Hilo

Tonight: Mostly cloudy. Numerous showers in the evening, then scattered showers after midnight. Lows 58 to 67 near the shore to 48 to 56 at 4000 feet. North winds up to 10 mph. Chance of rain 70 percent.

Sunday: Partly sunny in the morning then becoming mostly sunny. Scattered showers. Highs 72 to 81 near the shore to 59 to 66 at 4000 feet. North winds up to 10 mph. Chance of rain 30 percent.

Sunday Night: Mostly cloudy in the evening then becoming partly cloudy. Scattered showers. Lows 57 to 66 near the shore to 46 to 54 at 4000 feet. North winds up to 10 mph. Chance of rain 30 percent.

Kona

Tonight: Partly cloudy with isolated showers in the evening, then clear after midnight. Lows around 69 near the shore to 44 to 50 near 5000 feet. North winds up to 15 mph shifting to the northeast after midnight. Chance of rain 20 percent.

Sunday: Sunny. Highs 80 to 85 near the shore to around 66 near 5000 feet. Light winds.

Sunday Night: Mostly clear. Lows around 69 near the shore to 42 to 48 near 5000 feet. Light winds.

Waimea

Tonight: Mostly cloudy with scattered showers. Lows 58 to 66 near the shore to 51 to 58 near 3000 feet. North winds up to 10 mph. Chance of rain 50 percent.

Sunday: Mostly sunny. Scattered showers in the morning, then isolated showers in the afternoon. Highs 60 to 78. Northeast winds up to 10 mph. Chance of rain 30 percent.

Sunday Night: Partly cloudy with isolated showers. Lows 57 to 67 near the shore to 49 to 57 near 3000 feet. Northeast winds up to 10 mph. Chance of rain 20 percent.

Kohala

Tonight: Mostly cloudy with scattered showers. Lows 58 to 66 near the shore to 51 to 58 near 3000 feet. North winds up to 10 mph. Chance of rain 50 percent.

Sunday: Mostly sunny. Scattered showers in the morning, then isolated showers in the afternoon. Highs 60 to 78. Northeast winds up to 10 mph. Chance of rain 30 percent.

Sunday Night: Partly cloudy with isolated showers. Lows 57 to 67 near the shore to 49 to 57 near 3000 feet. Northeast winds up to 10 mph. Chance of rain 20 percent.

South Big Island

Tonight: Mostly clear. Isolated showers in the evening. Lows around 72 near the shore to around 51 near 5000 feet. Northwest winds up to 15 mph in the evening becoming light. Chance of rain 20 percent.

Sunday: Sunny. Highs around 81 near the shore to around 66 near 5000 feet. Light winds becoming southeast up to 10 mph in the afternoon.

Sunday Night: Mostly clear. Lows around 70 near the shore to around 49 near 5000 feet. Light winds.

Puna

Tonight: Mostly cloudy. Numerous showers in the evening, then scattered showers after midnight. Lows 58 to 67 near the shore to 48 to 56 at 4000 feet. North winds up to 10 mph. Chance of rain 70 percent.

Sunday: Partly sunny in the morning then becoming mostly sunny. Scattered showers. Highs 72 to 81 near the shore to 59 to 66 at 4000 feet. North winds up to 10 mph. Chance of rain 30 percent.

Sunday Night: Mostly cloudy in the evening then becoming partly cloudy. Scattered showers. Lows 57 to 66 near the shore to 46 to 54 at 4000 feet. North winds up to 10 mph. Chance of rain 30 percent.

Waikoloa

Tonight: Mostly clear. Isolated showers in the evening. Lows 65 to 71 near the shore to 47 to 53 above 4000 feet. North winds up to 10 mph shifting to the east after midnight. Chance of rain 20 percent.

Sunday: Sunny. Highs 78 to 85 near the shore to 64 to 69 above 4000 feet. East winds up to 15 mph shifting to the north in the afternoon.

Sunday Night: Mostly clear. Lows 66 to 71 near the shore to 45 to 51 above 4000 feet. Northeast winds up to 10 mph.

Detailed Forecast

Synopsis

A front has moved through the Big Island. A drier and stable weather pattern will continue to fill in behind the front through Sunday as northwesterly winds gradually veer northeasterly. Overall, a dry trade wind pattern will persist through next week with the exception of a couple of weak fronts moving through the state causing little to no significant changes. Precipitation will be limited to windward and mauka area.

Discussion

Latest satellite and surface analysis a weak front has passed through the Big Island with the main cloud band just south of the state. Dewpoints have fallen below 70s and range from 50s to upper 60s as gentle to locally breezy northwesterly winds, driven by a weak high west of of the state, advects a drier airmass over the state. The weak surface high west of the state will gradually shift eastward, veering winds to northeast tonight into Sunday. Clouds and showers will be limited to exposed northerly slopes and windward and mauka areas as a dry and stable airmass settles over the state. The exception may be windward Big Island which will see a more typical tradewind pattern as the remnant moisture band front the front lingers just east of the island.
A weak and shallow frontal boundary and assoicated weak upper level trough will move over the state Monday into Tuesday. Expect just a slight increase in windward clouds and showers as winds back slightly to a more NNE direction. In the extended forecast, model guidance continues to shows a shortwave trough deepening the upper level trough and another surface front moving through the state during the second half of the week. The ECMWF is a little more progressive at bringing the front through the state than the GFS. Thus the exact timing is still uncertain at this time. However, due to the limited moisture, no significant weather expected at this time.

Aviation

The dissipating front just east of the Big Island continues to produce scattered showers over windward Big Island this afternoon. As this front continues to move away from the state, showers will decrease this evening with VFR conditions expected across the state by later tonight. Fair weather with gentle to moderate northeast trades are expected on Sunday.
AIRMET Sierra for tempo mountain obscuration is in effect for parts of windward Big Island this afternoon. Conditions should improve this evening.

Marine

High pressure will build in northwest of the islands on Monday and slowly track eastward. Moderate northwesterly winds will strengthen and veer northeasterly by Sunday continuing through most of next week.
Moderate to large north northeast and small northwest swells will continue to produce moderate to large surf mainly to north facing shores. The north northeast swell will build Sunday into Monday, with surf heights likely reaching advisory levels Sunday night and Monday, before dropping back slightly for the rest of the week. Some boost in surf is also expected along east and west facing shores. Surf along south shores will remain small this coming week.

HFO Watches/Warnings/Advisories

Wind Advisory until 6 AM HST Sunday for Big Island Summits.

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Data Courtesy of NOAA.gov