Photo Credit: James Grenz

Hilo

Today: Isolated showers. Mostly sunny, with a high near 84. Calm wind becoming east northeast 5 to 8 mph in the afternoon. Chance of precipitation is 20%.

Tonight: Isolated showers. Mostly cloudy, with a low around 64. Northeast wind around 6 mph becoming calm. Chance of precipitation is 20%.

Friday: Isolated showers. Mostly sunny, with a high near 83. East wind 5 to 9 mph. Chance of precipitation is 20%.

Kona

Today: Mostly sunny, with a high near 80. Calm wind becoming west northwest 5 to 8 mph in the morning.

Tonight: Partly cloudy, with a low around 63. West northwest wind 3 to 6 mph.

Friday: Isolated showers after noon. Partly sunny, with a high near 80. West wind around 6 mph becoming calm in the afternoon. Chance of precipitation is 20%.

Waimea

Today: Isolated showers. Mostly sunny, with a high near 79. Windy, with a northeast wind 18 to 23 mph decreasing to 11 to 16 mph in the afternoon. Winds could gust as high as 32 mph. Chance of precipitation is 20%.

Tonight: Scattered showers. Mostly cloudy, with a low around 56. East wind 11 to 13 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Friday: Scattered showers, mainly before noon. Mostly sunny, with a high near 79. East northeast wind around 14 mph, with gusts as high as 18 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Kohala

Today: Scattered showers. Partly sunny, with a high near 65. Windy, with an east northeast wind 17 to 24 mph, with gusts as high as 34 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Tonight: Scattered showers. Mostly cloudy, with a low around 51. Breezy, with an east wind around 18 mph, with gusts as high as 25 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Friday: Scattered showers. Partly sunny, with a high near 65. Breezy, with an east wind 18 to 20 mph, with gusts as high as 29 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

South Big Island

Today: Mostly sunny, with a high near 83. Breezy, with an east wind 20 to 22 mph, with gusts as high as 28 mph.

Tonight: Partly cloudy, with a low around 72. Breezy, with an east northeast wind 20 to 22 mph, with gusts as high as 29 mph.

Friday: Sunny, with a high near 83. Windy, with an east wind around 23 mph, with gusts as high as 29 mph.

Puna

Today: Scattered showers, mainly before noon. Partly sunny, with a high near 83. Northeast wind 9 to 11 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

Tonight: Scattered showers. Mostly cloudy, with a low around 62. North northeast wind 9 to 11 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

Friday: Scattered showers. Partly sunny, with a high near 82. Northeast wind 10 to 14 mph, with gusts as high as 20 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Waikoloa

Today: Sunny, with a high near 85. East wind 5 to 13 mph becoming north northwest in the afternoon.

Tonight: Mostly clear, with a low around 64. East northeast wind around 6 mph.

Friday: Sunny, with a high near 85. North wind around 6 mph.

Detailed Forecast

Synopsis

The remains of a front will bring an uptick in showers mainly to the windward sides of Kauai, Oahu and Molokai through Friday. High pressure building north of the state will maintain moderate trade which will become breezy this weekend, with typical trade wind weather expected over the weekend and early next week.

Discussion

Some minor changes to the forecast this morning, but the overall forecast philosophy remains the same.
A dissipating front is approaching Kauai this morning, with some of the associated clouds expected to reach Kauai over the next several hours. Expect an uptick in shower activity, particularly over the windward side, as those clouds move in. The overnight soundings from Lihue and Hilo both show an uptick in precipitable water (PW) since yesterday afternoon, with Lihue reporting 1.44 inches, at the high end of normal for June, and Hilo reporting 1.32 inches which is near normal. Satellite derived PW shows the leading edge of moisture over Kauai and Oahu at 3am.
The frontal remains are expected to reach Oahu this afternoon and could get down to Molokai later today. Expect an uptick in clouds and showers as that happens. Moderate trade winds are expected to continue today. Kauai could see an uptick in winds behind the feature, but as the front continues to dissipate as it advances, not expecting much of an uptick over the remaining islands.
Little change in the weather is expected over the remaining islands. Over the weekend, expect surface high pressure to strengthen and set up far north of the state. This will lead to increase in the trade winds, with some locally breezy winds filtering in across the area. A ridge aloft will remain in place, leading to typical trade wind weather with clouds and showers favoring windward areas.

Aviation

A high pressure ridge north of the Hawaiian Islands will keep moderate to breezy trade winds in the forecast through Friday. A convergent cloud band, remnants of an old frontal boundary, will drift into the western islands this morning. Expect increasing periods of MVFR conditions with scattered to numerous showers especially over windward airfields.
AIRMET Sierra in effect for Tempo Mountain Obscuration due to increasing clouds and showers for Oahu and Kauai. Wind speeds will also increase a bit today with AIRMET Tango likely for low level moderate turbulence South through West of island mountains.

Marine

High pressure north of the islands will maintain fresh to locally strong trade winds. A Small Craft Advisory for those waters around Maui County and the Big Island will continue over the next several days. The remnants of a front will bring increasing showers to Kauai and Oahu waters today and Friday.
A northwest swell will diminish through today. A second small northwest swell will bring a small bump to surf Saturday. South shore surf may pick up Friday and over the weekend as a couple of small, long period south swells move through the islands. East shore surf will increase as trades over and upstream of the state strengthen through the weekend.

HFO Watches/Warnings/Advisories

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

Data Courtesy of NOAA.gov