Photo Credit: Jason Weingardt

West Kaua’i

Today: Mostly sunny in the morning, then partly sunny with scattered showers in the afternoon. Highs around 89 near the shore to around 78 above 3000 feet. Northeast winds up to 10 mph. Chance of rain 50 percent.

Tonight: Partly cloudy with isolated showers. Lows around 73 near the shore to around 63 above 3000 feet. Northeast winds up to 10 mph. Chance of rain 20 percent.

Saturday: Mostly sunny in the morning then becoming partly sunny. Scattered showers. Highs 87 to 92 near the shore to around 77 above 3000 feet. East winds up to 15 mph. Chance of rain 50 percent.

South Kaua’i

Today: Mostly sunny. Isolated showers in the morning, then scattered showers in the afternoon. Highs 82 to 90. Northeast winds 10 to 15 mph. Chance of rain 40 percent.

Tonight: Partly cloudy in the evening then becoming mostly cloudy. Scattered showers. Lows around 74. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Saturday: Mostly cloudy with numerous showers in the morning, then mostly sunny with isolated showers in the afternoon. Highs 82 to 90. East winds 10 to 15 mph. Chance of rain 70 percent.

Kaua’i Mountains

Today: Partly sunny with scattered showers. Highs 75 to 87 in the valleys to around 67 above 4000 feet. East winds up to 10 mph. Chance of rain 50 percent.

Tonight: Mostly cloudy. Scattered showers in the evening, then numerous showers after midnight. Lows 65 to 72 in the valleys to around 60 above 4000 feet. East winds up to 15 mph. Chance of rain 70 percent.

Saturday: Partly sunny. Numerous showers in the morning, then scattered showers in the afternoon. Highs 76 to 87 in the valleys to around 68 above 4000 feet. East winds up to 15 mph. Chance of rain 70 percent.

North Kaua’i

Today: Mostly sunny in the morning then becoming partly sunny. Scattered showers. Highs 78 to 89. East winds up to 15 mph. Chance of rain 40 percent.

Tonight: Partly cloudy in the evening then becoming mostly cloudy. Scattered showers. Lows 67 to 74. East winds up to 10 mph. Chance of rain 50 percent.

Saturday: Partly sunny in the morning then becoming mostly sunny. Scattered showers. Highs 78 to 90. East winds up to 15 mph. Chance of rain 50 percent.

East Kaua’i

Today: Mostly sunny with isolated showers in the morning, then partly sunny with scattered showers in the afternoon. Highs 75 to 87. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Tonight: Mostly cloudy with scattered showers. Lows 66 to 77. Northeast winds around 10 mph. Chance of rain 50 percent.

Saturday: Mostly cloudy with scattered showers in the morning, then mostly sunny with isolated showers in the afternoon. Highs 75 to 88. East winds 10 to 15 mph. Chance of rain 50 percent.

Detailed Forecast

Synopsis

Moderate trade winds will prevail through much of next week, with slightly decreasing wind speeds from Sunday onward. Typical trade wind showers will favor windward and mountain zones in the overnight to early morning hours through Saturday morning with drier trends forecast from Saturday night into the first half of next week.

Discussion

The satellite imagery this morning continues to show bands of clouds, associated with a weak disturbance aloft, riding into the windward and mountain slopes of each island on the trade winds. These clouds will produce brief passing showers mainly during the overnight to early morning hours.
A weak high pressure system north of the Hawaiian Islands will continue to produce moderate trade winds into much of next week. The forecast changes over the next seven days will be subtle with a slight decrease in trade wind strength from Sunday onward as the ridge to the north breaks down due to the passage of a cold frontal system. The shower forecast will also see only minor day to day changes with a weak disturbance moving over the island chain in the short term forecast. Expect a brief increase in shower trends from Friday night to early Saturday, then drier conditions are expected to return for the rest of the weekend and into the first half of next week.

Aviation

Moderate to locally breezy trades will continue for the next several days. Low cigs and SHRA will impact windward and mauka areas. Brief MVFR conds can be expected in heavier SHRA but VFR should prevail.
NO AIRMETs currently in effect.

Marine

A weak high pressure system north of the state will maintain gentle to fresh trade winds into next week. The latest forecast wind guidance keeps wind speeds just below Small Craft Advisory thresholds in the channels near Maui and the Big Island. A cold frontal system will move into the Central Pacific basin this weekend, weakening the ridge north of the state. Trade wind speeds will ease slightly from Sunday onward.
The current northwest swell (320 to 330 degrees) will continue to gradually decline today. However, a new small, medium period north-northwest swell (330 to 340 degrees) will build in tonight, providing a small, short lived boost to surf along north and select west facing shores this weekend.
A series of overlapping south and southwest swells will keep south shore surf slightly elevated into early next week. Although the current long period southwest swell and an overlapping tiny short period southwest swell will fade through tonight, another tiny long period southwest (220 degrees) swell will build in by Friday. The next small, long period south-southwest swell (200 degrees) is expected to fill in Monday and then peak from Tuesday into Wednesday.
East facing shores will remain small through early next week due to the lack of strong trades both locally and upstream.

HFO Watches/Warnings/Advisories

None.

Data Courtesy of NOAA.gov