West Kaua’i

Tonight: Mostly cloudy. Isolated showers in the evening. Lows around 65 near the shore to around 54 above 3000 feet. Northeast winds up to 10 mph in the evening becoming light. Chance of rain 20 percent.

Thursday: Mostly cloudy. Isolated showers in the afternoon. Highs 77 to 82 near the shore to around 68 above 3000 feet. Light winds becoming southwest up to 10 mph in the afternoon. Chance of rain 20 percent.

Thursday Night: Mostly cloudy with isolated showers. Lows around 65 near the shore to around 54 above 3000 feet. Northeast winds around 10 mph. Chance of rain 20 percent.

South Kaua’i

Tonight: Mostly cloudy. Isolated showers in the evening. Lows around 64. Northeast winds 10 to 15 mph. Chance of rain 20 percent.

Thursday: Mostly cloudy. Isolated showers in the afternoon. Highs 75 to 82. Northeast winds up to 15 mph. Chance of rain 20 percent.

Thursday Night: Mostly cloudy with scattered showers. Lows around 64. Northeast winds around 10 mph. Chance of rain 50 percent.

Kaua’i Mountains

Tonight: Mostly cloudy. Scattered showers in the evening, then isolated showers after midnight. Lows 56 to 63 in the valleys to around 52 above 4000 feet. Northeast winds up to 10 mph. Chance of rain 30 percent.

Thursday: Mostly cloudy. Isolated showers in the morning, then scattered showers in the afternoon. Highs 69 to 75 in the valleys to around 60 above 4000 feet. Northeast winds up to 10 mph. Chance of rain 50 percent.

Thursday Night: Mostly cloudy with scattered showers. Lows 56 to 62 in the valleys to around 52 above 4000 feet. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

North Kaua’i

Tonight: Mostly cloudy. Isolated showers in the evening, then scattered showers after midnight. Lows 58 to 67. East winds up to 10 mph. Chance of rain 30 percent.

Thursday: Mostly cloudy. Scattered showers in the morning, then isolated showers in the afternoon. Highs 70 to 78. Northeast winds up to 10 mph. Chance of rain 30 percent.

Thursday Night: Mostly cloudy with scattered showers. Lows 57 to 67. Northeast winds up to 10 mph. Chance of rain 40 percent.

East Kaua’i

Tonight: Mostly cloudy. Scattered showers in the evening, then isolated showers after midnight. Lows 58 to 69. North winds around 10 mph. Chance of rain 30 percent.

Thursday: Mostly cloudy with isolated showers. Highs 68 to 80. North winds 10 to 15 mph. Chance of rain 20 percent.

Thursday Night: Mostly cloudy with scattered showers. Lows 57 to 69. Northeast winds up to 10 mph. Chance of rain 50 percent.

Detailed Forecast

Update

Winds were increased around the channels and waters around Maui County to better match current observations, resulting in a short-fuse small craft advisory persisting through 6 AM tomorrow morning. Winds will be re-evaluated with the morning package, but overall trends indicate local winds will be decreasing leading into the overnight hours.

Synopsis

A stationary front will remain parked over Maui County through Thursday. This feature is expected to bring periods to showery weather to mainly Maui County and to a lesser extent windward portions of the Big Island and Oahu. More unsettled weather is possible Friday through the weekend for the western islands as a plume of deep moisture develops ahead of another approaching front. Drier weather and improving conditions are forecast by Tuesday as ridging builds across the region.

Aviation

Scattered showers over portions of the area will persist into the overnight with increasing coverage across windward areas. The weakening front will keep chances for MVFR to IFR conditions on Maui, Lanai, and Molokai with isolated thunderstorms possible Thursday morning.
AIRMET Sierra remains in effect for mountain obscuration for Maui, Lanai, and Molokai.
AIRMET Tango remains in effect.

Marine

Strong post-frontal NE winds have weakened considerably this afternoon, giving way to moderate NE winds along and behind the front and gentle to moderate E to SE winds ahead of the front around the Big Island. Gentle to moderate trades hold into Friday night. Winds then veer to southerly over the weekend as a front approaches the western waters. A disturbance aloft could trigger a few heavier showers and possibly thunderstorms during this time.
New medium period NW (310) swell has arrived at the Hanalei PacIOOS Buoy this afternoon and and will continue building into area waters tonight. This swell will quickly peak just shy of the High Surf Advisory threshold tonight and fade during Thursday. Overlapping this swell will be a smaller NNW (340) swell that is forecast to arrive early Thursday peaking Thursday night into early Friday. A sharp downward trend for N shore surf is anticipated during the weekend followed by a large NW swell late Monday night and Tuesday. E shore surf remains below the seasonal average through the week. Surf along S shores remains very small through the period.

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

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Data Courtesy of NOAA.gov