Hilo

Tonight: Mostly clear. Isolated showers in the evening. Lows 64 to 71 near the shore to around 58 at 4000 feet. Light winds. Chance of rain 20 percent.

Tuesday: Sunny in the morning, then partly sunny with scattered showers in the afternoon. Highs 80 to 87 near the shore to 66 to 72 at 4000 feet. Southeast winds up to 10 mph. Chance of rain 40 percent.

Tuesday Night: Mostly cloudy in the evening then becoming mostly clear. Isolated showers. Lows 65 to 72 near the shore to around 58 at 4000 feet. Light winds. Chance of rain 20 percent.

Kona

Tonight: Mostly clear. Isolated showers in the evening. Lows 71 to 76 near the shore to 49 to 54 near 5000 feet. Light winds. Chance of rain 20 percent.

Tuesday: Sunny with isolated showers in the morning, then partly sunny with scattered showers in the afternoon. Highs around 86 near the shore to around 69 near 5000 feet. Light winds. Chance of rain 40 percent.

Tuesday Night: Partly cloudy in the evening then becoming clear. Lows around 74 near the shore to 50 to 55 near 5000 feet. Light winds.

Waimea

Tonight: Mostly clear. Lows 65 to 71 near the shore to 56 to 63 near 3000 feet. Light winds.

Tuesday: Sunny in the morning, then partly sunny with isolated showers in the afternoon. Highs around 80 near the shore to 69 to 79 near 3000 feet. Light winds. Chance of rain 20 percent.

Tuesday Night: Partly cloudy with isolated showers. Lows 65 to 72 near the shore to 58 to 64 near 3000 feet. Light winds. Chance of rain 20 percent.

Kohala

Tonight: Mostly clear. Lows 65 to 71 near the shore to 56 to 63 near 3000 feet. Light winds.

Tuesday: Sunny in the morning, then partly sunny with isolated showers in the afternoon. Highs around 80 near the shore to 69 to 79 near 3000 feet. Light winds. Chance of rain 20 percent.

Tuesday Night: Partly cloudy with isolated showers. Lows 65 to 72 near the shore to 58 to 64 near 3000 feet. Light winds. Chance of rain 20 percent.

South Big Island

Tonight: Mostly clear. Lows around 73 near the shore to around 54 near 5000 feet. Light winds.

Tuesday: Mostly sunny. Isolated showers in the afternoon. Highs around 86 near the shore to around 70 near 5000 feet. East winds up to 15 mph shifting to the southeast in the afternoon. Chance of rain 20 percent.

Tuesday Night: Mostly clear. Lows around 75 near the shore to around 54 near 5000 feet. Northeast winds around 10 mph.

Puna

Tonight: Mostly clear. Isolated showers in the evening. Lows 64 to 71 near the shore to around 58 at 4000 feet. Light winds. Chance of rain 20 percent.

Tuesday: Sunny in the morning, then partly sunny with scattered showers in the afternoon. Highs 80 to 87 near the shore to 66 to 72 at 4000 feet. Southeast winds up to 10 mph. Chance of rain 40 percent.

Tuesday Night: Mostly cloudy in the evening then becoming mostly clear. Isolated showers. Lows 65 to 72 near the shore to around 58 at 4000 feet. Light winds. Chance of rain 20 percent.

Waikoloa

Tonight: Mostly clear. Lows around 75 near the shore to around 54 above 4000 feet. Light winds.

Tuesday: Sunny in the morning then becoming partly sunny. Isolated showers. Highs 83 to 89 near the shore to 66 to 72 above 4000 feet. Northwest winds up to 10 mph. Chance of rain 20 percent.

Tuesday Night: Mostly clear. Lows around 75 near the shore to 53 to 58 above 4000 feet. Light winds.

Detailed Forecast

Synopsis

Daytime sea breezes and nighttime land breezes will bring clouds and showers over island interiors during the day and clearing at night. A weak front will stall and dissipate near Kauai Tuesday into Wednesday bringing a bit more showers to Kauai. Trade winds return Thursday through the weekend.

Discussion

A nearly stationary, stacked low pressure system is located about 850 miles northeast of Honolulu. An associated weak front passes within 100 miles north of Kauai moving southward slowly. This synoptic setup is creating a light wind regime over Hawaii. 00Z soundings show a strong 6 kft inversion and MIMIC total precipitable water over the islands ranges from around 1.2 inches across the eastern half of the state to 1.3 inches across the west. Current visible satellite and radar show partly sunny to mostly cloudy skies concentrated over the islands due to the sea breezes taking over from the trade winds. Tonight, land breezes will set and suppress cloud cover over the islands.
The diurnal land and sea breeze pattern with afternoon clouds and clearing at night will continue through Wednesday. The front will stall Kauai Tuesday into Wednesday and bring a bit more clouds and showers across the Garden Isle than the other islands. The front will not have any upper level support and in the process of dissipating as it reaches Kauai, so significant precipitation is not expected. Statewide, most of the showers will occur during the afternoons through Wednesday.
Trade winds will build in Thursday and push the frontal remnant to the west. Models show clouds and showers increasing Thursday into the weekend in conjunction with the return of the trades. The tropical upper tropospheric trough, or the typical summertime TUTT sets up west of the state, may provide a little bit of enhancement to the incoming showers. Showers will focus over windward and mauka areas.

Aviation

A light and variable wind pattern is expected to continue through Tuesday with sea breezes developing during the day and land breezes developing during the evening and overnight. Land breezes developing this evening should bring a decrease of clouds and showers tonight with mainly VFR conditions expected tonight. The one exception could be over Kauai, where lingering moisture could produce low clouds and showers overnight.
AIRMET Sierra is in effect for tempo mountain obscurations above 2500 feet on Kauai, which may persist through the night.

Marine

Light and variable winds will prevail through Tuesday as a trough approaches and stalls near Kauai. The trough will shift westward Wednesday and Wednesday night, allowing trades to return and gradually strengthen. High pressure building northeast of the state will bring fresh to strong trades back Thursday through next weekend.
A moderate, short to medium-period north swell will arrive tonight, peak late Tuesday through early Wednesday, then gradually decline through the end of the work week. North shore surf will return to mostly flat levels for next weekend. The lack of strong trades over and upstream of the state will keep east shore surf tiny through mid-week, aside from the locations exposed to the previously mentioned north swell. The return of fresh to strong trades will allow east shore surf to gradually build back to near normal levels Thursday through the weekend. South shore surf will remain small this week, with mainly background swells moving through. A small, long-period south-southwest swell could give south shore surf a boost over the weekend.

HFO Watches/Warnings/Advisories

None.

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Data Courtesy of NOAA.gov