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Marine Weather and Tides Koloa, 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

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Sunrise 6:58AM

Sunset 5:51PM

Tuesday December 10, 2019 10:54 PM HST (08:54 UTC)

Moonrise 5:06PM

Moonset 5:41AM

Illumination 100%

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.

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7 Day Forecast for Marine Location Near Koloa, HI

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Area Discussion for -

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FXHW60 PHFO 110633 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 833 PM HST Tue Dec 10 2019

SYNOPSIS. Mostly dry weather and light winds will continue through Wednesday with a stable airmass overhead. A front will be near Kauai on Thursday with increasing shower coverage especially over the west end of the state. Moisture from the front will become focused over the windward and mauka areas Friday as trades begin to strengthen, with drier weather over the weekend.

DISCUSSION. No significant changes are expected to the forecast tonight. Lighter winds for the next 24 hours or so will continue with a stable airmass overhead limiting clouds and showers. A front approaching from the northwest will bring increasing clouds and showers to the western end of the island chain on Thursday.

High pressure building north of the front will help to wash the front out by Friday, and bring building trade winds to the region. Moisture left over from the front will then ride in on the trades, bringing a wet trade wind pattern to the windward and mauka areas.

There are some differences in the models over the weekend for the upper levels. Both the GFS and ECMWF show an upper level trough northwest of Kauai on Friday. The ECMWF brings the upper level trough down the island chain and weakens it through the weekend. Meanwhile the GFS shows an upper level low forming at the southern base of the trough on Saturday, to the southwest of the islands. After the upper low forms, the remainder of the upper trough near the islands washes out. This upper level feature could have an impact on the amount and intensity of the showers moving over the islands over the weekend. Will be taking a closer look at the model runs that come in overnight before making any changes to the current forecast.

AVIATION. With a weak background flow from the east, nighttime land breezes and daytime sea breezes will develop over the much of the state through Wednesday. This will lead to some cloud buildups over island interiors in the afternoons and evenings with little in the way of showers expected, then clearing out overnight. VFR will dominate over most areas.

MARINE. A current mix of a east-southeast to east wind flow will become more of a trade wind flavor area-wide on Wednesday. Strength will be pretty much light to moderate as the surface ridge some 225 nm N of Kauai edges slightly northward. There is a old frontal boundary just S of the ridge, some 125 nm N of Kauai that will continue to fall apart as the night progresses. A new front, though, some 480 nm NW of Kauai will be weakening as it moves eastward. This front will enter the far NW offshore waters Wednesday afternoon and stalls just outside the nearshore waters of NW Kauai Thursday night. NE 15 to 25 kt winds lies just to the west of this front, and in due course in the following 24 hours, into early Friday morning, it will build to gale force strength across our SW through NW and N offshore waters. The gale force winds will last through Friday, then easing slightly to NE 20 to 30 kt winds across the aforementioned areas, as the front weakens to a trough Friday night while drifting west, away from the islands over the weekend. The waters around Kauai and Niihau, Oahu's windward waters may be grazed with some small craft level winds of 23 kt or more Thursday night and Friday. SCA level trades then shifts over to waters around Maui County and waters south of the Big Island on Friday. A new high is slated to pass north of the islands early next week, thus maintaining the SCA.

The northwest swell will hold around similar heights through tonight then rise significantly on Wednesday. Deep ocean buoy 51101, northwest of Kauai, has a 10 foot swell at 15 seconds this hour, which is pretty much in line with WW3, while the Waimea PacIOOS buoy has a reading of 8 foot wave height and 14 second period. Border line advisory surf is expected to continue across most north and west facing shores from Kauai to Maui tonight, followed by a significant rise in swell Wednesday and Wednesday night. A High Surf Warning has been posted for this rise, even though warning level surf is not expected until afternoon on Kauai and Oahu and on Molokai and Maui until evening. The large surf will peak early Thursday then decline below the advisory level late Friday. Another pulse of northwest swell may produce advisory level surf early next week.

Due to the weak trades, surf along east facing shores will continue below seasonal average for another 24 hour or so. A boost in the trades Thursday night and Friday, will likely lead to higher surf along the east facing shores of all islands, but especially for Kauai and Oahu. Waters will turn particularly very rough and choppy around Kauai as discussed above. The trade swell will gradually back down over the weekend as the trade wind eases. A Small Craft Advisory (SCA) in effect for the building seas to 10 feet or higher the rest of tonight and Wednesday. The SCA covers waters around Kauai and north of Oahu tonight, then expands to most waters exposed to the northwest swell on Wednesday. The SCA will likely be expanded to cover waters around Maui County and waters south of the Big Island for locally strong trades Thursday night or Friday. Given the outlook described above, expect this SCA, due to locally strong trades, to likely continue through the weekend and into early next week.

HFO WATCHES/WARNINGS/ADVISORIES. High Surf Warning from noon Wednesday to 6 PM HST Thursday for Niihau-Kauai Windward-Kauai Leeward-Waianae Coast-Oahu North Shore-Oahu Koolau-Olomana-Molokai-Maui Windward West-Maui Central Valley-Windward Haleakala.

Small Craft Advisory from 6 AM Wednesday to 6 PM HST Thursday for Oahu Leeward Waters-Kaiwi Channel-Maui County Windward Waters-Big Island Windward Waters.

Small Craft Advisory from midnight tonight to 6 PM HST Thursday for Kauai Northwest Waters-Kauai Windward Waters-Kauai Leeward Waters-Kauai Channel-Oahu Windward Waters.



DISCUSSION . M Ballard AVIATION . TS MARINE . H Lau

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Weather Reporting Stations

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Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
NWWH1 - 1611400 - Nawiliwili, HI	8 mi	61 min	WSW 4.1 G 5.1	71°F			1018.2 hPa
51201 - Waimea Bay, HI (106)	74 mi	49 min			77°F	9 ft

Wind History for Nawiliwili, HI

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
Lihue, Lihue Airport, HI	9 mi	62 min	WNW 6	10.00 mi	Fair	73°F	69°F	87%	1018.1 hPa
Kekaha, Pacific Missile Test Facility Barking Sands, HI	20 mi	59 min	E 3	10.00 mi	Fair	72°F	64°F	79%	1017.7 hPa

Link to 5 minute data for PHLI

Wind History from HLI (wind in knots)

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Tide / Current Tables for Port Allen, Hanapepe Bay, Kauai Island, Hawaii

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Tide / Current Tables for Nawiliwili, Hawaii (2)

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Weather Map

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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

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Wind Forecast for (3,6,7,8)

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Ground Weather Radar Station Kauai, HI

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