Friday, December13, 2019
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Marine Weather and Tides
Kailua, 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 6:58AMSunset 5:51PM Thursday December 12, 2019 7:21 PM HST (05:21 UTC) Moonrise 6:40PMMoonset 7:29AM Illumination 98% 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- 345 Pm Hst Thu Dec 12 2019
.small craft advisory in effect through early Saturday morning...
Tonight..Northeast winds 20 knots. Wind waves 4 feet. Northwest swell 11 feet. Scattered showers in the evening. Isolated showers after midnight.
Friday..Northeast winds to 25 knots. Wind waves 6 feet. Northwest swell 10 feet decreasing to 8 feet in the afternoon. Scattered showers in the morning, then isolated showers in the afternoon.
Friday night..East winds to 25 knots. Wind waves 7 feet. Northwest swell 6 feet and northeast 3 to 4 feet. Isolated showers.
Saturday..East winds 20 knots. Wind waves 7 feet. Northwest swell 4 feet and northeast 4 feet. Scattered showers in the morning. Isolated showers in the afternoon.
Saturday night..East winds 20 knots. Wind waves 6 feet. Northwest swell 4 feet and northeast 4 feet. Isolated showers.
Sunday..Northeast winds 20 knots. Wind waves 6 feet. Northwest swell 4 feet. Isolated showers through the day.
Sunday night..Northeast winds 20 knots. Wind waves 7 feet. Northwest swell 5 feet. Scattered showers.
Monday..Northeast winds 20 knots. Wind waves 7 to 8 feet. Northwest swell 7 to 9 feet. Isolated showers.
Tuesday..East winds 20 knots. Wind waves 7 feet. Northwest swell 7 to 9 feet. Isolated showers.
PHZ100 345 Pm Hst Thu Dec 12 2019
Synopsis for hawaiian coastal waters.. A stationary front just nw of kauai may bring some unsettled weather around kauai tonight. Meanwhile, a high building north of the state will bring the return of moderate to locally strong trades through Saturday. A slight decline in trades is possible Sunday, but a new high building north of the state will boost trades once again to strong speeds by early next week. The current large northwest swell has peaked and will slowly subside through Saturday


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 130208 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 408 PM HST Thu Dec 12 2019

SYNOPSIS. Trade winds will increase tonight and Friday as strong high pressure moves north of the islands and a stalled front near Kauai falls apart. Moisture along the front will fuel enhanced showers around Kauai tonight, while rainfall favors windward slopes across the rest of the state. An approaching upper level trough will lead to a period increased high clouds late tonight and Friday. Trades will decrease during the weekend as an increasingly stable pattern of mainly windward rainfall develops. Stronger trades are expected early next week.

DISCUSSION. A rather light easterly trade wind flow persists across much of the state this afternoon, though winds are increasing across western Kauai. A stalled front located roughly 35 miles northwest of Kauai continues to bisect pair of surface highs centered about 1700 east-northeast and 1000 northwest of the state. As a result, the pressure gradient over the islands remains rather weak and is maintaining gentle to locally moderate easterly trade winds that have been overpowered by leeward sea breezes on most islands. However, as the high to the northwest approaches, northeasterly winds have bled through the front and reached western Kauai this afternoon. This has increased moisture around Kauai, and an approaching upper level trough is producing some instability, leading to active showers flaring over and around Kauai. Modest shower activity from Oahu to the Big Island is confined largely to windward terrain and the interior.

Trades will ramp up considerably tonight and Friday as high clouds briefly thicken. The somewhat strong surface high currently sitting northwest of the state will pass by to the north, as the front stalled just northwest of Kauai begins to fall apart. Expect stronger trades to continue to build around Kauai tonight, then state-wide on Friday as the front further erodes. Enhanced moisture will continue to be pooled just north of Kauai, while the upper level trough moves overhead. The greatest instability and potential for heavy showers and thunderstorms will remain north and west of Kauai, but we have included a slight chance of thunderstorms for the Garden Isle tonight. Elsewhere, a typical pattern of windward rainfall will prevail, with a few showers blowing over to leeward areas. The approaching upper level trough will also tap high level moisture and spread thickening high clouds over the islands on Friday.

Breezy trades will slowly subside during the weekend as high clouds thin. The surface high will move off to the northeast, and its trailing ridge north of the islands will be weakened, allowing trades to back off to moderate strength by Sunday. The upper level over the state will creep eastward and slowly fill as a mid level ridge strengthens. As a result, expect an increasingly stable pattern of mainly windward showers and decreasing high clouds.

Another shot of stronger trades is due Monday and Tuesday as another high pass north of the state, followed by another bout of strong trades late next week. A ridge aloft will strengthen on Monday, maintaining a rather stable weather pattern with showers remaining focused on windward slopes.

AVIATION. East or northeast moderate trades will persist this evening and into tonight as a stationary front remains planted northwest of Kauai. Thus, during the overnight hours, scattered showers will mainly affect windward sections of Oahu, Molokai, Maui, and the Big Island. Additional moisture, associated with front, will allow for numerous showers over Kauai. MVFR conditions may develop with periods of mountain obscuration.

No AIRMETs are in effect at this time.

MARINE. The current large northwest swell has peaked and will gradually subside over the next few days. Surf will remain at warning levels through tonight for exposed north and west facing shores and is expected to drop to advisory levels on Friday. A low currently moving off the coast of Japan had winds of up to 60 knots on the ASCAT pass today. This low pressure system will be the next source of swell. We should see long-period forerunners arrive late Sunday night and steadily build throughout the day Monday out of the west-northwest to northwest direction. Surf will likely reach advisory levels by Monday afternoon and possibly near warning levels Monday night. This swell should slowly decline Tuesday into Wednesday, but will likely be reinforced by another large northwest swell Wednesday night into Thursday.

A stationary front just NW of Kauai may bring some unsettled weather around Kauai tonight. Meanwhile, a high building north of the state will bring the return of moderate to locally strong trades through the weekend. A slight decline in trades is possible Sunday, but a new high building north of the state will boost trades once again to strong speeds by early next week. Strong trades are expected to persist through the first half of next week.

Surf along east facing shores is currently below the seasonal average. A boost in the trades tonight and Friday will lead to higher surf along east facing shores of all islands, but especially for Kauai where surf may near advisory levels for east facing shores. Some increase in surf is also expected from a northeast swell entering Hawaiian waters Friday and Saturday. Due to the large northwest swell and an increase in trades, a Small Craft Advisory has been posted for all Hawaiian Waters except Leeward Maui County through early Saturday morning. Seas are expected to drop below advisory levels sometime on Saturday.

HFO WATCHES/WARNINGS/ADVISORIES. High Surf Warning until 6 AM HST Friday for north and west facing shores of Niihau, Kauai, Oahu, and Molokai, and for north facing shores of Maui.

High Surf Advisory until 6 AM HST Friday for Kona.

Small Craft Advisory until 6 AM HST Saturday for all waters except Maui County Leeward.



DISCUSSION . Wroe AVIATION . Thomas MARINE . Kino


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51202 - Mokapu Point, HI (098) 1 mi51 min 80°F6 ft
51207 5 mi51 min 80°F7 ft
51210 5 mi51 min 80°F7 ft
MOKH1 - 1612480 - Mokuoloe, HI 5 mi45 min NE 8.9 G 11 78°F 80°F1017.6 hPa
OOUH1 - 1612340 - Honolulu, HI 12 mi57 min N 1 G 5.1 79°F 81°F1017.1 hPa
51211 16 mi51 min 81°F2 ft
51212 25 mi51 min 82°F5 ft
51201 - Waimea Bay, HI (106) 28 mi45 min 77°F13 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 mi77 minNE 1010.00 miA Few Clouds78°F72°F82%1016.3 hPa
Daniel K Inouye International Airport, HI13 mi28 minENE 810.00 miPartly Cloudy79°F66°F67%1017.3 hPa
Wheeler Air Force Base / Oahu, HI18 mi25 minNNW 710.00 miLight Drizzle74°F68°F85%1017.1 hPa

Link to 5 minute data for PHNG

Wind History from HNG (wind in knots)
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Last 24hrCalmW5CalmCalmCalmCalmSW3CalmCalmCalmCalmCalmCalmW3NW3N4N4N6NE6NE6NE6NE7NE10NE10
1 day agoE3E4E7E3SE3E4E3E3--SW5W5CalmCalmCalmE663E7E8E7E7E6E4S3
2 days agoCalmCalmCalmSW3S3CalmCalmS3CalmS3CalmS4CalmNW3CalmN55NE7E8NE7NE7E4E5E4

Tide / Current Tables for Waimanalo, Oahu Island, Hawaii
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Waimanalo
Click for Map
Fri -- 03:49 AM HST     2.06 feet High Tide
Fri -- 06:59 AM HST     Sunrise
Fri -- 08:27 AM HST     Moonset
Fri -- 11:18 AM HST     0.22 feet Low Tide
Fri -- 03:36 PM HST     0.60 feet High Tide
Fri -- 05:50 PM HST     Sunset
Fri -- 07:37 PM HST     Moonrise
Fri -- 09:01 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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0.91.41.722.11.91.71.30.90.60.30.20.20.40.50.60.60.50.40.20-000.3

Tide / Current Tables for Hanauma Bay, Oahu Island, Hawaii
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Hanauma Bay
Click for Map
Fri -- 04:05 AM HST     2.43 feet High Tide
Fri -- 06:59 AM HST     Sunrise
Fri -- 08:26 AM HST     Moonset
Fri -- 11:42 AM HST     0.26 feet Low Tide
Fri -- 03:52 PM HST     0.70 feet High Tide
Fri -- 05:50 PM HST     Sunset
Fri -- 07:37 PM HST     Moonrise
Fri -- 09:25 PM HST     -0.05 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.91.41.92.32.42.32.11.71.20.80.50.30.30.40.50.70.70.60.50.30.1-0-00.2

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 (0,6,7,8)
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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 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.