High pressure building to the northeast will boost trade wind speeds, with the winds becoming gusty for some areas. Winds will shift a bit from the east to east-southeast over the weekend as an upper trough forms to the west of the state. An upper trough over the state will keep more frequent and locally heavy windward showers in the forecast through the weekend. Deeper moisture will move up from the southeast from Sunday into the middle of next week, with an increase in clouds and showers, especially for windward and southeast slopes.
We’re tracking a new northwest swell that will start to rise late Friday night and peak Saturday with waves a high advisory levels or lower warning heights. For Friday, north and west shores will rise just a big by afternoon. East shores will have a choppy swell generated by the trade winds. The increasing winds will push east shore waves to advisory levels as soon as this weekend. South shores will have a slightly larger swell gradually rising Monday and peaking Tuesday. For mariners, a small craft advisory is posted for coastal waters from Oahu to the Big Island due to the strong winds.