Wednesday, December11, 2019
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Marine Weather and Tides
Kaneohe Station, HI

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:57AMSunset 5:51PM Wednesday December 11, 2019 12:43 AM HST (10:43 UTC) Moonrise 5:47PMMoonset 6:30AM Illumination 100% Phase: Full Moon; Moon at 14 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- 945 Pm Hst Tue Dec 10 2019
.small craft advisory in effect from Wednesday morning through Thursday afternoon...
Rest of tonight..East winds 10 knots. Wind waves 3 feet. Northwest swell 8 feet.
Wednesday..East winds 15 knots. Wind waves 3 feet. Northwest swell 9 feet increasing to 11 feet in the afternoon.
Wednesday night..Northeast winds 15 knots. Wind waves 3 feet. Northwest swell 12 feet. Isolated showers.
Thursday..East winds 15 knots. Wind waves 3 feet. Northwest swell 12 feet. Isolated showers.
Thursday night..East winds 15 knots. Wind waves 5 feet. Northwest swell 11 feet. Scattered showers.
Friday..East winds 20 knots. Wind waves 6 feet. Northwest swell 9 feet. Scattered showers.
Friday night..East winds 20 knots. Wind waves 7 feet. Northwest swell 9 feet decreasing to 7 feet after midnight. Scattered showers.
Saturday..East winds 15 knots. Wind waves 6 to 7 feet. Northwest swell 4 to 6 feet. Scattered showers.
Sunday..Northeast winds 20 knots. Wind waves 6 to 7 feet. Northwest swell 4 to 5 feet. Isolated showers.
PHZ100 945 Pm Hst Tue Dec 10 2019
Synopsis for hawaiian coastal waters.. A weak front 125 nm north of kauai will gradually dissipate overnight as a surface ridge holds about 225 miles north of kauai. A new front will stall just northwest of kauai Wednesday night and Thursday while a strong surface high pressure builds far to the northwest. Very large northwest swells are due from late Wednesday into Friday.


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 110633 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 833 PM HST Tue Dec 10 2019

SYNOPSIS. Mostly dry weather and light winds will continue through Wednesday with a stable airmass overhead. A front will be near Kauai on Thursday with increasing shower coverage especially over the west end of the state. Moisture from the front will become focused over the windward and mauka areas Friday as trades begin to strengthen, with drier weather over the weekend.

DISCUSSION. No significant changes are expected to the forecast tonight. Lighter winds for the next 24 hours or so will continue with a stable airmass overhead limiting clouds and showers. A front approaching from the northwest will bring increasing clouds and showers to the western end of the island chain on Thursday.

High pressure building north of the front will help to wash the front out by Friday, and bring building trade winds to the region. Moisture left over from the front will then ride in on the trades, bringing a wet trade wind pattern to the windward and mauka areas.

There are some differences in the models over the weekend for the upper levels. Both the GFS and ECMWF show an upper level trough northwest of Kauai on Friday. The ECMWF brings the upper level trough down the island chain and weakens it through the weekend. Meanwhile the GFS shows an upper level low forming at the southern base of the trough on Saturday, to the southwest of the islands. After the upper low forms, the remainder of the upper trough near the islands washes out. This upper level feature could have an impact on the amount and intensity of the showers moving over the islands over the weekend. Will be taking a closer look at the model runs that come in overnight before making any changes to the current forecast.

AVIATION. With a weak background flow from the east, nighttime land breezes and daytime sea breezes will develop over the much of the state through Wednesday. This will lead to some cloud buildups over island interiors in the afternoons and evenings with little in the way of showers expected, then clearing out overnight. VFR will dominate over most areas.

MARINE. A current mix of a east-southeast to east wind flow will become more of a trade wind flavor area-wide on Wednesday. Strength will be pretty much light to moderate as the surface ridge some 225 nm N of Kauai edges slightly northward. There is a old frontal boundary just S of the ridge, some 125 nm N of Kauai that will continue to fall apart as the night progresses. A new front, though, some 480 nm NW of Kauai will be weakening as it moves eastward. This front will enter the far NW offshore waters Wednesday afternoon and stalls just outside the nearshore waters of NW Kauai Thursday night. NE 15 to 25 kt winds lies just to the west of this front, and in due course in the following 24 hours, into early Friday morning, it will build to gale force strength across our SW through NW and N offshore waters. The gale force winds will last through Friday, then easing slightly to NE 20 to 30 kt winds across the aforementioned areas, as the front weakens to a trough Friday night while drifting west, away from the islands over the weekend. The waters around Kauai and Niihau, Oahu's windward waters may be grazed with some small craft level winds of 23 kt or more Thursday night and Friday. SCA level trades then shifts over to waters around Maui County and waters south of the Big Island on Friday. A new high is slated to pass north of the islands early next week, thus maintaining the SCA.

The northwest swell will hold around similar heights through tonight then rise significantly on Wednesday. Deep ocean buoy 51101, northwest of Kauai, has a 10 foot swell at 15 seconds this hour, which is pretty much in line with WW3, while the Waimea PacIOOS buoy has a reading of 8 foot wave height and 14 second period. Border line advisory surf is expected to continue across most north and west facing shores from Kauai to Maui tonight, followed by a significant rise in swell Wednesday and Wednesday night. A High Surf Warning has been posted for this rise, even though warning level surf is not expected until afternoon on Kauai and Oahu and on Molokai and Maui until evening. The large surf will peak early Thursday then decline below the advisory level late Friday. Another pulse of northwest swell may produce advisory level surf early next week.

Due to the weak trades, surf along east facing shores will continue below seasonal average for another 24 hour or so. A boost in the trades Thursday night and Friday, will likely lead to higher surf along the east facing shores of all islands, but especially for Kauai and Oahu. Waters will turn particularly very rough and choppy around Kauai as discussed above. The trade swell will gradually back down over the weekend as the trade wind eases. A Small Craft Advisory (SCA) in effect for the building seas to 10 feet or higher the rest of tonight and Wednesday. The SCA covers waters around Kauai and north of Oahu tonight, then expands to most waters exposed to the northwest swell on Wednesday. The SCA will likely be expanded to cover waters around Maui County and waters south of the Big Island for locally strong trades Thursday night or Friday. Given the outlook described above, expect this SCA, due to locally strong trades, to likely continue through the weekend and into early next week.

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

Small Craft Advisory from 6 AM Wednesday to 6 PM HST Thursday for Oahu Leeward Waters-Kaiwi Channel-Maui County Windward Waters-Big Island Windward Waters.

Small Craft Advisory from midnight tonight to 6 PM HST Thursday for Kauai Northwest Waters-Kauai Windward Waters-Kauai Leeward Waters-Kauai Channel-Oahu Windward Waters.



DISCUSSION . M Ballard AVIATION . TS MARINE . H Lau


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51207 1 mi44 min 80°F5 ft
51210 1 mi44 min 79°F4 ft
MOKH1 - 1612480 - Mokuoloe, HI 3 mi68 min E 1.9 G 6 78°F 79°F1018.1 hPa
51202 - Mokapu Point, HI (098) 6 mi44 min 79°F7 ft
OOUH1 - 1612340 - Honolulu, HI 13 mi62 min Calm G 1 76°F 81°F1018 hPa
51211 16 mi74 min 81°F2 ft
51201 - Waimea Bay, HI (106) 23 mi68 min 77°F9 ft
51212 23 mi44 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, HI1 mi1.8 hrsESE 310.00 miPartly Cloudy77°F70°F79%1016.7 hPa
Daniel K Inouye International Airport, HI12 mi51 minNNW 310.00 miA Few Clouds74°F68°F82%1017.9 hPa
Wheeler Air Force Base / Oahu, HI14 mi1.8 hrsWNW 310.00 miFair68°F67°F99%1017.3 hPa
Oahu, Kalaeloa Airport, HI19 mi51 minNE 310.00 miFair72°F66°F84%1018.9 hPa

Link to 5 minute data for PHNG

Wind History from HNG (wind in knots)
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Last 24hrCalmS3CalmS3CalmS4CalmNW3CalmN55NE7E8NE7NE7E4E5E4E3E4E7E3SE3E4
1 day agoCalmCalmCalmCalm------CalmNE5E454E4E4NE5NE6E3E3CalmCalmCalmSW3S3Calm
2 days agoCalmS3CalmCalmCalmS3CalmW3CalmNE4NE7NE8NE5NE6NE6N4N3CalmS3CalmCalmS3CalmS3

Tide / Current Tables for Honolulu, Honolulu Harbor, Oahu Island, Hawaii
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Hanauma Bay, Oahu Island, Hawaii
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Hanauma Bay
Click for Map
Wed -- 02:47 AM HST     2.29 feet High Tide
Wed -- 06:29 AM HST     Moonset
Wed -- 06:57 AM HST     Sunrise
Wed -- 10:05 AM HST     0.36 feet Low Tide
Wed -- 02:18 PM HST     0.84 feet High Tide
Wed -- 05:47 PM HST     Moonrise
Wed -- 05:49 PM HST     Sunset
Wed -- 07:14 PM HST     Full Moon
Wed -- 08:11 PM HST     -0.12 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.51.92.22.32.11.81.410.70.40.40.40.60.70.80.80.70.50.2-0-0.1-0.10.20.7

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 (5,6,7,8)
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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 numerious 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.