Friday, December13, 2019
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Marine Weather and Tides
Nanawale Estates, 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 Friday December 13, 2019 11:04 AM HST (21:04 UTC) Moonrise 7:29PMMoonset 8:11AM Illumination 95% Phase: Waning Gibbous; Moon at 17 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- 945 Am Hst Fri Dec 13 2019
.small craft advisory in effect through early Saturday morning...
Rest of today..East winds 20 knots. Wind waves 6 feet. Northwest swell 9 feet and east 3 feet. Scattered showers, then isolated showers in the afternoon.
Tonight..East winds 20 knots. Wind waves 6 feet. Northwest swell 7 feet and east 3 feet. Isolated showers in the evening, then scattered showers after midnight.
Saturday..East winds 20 knots. Wind waves 6 feet. Mixed swell northwest 5 feet and northeast 4 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Saturday night..East winds 15 knots. Wind waves 6 feet. Mixed swell northwest 5 feet and northeast 4 feet. Isolated showers in the evening, then scattered showers after midnight.
Sunday..East winds 15 knots. Wind waves 6 feet. Northwest swell 4 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Sunday night..Northeast winds 15 knots. Wind waves 5 feet. Northwest swell 4 feet. Scattered showers.
Monday..East winds 20 knots. Wind waves 6 feet. Northwest swell 6 to 8 feet. Scattered showers.
Tuesday..East winds 20 knots. Wind waves 6 feet. Northwest swell 7 to 9 feet. Scattered showers.
PHZ100 945 Am Hst Fri Dec 13 2019
Synopsis for hawaiian coastal waters.. High pressure will keep locally strong trade winds across the coastal waters through Saturday. A slight decline in trades is possible Sunday, before a new high builds north of the area and trades return to locally strong speeds by early next week. The current northwest swell will subside through Saturday, with another large northwest swell forecast for the beginning of next week.


7 Day Forecast for Marine Location Near Nanawale Estates, HI
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location: 19.49, -154.81     debug


Area Discussion for -
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FXHW60 PHFO 132011 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 1011 AM HST Fri Dec 13 2019

SYNOPSIS. Breezy to locally windy trade winds are expected today as strong high pressure passes well to our north. The trades will bring rainfall to mostly windward and mauka locales, with a few showers briefly reaching leeward. The high level jet stream will bring increasing high clouds later today into tonight. Trade winds will decrease during the weekend as the high moves away. A dry, stable airmass will take control of our weather this weekend and the first half of next week, with few showers and considerable sunshine. A new high passing far to the north will return locally windy trades Monday and Tuesday.

DISCUSSION. The stationary front that was just NW of Kauai is beginning to retreat westward away from the islands as a surface trough. This is allowing breezy to locally windy trades to return as a surface high passes about 900 miles N of the islands today. An upper trough just W of the islands has been helping to reinforce the front, and enhance incoming trade wind showers. The upper trough is expected to weaken as we head into the weekend, which will result in fewer and less intense showers. High level moisture riding in on the subtropical jet will continue to bring high clouds at times, and these will increase tonight into Saturday before pushing away later Saturday as the jet shifts to the SE of the islands.

The surface high to the N will continue eastward into the weekend, so trade wind speeds on Saturday will be a notch below today's levels. Winds will even be a notch lower on Sunday as a col between two highs passes N of the islands. The next surface high will pass well N of the islands on Monday, returning breezy to locally windy trade wind speeds for Mon and Tue. The winds should ease Wed, but may increase again on Thu as the next in the series of highs passing to the N approaches our longitude.

Trade wind showers are expected to continue to decrease as we head into the weekend, with decreasing precipitable water and warming mid-level temperatures. A strong 700 mb high just to our N will bring warm mid-level air early next week. This, combined with a lack of moisture, should yield a significant minimum in trade wind showers Tue and Wed, with nice fine weather expected. Showers may increase again Thu as the mid-level high moves away and the airmass becomes a bit more unstable again.

AVIATION. An area of enhanced moisture continues to reside over the islands this morning in a association with a dissipating front. Greatest coverage of showers will remain over mainly interior/windward areas of Oahu and Kauai as well as windward areas of the remaining islands. Brief MVFR conditions and mountain obscuration may occur due to the passing showers.

Surface high pressure to the northeast of the state will allow for moderate to occasionally breezy easterly trades to persist through the period.

No AIRMETs are currently in effect.

MARINE. The current northwest swell will continue to subside from west to east over the next few days. The High Surf Advisory remains posted for north and west facing shores of Kauai County, Oahu, and Molokai and north facing shores of Maui. Surf is expected to fall below advisory levels by early tomorrow morning. A short period north-northeast swell will increase surf along exposed east facing shores, mainly on Kauai and Oahu, today and tonight, but should stay just below the advisory levels.

A reinforcing large northwest swell is forecast to build late Sunday into Monday and peak Monday night, possibly near warning levels. This swell should slowly decline Tuesday into Wednesday, but will likely be reinforced by another large northwest swell Wednesday night into Thursday.

A high pressure north of the state will keep moderate to locally strong trade winds over the area through Saturday. The combination of the current northwest swell and the strong trade winds is resulting in a Small Craft Advisory for all coastal waters, except the Maui leeward waters. This Small Craft configuration is expected to be trimmed down to mainly the locally windier waters around the Big Island and Maui County by tomorrow morning as the swell subsides.

A slight decline in trade winds and period without Small Craft conditions is possible Sunday as the current high moves east and a new high builds north. Trade winds should return to moderate to locally strong speeds by early next week and seas will build with the reinforcing northwest swell.

HFO WATCHES/WARNINGS/ADVISORIES. High Surf Advisory until 6 AM HST Saturday for N and W facing shores of Niihau, Kauai, Oahu, Molokai, and N facing shores of Maui.

Small Craft Advisory until 6 AM HST Saturday for all Hawaiian Coastal Waters except for Maui County Leeward Waters.



DISCUSSION . R Ballard AVIATION . Thomas MARINE . EATON


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 21 mi53 min W 5.1 G 6 76°F 80°F1018.9 hPa
51206 22 mi49 min 79°F9 ft

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, HI21 mi72 minW 810.00 miFair77°F70°F79%1019.1 hPa

Link to 5 minute data for PHTO

Wind History from HTO (wind in knots)
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2 days agoSE6E8E9SE7E9E7SE4S3SW4S3S4SW4SW6W8W7W5SW5SW5SW6SW6S3W7W7SE5

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 Honuapo, Hawaii Island, Hawaii
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Honuapo
Click for Map
Fri -- 04:38 AM HST     2.93 feet High Tide
Fri -- 06:46 AM HST     Sunrise
Fri -- 08:13 AM HST     Moonset
Fri -- 12:11 PM HST     0.36 feet Low Tide
Fri -- 04:25 PM HST     1.20 feet High Tide
Fri -- 05:46 PM HST     Sunset
Fri -- 07:32 PM HST     Moonrise
Fri -- 09:54 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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0.81.42.12.62.92.92.72.31.81.20.80.50.40.40.711.21.210.70.40.100.2

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 (16,3,4,5)
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Ground Weather Radar Station South Shore, 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.