Thursday, December12, 2019
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Marine Weather and Tides
Wainaku, 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 6:44AMSunset 5:44PM Thursday December 12, 2019 8:19 AM HST (18:19 UTC) Moonrise 6:32PMMoonset 7:14AM 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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PHZ122 Big Island Windward Waters- 355 Am Hst Thu Dec 12 2019
.small craft advisory in effect through late this afternoon...
Today..East winds 15 knots. Wind waves 4 feet. Northwest swell 13 feet. Chance of showers.
Tonight..East winds 20 knots. Wind waves 5 feet. Northwest swell 11 feet and north 3 feet. Scattered showers.
Friday..East winds 20 knots. Wind waves 6 feet. Northwest swell 9 feet. SWell north 3 to 5 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Friday night..East winds 20 knots. Wind waves 6 feet. Northwest swell 8 feet and north 5 to 6 feet. Scattered showers.
Saturday..East winds 20 knots. Wind waves 7 feet. Northwest swell 7 feet and north 5 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Saturday night..East winds 15 knots. Wind waves 7 feet. Northwest swell 6 feet. SWell north 5 feet. Isolated showers in the evening, then scattered showers after midnight.
Sunday..Northeast winds 15 knots. Wind waves 5 to 6 feet. Northwest swell 5 to 6 feet. Scattered showers.
Monday..East winds 20 knots. Wind waves 6 to 7 feet. Northwest swell 6 to 8 feet. Scattered showers.
PHZ100 355 Am Hst Thu Dec 12 2019
Synopsis for hawaiian coastal waters.. A front is moving southeast over the far northwest offshore waters this morning. This front will stall just nw of kauai Thursday night and dissipate Friday. A strong surface high will pass north of the islands Thursday night into Friday, driving a boost in trade wind speeds. A large northwest swell will peak this morning then slowly subside through Saturday.


7 Day Forecast for Marine Location Near Wainaku, HI
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location: 19.73, -155.06     debug


Area Discussion for -
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FXHW60 PHFO 121402 CCA AFDHFO

Area Forecast Discussion . CORRECTED National Weather Service Honolulu HI 402 AM HST Thu Dec 12 2019

SYNOPSIS. Light trade winds and mostly dry weather will prevail today. Strong high pressure passing north of the islands will bring increasing trade winds tonight and Friday, with locally breezy trades persisting into the weekend. The strengthening trade winds will bring passing clouds and showers to windward portions of the islands, but a front stalling just northwest of the area will bring increased rainfall to Kauai and adjacent waters the next couple of days. High clouds are expected to periodically pass over the islands starting tonight and persisting through Saturday.

DISCUSSION. Have made some modifications to the grids, but no major changes to the overall forecast. In general the winds have been nudged closer to the latest GFS solution, but the flavor remains the same with trade winds increasing starting tonight, and remaining trades into next week. Modified the PoPs and associated fields for tomorrow to better align the model solutions across the board. This boosts PoPS across the area, but didn't got go as high as many of the models.

A recent VIIRS day/night band satellite image shows mostly clear skies over most of the islands, with Oahu have the most clouds focused over the windward Koolau slopes. Clouds associated with a front to the northwest of the islands are about 60 miles northwest of Kauai at 2am.

The latest GFS and ECMWF models continue to show some differences with an upper level system moving over the islands, however both bring some instability near the islands tonight and tomorrow. Thunderstorms are observed just outside the coastal waters to the southeast of Kauai this morning. The models show the strongest dynamics for thunderstorms to remain to the southeast where a mid to upper level low forms along the base of the upper level trough. Will need to be monitoring the thunderstorm area to see if they will edge into the coastal waters and Kauai, but at this time have left them out. The proximity of the system to Kauai will place them in the greatest chance for enhanced rainfall.

High pressure far northwest of the islands will move to the east through the weekend, followed by another high early next week. Both highs will remain north of the islands. The front to the northwest of the islands will be pushed over the western end of the coastal waters today, and winds north of the front are expected to be strong and out of the northeast, while out ahead of the front moderate easterly trades are expected tonight and Friday.

As the high mentioned above moves to the east this weekend, the upper level low will move to the west, and locally breezy trade winds will spread across the islands. As we transition to the second high, trade winds could slacken a bit on Sunday, before rebounding with the second high Monday and Tuesday. With the trade wind flow over the islands. showers will be focused over windward areas for the remaining islands.

Mid and upper level ridging moving over the region early next week will help to stabilize the atmosphere limiting trade winds showers, however leftover frontal moisture will be riding in on the trades at times will bring some moisture bands in on the trades from time to time.

AVIATION. With a light east to southeast background flow, early morning land breezes will give way to developing sea breezes over parts of the state this afternoon. This will lead to some cloud buildups over island interiors into the evening. Little in the way of rainfall is expected due to a stable air mass over the area. VFR will dominate in most areas. A front approaching from the northwest will begin to affect Kauai as early as this afternoon, with increasing trade winds, clouds and showers. Clouds and winds will increase for the rest of the state by Friday as the front stalls near the Garden Isle.

MARINE. A large northwest swell will maintain surf above warning levels today and tonight. A High Surf Warning is in effect for north and west facing shores of Niihau, Kauai, Oahu, and Molokai as well as for north facing shores of Maui. A high surf advisory is in effect for the leeward Big Island coast. The surf will peak this morning and then slowly subside into Saturday. Another northwest swell may produce advisory level surf early next week.

A full moon high tide early this morning (between 2-6am depending on location) and the large NW swell will bring the potential of overwash along coastal areas. As of 3am, the swell is running 2 feet larger than the WW3 predicted values at the Waimea buoy, reaching over 14 feet. Added to the large swell and full moon tide, is the fact that tide gauges across the state have been showing water levels near 6/10 of a foot above predicted values. All of these factors combined will allow waves to reach higher along exposed coastlines and over low lying coastal roadways.

A front moving SE over the NW offshore waters will stall tonight NW of Kauai. A new high will pass north of Kauai tonight and Friday, driving a boost in northeast winds to near gale force north of the front. Waters around Kauai will see the strongest winds tonight and Friday. Strong trades will also develop over the typically windy coastal waters Friday. As the high continues eastward, trades will weaken over the western end of the island chain by Saturday, but the locally strong trades over the eastern waters will continue through the weekend and into next week.

Surf along east facing shores is currently below the seasonal average. A boost in the trades today and Friday will lead to higher surf along east facing shores of all islands, but especially for Kauai where a High Surf Advisory may be needed for east facing shores. Some increase in surf is also expected from a northeast swell entering Hawaiian waters Friday and Saturday. The trade swell will gradually ease this weekend. Due to the large northwest swell, a Small Craft Advisory is in effect for all windward waters as well as the leeward waters of Kauai and Oahu, including the Kaiwi Channel. This advisory will also cover the strong northeast winds slated for Kauai County waters tonight into Friday. A Small Craft Advisory for winds will likely be issued for waters around Maui County and south of the Big Island later today. Expect this advisory to continue through the weekend and into early next week.

HFO WATCHES/WARNINGS/ADVISORIES. High Surf Warning until 6 PM HST this evening 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 this evening for Kona.

Small Craft Advisory until 6 PM HST this evening for Kauai Northwest Waters-Kauai Windward Waters-Kauai Leeward Waters- Kauai Channel-Oahu Windward Waters-Oahu Leeward Waters-Kaiwi Channel-Maui County Windward Waters-Big Island Windward Waters.



DISCUSSION . M Ballard AVIATION . TS MARINE . Morrison


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 0 mi49 min S 1.9 G 4.1 71°F 80°F1017.6 hPa
51206 6 mi33 min 79°F10 ft
KWHH1 46 mi49 min E 2.9 G 4.1 75°F 80°F1017.3 hPa

Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hilo, Hilo International Airport, HI1 mi26 minSW 68.00 miLight Rain72°F64°F76%1018 hPa

Link to 5 minute data for PHTO

Wind History from HTO (wind in knots)
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Last 24hrW7W7SE5S7S4SE8E11E6E7CalmCalmCalmCalmS3SW4CalmS4S4CalmSW4SW4SW5SW6SW6
1 day agoW9W6S5SE6E8E9SE7E9E7SE4S3SW4S3S4SW4SW6W8W7W5SW5SW5SW6SW6S3
2 days agoSW4SE3E7SE5SE5E8S7E9SE5CalmS3S3S3SE5CalmCalmCalmSW4CalmSW3W7SW8W7SW7

Tide / Current Tables for Hilo, Hilo Bay, Kunio Bay, Hawaii 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 Kawaihae, Big Island, Hawaii
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Kawaihae
Click for Map
Thu -- 04:22 AM HST     2.61 feet High Tide
Thu -- 06:48 AM HST     Sunrise
Thu -- 07:17 AM HST     Moonset
Thu -- 11:26 AM HST     0.20 feet Low Tide
Thu -- 04:09 PM HST     0.90 feet High Tide
Thu -- 05:45 PM HST     Sunset
Thu -- 06:34 PM HST     Moonrise
Thu -- 09:40 PM HST     -0.20 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.71.31.92.42.62.62.31.81.30.80.40.20.20.40.60.80.90.80.60.40.1-0.2-0.2-0

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 (13,3,4,5)
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Ground Weather Radar Station Kohala, 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.