Photo Credit: Sebastien Gabriel

West Kaua’i

Today: Breezy. Mostly sunny with scattered showers early in the morning, then partly sunny with isolated showers in the late morning and afternoon. Highs around 82 near the shore to around 71 above 3000 feet. Northeast winds up to 20 mph. Chance of rain 50 percent.

Tonight: Partly cloudy. Breezy. Isolated showers in the evening, then scattered showers after midnight. Lows around 69 near the shore to around 58 above 3000 feet. Northeast winds up to 20 mph. Chance of rain 50 percent.

Wednesday: Breezy. Mostly sunny with isolated showers. Highs around 82 near the shore to around 71 above 3000 feet. East winds up to 20 mph. Chance of rain 20 percent.

South Kaua’i

Today: Mostly cloudy. Breezy. Numerous showers early in the morning, then scattered showers in the late morning and afternoon. Highs around 79. Northeast winds 15 to 25 mph. Chance of rain 70 percent.

Tonight: Breezy. Mostly cloudy with scattered showers. Lows 64 to 71. Northeast winds 15 to 25 mph. Chance of rain 50 percent.

Wednesday: Partly sunny. Breezy. Numerous showers in the morning, then scattered showers in the afternoon. Highs around 79. Northeast winds 15 to 25 mph. Chance of rain 70 percent.

Kaua’i Mountains

Today: Breezy. Frequent showers early in the morning, then scattered showers in the late morning and afternoon. Highs 70 to 76 in the valleys to around 62 above 4000 feet. East winds 10 to 20 mph decreasing to up to 20 mph in the afternoon. Chance of rain near 100 percent.

Tonight: Mostly cloudy. Breezy. Numerous showers in the evening, then frequent showers after midnight. Lows 57 to 66 in the valleys to around 54 above 4000 feet. East winds up to 20 mph increasing to 10 to 20 mph after midnight. Chance of rain 80 percent.

Wednesday: Mostly cloudy. Breezy. Frequent showers in the morning, then scattered showers in the afternoon. Highs 70 to 76 in the valleys to around 62 above 4000 feet. East winds 10 to 20 mph. Chance of rain 80 percent.

North Kaua’i

Today: Mostly cloudy. Breezy. Numerous showers early in the morning, then scattered showers in the late morning and afternoon. Highs 72 to 82. East winds up to 20 mph increasing to 10 to 20 mph in the afternoon. Chance of rain 70 percent.

Tonight: Mostly cloudy. Breezy. Scattered showers in the evening, then numerous showers after midnight. Lows 61 to 70. East winds up to 20 mph. Chance of rain 70 percent.

Wednesday: Breezy. Partly sunny with scattered showers. Highs 72 to 82. East winds up to 20 mph increasing to 10 to 20 mph in the afternoon. Chance of rain 50 percent.

East Kaua’i

Today: Mostly cloudy. Breezy. Numerous showers early in the morning, then scattered showers in the late morning and afternoon. Highs 71 to 81. Northeast winds 10 to 20 mph. Chance of rain 70 percent.

Tonight: Mostly cloudy. Breezy. Scattered showers in the evening, then numerous showers after midnight. Lows 57 to 72. Northeast winds 10 to 20 mph. Chance of rain 70 percent.

Wednesday: Mostly cloudy. Breezy. Numerous showers in the morning, then scattered showers in the afternoon. Highs 71 to 81. East winds 10 to 20 mph. Chance of rain 70 percent.

Detailed Forecast

Synopsis

Breezy and showery trade wind conditions will continue through Thursday, with clouds and showers favoring windward and mauka locations. Trade winds may ease slightly this weekend as the ridge weakens to the north.

Discussion

Guidance remains in good agreement and depicts the wet trade wind pattern persisting through Thursday as bands of low-level moisture move through. The initial band that has moved in overnight has led to an increase in windward shower coverage, with some spilling over into leeward sections of the smaller islands. Observations at the gauges reflect this uptick in showers with accumulations reaching a quarter to three quarters of an inch with localized higher amounts above two inches over the past six hours. Expect this showery trend to persist through midweek, with the next band approaching from the northeast. The shower coverage should trend down by Friday as this second band moves out and some drier air moves in.
The breezy easterly trades may ease slightly next weekend as the ridge weakens to the north in response to deep low pressure developing far northwest of the state near Midway.

Aviation

Bands of clouds will bring a MVFR cigs/vsbys and SHRA over windward and mauka areas this morning. A few SHRA will make it to leeward sides with lowering cigs/vsbys as well.
AIRMET Sierra is in effect for mtn obsc for all islands.
AIRMET Tango is also in effect for moderate turb below 080 for S and W of all islands.

Marine

High pressure north of the state will slowly drift east and strengthen over the next few days, resulting in fresh to strong trade winds over the islands. A Small Craft Advisory remains in effect for higher winds through Wednesday covering most Hawaiian coastal waters from Oahu to Big Island.
Surf heights along all shores will remain below advisory thresholds through the weekend. A small, medium period northwest swell will arrive late Wednesday and continue through Saturday. Choppy, rough surf expected all week along east facing shores due to the trade winds. South facing shores will continue to see small background swell pulses through rest of the the week.

HFO Watches/Warnings/Advisories

Small Craft Advisory until 6 PM HST Wednesday for Oahu Leeward Waters, Kaiwi Channel, Maui County Windward Waters, Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters.

Data Courtesy of NOAA.gov