Hilo

Tonight: Mostly cloudy with numerous showers. Lows 60 to 68 near the shore to 47 to 55 at 4000 feet. North winds up to 10 mph. Chance of rain 70 percent.

Wednesday: Mostly cloudy. Numerous showers in the morning, then scattered showers in the afternoon. Highs 77 to 82 near the shore to 63 to 68 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 70 percent.

Wednesday Night: Partly cloudy with isolated showers. Lows 61 to 68 near the shore to 47 to 54 at 4000 feet. North winds up to 15 mph. Chance of rain 20 percent.

Kona

Tonight: Mostly cloudy with scattered showers in the evening, then mostly clear with isolated showers after midnight. Haze through the night. Lows around 70 near the shore to 43 to 50 near 5000 feet. Light winds. Chance of rain 40 percent.

Wednesday: Mostly sunny in the morning, then partly sunny with scattered showers in the afternoon. Haze through the day. Highs around 83 near the shore to around 64 near 5000 feet. Southwest winds up to 10 mph shifting to the northwest in the afternoon. Chance of rain 40 percent.

Wednesday Night: Mostly cloudy. Haze. Lows around 71 near the shore to 43 to 50 near 5000 feet. Light winds.

Waimea

Tonight: Mostly cloudy with scattered showers. Lows 59 to 68 near the shore to 51 to 59 near 3000 feet. East winds up to 15 mph. Chance of rain 50 percent.

Wednesday: Partly sunny. Breezy. Numerous showers in the morning, then scattered showers in the afternoon. Highs around 77 near the shore to 68 to 76 near 3000 feet. East winds up to 20 mph shifting to the northeast 10 to 20 mph in the afternoon. Chance of rain 70 percent.

Wednesday Night: Partly cloudy with isolated showers. Lows 60 to 69 near the shore to 51 to 59 near 3000 feet. East winds 10 to 15 mph. Chance of rain 20 percent.

Kohala

Tonight: Mostly cloudy with scattered showers. Lows 59 to 68 near the shore to 51 to 59 near 3000 feet. East winds up to 15 mph. Chance of rain 50 percent.

Wednesday: Partly sunny. Breezy. Numerous showers in the morning, then scattered showers in the afternoon. Highs around 77 near the shore to 68 to 76 near 3000 feet. East winds up to 20 mph shifting to the northeast 10 to 20 mph in the afternoon. Chance of rain 70 percent.

Wednesday Night: Partly cloudy with isolated showers. Lows 60 to 69 near the shore to 51 to 59 near 3000 feet. East winds 10 to 15 mph. Chance of rain 20 percent.

South Big Island

Tonight: Partly cloudy. Breezy. Isolated showers in the evening. Haze through the night. Lows around 72 near the shore to around 49 near 5000 feet. East winds up to 20 mph. Chance of rain 20 percent.

Wednesday: Mostly sunny. Breezy. Haze through the day. Isolated showers in the afternoon. Highs around 84 near the shore to around 64 near 5000 feet. East winds up to 20 mph. Chance of rain 20 percent.

Wednesday Night: Mostly cloudy in the evening then becoming partly cloudy. Breezy and haze. Lows around 72 near the shore to around 48 near 5000 feet. East winds up to 20 mph.

Puna

Tonight: Mostly cloudy with numerous showers. Lows 60 to 68 near the shore to 47 to 55 at 4000 feet. North winds up to 10 mph. Chance of rain 70 percent.

Wednesday: Mostly cloudy. Numerous showers in the morning, then scattered showers in the afternoon. Highs 77 to 82 near the shore to 63 to 68 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 70 percent.

Wednesday Night: Partly cloudy with isolated showers. Lows 61 to 68 near the shore to 47 to 54 at 4000 feet. North winds up to 15 mph. Chance of rain 20 percent.

Waikoloa

Tonight: Partly cloudy. Breezy. Isolated showers in the evening. Lows 68 to 73 near the shore to 46 to 52 above 4000 feet. East winds up to 20 mph. Chance of rain 20 percent.

Wednesday: Breezy. Mostly sunny in the morning, then partly sunny with isolated showers in the afternoon. Highs 80 to 87 near the shore to 62 to 69 above 4000 feet. Northeast winds up to 20 mph. Chance of rain 20 percent.

Wednesday Night: Mostly cloudy in the evening then becoming partly cloudy. Lows 68 to 73 near the shore to 46 to 52 above 4000 feet. East winds up to 15 mph.

Detailed Forecast

Synopsis

Breezy trades continue through the weekend with clouds and showers focused over windward and mauka areas. A brief period of wet trades is anticipated late Wednesday through Thursday.

Discussion

Regional satellite indicates a band of shallow moisture associated with a remnant frontal zone anchored over the Big Island where showers have been widespread through today, including over leeward zones. The remainder of the forecast area remains on the drier side with little upstream moisture of note. Consensus exists among the medium range guidance that Wednesday night through the end of the week will feature aggressively building high pressure as a 1035mb high pressure tracks along roughly 35N. The convergent lead edge of the building high will provide a boost to existing shower activity as the plume of moisture presently anchored over the Big Island is ushered westward over the remainder of the island chain. As such, a period of wet trades is anticipated Wednesday night through Thursday. Moisture content within the trades then decreases to more typical levels as breezy trades continue through the weekend.

Aviation

Trades weaken slightly through tonight then strengthen again during Wednesday, especially over the western portion of the state. Trades will deliver clouds and showers to windward and mauka sections during this time, particularly those of Maui County and the Big Island. Isolated pockets of MVFR can be expected within any heavier showers with more persistent MVFR for Windward Big Island, especially through the first half of tonight. VFR prevails elsewhere.
AIRMET Sierra for mountain obscuration remains in effect for Windward Big Island.

Marine

The high pressure ridge north of the islands will maintain moderate trades tonight then strengthen to fresh to locally strong levels by Wednesday night, which will continue through early next week.
The current north swell will continue to decline through Wednesday with a small north reinforcement Thursday and Friday. Small surf heights expected for the weekend.
A moderate period south swell will keep surf heights slightly elevated, but below advisory levels along south facing shores through Thursday before tapering off through the rest of the week.
The current long period south swell will peak today near or slightly above the summer average heights. This swell will trend lower on Wednesday and surf will then return to small background levels from Friday into the weekend. Rough, choppy surf will continue along east facing shores as trade wind speeds remain elevated.

HFO Watches/Warnings/Advisories

None.

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Data Courtesy of NOAA.gov