Moisture from a stalled cold front will bring heavy rain and isolated thunderstorms for Maui County and parts of the Big Island overnight. The flash flood watch will continue for Oahu, Maui County and the Big Island into at least Tuesday afternoon. The frontal moisture should shift westward with the threat of heavy rain decreasing for the Big Island and increasing over Oahu by Tuesday morning and Kauai Tuesday night. Most of the frontal moisture should be west of the state by Wednesday, with more typical trade wind showers returning for most of the state.
As for the winds, the strong north to northeast winds will gradually decrease by Tuesday, with the wind advisory remaining posted for the smaller islands through 6 a.m. Moderate to breezy easterly trade winds are expected from Wednesday into the end of the week. The trades are forecast to become strong into the weekend.
A high surf warning remains posted until 6 a.m. Tuesday for the possibility of 40-foot face waves peaking overnight. North shores should drop to 20 to 25 feet by Tuesday morning and 16 to 20 feet by afternoon, with west shores at 12 to 16 feet, declining to 10 to 14 feet in the afternoon. East shores will stay up through midweek, thanks to near gale-force winds behind passing fronts. For mariners, a gale warning remains posted for waters around the smaller islands, with a small craft advisory for waters around the Big Island.