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Marine Weather and Tides Koloa, HI Version 3.4

NOTICE 1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17. 1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

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Sunrise 6:05AM

Sunset 6:55PM

Thursday April 22, 2021 4:44 PM HST (02:44 UTC)

Moonrise 2:52PM

Moonset 3:17AM

Illumination 85%

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 230135 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 335 PM HST Thu Apr 22 2021

SYNOPSIS. Moderate to breezy easterly trade winds will persist through the weekend, with clouds and showers favoring windward and mountain locations. Windward shower coverage could increase late Friday through Saturday night as an upper low moves through from north to south. Warm and humid conditions may return early next week as the trade winds diminish in response to a front passing far to the north.

DISCUSSION. The surface trough near Kauai that disrupted trade winds through the first half of the week will continue retreating westward away from the area through Friday. Easterly trade winds will continue to fill in from east to west as high pressure builds to the north, establishing a stable trade wind regime into Friday. Showers will favor windward and mountain locations, with the best coverage likely through the overnight and early morning periods.

Windward showers may increase late Friday through Saturday night as an upper low drops southward into the area. Some showers could reach leeward locations as the inversion weakens and the trades become breezy. In addition to the increasing shower coverage, a thunderstorm or two can't be ruled out over the Big Island slopes through the afternoon hours Friday and Saturday.

Models show the upper low briefly drifting south of the state Sunday through Sunday night, then lifting back through the area and merging with an upper trough passing to the north Monday through Tuesday. The subtropical ridge will weaken once again as a front passes to the north. If this scenario evolves, a land and sea breeze regime, with warm and humid conditions, will return and continue through the first half of next week. Clouds and showers will shift back over interior and leeward locations through the afternoon hours.

AVIATION. Trade winds will strengthen across the state through Friday. VFR conditions will prevail through midnight with brief/isolated mountain obscurations over the windward slopes. Increasing clouds and showers is anticipated for the windward side of the Big Island after midnight as upstream moisture tracks in with the trade wind flow. No AIRMETs are in effect, but may be needed for the Big Island later on tonight.

An upper low will move south over Hawaii on Friday and may boost clouds and showers around the state.

MARINE. A surface high passing north of the islands will boost trade winds into the fresh to locally strong range through the weekend. A small craft advisory is in effect for the windier waters around Maui County and the Big Island. Winds are expected to trend down next week as the high weakens.

A northwest swell is bringing moderate surf along north and west facing shores. This swell will decline through Friday. A small west northwest swell is possible next week with a source from a long lived distant typhoon. A small short period northwest pulse may arrive next Thursday.

Small, long period swell from the southern hemisphere will maintain small surf along south facing shores. Expect east shore surf to build to small to moderate heights over the weekend, and then diminish Monday.

HFO WATCHES/WARNINGS/ADVISORIES. Small Craft Advisory until 6 AM HST Sunday for Maalaea Bay- Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big Island Southeast Waters.



DISCUSSION . Powell AVIATION . Foster MARINE . Morrison

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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	56 min	ENE 8.9 G 14	77°F	81°F
51201 - Waimea Bay, HI (106)	74 mi	47 min			77°F	6 ft

Wind History for Nawiliwili, HI

(wind in knots)    EDIT      (on/off)   Help

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SE3 G7

W2 G5

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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	51 min	ENE 9	10.00 mi	A Few Clouds	79°F	67°F	67%	1016.5 hPa
Kekaha, Pacific Missile Test Facility Barking Sands, HI	20 mi	53 min	NW 6	10.00 mi	Overcast	82°F	67°F	60%	1015.7 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: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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Ground Weather Radar Station

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