06:09 AM HST     Sunrise
Fri -- 12:17 PM HST     1.79 feet High Tide
Fri -- 03:38 PM HST     Moonset
Fri -- 07:01 PM HST     Sunset
Fri -- 07:48 PM HST     0.45 feet Low Tide
Fri -- 11:50 PM HST     0.69 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.50.40.30.20.20.30.50.81.11.41.71.81.81.61.41.10.80.60.50.40.50.60.7

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
Wind Forecast for (4,6,7,8)
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Ground Weather Radar Station Molokai, 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.