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A high-surf advisory remains in effect for the north and west shores of Oahu, Molokai, Kauai and Niihau and the north shore of Maui.
The National Weather Service said a northwest swell will bring surf in the range of 15 to 20 feet for the north shores of those islands, and 12 to 16 feet for the west shores.
The swell will peak tonight, then subside through Wednesday, the weather service said. The advisory is set to expire at 6 p.m. Tuesday.
A small-craft advisory also was in effect for Hawaii waters, with gusty trades and seas of up to 12 feet.
Meanwhile, Hawaii was under a flash flood watch Sunday. The watch was due to be lifted at 6 a.m. today but could be extended.
The weather service said an upper-level disturbance interacting with deep moisture from an old front had the potential to produce bouts of heavy rainfall and thunderstorms. The greatest flood threat was to windward portions of Maui County and the Big Island. Chances for flooding on Oahu were expected to decrease steadily overnight.