Hilo

Rest Of Tonight: Breezy. Mostly cloudy with scattered showers. Lows 62 to 70 near the shore to 51 to 59 at 4000 feet. Southwest winds up to 20 mph. Gusts up to 40 mph in the evening. Chance of rain 50 percent.

Saturday: Mostly cloudy with numerous showers. Highs 76 to 82 near the shore to 62 to 68 at 4000 feet. West winds up to 10 mph shifting to the northeast in the afternoon. Chance of rain 60 percent.

Saturday Night: Mostly cloudy with scattered showers. Lows 59 to 67 near the shore to 49 to 56 at 4000 feet. North winds up to 15 mph. Chance of rain 40 percent.

Kona

Rest Of Tonight: Mostly cloudy with scattered showers. Lows around 70 near the shore to 46 to 53 near 5000 feet. South winds up to 10 mph. Chance of rain 50 percent.

Saturday: Partly sunny with isolated showers. Highs 80 to 85 near the shore to around 67 near 5000 feet. Northwest winds up to 15 mph. Chance of rain 20 percent.

Saturday Night: Partly cloudy. Lows around 70 near the shore to 44 to 51 near 5000 feet. Northwest winds up to 15 mph in the evening becoming light.

Waimea

Rest Of Tonight: Breezy. Mostly cloudy with scattered showers. Lows 62 to 70 near the shore to 55 to 62 near 3000 feet. Southwest winds up to 20 mph. Chance of rain 50 percent.

Saturday: Mostly cloudy with numerous showers. Highs around 77 near the shore to 67 to 74 near 3000 feet. West winds up to 15 mph. Chance of rain 60 percent.

Saturday Night: Mostly cloudy with scattered showers. Lows 59 to 68 near the shore to 52 to 60 near 3000 feet. North winds up to 10 mph. Chance of rain 40 percent.

Kohala

Rest Of Tonight: Breezy. Mostly cloudy with scattered showers. Lows 62 to 70 near the shore to 55 to 62 near 3000 feet. Southwest winds up to 20 mph. Chance of rain 50 percent.

Saturday: Mostly cloudy with numerous showers. Highs around 77 near the shore to 67 to 74 near 3000 feet. West winds up to 15 mph. Chance of rain 60 percent.

Saturday Night: Mostly cloudy with scattered showers. Lows 59 to 68 near the shore to 52 to 60 near 3000 feet. North winds up to 10 mph. Chance of rain 40 percent.

South Big Island

Rest Of Tonight: Mostly cloudy with scattered showers. Lows around 72 near the shore to around 53 near 5000 feet. West winds up to 10 mph. Chance of rain 50 percent.

Saturday: Breezy. Partly sunny with scattered showers. Highs around 82 near the shore to around 68 near 5000 feet. West winds up to 10 mph increasing to up to 20 mph in the afternoon. Chance of rain 40 percent.

Saturday Night: Partly cloudy. Breezy. Lows around 71 near the shore to around 51 near 5000 feet. Northwest winds up to 20 mph shifting to the northeast up to 10 mph after midnight.

Puna

Rest Of Tonight: Breezy. Mostly cloudy with scattered showers. Lows 62 to 70 near the shore to 51 to 59 at 4000 feet. Southwest winds up to 20 mph. Gusts up to 40 mph in the evening. Chance of rain 50 percent.

Saturday: Mostly cloudy with numerous showers. Highs 76 to 82 near the shore to 62 to 68 at 4000 feet. West winds up to 10 mph shifting to the northeast in the afternoon. Chance of rain 60 percent.

Saturday Night: Mostly cloudy with scattered showers. Lows 59 to 67 near the shore to 49 to 56 at 4000 feet. North winds up to 15 mph. Chance of rain 40 percent.

Waikoloa

Rest Of Tonight: Mostly cloudy with scattered showers. Lows around 72 near the shore to 50 to 55 above 4000 feet. South winds up to 15 mph. Chance of rain 50 percent.

Saturday: Partly sunny with isolated showers. Highs 80 to 85 near the shore to around 67 above 4000 feet. Northwest winds up to 10 mph. Chance of rain 20 percent.

Saturday Night: Partly cloudy with isolated showers. Lows around 70 near the shore to 48 to 53 above 4000 feet. Northwest winds up to 10 mph shifting to the northeast after midnight. Chance of rain 20 percent.

Detailed Forecast

Synopsis

Fair trade wind weather builds in for the weekend and continues into next week.

Discussion

Much drier air characterized by dewpoints in the 50s will settle over Kauai and Oahu tonight and the remainder of the island over the weekend as moderate post-frontal NW flow gradually transitions to trades. Stable, breezy trades become established through the first half of next week as progressive high pressure migrates eastward across the Pacific Basin. Trades then weaken during the latter half of the week in response to renewed mid-level troughing.

Aviation

Showers along a convergence band have been decreasing across the Big Island, while stalled front near Kauai weakens. AIRMET Sierra is posted for tempo mountain obscurations above 3000 feet over the Big Island. Expect this AIRMET to continue into the evening hours before the clouds and showers dissipate, and will likely go away later tonight or early Saturday morning. All other AIRMETs have been cancelled. Dry air with light winds will usher in from the west through Saturday with no new AIRMETs are anticipated.

Marine

A cold front over the Kauai Channel, associated with a low (988 mb) pressure passing to the N, will continue to move E through tonight before stalling and dissipating near the Big Island Saturday. The threat of thunderstorms have decreased during the day today with mainly showers expected over the eastern half of the state tonight and likely lingering around the Big Island waters through Saturday. A Small Craft Advisory (SCA) remains in effect through tonight for many zones exposed to the NW swell due to seas of 10 feet or greater. Although seas should gradually decrease tonight, seas will likely remain at SCA thresholds for select waters on Saturday.
By Saturday morning, the front is expected to be near the Big Island with gentle to moderate NW winds expected over most of the state on Saturday. High pressure building far NW of the state should bring the return of moderate northerly trades on Sunday veering slightly more easterly and strengthening to locally strong speeds by Monday afternoon into Tuesday.
A new shorter-period NW to NNW (310 to 340 degree) swell quickly filled in during the day today, while the long- period N (010 degrees) swell gradually faded during the day. Surf should hold at advisory thresholds through tonight then likely drop below advisory thresholds on Saturday. Locally generated wind waves out of the S and W will gradually diminish through tomorrow. Another N swell will arrive Sunday and peak Monday, producing high surf along N facing shores. A couple moderate sized WNW swells are also expected, with a smaller one this weekend, and a slightly larger one from Monday into Wednesday with the peak on Tuesday.

HFO Watches/Warnings/Advisories

High Surf Advisory until 6 AM HST Saturday for Niihau, Oahu North Shore, Maui Windward West, Kauai North, Molokai Windward, Molokai North, Maui Central Valley North, Windward Haleakala.
Wind Advisory until 6 PM HST Saturday for Haleakala Summit.
High Wind Warning until 6 AM HST Saturday for Big Island Summits.
Small Craft Advisory until 6 AM HST Saturday for Kauai Northwest Waters, Kauai Windward Waters, Kauai Leeward Waters, Kauai Channel, Oahu Windward Waters, Oahu Leeward Waters, Kaiwi Channel, Maui County Windward Waters, Big Island Windward Waters.

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Data Courtesy of NOAA.gov