Hilo

Tonight: Partly cloudy. Haze. Lows 58 to 66 near the shore to 45 to 53 at 4000 feet. West winds up to 10 mph.

Friday: Haze in the morning. Mostly sunny in the morning, then mostly cloudy with scattered showers in the afternoon. Highs 75 to 81 near the shore to 61 to 69 at 4000 feet. West winds up to 10 mph shifting to the northeast in the afternoon. Chance of rain 50 percent.

Friday Night: Mostly cloudy with scattered showers. Lows 59 to 66 near the shore to 48 to 55 at 4000 feet. North winds up to 10 mph in the evening becoming light. Chance of rain 50 percent.

Kona

Tonight: Mostly clear. Lows around 69 near the shore to 39 to 47 near 5000 feet. Light winds.

Friday: Mostly sunny. Isolated showers in the afternoon. Highs 80 to 86 near the shore to around 66 near 5000 feet. Light winds becoming west up to 10 mph in the afternoon. Chance of rain 20 percent.

Friday Night: Partly cloudy. Isolated showers in the evening. Lows around 70 near the shore to 42 to 49 near 5000 feet. Light winds. Chance of rain 20 percent.

Waimea

Tonight: Mostly cloudy in the evening then becoming partly cloudy. Isolated showers. Lows 58 to 67 near the shore to 50 to 57 near 3000 feet. Light winds. Chance of rain 20 percent.

Friday: Mostly sunny with isolated showers in the morning, then partly sunny with scattered showers in the afternoon. Haze in the afternoon. Highs around 76 near the shore to 65 to 75 near 3000 feet. Northeast winds up to 10 mph. Chance of rain 50 percent.

Friday Night: 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 increasing to 10 to 15 mph after midnight. Chance of rain 50 percent.

Kohala

Tonight: Mostly cloudy in the evening then becoming partly cloudy. Isolated showers. Lows 58 to 67 near the shore to 50 to 57 near 3000 feet. Light winds. Chance of rain 20 percent.

Friday: Mostly sunny with isolated showers in the morning, then partly sunny with scattered showers in the afternoon. Haze in the afternoon. Highs around 76 near the shore to 65 to 75 near 3000 feet. Northeast winds up to 10 mph. Chance of rain 50 percent.

Friday Night: 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 increasing to 10 to 15 mph after midnight. Chance of rain 50 percent.

South Big Island

Tonight: Mostly clear. Lows around 70 near the shore to around 47 near 5000 feet. Light winds becoming northeast up to 10 mph after midnight.

Friday: Sunny. Highs around 82 near the shore to around 66 near 5000 feet. East winds up to 10 mph shifting to the southeast in the afternoon.

Friday Night: Partly cloudy. Haze. Lows around 71 near the shore to around 50 near 5000 feet. Northeast winds up to 15 mph.

Puna

Tonight: Partly cloudy. Haze. Lows 58 to 66 near the shore to 45 to 53 at 4000 feet. West winds up to 10 mph.

Friday: Haze in the morning. Mostly sunny in the morning, then mostly cloudy with scattered showers in the afternoon. Highs 75 to 81 near the shore to 61 to 69 at 4000 feet. West winds up to 10 mph shifting to the northeast in the afternoon. Chance of rain 50 percent.

Friday Night: Mostly cloudy with scattered showers. Lows 59 to 66 near the shore to 48 to 55 at 4000 feet. North winds up to 10 mph in the evening becoming light. Chance of rain 50 percent.

Waikoloa

Tonight: Partly cloudy. Lows 66 to 71 near the shore to 43 to 49 above 4000 feet. Light winds becoming southeast up to 10 mph after midnight.

Friday: Mostly sunny. Highs 80 to 86 near the shore to around 66 above 4000 feet. East winds up to 10 mph shifting to the north in the afternoon.

Friday Night: Mostly cloudy in the evening then becoming partly cloudy. Lows 67 to 72 near the shore to 46 to 52 above 4000 feet. East winds up to 15 mph.

Detailed Forecast

Synopsis

Cool and crisp mornings followed by typical daytime high temperatures expected the next couple of days. Moderate trades return this weekend allowing overnight temperatures to rebound toward normal and bringing a chance for rain mainly to windward and mauka areas.

Discussion

Cool and crisp conditions expected again tonight into Friday morning from Kauai to Maui County. Dewpoints in the low to mid 50s and light winds will allow temperatures to drop into the low 60s and even upper 50s in a few select locales. The front itself has dissipated in the waters of the Alenuihaha Channel between the Big Island and Maui and will support redevelopment of just a few scattered showers within the remnant moisture band tonight. Little if any additional forward progress is expected given the loss of upper-level forcing. A transient period of mid-level ridging over the NE Pacific Basin will allow moderate trades to return for the weekend. The return of easterlies will usher remnant frontal moisture presently in the vicinity of the Big Island westward and will serve as a moisture source for typical trade wind showers Saturday night into the first half of next week.
Strong consensus among the extended guidance that renewed troughing within NW flow aloft will favor low pressure development over the lower latitudes of the Central Pacific. The remnant frontal boundary will strengthen in response to developing forcing and will serve as the baroclinic pathway for the surface low to track near or north of the forecast area during the middle to latter portion of next week. Convective feedback is playing some havoc with model solutions at this time, so uncertainty is greater than normal, but the second half of next week seemingly offers the next opportunity for meaningful rainfall across some or all of the island chain.

Aviation

Moisture from a dissipated front will remain stalled near northern Big Island and east Maui and will produce isolated MVFR conditions along terrain through the evening. Gradual clearing is expected overnight as land breezes develop. Elsewhere, VFR conditions will prevail under a light, dry, and stable northwest flow.
An upper level trough passing over the state will continue to produce moderate turbulence aloft between FL180 and FL380 through the afternoon. Turbulence aloft will diminish from west to east overnight as the upper trough moves eastward. The jet stream may advance toward the state again on Friday and bring moderate turbulence above FL300.

Marine

Westerly winds will weaken tonight through early Friday. The ridge will lift northward late Friday into the weekend, which should allow light to moderate trade winds to return. The winds become more uncertain early next week as a trough moves in from the east and a cold front approaches from the northwest.
A combination of north northwest and north swells will produce large disorganized surf along north facing shores. The swells are expected to gradually decline Friday through the weekend. A High Surf Advisory remains in effect for north facing exposures through 6 pm HST Friday. A series of moderate northwest and north swells are possible early next week.
Aside from areas exposed to wrap from north swells, east shore surf will remain well below normal through the middle of next week. South shore surf will remain at background very small levels through the middle of next week.
A Small Craft Advisory (SCA) is now in effect for most marine zones through 6 pm Friday due to 10 foot seas.

Fire weather

Afternoon RH values will fall well into the 40s again tomorrow, but winds will fall short of the critical fire behavior threshold.

HFO Watches/Warnings/Advisories

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

Big Island Now Weather is brought to you by Blue Hawaiian Helicopters.

Check out their Big Island Helicopter Tours today!

Data Courtesy of NOAA.gov