Sunday, January17, 2021
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Marine Weather and Tides
Kaneohe Station, 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 7:10AMSunset 6:12PM Saturday January 16, 2021 11:36 PM HST (09:36 UTC) Moonrise 10:05AMMoonset 9:51PM Illumination 16% 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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PHZ116 Kaiwi Channel- 946 Pm Hst Sat Jan 16 2021
.small craft advisory in effect through Sunday afternoon...
.gale watch in effect from Sunday evening through late Monday night...
Rest of tonight..Southeast winds 15 knots veering southwest after midnight. Wind waves 5 feet. Northwest swell 16 feet decreasing to 14 feet after midnight. Isolated showers.
Sunday..Southwest winds 10 knots. Wind waves 4 feet. Northwest swell 12 feet decreasing to 10 feet in the afternoon. Scattered showers.
Sunday night..Northwest winds 15 knots becoming north to 30 knots after midnight. Wind waves 5 feet. Northwest swell 8 feet. Frequent heavy showers and isolated Thunderstorms.
Monday..North winds to 30 knots. Wind waves 9 feet. Northwest swell 11 feet increasing to 14 feet in the afternoon. Heavy showers likely and isolated Thunderstorms.
Monday night..Northeast winds to 25 knots. Wind waves 9 feet. Northwest swell 14 feet. Showers likely and isolated Thunderstorms.
Tuesday..Northeast winds to 25 knots. Wind waves 9 feet. Northwest swell 12 feet. Showers likely.
Tuesday night..Northeast winds 20 knots. Wind waves 8 feet. North swell 10 feet. Showers likely.
Wednesday..East winds 15 knots. Wind waves 5 feet. North swell 6 to 8 feet. Scattered showers.
Thursday..East winds 15 knots. Wind waves 5 to 6 feet. North swell 4 to 5 feet. Scattered showers.
PHZ100 946 Pm Hst Sat Jan 16 2021
Synopsis for hawaiian coastal waters.. A surface ridge near the islands will move east of the area through Sunday as a strong cold front rapidly approaches from the northwest. The front will reach kauai waters late Sunday afternoon, oahu waters Sunday evening and maui county waters by early Monday, and then stall over the islands. The stalled front will become a trough that will move slowly west Monday and Tuesday, bringing the potential for widespread heavy showers and some Thunderstorms. Strong to near gale-force north and northeast winds will follow the front.


7 Day Forecast for Marine Location Near Kaneohe Station, HI
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location: 21.47, -157.77     debug


Area Discussion for -
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FXHW60 PHFO 170658 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 858 PM HST Sat Jan 16 2021

SYNOPSIS. A cool and wet pattern is on tap for the islands during the first half of the coming week. This comes about as a front moves down the island chain Sunday night, then stalling around Maui and the Big Island between Monday and Tuesday. The front, or trough, is then slated to drift back to Oahu and Kauai between Tuesday night and Wednesday. The front will have good support aloft from an upper level disturbance, resulting in heavy showers and a slight chance of a thunderstorm. Strong trade winds will accompany the passage of the front, along with some cooler temperatures.

DISCUSSION. A change in the weather is forthcoming. A cold front with strong trade winds and cooler temperatures behind it will move down the main Hawaiian Islands, starting with Kauai late Sunday afternoon, Oahu early Sunday evening, Maui County during the rest of Sunday night. The front is expected to come to a rest near Upolu Point Big Island and the Alenuihaha Channel early Monday. Both the new GFS model run and old ECMWF, are in pretty good agreement, although the ECMWF has the front further west over Maui County.

The models have the front, or trough by this time, to drift back west to Oahu on Tuesday, then Kauai Tuesday evening. As the front or trough moves back west, the winds will become easterly and lighter. As noted, the temperatures will be cooler on Monday and Tuesday, lowering from a daytime high of 84 degrees, to the upper 70's and near 80. It could be possibly cooler, in the mid 70's on Monday, with all the clouds and showers.

The rough weather is likely to occur between Monday and Tuesday, that is when the front is slated to be in the vicinity of Maui/Big Island, with increasing upper level support. The upper trough will have a pool of cold air of about minus 16 degrees F at 18k feet. Normally, the temperature at that height is minus 8 degrees F.

In the coming hours, we will be assessing the need for some land based advisories, such as a Flash Flood Watch, beginning as early as Sunday night. The summits of the Big Island may receive some wintry weather as well, which may warrant a Winter Storm Watch. The strong trade winds will may warrant a Wind Advisory as well.

On Wednesday afternoon, the ex-front, now trough, will be west of Kauai, and moving further away from the islands. The weather will be somewhat better with less showers during the second half of next week, but the air mass will still be unstable due to a trough aloft. Trade winds will be in the moderate to strong range across the region.

Currently, light south to southeast winds are present across most of the smaller islands. A shower is noted just off Diamond Head, and scattered showers along Oahu's windward shoreline. We do expect isolated showers to pop up here and there the rest of tonight across the smaller islands. Isolated showers have just sprung up along parts of the Big Island's leeward coast, from north of the airport to around Kawaihae/Kamuela. These showers will dissipate by midnight or drift into the adjacent waters due to a developing land breeze. The Hilo, Puna, parts of the Kau district may get a shower or two overnight, carried ashore by a trade wind flow.

AVIATION. Winds have diminished considerably in advance of a cold front approaching Kauai from the northwest. Mostly clear skies and weak winds will allow land breezes to develop in favored areas tonight as VFR prevails. Light wind will then emerge out of the southwest as the front approaches during Sunday with continued VFR and a low coverage of poorly organized shower activity for Oahu through Big Island. Nothing more than brief MVFR is expected within the heaviest showers for these locations.

Deepening moisture will bring the potential for increasing showers to Kauai by late Sunday morning or early Sunday afternoon with increasing probability for widespread showers after about 00z/2pm HST. Prevailing MVFR and widespread showers, some locally heavy, can be expected over Kauai as front moves across the island around 03z/5pm or shortly thereafter. In addition to the onset of more widespread rainfall, the arrival of the front will be marked by a sharp transition to gusty northerly winds.

No AIRMETs in effect.

MARINE. In summary, expect giant surf to continue tonight, then gradually decline tomorrow, with another giant swell Sunday night into Monday. A potent cold front will move over most of the island chain late Sunday night into Monday, and then stall over the islands Monday and Tuesday, bringing the potential for heavy showers and thunderstorms. Strong to near gale-force N to NE winds will develop over most waters as the front passes, potentially persisting into Tuesday.

A High Surf Warning remains in effect for exposed N and W facing shores as the largest NW swell of the winter season continues to propagate through island waters. The peak of the swell has already occurred in Kauai and Oahu waters, and will likely peak in Maui County and Big Island waters overnight. Buoy data indicate that surf may drop below warning-levels from NW to SE during the day Sunday, but another giant swell building Sunday night and Monday will once again bring warning-level surf, but peak surf heights are expected to be lower than today's swell. Very strong N to NE winds will destroy any chances of quality surf along N facing shores with this swell. A High Surf Advisory remains in effect for exposed N and W facing shores of the Big Island, as most of the swell's energy is blocked from upstream islands.

A Small Craft Advisory remains in effect for all waters except Maalaea Bay, as the NW swell continues to produce seas greater than 10 feet. A Marine Weather Statement is highlighting the potential for surges and significant wave action in and near exposed harbors, although the potential will be gradually diminishing through Sunday. Due to the period and size of the NW swell, some (increasingly reduced) swell may wrap into select S and E facing shores.

A vigorous cold front will rapidly approach the islands from the NW tonight and tomorrow, leading to a period of light to moderate S to SW winds, with some pre-frontal showers developing within this flow through Sunday. The front will move over Kauai Sunday evening, and Oahu by midnight before stalling over the central portion of the island chain early Monday, bringing some heavy showers and the potential for thunderstorms. Strong to near gale- force N to NE winds will follow the front, and a Gale Watch is in effect for waters from the Alenuihaha Channel westward starting Sunday night, due to the tight gradient between a strong high to the NW and the lower pressure along the stalled front (that eventually transitions to a trough). A developing sharp trough aloft on Monday will likely invigorate the lingering moisture through Wednesday as it drifts westward, keeping the potential for heavy showers and thunderstorms.

HFO WATCHES/WARNINGS/ADVISORIES. High Surf Warning until 6 PM HST Sunday for Niihau-Kauai Windward-Kauai Leeward-Waianae Coast-Oahu North Shore-Oahu Koolau-Olomana-Molokai-Maui Windward West-Maui Central Valley- Windward Haleakala.

High Surf Advisory until 6 PM HST Sunday for Kona-Big Island North and East-Kohala.

Small Craft Advisory until 6 PM HST Sunday for all Hawaiian waters except Maalaea Bay-

Gale Watch from Sunday evening through late Monday night for Kauai Northwest Waters-Kauai Windward Waters-Kauai Leeward Waters-Kauai Channel-Oahu Windward Waters-Oahu Leeward Waters- Kaiwi Channel-Maui County Windward Waters-Maui County Leeward Waters-Maalaea Bay-Pailolo Channel-Alenuihaha Channel.



H Lau/JVC/Birchard


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51207 1 mi40 min 78°F7 ft
51210 1 mi40 min 78°F6 ft
MOKH1 - 1612480 - Mokuoloe, HI 3 mi60 min WSW 1.9 G 2.9 72°F 79°F1016.8 hPa
51202 - Mokapu Point, HI (098) 6 mi40 min 78°F7 ft
OOUH1 - 1612340 - Honolulu, HI 13 mi54 min SSW 1.9 G 2.9 72°F 79°F1017.5 hPa
51211 16 mi66 min 78°F3 ft
51201 - Waimea Bay, HI (106) 23 mi59 min 79°F14 ft
51212 23 mi40 min 79°F8 ft

Wind History for Mokuoloe, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kaneohe, Marine Corps Air Station, HI1 mi1.7 hrsN 010.00 miOvercast76°F67°F74%1015.2 hPa
Daniel K Inouye International Airport, HI12 mi43 minE 610.00 miMostly Cloudy75°F66°F74%1016.7 hPa
Wheeler Air Force Base / Oahu, HI14 mi40 minNNW 310.00 miPartly Cloudy65°F65°F99%1016.1 hPa
Oahu, Kalaeloa Airport, HI19 mi43 minN 310.00 miA Few Clouds71°F65°F81%1017.7 hPa

Link to 5 minute data for PHNG

Wind History from HNG (wind in knots)
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Last 24hrE5SE6SE53E5S4S3E113E8E9E9E9NE1034E7E6E4E6CalmCalmW3S3
1 day agoCalmS3S3CalmS3----CalmCalmN3NE5N7N8N9NE7NE6NE6N5NE4NE5E3E5E7E6
2 days agoNE12NE9NE7E9NE10E9E6E7E5SE4
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SW6E9E8E8E96E5SE5SE4SW5CalmW4CalmW4

Tide / Current Tables for Waikane, Kaneohe Bay, Oahu Island, Hawaii
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Waikane
Click for Map
Sun -- 05:14 AM HST     2.17 feet High Tide
Sun -- 07:11 AM HST     Sunrise
Sun -- 10:41 AM HST     Moonrise
Sun -- 01:00 PM HST     0.35 feet Low Tide
Sun -- 06:11 PM HST     Sunset
Sun -- 06:25 PM HST     1.22 feet High Tide
Sun -- 10:43 PM HST     Moonset
Sun -- 11:33 PM HST     0.75 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.711.31.722.22.11.91.61.30.90.60.40.40.40.60.91.11.21.21.110.80.8

Tide / Current Tables for Waimanalo, Oahu Island, Hawaii
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Waimanalo
Click for Map
Sun -- 05:45 AM HST     1.59 feet High Tide
Sun -- 07:10 AM HST     Sunrise
Sun -- 10:40 AM HST     Moonrise
Sun -- 01:09 PM HST     0.13 feet Low Tide
Sun -- 06:11 PM HST     Sunset
Sun -- 06:56 PM HST     0.78 feet High Tide
Sun -- 10:42 PM HST     Moonset
Sun -- 11:42 PM HST     0.46 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.60.81.11.41.51.61.51.310.70.40.20.10.20.30.50.60.70.80.70.70.60.5

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.
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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.