West Kaua’i

Tonight: Partly cloudy with isolated showers. Lows around 66 near the shore to around 56 above 3000 feet. Northeast winds up to 10 mph. Chance of rain 20 percent.

Friday: Sunny. Isolated showers in the morning. Highs around 80 near the shore to around 67 above 3000 feet. Northeast winds up to 15 mph. Chance of rain 20 percent.

Friday Night: Partly cloudy. Lows around 65 near the shore to around 54 above 3000 feet. Northeast winds 10 to 15 mph.

South Kaua’i

Tonight: Mostly cloudy with scattered showers. Lows around 65. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Friday: Breezy. Partly sunny with scattered showers in the morning, then sunny with isolated showers in the afternoon. Highs 74 to 81. Northeast winds 10 to 20 mph. Chance of rain 40 percent.

Friday Night: Partly cloudy. Breezy. Isolated showers in the evening, then scattered showers after midnight. Lows around 64. Northeast winds 10 to 20 mph. Chance of rain 30 percent.

Kaua’i Mountains

Tonight: Mostly cloudy with occasional showers. Lows 58 to 64 in the valleys to around 53 above 4000 feet. Northeast winds up to 15 mph. Chance of rain 90 percent.

Friday: Partly sunny in the morning then becoming mostly sunny. Scattered showers. Highs 68 to 74 in the valleys to around 59 above 4000 feet. Northeast winds up to 15 mph. Chance of rain 50 percent.

Friday Night: Mostly cloudy with scattered showers. Lows 56 to 63 in the valleys to around 52 above 4000 feet. Northeast winds up to 15 mph. Chance of rain 50 percent.

North Kaua’i

Tonight: Mostly cloudy with numerous showers. Lows 59 to 67. Northeast winds up to 15 mph. Chance of rain 70 percent.

Friday: Mostly sunny. Breezy. Scattered showers in the morning, then isolated showers in the afternoon. Highs 70 to 79. Northeast winds up to 15 mph increasing to 10 to 20 mph in the afternoon. Chance of rain 50 percent.

Friday Night: Breezy. Mostly cloudy with scattered showers. Lows 58 to 66. Northeast winds up to 20 mph. Chance of rain 40 percent.

East Kaua’i

Tonight: Mostly cloudy with numerous showers. Lows 60 to 69. North winds 10 to 15 mph. Chance of rain 70 percent.

Friday: Partly sunny with scattered showers in the morning, then mostly sunny with isolated showers in the afternoon. Highs 67 to 79. North winds 10 to 15 mph. Chance of rain 50 percent.

Friday Night: Partly cloudy with isolated showers in the evening, then mostly cloudy with scattered showers after midnight. Lows 58 to 68. North winds 10 to 15 mph. Chance of rain 50 percent.

Detailed Forecast

Synopsis

A drier and more stable trade wind pattern is expected into at least the middle of next week. Showers should be mostly focused along windward and mauka locations through the period. Nights will be cool in sheltered areas this weekend.

Discussion

Light trade wind showers were detected by radar this morning along windward and mauka areas. Satellite shows typical clouds expected for a trade wind pattern. Winds will continue to ease today before picking back up slightly through the weekend as a weak front moves through. This front will bring another shot of dry air to the region. Lowering dewpoints through Monday should allow for cool nights in most areas. Another plus from the dry air will be enhanced evaporation, helping to eliminate standing water from the recent flooding and perhaps aid in cleanup.

Aviation

Mostly dry and stable conditions with moderate northeast trade winds will prevail across the island chain over the next 24 h. Brief periods with MVFR CIGS/VSBYS are possible in passing showers, mainly for windward sites.

Marine

A low pressure system northeast of the islands and a high pressure system to the far northwest of the Hawaii region will keep northeasterly trade winds in the forecast through the week. Wind speeds will briefly ease through Friday, and the Small Craft Advisory was cancelled this morning. Fresh to strong trade winds bring a return of SCA conditions from Saturday into the first half of next week as high pressure builds north of the state.
A medium period swell will peak around 3 feet today before gradually declining through the weekend. For east facing shores, short period wind wave energy from northeasterly trade winds will hold into the weekend. Strengthening northeasterly winds this weekend and a swath of gales associated with a low around one thousand miles northeast of the islands will lead to the potential for high surf advisories along north and east facing shores from Sunday into early next week.
For south facing shores, small background energy pulses will keep surf heights above flat conditions into early next week.

HFO Watches/Warnings/Advisories

None.

Data Courtesy of NOAA.gov