Hilo
Tonight: Mostly cloudy. Numerous showers in the evening, then occasional showers after midnight. Lows around 69 near the coast to around 55 at 4,000 feet. Northeast winds up to 10 mph, turning northwest after midnight. 80 percent chance of rain.
Sunday: Partly sunny. Numerous morning showers, then scattered afternoon showers. Highs around 85 near the coast to 69 to 74 at 4,000 feet. Northeast winds up to 10 mph. 70 percent chance of rain.
Sunday night: Mostly cloudy with occasional showers. Lows around 70 near the coast to around 56 at 4,000 feet. Northeast winds up to 10 mph. 70 percent chance of rain.
Kona
Tonight: Mostly cloudy with a few showers in the evening, becoming partly cloudy with a few showers after midnight. Lows 70 to 75 near the coast to around 56 at 5,000 feet. Light wind. 50 percent chance of rain.
Sunday: Sunny in the morning, mostly cloudy in the afternoon with isolated showers. Maximum temperatures 27 to 28 degrees near the coast, up to around 20 degrees at 1,500 meters. Light wind. Chance of rain 40 percent.
Sunday night: Mostly cloudy in the evening, then partly cloudy. Scattered showers. Lows 71 to 76 near the coast to around 57 at 5,000 feet. Light wind. 20 percent chance of rain.
Waimea
Tonight: Mostly cloudy in the evening, then partly cloudy. A few showers. Lows around 69 near the coast to 57 to 63 at 3,000 feet. East winds 10 to 15 mph, decreasing to 15 mph after midnight. A 50% chance of rain.
Sunday: Mostly sunny with a few showers. Highs around 83 near the coast to 69 to 80 at 3,000 feet. East winds up to 15 mph increasing to 10 to 15 mph in the afternoon. 50% chance of rain.
Sunday night: Mostly cloudy in the evening, then partly cloudy. Scattered showers. Lows around 70 near the coast to 58 to 64 at 3,000 feet. East winds 10 to 15 mph. 50 percent chance of rain.
Kohala
Tonight: Mostly cloudy in the evening, then partly cloudy. A few showers. Lows around 69 near the coast to 57 to 63 at 3,000 feet. East winds 10 to 15 mph, decreasing to 15 mph after midnight. A 50% chance of rain.
Sunday: Mostly sunny with a few showers. Highs around 83 near the coast to 69 to 80 at 3,000 feet. East winds up to 15 mph increasing to 10 to 15 mph in the afternoon. 50% chance of rain.
Sunday night: Mostly cloudy in the evening, then partly cloudy. Scattered showers. Lows around 70 near the coast to 58 to 64 at 3,000 feet. East winds 10 to 15 mph. 50 percent chance of rain.
Southern Big Island
Tonight: Mostly cloudy with a few showers in the evening, becoming partly cloudy after midnight. Lows around 71 near the coast to 54 at 5,000 feet. East winds up to 15 mph becoming northeast after midnight. A 20 percent chance of rain.
Sunday: Sunny in the morning, then mostly cloudy with a few afternoon showers. Highs around 86 near the coast to around 73 at 5,000 feet. East winds up to 15 mph, increasing to 10 to 15 mph in the afternoon. 20 percent chance of rain.
Sunday night: Mostly cloudy with a few showers in the evening, becoming mostly clear after midnight. Lows around 72 near the coast to around 55 at 5,000 feet. Northeast winds 10 to 15 mph. 20 percent chance of rain.
Pune
Tonight: Mostly cloudy. Numerous showers in the evening, then occasional showers after midnight. Lows around 69 near the coast to around 55 at 4,000 feet. Northeast winds up to 10 mph, turning northwest after midnight. 80 percent chance of rain.
Sunday: Partly sunny. Numerous morning showers, then scattered afternoon showers. Highs around 85 near the coast to 69 to 74 at 4,000 feet. Northeast winds up to 10 mph. 70 percent chance of rain.
Sunday night: Mostly cloudy with occasional showers. Lows around 70 near the coast to around 56 at 4,000 feet. Northeast winds up to 10 mph. 70 percent chance of rain.
Waikoloa
Tonight: Mostly cloudy in the evening, then partly cloudy. Scattered showers. Lows around 73 near the coast to 52 to 59 above 4,000 feet. Northeast winds up to 10 mph, turning southeast after midnight. 20 percent chance of rain.
Sunday: Sunny in the morning, then partly sunny in the afternoon with isolated showers. Maximum temperatures around 30 degrees near the coast, up to 21 to 24 degrees above 1,200 meters. Northeast winds up to 24 km/h. Chance of rain 20 percent.
Sunday night: Mostly cloudy with a few showers in the evening, becoming partly cloudy after midnight. Lows around 74 near the coast to 53 to 60 above 4,000 feet. Northeast winds as low as 10 mph. A 20 percent chance of rain.
Summary
Moderate to locally light trade winds will prevail over the next 7 days as a high pressure system meanders north of the island chain. Typical summer trade wind weather will prevail, with bands of enhanced moisture moving across the state at times. Showers will favor windward slopes and coasts, particularly at night and during the early morning hours, with some showers reaching windward areas at times.
discussion
Currently at the surface is a 1032 mb high centered about 1600 miles north-northeast of Honolulu, driving moderate to locally breezy trade winds across the island chain this evening. Infrared satellite imagery shows partly cloudy conditions across much of the state, with a little more cloud cover over Oahu and the leeward Big Island. Radar imagery shows scattered showers moving into leeward slopes and coasts, with some of these showers reaching leeward areas at times. The primary focus of the forecast remains on trade wind trends and rain chances over the next few days.
Over the next 7 days, a high pressure system will move north of the state, bringing moderate to locally light trade winds across the island chain, with only minor variations in strength from day to day. As for the rest of the weather details, fairly typical trade wind weather is expected to prevail, with bands of increased moisture periodically moving across the islands. Showers will favor the windward and mauka areas, particularly at night and during the early morning hours, with some showers reaching leeward communities at times.
aviation
Moderate trade winds will strengthen through tomorrow, bringing low clouds and occasional short showers to windward and mountainous regions, producing isolated MVFR CIG. Most showers will be seen overnight and in the early morning hours.
No AIRMETs are in effect. Increased trade wind speeds could bring the potential for weak turbulence downwind of terrain tomorrow.
marine
A high pressure system in the north-northeast of the state is producing moderate to locally strong trade winds. A small boat warning is in effect through early Tuesday for the normally windier waters of Maui County and the Big Island. Moderate to locally strong trade winds are expected to continue for most of next week as the high moves north across the state. Winds may ease somewhat mid-week as a weak low pressure system moves across the state from the east.
The current small southerly swell (13-14 seconds) will hold through tonight and then gradually decrease Sunday and Monday. Several small southerly swells could move through the state next week, creating small waves on south-facing coasts. A small pulse from the north-northwest will keep small waves on north-facing coasts for the rest of the weekend. As the trade winds increase both upriver and locally, expect east-facing surf to gradually build Sunday through the first half of next week. There could also be a small strengthening of surf on east-facing coasts from former Tropical Cyclone Emilia early next week.
HFO Observations/Warnings/Advice
Small Craft Advisory in effect until 6:00 a.m. HST Tuesday for Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Big Island Leeward Waters and Big Island Southeast Waters.
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Data courtesy of NOAA.gov
