Saturday, December7, 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 6:41AMSunset 5:42PM Saturday December 7, 2019 4:06 AM HST (14:06 UTC) Moonrise 2:53PMMoonset 2:43AM Illumination 81% Phase: Waxing Gibbous; Moon at 11 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- 344 Am Hst Sat Dec 7 2019
.small craft advisory in effect through early Sunday morning...
Today..Southeast winds 15 knots. Wind waves 4 feet. North swell 8 feet. Isolated showers.
Tonight..Southeast winds 15 knots. Wind waves 3 feet. North swell 8 feet. Scattered showers in the evening, then isolated showers after midnight.
Sunday..Southeast winds 10 knots in the morning becoming variable less than 10 knots. Wind waves 3 feet. North swell 7 feet. Isolated showers.
Sunday night..East winds 10 knots. Wind waves 3 feet. North swell 5 feet and north 5 feet. Isolated showers through the night.
Monday..East winds 10 knots. Wind waves 4 feet. Northwest swell 6 feet. Isolated showers.
Monday night..East winds 10 knots. Wind waves 4 feet. Northwest swell 8 feet. Scattered showers.
Tuesday..East winds 15 knots. Wind waves 4 to 5 feet. Northwest swell 8 to 9 feet. Scattered showers.
Wednesday..Southeast winds 15 knots. Wind waves 3 to 4 feet. Northwest swell 11 to 13 feet. Scattered showers.
PHZ100 344 Am Hst Sat Dec 7 2019
Synopsis for hawaiian coastal waters.. A surface ridge will move over the island chain today, then remain nearly stationary through Sunday. The ridge will drift north early next week as a weakening front stalls near kauai. Strong high pressure will build northwest of the area on Wednesday.


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 071355 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 355 AM HST Sat Dec 7 2019

SYNOPSIS. A drier more stable airmass is moving over the islands with light winds through the weekend. A weak front will stall near Kauai early next week and high pressure will pass by far north of the area. Light to moderate trades can be expected early next week. Another front will approach the area around Thursday with increased shower activity.

DISCUSSION. Several changes/tweaks have been made to the forecast this morning. Cleared out sky and lowered pops for this morning based on overnight satellite and latest model guidance. Also made more minor modifications to the PoPs and associated grids for Sunday night through Tuesday or so. Winds were generally lowered for Sunday through Wednesday based on the last few model runs indicating that winds won't be as strong behind the front expected to stall near Kauai early next week.

With the shortwave off to the east, and high pressure far to the northeast, the pressure gradient over the islands is weakening. With high pressure to the northeast, we can expect trade winds today, however as the high moves to the east, further weakening the pressure gradient will result in lighter winds. The lighter winds will bring land and sea breezes. A stable airmass overhead will minimize rainfall totals, which will be concentrated to the afternoon and evening hours.

The southern end of a weakening front will approach Kauai Sunday night and Monday, which will bring an uptick in showers mostly to the Garden Isle. High pressure passing to the north will maintain a trade wind flow, so expect some lingering moisture from the front to ride in on the trades early next week. As the high moves to the northeast, look for winds to weaken again Tuesday and Wednesday.

The models continue to show a stronger front approaching the islands Thursday and Friday. Some model differences remain, but expect increased shower activity with the front, and strong northerly winds for a brief time behind the front, before trades build back in.

AVIATION. Northeast tradewinds are expected today with a weakening of the wind speeds. This should lead to a daytime sea breeze-nighttime land breeze scenario for most areas. Any showers we have through this forecast period should be confined to the windward slopes. Since we are only expecting relatively brief MVFR conditions on the windward slopes and the winds will be weaker, we are not anticipating any AIRMETs through this forecast period.

MARINE. Expect trade winds to diminish today, and remain light E-SE through the weekend, as an E-W oriented surface ridge moves S over the island chain. The ridge will drift N early next week as a weakening front stalls near Kauai, bringing light to moderate trade winds until mid-week. A stronger high building NW of the area is expected to bring strong NE winds Wednesday into Thursday. Winds are expected to remain below Small Craft Advisory (SCA) criteria until then, but combined seas are expected to reach 10 to 11 feet in many zones through tonight, and a SCA has been posted. Otherwise, seas will likely reach SCA criteria in many zones Tuesday and Wednesday as large NW swells arrive.

A long-period NNE swell is expected to build today, peak tonight, and gradually diminish Sunday and Monday. A High Surf Warning has been issued for E facing shores (where criteria are lower than N facing shores), and a High Surf Advisory is now in effect for N facing shores. The NE swell energy will diminish early next week, but overlapping swells from the NNW/NW will likely bring high surf to N and W facing shores for much of next week, with warning level surf anticipated Wednesday/Thursday.

See the Oahu Surf Discussion (SRDHFO) for details on the sources of the swells arriving in island waters.

HFO WATCHES/WARNINGS/ADVISORIES. High Surf Warning until 6 AM HST Sunday for Kauai Windward-Oahu Koolau-Olomana-Molokai Windward-Maui Windward West-Windward Haleakala-Big Island North and East.

High Surf Advisory until 6 AM HST Sunday for Niihau-Oahu North Shore-Molokai Leeward-Maui Central Valley.

Small Craft Advisory until 6 AM HST Sunday for Kauai Northwest Waters-Kauai Windward Waters-Kauai Channel-Oahu Windward Waters- Kaiwi Channel-Maui County Windward Waters-Alenuihaha Channel-Big Island Windward Waters-Big Island Southeast Waters.



DISCUSSION . M Ballard AVIATION . Chevalier MARINE . Birchard


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 0 mi49 min SSW 1.9 G 2.9 68°F 80°F1012.7 hPa
51206 6 mi51 min 78°F9 ft
KWHH1 46 mi55 min NE 5.1 G 5.1 70°F 80°F1011.4 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 mi74 minSSW 310.00 miOvercast68°F64°F90%1012.9 hPa

Link to 5 minute data for PHTO

Wind History from HTO (wind in knots)
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Last 24hrSW3N4NE5S3CalmCalmCalmCalmCalmCalmN6NW5SW5W4W3SW4CalmNW3CalmS3W5SE3S3SW5
1 day ago4NW5NW5CalmSW3CalmW5S4CalmN9CalmW7SW5SW5SW6SE4W4SW3SW4S4SW3W4CalmSW4
2 days agoS4SW5CalmCalmE6S5W53N6SW6W5SW3W3CalmSW4SW3SW3SW4CalmS3SW6W6W9SE3

Tide / Current Tables for Hilo, Hawaii Island, Hawaii
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Hilo
Click for Map
Sat -- 12:30 AM HST     2.09 feet High Tide
Sat -- 02:43 AM HST     Moonset
Sat -- 06:38 AM HST     0.79 feet Low Tide
Sat -- 06:42 AM HST     Sunrise
Sat -- 11:31 AM HST     1.71 feet High Tide
Sat -- 02:52 PM HST     Moonrise
Sat -- 05:41 PM HST     Sunset
Sat -- 06:00 PM HST     0.15 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.12.11.91.61.310.80.811.21.51.71.71.51.30.90.50.30.20.30.511.51.9

Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Kawaihae
Click for Map
Sat -- 01:30 AM HST     1.73 feet High Tide
Sat -- 02:47 AM HST     Moonset
Sat -- 06:45 AM HST     Sunrise
Sat -- 07:34 AM HST     0.70 feet Low Tide
Sat -- 12:40 PM HST     1.33 feet High Tide
Sat -- 02:55 PM HST     Moonrise
Sat -- 05:43 PM HST     Sunset
Sat -- 07:01 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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1.61.71.71.61.31.10.80.70.70.811.21.31.31.210.70.40.100.10.40.81.2

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (9,2,3,4)
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Ground Weather Radar Station Kohala, HI
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Disclaimer:
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.