Rest Of Today: Sunny in the morning, then partly sunny with isolated showers in the afternoon. Highs 76 to 81 near the shore to 64 to 69 at 4000 feet. Southeast winds up to 15 mph. Chance of rain 20 percent.
Tonight: Partly cloudy with scattered showers. Lows 59 to 66 near the shore to around 53 at 4000 feet. West winds up to 10 mph in the evening becoming light. Chance of rain 50 percent.
Thursday: Mostly sunny with isolated showers in the morning, then partly sunny with scattered showers in the afternoon. Highs 76 to 82 near the shore to 63 to 69 at 4000 feet. Light winds becoming east around 10 mph in the afternoon. Chance of rain 50 percent.
Kona
Rest Of Today: Sunny in the morning, then mostly cloudy with scattered showers in the afternoon. Highs 79 to 84 near the shore to around 66 near 5000 feet. Southwest winds up to 10 mph. Chance of rain 30 percent.
Tonight: Mostly clear. Lows around 67 near the shore to 42 to 50 near 5000 feet. Light winds.
ARTICLE CONTINUES BELOW AD
ARTICLE CONTINUES BELOW AD
Thursday: Mostly sunny. Highs 79 to 84 near the shore to around 66 near 5000 feet. North winds around 10 mph shifting to the northwest in the afternoon.
Waimea
Rest Of Today: Sunny in the morning, then partly sunny with isolated showers in the afternoon. Highs around 77 near the shore to 66 to 71 near 3000 feet. West winds up to 10 mph. Chance of rain 20 percent.
Tonight: Mostly cloudy with scattered showers in the evening, then partly cloudy with isolated showers after midnight. Lows 58 to 67 near the shore to 49 to 57 near 3000 feet. Southwest winds up to 15 mph. Chance of rain 50 percent.
Thursday: Partly sunny. Scattered showers in the morning, then numerous showers in the afternoon. Highs around 77 near the shore to 66 to 72 near 3000 feet. Southwest winds up to 10 mph shifting to the northwest in the afternoon. Chance of rain 70 percent.
Kohala
Rest Of Today: Sunny in the morning, then partly sunny with isolated showers in the afternoon. Highs around 77 near the shore to 66 to 71 near 3000 feet. West winds up to 10 mph. Chance of rain 20 percent.
ARTICLE CONTINUES BELOW AD
Tonight: Mostly cloudy with scattered showers in the evening, then partly cloudy with isolated showers after midnight. Lows 58 to 67 near the shore to 49 to 57 near 3000 feet. Southwest winds up to 15 mph. Chance of rain 50 percent.
Thursday: Partly sunny. Scattered showers in the morning, then numerous showers in the afternoon. Highs around 77 near the shore to 66 to 72 near 3000 feet. Southwest winds up to 10 mph shifting to the northwest in the afternoon. Chance of rain 70 percent.
South Big Island
Rest Of Today: Sunny in the morning, then mostly cloudy with scattered showers in the afternoon. Highs around 80 near the shore to around 66 near 5000 feet. Southeast winds up to 10 mph shifting to the southwest around 10 mph in the afternoon. Chance of rain 30 percent.
Tonight: Mostly clear. Lows around 69 near the shore to around 47 near 5000 feet. Northwest winds up to 10 mph.
Thursday: Mostly sunny. Highs around 79 near the shore to around 66 near 5000 feet. Northwest winds around 10 mph.
Puna
ARTICLE CONTINUES BELOW AD
Rest Of Today: Sunny in the morning, then partly sunny with isolated showers in the afternoon. Highs 76 to 81 near the shore to 64 to 69 at 4000 feet. Southeast winds up to 15 mph. Chance of rain 20 percent.
Tonight: Partly cloudy with scattered showers. Lows 59 to 66 near the shore to around 53 at 4000 feet. West winds up to 10 mph in the evening becoming light. Chance of rain 50 percent.
Thursday: Mostly sunny with isolated showers in the morning, then partly sunny with scattered showers in the afternoon. Highs 76 to 82 near the shore to 63 to 69 at 4000 feet. Light winds becoming east around 10 mph in the afternoon. Chance of rain 50 percent.
Waikoloa
Rest Of Today: Sunny. Isolated showers in the afternoon. Highs 78 to 83 near the shore to 63 to 69 above 4000 feet. West winds up to 10 mph. Chance of rain 20 percent.
Tonight: Partly cloudy. Lows 65 to 70 near the shore to 44 to 50 above 4000 feet. Southeast winds up to 10 mph.
Thursday: Mostly sunny. Isolated showers in the afternoon. Highs 78 to 83 near the shore to 63 to 69 above 4000 feet. South winds around 10 mph shifting to the northwest in the afternoon. Chance of rain 20 percent.
Detailed Forecast
Synopsis
Winds will strengthen out of the southwest today as a front approaches from the northwest, then passes over the island chain tonight through Friday morning. Expect increased clouds and showers as the front passes by. North winds will fill in behind the front, then become northeasterly trade winds through the weekend.
Discussion
Troughing to our northwest has pushed a weakened subtropical ridge across the islands this morning, keeping our winds light. Cloud cover across the islands decreased from last evening, but has begun to increase again early this morning across Kauai and Oahu as light southwesterlies develop ahead of an approaching front. Expect continued strengthening of these southwesterlies statewide today. Rainfall was minimal overnight, reflecting a rather dry and stable prefrontal airmass. Latest soundings showed less than in inch of PW with positive lifted index values.
Models show the front approaching from the northwest will reach Kauai tonight, then move down the island chain afterwards through Friday morning. Expect a limited period of wet weather for each island as frontal clouds and showers pass by. The front will have little upper level support, so we are not expecting heavy rain or thunderstorms along the boundary. High pressure will build in behind the front, producing cooler temperatures along with breezy north to northeast winds. Passing windward and mountain showers will continue through early next week as the high shifts eastward north of the main Hawaiian Islands this weekend.
Aviation
A cold front approaching the islands from the northwest will produce southwesterly winds spreading across the state today. A few showers will develop along south and west facing slopes of each island today and tonight. This cold front will reach Kauai later tonight and Oahu by early Thursday morning, producing periods of MVFR conditions as the front marches eastward down the island chain.
No AIRMETs are in effect and none are expected through this afternoon. AIRMETs for mountain obscuration will be needed as the front passes through each island.
Marine
An approaching cold front from the northwest will strengthen south to southwest winds to more moderate magnitudes, with locally stronger winds reaching Small Craft Advisory (SCA) thresholds around Kauai, later today. The front will move down the state from tonight through late Thursday as fresh northerly winds fill in behind the front. Winds will gradually veer to the northeast Friday and likely strengthen to SCA magnitudes as surface high pressure moves into the central North Pacific. This high will pass far north of the state on Sunday, maintaining fresh to locally strong trade winds.
Surf along north and west-facing shores will remain small through today with as background, short period northwest energy fades out. A significant, XL northwest (320 degree) swell will arrive late tonight and rapidly build down the island chain Thursday. This swell will lift surf to well above High Surf Warning levels along most north and west-facing shores. The passing of this swell within moderate to locally strong northeast winds will result in rough sea conditions and warrant an SCA for most local nearshore waters. A swell of this size will adversely impact coastal areas, especially during periods of high tide both Thursday and Friday evenings. Preparations should be made for the threat of coastal flooding as ocean water runs up and inundates beaches and potentially affects coastal properties and roadways. The northwest swell will slowly decline Friday and Saturday with a large, medium period north swell (350 degree) following on its heels Saturday and Sunday. This swell will maintain solid High Surf Advisory level surf along most northern exposures and keep seas at SCA heights. Surf along east-facing shores will experience a rapid increase this weekend due to a combination of rough, short period trade wind swell and large north swell. Seasonal small surf will occur along south shores.
HFO Watches/Warnings/Advisories
High Surf Warning from midnight tonight to 6 PM HST Friday for Niihau, Kauai Leeward, Waianae Coast, Oahu North Shore, Maui Windward West, Kauai North, Kauai East, Molokai Windward, Molokai North, Molokai West, Maui Central Valley North, Windward Haleakala, Big Island East, Big Island North.
Small Craft Advisory from midnight tonight to 6 AM HST Saturday for all Hawaiian waters except Maalaea Bay,
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