Hilo

Tonight: Mostly cloudy with scattered showers. Lows 66 to 72 near the shore to 55 to 60 at 4000 feet. East winds up to 10 mph. Chance of rain 50 percent.

Wednesday: Mostly sunny. Isolated showers in the morning, then scattered showers in the afternoon. Highs around 82 near the shore to around 67 at 4000 feet. East winds up to 10 mph. Chance of rain 30 percent.

Wednesday Night: Mostly cloudy with scattered showers. Lows 66 to 72 near the shore to 55 to 60 at 4000 feet. North winds up to 10 mph. Chance of rain 50 percent.

Kona

Tonight: Partly cloudy. Isolated showers in the evening. Lows 68 to 76 near the shore to 52 to 57 near 5000 feet. Light winds. Chance of rain 20 percent.

Wednesday: Mostly sunny. Isolated showers in the afternoon. Highs around 87 near the shore to around 70 near 5000 feet. Light winds. Chance of rain 20 percent.

Wednesday Night: Partly cloudy. Lows 68 to 75 near the shore to around 55 near 5000 feet. Light winds.

Waimea

Tonight: Mostly cloudy with scattered showers in the evening, then partly cloudy with isolated showers after midnight. Lows 65 to 73 near the shore to 56 to 66 near 3000 feet. East winds up to 15 mph. Chance of rain 40 percent.

Wednesday: Mostly sunny. Highs around 83 near the shore to 70 to 80 near 3000 feet. East winds up to 15 mph increasing to 10 to 15 mph in the afternoon.

Wednesday Night: Partly cloudy with isolated showers in the evening, then mostly cloudy with scattered showers after midnight. Lows 65 to 73 near the shore to 58 to 67 near 3000 feet. East winds 10 to 15 mph. Chance of rain 50 percent.

Kohala

Tonight: Mostly cloudy with scattered showers in the evening, then partly cloudy with isolated showers after midnight. Lows 65 to 73 near the shore to 56 to 66 near 3000 feet. East winds up to 15 mph. Chance of rain 40 percent.

Wednesday: Mostly sunny. Highs around 83 near the shore to 70 to 80 near 3000 feet. East winds up to 15 mph increasing to 10 to 15 mph in the afternoon.

Wednesday Night: Partly cloudy with isolated showers in the evening, then mostly cloudy with scattered showers after midnight. Lows 65 to 73 near the shore to 58 to 67 near 3000 feet. East winds 10 to 15 mph. Chance of rain 50 percent.

South Big Island

Tonight: Partly cloudy. Breezy. Scattered showers in the evening. Lows around 75 near the shore to around 57 near 5000 feet. East winds up to 25 mph. Chance of rain 50 percent.

Wednesday: Mostly sunny. Breezy. Isolated showers in the afternoon. Highs around 85 near the shore to around 68 near 5000 feet. East winds up to 20 mph increasing to 10 to 20 mph in the afternoon. Chance of rain 20 percent.

Wednesday Night: Partly cloudy. Isolated showers after midnight. Lows around 75 near the shore to around 58 near 5000 feet. Northeast winds 10 to 15 mph. Chance of rain 20 percent.

Puna

Tonight: Mostly cloudy with scattered showers. Lows 66 to 72 near the shore to 55 to 60 at 4000 feet. East winds up to 10 mph. Chance of rain 50 percent.

Wednesday: Mostly sunny. Isolated showers in the morning, then scattered showers in the afternoon. Highs around 82 near the shore to around 67 at 4000 feet. East winds up to 10 mph. Chance of rain 30 percent.

Wednesday Night: Mostly cloudy with scattered showers. Lows 66 to 72 near the shore to 55 to 60 at 4000 feet. North winds up to 10 mph. Chance of rain 50 percent.

Waikoloa

Tonight: Partly cloudy. Isolated showers in the evening. Lows 70 to 76 near the shore to 52 to 58 above 4000 feet. Northeast winds up to 10 mph shifting to the east after midnight. Chance of rain 20 percent.

Wednesday: Sunny. Highs 85 to 90 near the shore to 68 to 73 above 4000 feet. Northeast winds up to 10 mph shifting to the northwest in the afternoon.

Wednesday Night: Mostly clear. Lows 70 to 76 near the shore to 52 to 58 above 4000 feet. Light winds becoming east up to 10 mph after midnight.

Detailed Forecast

Synopsis

Moderate trades will gradually build breezy levels tonight through Thursday as weak troughing around the state dissipates and a new surface high develops north of the state. Expect limited clouds and showers to focus along windward and mauka areas, particularly overnight and early morning hours. Slightly wetter tradewind showers will be possible late Friday into the weekend. A drier tradewind pattern may develop early next week.

Discussion

Limited clouds and showers can be seen mainly along windward and mauka areas, except for the Big Island where light to moderate showers are developing along the kona slopes. Starting tonight, upper level trough will have moved east of the state, while mid level ridging continues to limit clouds and showers to windward and mauka locations, especially overnight and early morning Wednesday. Rainfall totals are expected to be less than what was observed overnight Monday into Tuesday morning.
A surface high will develop and shift northwest of the state Wednesday allowing tradewinds to gradually strengthen to more typically breezy levels throughout the day and Thursday as the high settles north of the state. During the this time mid and upper level ridging will maintain dry and stable tradewind pattern while passing bands of low level clouds and showers embedded within the tradewind flow focuses light showers along windward and mauka areas.
An upper level trough will approach the state Friday just as an area of enhanced low level moisture moves from east to west across the state Friday afternoon into Saturday, increasing chances of showers for windward and mauka slopes. Cooling temperatures in the mid levels could make for some brief isolated heavy showers. Although there will be some lingering instability over the state for the rest of the weekend, there could be an over all drying trend as low level moisture becomes limited into early next week.

Aviation

Moderate trades will persist through Wednesday with mostly VFR conditions expected across the state. Brief MVFR ceilings will be possible with any passing shower, but overall mostly dry conditions are expected through Wednesday afternoon.
No AIRMET's are in effect.

Marine

Troughs to the west and east, coupled with the high to the far northeast with an accompanying ridge north of the islands will maintain gentle to moderate trade winds through tomorrow. As the troughs weaken, the pressure gradient will tighten, and trades will strengthen to moderate to locally fresh Thursday. Winds may strengthen to Small Craft Advisory (SCA) levels as early as Wednesday night in some of the typical windier waters near Maui and the Big Island. Winds are then expected to remain at SCA levels through the weekend.
The current long period northwest swell will linger into tomorrow, holding surf near seasonal average for north and west facing shores, before declining Wednesday night through Friday. By late Friday, a medium period north- northwest swell will build and once again help bring surf to near seasonal averages through the weekend.
The current long period south-southwest swell will keep surf along south facing shores elevated through tomorrow. Another long period south swell will help produce surf near seasonal average Thursday into early this weekend.
Surf along east facing shores will remain small through Thursday as small wind waves and tiny east swell persist. Choppy surf will increase slightly as trade winds strengthen across the region Friday into the weekend.

Fire weather

Moderate trade winds will gradually strengthen to typical breezy levels by Thursday. Dry air will keep RH levels near- critical values each afternoon for parts of the state for the next several days. RH values will increase towards the end of the week before another drying trends begins over the weekend into early next week. Inversion heights tonight will range from 5,000 to 6,000 ft.

HFO Watches/Warnings/Advisories

None.

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Data Courtesy of NOAA.gov