West Kaua’i

Today: Cloudy with scattered showers. Highs around 81 near the shore to around 70 above 3000 feet. Southeast winds up to 15 mph. Chance of rain 50 percent.

Tonight: Cloudy. Numerous showers in the evening, then showers after midnight. Lows around 69 near the shore to around 61 above 3000 feet. East winds up to 10 mph. Chance of rain 80 percent.

Tuesday: Cloudy. Showers early in the morning, then scattered showers in the late morning and afternoon. Highs around 82 near the shore to around 70 above 3000 feet. Southeast winds up to 10 mph in the morning becoming light. Chance of rain 80 percent.

South Kaua’i

Today: Cloudy with scattered showers. Highs 75 to 81. East winds up to 10 mph shifting to the southwest in the afternoon. Chance of rain 50 percent.

Tonight: Cloudy. Numerous showers in the evening, then showers after midnight. Lows around 69. West winds up to 10 mph in the evening becoming light. Chance of rain 90 percent.

Tuesday: Cloudy. Showers early in the morning, then scattered showers in the late morning and afternoon. Highs 77 to 83. Southwest winds up to 10 mph. Chance of rain 90 percent.

Kaua’i Mountains

Today: Cloudy. Scattered showers until late afternoon, then numerous showers late in the afternoon. Highs 73 to 79 in the valleys to around 63 above 4000 feet. South winds up to 10 mph. Chance of rain 60 percent.

Tonight: Cloudy. Numerous showers until early morning, then showers early in the morning. Lows 64 to 69 in the valleys to around 59 above 4000 feet. South winds up to 10 mph. Chance of rain 90 percent.

Tuesday: Cloudy. Showers early in the morning, then numerous showers in the late morning and afternoon. Highs 73 to 79 in the valleys to around 64 above 4000 feet. Light winds. Chance of rain 90 percent.

North Kaua’i

Today: Cloudy with scattered showers. Highs 73 to 81. South winds up to 10 mph. Chance of rain 50 percent.

Tonight: Cloudy. Scattered showers until early morning, then numerous showers early in the morning. Lows 64 to 71. South winds up to 10 mph. Chance of rain 70 percent.

Tuesday: Cloudy with scattered showers. Highs 73 to 82. Light winds. Chance of rain 50 percent.

East Kaua’i

Today: Cloudy with scattered showers. Highs 70 to 80. South winds up to 10 mph shifting to the southwest in the afternoon. Chance of rain 50 percent.

Tonight: Cloudy. Scattered showers in the evening, then numerous showers after midnight. Lows 65 to 73. Southwest winds 10 to 15 mph. Chance of rain 70 percent.

Tuesday: Cloudy with scattered showers. Highs 72 to 82. South winds up to 10 mph. Chance of rain 50 percent.

Detailed Forecast

Synopsis

Light to moderate rain continues across the western portion of the state, as the rain band gradually meanders away from the islands. Light and variable winds will favor some onshore sea breezes through midweek. By the latter half of the weak, light trades and quiet weather return to the forecast for the latter end of the week.

Discussion

Latest radar imagery continues to show remnant showers developing across the smaller Hawaiian Islands. These showers have been showing predominately less than a tenth of an inch per hour across the state, with some locally higher amounts across leeward Big Island. Despite this, opting to cancel the remaining Flood Watch for Kauai through Maui as a result. The threat for widespread flash flooding has decreased across the Hawaiian Islands, therefore, the Flood Watch has been cancelled. However, due to lingering moisture and saturated grounds, some minor flooding may still occur in areas affected by heavy showers.
Winds across the state are anticipated to be light and variable beginning tomorrow, favoring onshore sea breezes each afternoon, which may result in some showers as the lingering airmass over the islands remains moisture-rich. Moreover, dewpoints are expected to remain in the upper-60s throughout the week, maintaining high humidity levels that will persist until trades return. As the low pressure system, once anchored north of the islands, finally dislodged and moved northeastward away from the Hawaiian Islands by mid-week — and with it, the band of rainfall. A broad area of high pressure quickly builds in its wake, opening the door for light trades to make a return by the latter half of the week. Trades remain quite light and are not expected to make much of a profound effect on the local humidity levels. However, for the first time in several weeks, there is no potential event forthcoming for the Hawaiian Islands.

Aviation

Low cigs and SHRA will continue over the islands today. MVFR conds possible in heavier SHRA. Winds should remain light.
AIRMET Sierra is in effect for mtn obsc for Kauai to Maui.
AIRMET Tango is in effect for mod turb btn 120-FL280. Conds should slowly improve into tomorrow.

Marine

A weak surface trough remains draped over the central islands, extending from a low pressure system far north-northwest of the area. Moderate to fresh easterly winds will persist to the east of the trough, while light to moderate southerly winds occur to the west. This weak surface boundary along with an upper level disturbance moving over the region will continue to bring showers and the potential for isolated thunderstorms through mid-week. The surface trough lifts northwest in the latter half of the week and high pressure to the northeast will begin to take over at the surface, causing gentle to moderate easterly trades to gradually develop across the Hawaiian coastal waters by this weekend.
A small, medium-period northwest swell will diminish today. However, small surf will be maintained along north and west facing shores by a reinforcing pulse on Tuesday. Following this, northwest swell energy declines through the rest of the week.
A medium-period south swell will continue to decline today as well. A new south swell arrives on Tuesday, once again providing a boost to surf along south facing shores through mid week before gradually subsiding into the weekend.
Surf along east facing shores will remain below seasonal average with lighter than average trade winds near and upstream of the islands forecast through next week.

HFO Watches/Warnings/Advisories

None.

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Data Courtesy of NOAA.gov