Hilo

Rest Of Tonight: Mostly cloudy with scattered showers. Lows 61 to 69 near the shore to 48 to 55 at 4000 feet. Northwest winds up to 10 mph. Chance of rain 50 percent.

Friday: Partly sunny with scattered showers in the morning, then mostly sunny with isolated showers in the afternoon. Highs 78 to 83 near the shore to around 67 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 50 percent.

Friday Night: Partly cloudy with isolated showers in the evening, then mostly cloudy with scattered showers after midnight. Lows 61 to 69 near the shore to 47 to 54 at 4000 feet. Northwest winds up to 10 mph. Chance of rain 50 percent.

Kona

Rest Of Tonight: Mostly cloudy in the evening then becoming partly cloudy. Haze. Lows around 71 near the shore to 45 to 51 near 5000 feet. Light winds.

Friday: Partly sunny. Haze through the day. Scattered showers in the afternoon. Highs 83 to 88 near the shore to around 66 near 5000 feet. West winds up to 10 mph. Chance of rain 40 percent.

Friday Night: Partly cloudy. Haze. Lows around 71 near the shore to 44 to 51 near 5000 feet. Light winds.

Waimea

Rest Of Tonight: Breezy. Partly cloudy with isolated showers. Lows 60 to 70 near the shore to 51 to 60 near 3000 feet. East winds 10 to 25 mph. Chance of rain 20 percent.

Friday: Breezy. Sunny with isolated showers. Highs around 79 near the shore to 70 to 78 near 3000 feet. East winds 10 to 25 mph. Chance of rain 20 percent.

Friday Night: Mostly clear. Breezy. Isolated showers in the evening. Lows 61 to 70 near the shore to 51 to 59 near 3000 feet. East winds up to 25 mph. Chance of rain 20 percent.

Kohala

Rest Of Tonight: Breezy. Partly cloudy with isolated showers. Lows 60 to 70 near the shore to 51 to 60 near 3000 feet. East winds 10 to 25 mph. Chance of rain 20 percent.

Friday: Breezy. Sunny with isolated showers. Highs around 79 near the shore to 70 to 78 near 3000 feet. East winds 10 to 25 mph. Chance of rain 20 percent.

Friday Night: Mostly clear. Breezy. Isolated showers in the evening. Lows 61 to 70 near the shore to 51 to 59 near 3000 feet. East winds up to 25 mph. Chance of rain 20 percent.

South Big Island

Rest Of Tonight: Mostly clear. Breezy and haze. Lows around 72 near the shore to around 49 near 5000 feet. Northeast winds up to 25 mph becoming 10 to 20 mph after midnight.

Friday: Mostly sunny. Breezy and haze. Highs around 86 near the shore to around 66 near 5000 feet. East winds up to 25 mph.

Friday Night: Mostly clear. Breezy and haze. Lows around 72 near the shore to around 49 near 5000 feet. Northeast winds 10 to 20 mph.

Puna

Rest Of Tonight: Mostly cloudy with scattered showers. Lows 61 to 69 near the shore to 48 to 55 at 4000 feet. Northwest winds up to 10 mph. Chance of rain 50 percent.

Friday: Partly sunny with scattered showers in the morning, then mostly sunny with isolated showers in the afternoon. Highs 78 to 83 near the shore to around 67 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 50 percent.

Friday Night: Partly cloudy with isolated showers in the evening, then mostly cloudy with scattered showers after midnight. Lows 61 to 69 near the shore to 47 to 54 at 4000 feet. Northwest winds up to 10 mph. Chance of rain 50 percent.

Waikoloa

Rest Of Tonight: Mostly clear. Breezy. Lows 69 to 74 near the shore to 47 to 54 above 4000 feet. East winds up to 25 mph.

Friday: Mostly sunny. Breezy. Isolated showers in the afternoon. Highs 82 to 89 near the shore to 64 to 72 above 4000 feet. Northeast winds up to 25 mph. Chance of rain 20 percent.

Friday Night: Mostly clear. Breezy. Lows 69 to 74 near the shore to 46 to 52 above 4000 feet. Southeast winds up to 20 mph.

Detailed Forecast

Synopsis

Breezy trade winds will persist through the remainder of this week into next week, gradually increasing in strength toward the latter half of next week. Brief showers will favor windward and mountain areas, with leeward areas remaining mostly dry, apart from a few isolated showers at night.

Discussion

Trade winds prevail across the islands, increasing in strength over the upcoming weekend and into next week. A 1030 mb broad area of high pressure will persist northwest of the islands, moving eastward through the next several days, with an elongated frontal passage in its wake. This may result in a subtle veering wind direction to a more east-southeast direction late Saturday. Winds will revert back to a primarily eastern direction by Monday, strengthening by mid-week.
By next week, a new, strong high will propagate eastward north of the islands. The aforementioned frontal passage is expected to weaken as it gets overrun by the established trades. Clouds and showers will favor windward and mountain areas, especially during the overnight and early morning hours. Conversely, limited rainfall will be expected on leeward areas apart from a few isolated showers during the night, foreshadowing the beginning of the dry season. Aside from all this, leeward areas of the Big Island will continue to expect clouds and showers each afternoon, diminishing by the overnight hours.

Aviation

Moderate trades through the forecast period. Low cigs and SHRA expected over windward and mauka locations. MVFR conds possible in SHRA but otherwise VFR prevails.
No other AIRMETs are in effect.

Marine

High pressure north of the islands continues to bring moderate to locally strong trade winds to the region, and those winds are expected to continue through the weekend as the high moves to the northeast of the islands. A Small Craft Advisory (SCA) is in effect for the typical windier waters near Maui County and the Big Island, and that is expected to remain in place into next week.
The current moderate to long period north-northwest swell will peak tonight and then slowly decline this weekend. A series of northwest to north swells are expected next week that should produce near or above seasonal average surf.
A small, long period south swell that peaked today will linger into Saturday. This swell will result in above summer average surf heights before slowly subsiding early next week. A mix of both a reinforcing south southwest swell and new long period south southeast swell energy this weekend should maintain near to above seasonal average surf. South-facing shore surf will generally decline next week, but smaller south southwest swells will hold surf at near summer averages through the middle of next week.
As the trades pick up a bit on Friday, expect a bit of an uptick in the easterly wind wave chop, which will continue through the weekend.

HFO Watches/Warnings/Advisories

Small Craft Advisory until 6 AM HST Saturday for Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters.

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Data Courtesy of NOAA.gov