Heavy showers and possible thunderstorms will move from west to east ahead of an approaching cold front. A Flash Flood Watch is in effect for Niihau, Kauai and Oahu through Monday afternoon because of the threat of heavy rain. The watch will be expanded to include Maui County this evening. For the daytime hours at least, Maui County and the Big Island will have partly to mostly cloudy skies with spotty showers. Light south to southeast winds will continue to spread volcanic haze from the Big Island to the rest of the state.
The front itself will begin moving over the state Sunday night and keep unsettled winter-like conditions to the state through mid-week, including the chance for more snow on the summits of Mauna Loa and Mauna Kea. Trade winds and drier weather are expected to return Thursday, with breezy trades possible next weekend.
A High Surf Advisory is now in effect for the north and west shores of Niihau, Kauai, Oahu and Molokai, and the north shores of Maui, replacing the High Surf Warning that was posted earlier. However, a High Surf Warning is still up for the west shores of the Big Island through 6 p.m. Sunday. A Small Craft Advisory remains in effect for all Hawaiian coastal waters, except Maalaea Bay, due to the large west-northwest swell. Surf will decline through the day Sunday.