Hilo

Today: Scattered showers. Partly sunny, with a high near 82. East northeast wind 3 to 8 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Tonight: Showers likely, mainly after 7pm. Mostly cloudy, with a low around 65. Light and variable wind becoming west southwest around 5 mph in the evening. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

Friday: Showers likely, mainly before 7am. Partly sunny, with a high near 82. Light and variable wind becoming east southeast around 5 mph in the morning. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

Kona

Today: Scattered showers after noon. Mostly sunny, with a high near 82. Light west wind becoming northwest 5 to 9 mph in the afternoon. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

Tonight: Scattered showers before 7pm. Partly cloudy, with a low around 62. Northeast wind 3 to 6 mph. Chance of precipitation is 40%.

Friday: Isolated showers after 7am. Partly sunny, with a high near 83. Southeast wind 5 to 7 mph becoming west in the morning. Chance of precipitation is 20%.

Waimea

Today: Isolated showers after noon. Mostly sunny, with a high near 74. Northeast wind 7 to 10 mph. Chance of precipitation is 20%.

Tonight: Scattered showers, mainly after 7pm. Mostly cloudy, with a low around 50. Northeast wind around 10 mph. Chance of precipitation is 40%. New precipitation amounts between a tenth and quarter of an inch possible.

Friday: Scattered showers. Partly sunny, with a high near 76. Breezy, with a northeast wind 14 to 21 mph, with gusts as high as 29 mph. Chance of precipitation is 40%. New precipitation amounts between a tenth and quarter of an inch possible.

Kohala

Today: Scattered showers, mainly after noon. Mostly sunny, with a high near 66. East wind 3 to 6 mph. Chance of precipitation is 40%.

Tonight: Showers likely, mainly after 7pm. Mostly cloudy, with a low around 41. East northeast wind 5 to 8 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

Friday: Showers likely, mainly before 7am. Partly sunny, with a high near 68. Windy, with an east northeast wind 20 to 28 mph, with gusts as high as 40 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

South Big Island

Today: Sunny, with a high near 83. Breezy, with an east wind around 16 mph, with gusts as high as 21 mph.

Tonight: Partly cloudy, with a low around 69. Breezy, with an east northeast wind 16 to 18 mph, with gusts as high as 23 mph.

Friday: Isolated showers after 7am. Mostly sunny, with a high near 83. Windy, with an east wind 21 to 23 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.

Puna

Today: Scattered showers. Partly sunny, with a high near 80. Light east southeast wind becoming east 5 to 9 mph in the afternoon. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

Tonight: Showers likely, mainly after 7pm. Mostly cloudy, with a low around 63. Northeast wind around 5 mph becoming light and variable in the evening. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

Friday: Showers likely, mainly before 7am. Partly sunny, with a high near 80. Light and variable wind becoming east northeast 5 to 7 mph in the morning. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

Waikoloa

Today: Sunny, with a high near 80. Light and variable wind becoming west southwest around 5 mph in the afternoon.

Tonight: Partly cloudy, with a low around 61. East southeast wind 7 to 9 mph.

Friday: Mostly sunny, with a high near 81. East wind around 8 mph becoming north in the morning.

Detailed Forecast

Synopsis

A band of clouds and showers marking a dissipating front will bring wet conditions to windward Oahu and Maui County this morning as trade winds return. Strengthening trade winds and a typical pattern of windward showers is due Friday through the weekend, followed by decreasing trade winds early next week.

Discussion

The remnant moisture left behind by a front moving away to the northeast is bringing overcast skies and showers to Oahu and Maui County with partly cloudy skies and isolated showers remaining over Kauai and the Big Island. Clouds and showers will linger over the central islands today as the trade winds gradually fill in and push moisture into windward areas. High pressure to the north will build through Friday, accelerating northeast trade winds to moderate levels today and become breezy easterly trade winds over the weekend. Typical trade wind weather is expected with showers focused over windward and mountain areas, and a few reaching leeward locations. In the long range, trade winds will likely drop a notch early next week as a disturbance develops west and northwest of the islands. This scenario would turn winds out of the east southeast with some increasing shower potential by midweek as an upper trough moves overhead.

Aviation

Remnant moisture from a dissipating stationary front will continue to bring increased shower activity from Oahu to Maui through this afternoon. However, light to moderate tradewind flow should concentrate the showers along windward locations. Expect brief periods of MVFR ceilings and visibility to accompany this activity.
AIRMET SIERRA remains in effect for tempo mountain obscuration above 2500 feet for north through east facing areas of Oahu, Molokai, and Maui.

Marine

Moderate to fresh northeast trade winds have returned over the Kauai and Oahu waters and should fill in over the eastern end of the state today through tonight as high pressure builds to the north. Trades will become more easterly Friday through the weekend and increase into the fresh to strong category, likely resulting in Small Craft Advisory conditions for the typically windier waters between Maui County and the Big Island. Winds may diminish and shift out of the east-southeast early next week as the ridge weakens in response to a front passing to the north.
Surf along north and west facing shores will trend up today through the weekend as a mix of medium period, north-northwest and long-period, west-northwest swells move through. The medium period, north-northwest swell filled in overnight and should hold through Friday before easing into the weekend. The long-period, west-northwest swell will fill in Friday and peak early Saturday near or at advisory levels for exposed coasts of the smaller islands.
Surf along south facing shores will hold through Friday as a long- period, south-southwest swell moves through. Morning observations at the offshore buoys to the south and the nearshore PacIOOS Barbers and Lanai buoys have been reflecting this new energy within the 18-22 second bands. This source will slowly fade over the weekend. Looking ahead into next week, guidance shows mainly background southerly energy continuing, which should keep the surf from going flat.
Surf along east facing shores will remain small through Friday, then slightly trend up by the end of the weekend due to the fresh trades returning locally and upstream. Downward trend will be likely once again next week due to the trades weakening.

HFO Watches/Warnings/Advisories

None.

Data Courtesy of NOAA.gov