West Kaua’i

Tonight: Partly cloudy with isolated showers. Lows around 74 near the shore to around 64 above 3000 feet. Northeast winds up to 10 mph. Chance of rain 20 percent.

Tuesday: Mostly sunny in the morning then becoming partly sunny. Isolated showers. Highs 84 to 91 near the shore to around 77 above 3000 feet. North winds up to 10 mph shifting to the southwest in the afternoon. Chance of rain 20 percent.

Tuesday Night: Mostly cloudy with isolated showers. Lows around 74 near the shore to around 65 above 3000 feet. East winds up to 10 mph. Chance of rain 20 percent.

South Kaua’i

Tonight: Partly cloudy. Isolated showers in the evening, then scattered showers after midnight. Lows around 74. Northeast winds 10 to 15 mph. Chance of rain 40 percent.

Tuesday: Partly sunny with scattered showers. Highs 80 to 89. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Tuesday Night: Mostly cloudy with scattered showers. Lows around 74. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Kaua’i Mountains

Tonight: Mostly cloudy with scattered showers. Lows around 69 in the valleys to around 61 above 4000 feet. East winds up to 10 mph. Chance of rain 50 percent.

Tuesday: Mostly cloudy. Numerous showers in the morning, then scattered showers in the afternoon. Highs 74 to 81 in the valleys to around 67 above 4000 feet. East winds up to 10 mph. Chance of rain 70 percent.

Tuesday Night: Mostly cloudy. Scattered showers in the evening, then numerous showers after midnight. Lows around 69 in the valleys to around 62 above 4000 feet. East winds around 10 mph. Chance of rain 70 percent.

North Kaua’i

Tonight: Partly cloudy with scattered showers. Lows 65 to 75. East winds up to 15 mph. Chance of rain 40 percent.

Tuesday: Partly sunny with scattered showers. Highs 71 to 87. East winds up to 15 mph. Chance of rain 50 percent.

Tuesday Night: Mostly cloudy with scattered showers. Lows 65 to 75. East winds up to 10 mph. Chance of rain 50 percent.

East Kaua’i

Tonight: Partly cloudy in the evening then becoming mostly cloudy. Scattered showers. Lows 68 to 76. Northeast winds around 10 mph. Chance of rain 50 percent.

Tuesday: Partly sunny with scattered showers. Highs 77 to 86. Northeast winds around 10 mph. Chance of rain 50 percent.

Tuesday Night: Mostly cloudy with scattered showers. Lows 68 to 76. Northeast winds around 10 mph. Chance of rain 50 percent.

Detailed Forecast

Synopsis

Trade winds will remain light to moderate through much of the week as the remnant circulation of Tropical Cyclone Genevieve lingers far NE of the islands. Clouds and showers will favor windward and mauka areas and may be a little more frequent for the western half of the state this week due to an upper level trough. Trade winds then look to increase this weekend.

Discussion

High pressure north of the area is driving moderate trade winds which are delivering light showers to mostly windward and mountain areas. Former Tropical Cyclone Genevieve resides to the far NE where it is currently drifting W and will likely contribute to decreasing the trade winds tomorrow through Thursday. Also by tomorrow, an upper level trough will approach the area from the northwest, and could give a small boost to trade wind showers for the western half of the state. Areas of localized land and sea breezes will be possible with the lighter winds and associated cloud and shower buildups in the afternoons. This upper trough is then expected to move away by Friday.
By the weekend, models are hinting at some incoming tropical moisture along a trough connected to the ITCZ. Trades could push this area of moisture across Big Island and Maui if it moves far enough north. Trade winds also look to increase during the weekend.

Aviation

Gentle trades will focus clouds and showers mainly along windward and mauka regions with localized areas of nighttime land and daytime sea breezes tonight into Tuesday as an area of enhanced moisture moves across the state.
There are currently no AIRMETs in effect, but AIRMET Sierra for mountain obscurations could be possible over windward areas of Oahu and Maui County overnight with upstream clouds and showers.

Marine

No significant changes to the forecast with the afternoon package. Winds are expected to remain below Small Craft Advisory levels for the next several days.
High pressure north of the islands will maintain trade winds. However a front passing from west to east north of the island will help to weaken the trade wind flow, as will the remnants of former Tropical Cyclone Genevieve lifting to the north to the east of the islands. As the front moves to the east, and the tropical remnants lift north and dissipate, trade winds should restrengthen by the end of the week.
Background south swell will maintain surf below seasonal averages for the south shores through much of the the week. A small, long period south swell is expected to arrive by Saturday. A series of south swells are expected next week, which should produce surf heights at or above seasonal averages.
East facing shores will remain rough and choppy with steady decreasing trends as the trade winds ease through much of the week. Small, medium period easterly swell generated from former Tropical Cyclone Genevieve will linger over the next few days.
Surf along north facing and west shores will remain flat to tiny through the forecast period except for areas exposed to the easterly trade wrap.

HFO Watches/Warnings/Advisories

None.

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Data Courtesy of NOAA.gov