Monday, December9, 2019
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Marine Weather and Tides
Laupahoehoe, 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 6:42AMSunset 5:43PM Monday December 9, 2019 3:50 AM HST (13:50 UTC) Moonrise 4:04PMMoonset 4:23AM Illumination 94% Phase: Waxing Gibbous; Moon at 13 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- 334 Am Hst Mon Dec 9 2019
Today..East winds 10 knots. Wind waves 3 feet. Northwest swell 4 feet and north 4 feet. Isolated showers.
Tonight..Southeast winds 15 knots. Wind waves 3 feet. Northwest swell 6 feet. Isolated showers.
Tuesday..East winds 20 knots. Wind waves 3 feet. Northwest swell 7 feet. Isolated showers in the morning.
Tuesday night..East winds 10 knots. Wind waves 3 feet. Northwest swell 8 feet. Scattered showers through the night.
Wednesday..East winds 10 knots. Wind waves 3 feet. Northwest swell 8 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Wednesday night..East winds 15 knots. Wind waves 3 feet. Northwest swell 10 feet increasing to 13 feet after midnight. Scattered showers.
Thursday..East winds 15 knots. Wind waves 3 to 4 feet. Northwest swell 12 to 14 feet. Scattered showers.
Friday..East winds 15 knots. Wind waves 5 feet. Northwest swell 10 to 12 feet. Scattered showers.
PHZ100 334 Am Hst Mon Dec 9 2019
Synopsis for hawaiian coastal waters.. A weak front just northwest of kauai will then move slowly north as a ridge builds over the area from the east. A new front will approach from the northwest by mid-week with a strong high building behind the front.


7 Day Forecast for Marine Location Near Laupahoehoe, HI
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location: 20.8, -154.34     debug


Area Discussion for -
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FXHW60 PHFO 091346 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 346 AM HST Mon Dec 9 2019

SYNOPSIS. Light easterly winds will continue through the first half of the week as a front stalls and diminishes just north of Kauai. Outside of a few clouds and showers setting up over interior areas each afternoon due to sea breezes, mostly dry and stable conditions are anticipated. Increasing moisture associated with another front that is forecast to move into the area will bring increasing rainfall chances and the potential for gusty northeast winds by the end of the week.

DISCUSSION. Water vapor imagery showed a ridge extending eastward across the region and a potent shortwave trough far northeast of the state driving a cold front toward the west coast. The surface analysis showed the tail-end of this frontal boundary beginning to stretch out from east to west north of Kauai and a weak ridge extending west- southwestward over the islands. Although mostly dry conditions remain in place, some moisture is beginning to bleed out ahead of this boundary near Kauai, which could be enough to trigger a few showers over the adjacent coastal waters of Kauai through the early morning hours today. Elsewhere, mostly dry and clear conditions will prevail due to the drainage flow associated with the early morning land breezes. The exception is over the southeast Big island waters, where isolated to scattered showers have begun to develop due to a passing trough to the south.

The latest short-term (through Tuesday) guidance depicts the aforementioned frontal boundary stalling just north of Kauai today, before retreating northward and diminishing tonight through Tuesday. As this scenario materializes, a return of light trades is expected over the eastern end of the state by Tuesday as the ridge axis shifts back to the north. The land and sea breeze regime, however, remains likely over the western end due to the proximity of this ridge axis. Although dry conditions will prevail, a few clouds and showers setting up over interior areas can't be ruled out each afternoon due to the sea breezes, especially over Kauai where the better source of moisture remains.

For the extended period (Wednesday through the weekend), guidance depicts lowering upper heights associated with a strong short wave trough approaching and moving into the area Wednesday through Friday. Although it remains too far out to determine any specifics due to persistent model differences, increasing moisture and rainfall chances along with gusty northeast winds remain a possibility Wednesday night through Friday as the attendant cold front approaches and moves into the area. Just how far down the island chain and how strong this boundary will be upon arrival will continue to be the main forecast challenge this week.

AVIATION. The light trade wind pattern continues. Expect sea breezes today and land breezes tonight. This forecast period will be relatively dry again through this afternoon. Any showers we have will be isolated. There may be brief periods of MVFR conditions against the slopes but otherwise expect VFR conditions across most of the state.

There are no AIRMETs currently in effect or expected.

MARINE. There are no warnings or advisories in effect for the Hawaii coastal or offshore waters today. A ridge north of the area will maintain light to moderate winds over the area through tomorrow night. Winds will strengthen starting Wednesday as a front moves over the area from the northwest and a strong high builds behind the front.

A new northwest swell now spreading into the area is forecast to product surf above the advisory threshold along north and west facing shores starting this evening and continuing through Wednesday morning. As this swell subsides on Wednesday, a new very large northwest swell is expected. Surf from that swell will produce surf well above warning levels along north and west facing shores of the smaller islands. This swell may be large enough to also produce advisory level surf along west facing shores of the Big Island of Hawaii. The swell is expected to gradually subside through Friday night

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . Gibbs AVIATION . Chevalier MARINE . Donaldson


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 83 mi56 min SSW 1.9 G 4.1 69°F 80°F1013.7 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, HI84 mi57 minSW 610.00 miFair68°F62°F81%1013.8 hPa

Link to 5 minute data for PHTO

Wind History from HTO (wind in knots)
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2 days agoSW3N4NE5S3CalmCalmCalmCalmCalmCalmN6NW5SW5W4W3SW4CalmNW3CalmS3W5SE3S3SW5

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 Hana, Maui Island, Hawaii
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Hana
Click for Map
Mon -- 01:25 AM HST     2.49 feet High Tide
Mon -- 04:30 AM HST     Moonset
Mon -- 06:48 AM HST     Sunrise
Mon -- 07:56 AM HST     0.51 feet Low Tide
Mon -- 12:42 PM HST     1.51 feet High Tide
Mon -- 04:10 PM HST     Moonrise
Mon -- 05:43 PM HST     Sunset
Mon -- 06:30 PM HST     -0.06 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.32.52.42.21.81.30.90.60.50.60.91.21.51.51.310.60.2-0-00.20.61.11.7

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 (8,2,3,4)
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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.