Photo Credit: Braden Jarvis

West Kaua’i

Today: Mostly sunny. Breezy. Scattered showers in the morning, then isolated showers in the afternoon. Highs around 82 near the shore to around 71 above 3000 feet. Northeast winds up to 20 mph. Chance of rain 50 percent.

Tonight: Partly cloudy. Breezy. Isolated showers in the evening, then scattered showers after midnight. Lows around 69 near the shore to around 58 above 3000 feet. Northeast winds up to 20 mph. Chance of rain 50 percent.

Tuesday: Breezy. Mostly sunny with isolated showers. Highs around 82 near the shore to around 71 above 3000 feet. East winds up to 20 mph. Chance of rain 20 percent.

South Kaua’i

Today: Breezy. Partly sunny with scattered showers. Highs around 79. Northeast winds 15 to 25 mph. Chance of rain 50 percent.

Tonight: Breezy. Mostly cloudy with scattered showers. Lows 64 to 71. Northeast winds 15 to 25 mph. Chance of rain 50 percent.

Tuesday: Partly sunny. Breezy. Numerous showers in the morning, then scattered showers in the afternoon. Highs around 79. Northeast winds 15 to 25 mph. Chance of rain 70 percent.

Kaua’i Mountains

Today: Breezy. Mostly cloudy with scattered showers. Highs 70 to 76 in the valleys to around 62 above 4000 feet. East winds up to 20 mph. Chance of rain 50 percent.

Tonight: Mostly cloudy. Breezy. Numerous showers in the evening, then frequent showers after midnight. Lows 57 to 66 in the valleys to around 54 above 4000 feet. East winds up to 20 mph. Chance of rain 80 percent.

Tuesday: Mostly cloudy. Breezy. Frequent showers in the morning, then scattered showers in the afternoon. Highs 70 to 76 in the valleys to around 62 above 4000 feet. East winds up to 20 mph increasing to 10 to 20 mph in the afternoon. Chance of rain 80 percent.

North Kaua’i

Today: Partly sunny with scattered showers. Highs 72 to 82. East winds up to 15 mph increasing to 10 to 15 mph in the afternoon. Chance of rain 50 percent.

Tonight: Mostly cloudy. Scattered showers in the evening, then numerous showers after midnight. Lows 61 to 70. East winds up to 15 mph. Chance of rain 70 percent.

Tuesday: Breezy. Partly sunny with scattered showers. Highs 72 to 82. East winds up to 20 mph. Chance of rain 50 percent.

East Kaua’i

Today: Breezy. Mostly cloudy with scattered showers. Highs 71 to 81. Northeast winds 10 to 20 mph. Chance of rain 50 percent.

Tonight: Mostly cloudy. Scattered showers in the evening, then numerous showers after midnight. Lows 57 to 72. Northeast winds 10 to 15 mph. Chance of rain 70 percent.

Tuesday: Mostly cloudy. Breezy. Numerous showers in the morning, then scattered showers in the afternoon. Highs 71 to 81. Northeast winds 10 to 20 mph. Chance of rain 70 percent.

Detailed Forecast

Synopsis

Moderate to breezy northeast to east trade winds will prevail through the week, with clouds and showers favoring windward and mauka locations overnight through the morning periods as areas of moisture move through. The trade winds may ease slightly next weekend as the ridge weakens to the north.

Discussion

Guidance remains in good agreement through the week and depicts mostly benign conditions persisting with the subtropical ridge remaining in place to the north. Moderate to breezy northeast trades will continue today, then shift out of the east tonight through Tuesday as a residual band of moisture settles southward into the area. This band of moisture will stall in the area and slowly diminish through midweek. This will support increasing windward shower coverage, with some showers making it over to our leeward sections of the smaller islands.
The breezy trades may ease slightly next weekend into early next week as the ridge weakens to the north in response to deep low pressure developing far northwest of the state near Midway.

Aviation

Moderate to breezy trade winds will prevail during the next few days as a surface high builds north of the islands. SHRA and some MVFR conds are possible for windward and mauka locations. VFR conds will prevail over leeward areas.
AIRMET Sierra is in effect for mtn obsc for windward Big Island. This may need canceled as conds improve this morning.
AIRMET Tango in effect for mod turb for all islands.

Marine

High pressure north of the state will slowly drift east and strengthen over the next several days, resulting in strengthening trade winds over the Hawaii region. A Small Craft Advisory remains in effect through Tuesday for the typical windier waters around Maui and the Big Island.
Surf heights along all shores will remain below advisory thresholds through the end of this week. A moderate, medium period north swell will decrease today before another medium period northwest swell builds into the region from late Wednesday into Thursday. Surf along east facing shores will rise and become choppy as trade winds strengthen. South facing shores will continue to see small background swell pulses through the week.

HFO Watches/Warnings/Advisories

Small Craft Advisory until 6 PM HST Tuesday for Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters.

Data Courtesy of NOAA.gov