West Kaua’i

Tonight: Partly cloudy with isolated showers. Lows 72 to 77 near the shore to around 64 above 3000 feet. East winds up to 10 mph. Chance of rain 20 percent.

Friday: Mostly sunny with isolated showers. Highs 87 to 92 near the shore to around 78 above 3000 feet. East winds up to 15 mph. Chance of rain 20 percent.

Friday Night: Partly cloudy with isolated showers. Lows around 74 near the shore to around 62 above 3000 feet. East winds up to 15 mph. Chance of rain 20 percent.

South Kaua’i

Tonight: Mostly cloudy with scattered showers. Lows around 76. East winds 10 to 15 mph. Chance of rain 50 percent.

Friday: Partly sunny with scattered showers in the morning, then mostly sunny with isolated showers in the afternoon. Highs 83 to 91. East winds 10 to 15 mph. Chance of rain 50 percent.

Friday Night: Mostly cloudy with scattered showers. Lows around 75. East winds 10 to 15 mph. Chance of rain 40 percent.

Kaua’i Mountains

Tonight: Mostly cloudy with scattered showers. Lows 66 to 72 in the valleys to around 61 above 4000 feet. East winds up to 15 mph. Chance of rain 50 percent.

Friday: Breezy. Partly sunny with scattered showers. Highs 77 to 86 in the valleys to around 68 above 4000 feet. East winds up to 20 mph. Chance of rain 50 percent.

Friday Night: Mostly cloudy with scattered showers. Lows 65 to 71 in the valleys to around 61 above 4000 feet. East winds up to 15 mph increasing to 10 to 15 mph after midnight. Chance of rain 50 percent.

North Kaua’i

Tonight: Mostly cloudy with isolated showers in the evening, then partly cloudy with scattered showers after midnight. Lows 67 to 75. Southeast winds up to 10 mph. Chance of rain 40 percent.

Friday: Partly sunny with scattered showers in the morning, then mostly sunny with isolated showers in the afternoon. Highs 79 to 89. East winds up to 15 mph. Chance of rain 50 percent.

Friday Night: Partly cloudy with scattered showers. Lows 66 to 75. East winds up to 15 mph. Chance of rain 40 percent.

East Kaua’i

Tonight: Mostly cloudy with scattered showers. Lows 67 to 79. East winds up to 10 mph. Chance of rain 50 percent.

Friday: Partly sunny in the morning then becoming mostly sunny. Scattered showers. Highs 75 to 88. East winds 10 to 15 mph. Chance of rain 50 percent.

Friday Night: Mostly cloudy with scattered showers. Lows 66 to 78. East winds 10 to 15 mph. Chance of rain 50 percent.

Detailed Forecast

Synopsis

High pressure centered northeast of Hawaii will drive moderate to fresh trade winds into next week. An area of moisture will bring some windward showers overnight with a drying trend expected Friday to Monday.

Discussion

High pressure centered northeast of Hawaii will drive moderate to fresh trade winds into next week. Visible satellite and radar show the clouds and showers that tracked across windward Big Island this morning are becoming a bit more diffuse through the afternoon, but upstream moisture will continue to track in from upstream keeping showers in the forecast for tonight along windward portions of Maui and the Big Island. A few low clouds and showers linger across the rest of the state, but not amounting to much accumulation. Aloft, upper level troughing to the west is pushing in high clouds across the western half of the area and keeping a fairly weak and elevated inversion over the state.
Upper ridging will push in from the east, while the remnant low level moisture passes to the west. Expect a drying trend for Friday through the weekend and Monday. A tropical wave will pass south of the state Tuesday and Wednesday. Long range guidance shows some moisture along the far northern periphery of the wave getting caught in the trade wind flow and pushed across the island chain. Clouds and showers will likely increase during this time frame focusing over windward and mauka areas.

Aviation

Moderate to locally breezy trade winds will gradually and slightly increase tomorrow as high pressure to the northeast remains in place. Showers will favor windward and mountain areas as well as the night time and early morning hours. MVFR conditions can be expected in any showers but overall VFR conditions will prevail.
No AIRMETs are in effect. AIRMET Sierra for mountain obscuration over select windward areas is possible tonight. Also there is the potential for AIRMET Tango if wind speeds increase.

Marine

High pressure will build far northeast of the state and remain nearly stationary through this weekend. As the remnants of Post- Tropical Cyclone Kiko exit the region, gentle to locally fresh trade winds have returned to Hawaiian coastal waters. Trades are expected to strengthen slightly from tonight onward to become locally strong. Therefore, a Small Craft Advisory (SCA) has been issued for the typically windy channels and waters of Maui County and the Big Island. This SCA will remain in effect through at least the first half of the weekend.
Despite the current south swell slowly declining today, another small, medium to long period south swell will fill in on Friday to provide another slight bump in south shore surf. This swell will then then slowly decline over the weekend. Additionally, surf along north facing shores will remain slightly elevated over the next couple of days as another small northwest pulse arrives on Friday. East facing shores will see typical trade wind generated energy throughout the forecast period.

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.

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