Forecast: Chance for heavy rain, possible thunderstorms, flash flooding

First Alert Web Forecast for Sunday

HONOLULU, Hawaii (HawaiiNewsNow) - A front lingering near Kauai and a trough approaching from the east are expected to converge over the state Sunday, which will result in numerous showers statewide as the trade winds return. There’s a chance for an upper level low pressure system to strengthen Sunday, which could increase the chance for locally heavy rain and thunderstorms into Monday, placing the state under a flash flood watch through Monday afternoon.

Whether or not you get the heavy rain and rumbles will depend on where the upper low ends up and how strong it is. For now, expect some rather wet trade wind weather to linger over the state through Wednesday, when the low is forecast to weaken. Trade winds could get breezier near the end of the week.

A high surf advisory remains posted for the north and west shores of Niihau, Kauai, Oahu and Molokai, the north-facing shores of Maui and the west-facing shores of the Big Island as a northwest swell continues to build near warning levels. There’s also a small craft advisory up for most windward coastal waters due to the swell. The swell should peak Sunday before slowly lowering. Another advisory-level northwest swell is expected Wednesday or Thursday.

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