HONOLULU, Hawaii (HawaiiNewsNow) - A flash flood watch will begin Wednesday at noon as a front sags down over Kauai and Oahu from the north.
A front approaching from the north, combined with a developing upper level disturbance, will support increased rainfall coverage across the western half of the state Wednesday.
Thunderstorms and heavy rain will be possible mainly over Kauai and Oahu.
Drier trade wind weather will return Thursday and remain into Saturday.
Increasing humidity and showers are possible later on Saturday and through the weekend.
On Saturday, a weakening front over the Northwest Hawaiian Islands may push the high pressure generating our trades far enough east to shift the trade winds from the east-southeast. This slight shift in wind direction may be enough to allow some tropical moisture to flow over the eastern half of the state Saturday afternoon and night. This would increase humidity and trade wind showers mainly for the Big Island and Maui County.
Surf is expected to remain below advisory levels along all shores through early next week.
A small northwest swell from Hagibis will peak Thursday.
A small north swell is expected to peak Friday and a new northwest swell may arrive next Tuesday night.
A series of south swells will continue, but they will all remain rather small.