National Weather Service surf and flood advisories for Maui County remain in effect through Friday.
A high-surf warning has been posted for north- and west-facing shores of Maui and Molokai.
A high-surf advisory is in effect for west-facing shores of Molokai and Lanai.
The warning and advisory are in effect from 10 a.m. today to 6 p.m. Friday.
A strong low-pressure system in the northwest Pacific Ocean has generated a large west-northwest swell that hit the Hawaiian Islands on Wednesday night, the weather service said. The swell will produce large and hazardous surf - 10 to 15 feet - along exposed shorelines today to Friday.
Beachgoers and surfers are advised to exercise caution.
A flash flood watch remains in effect until early Friday morning but a flood advisory was posted for Maui by the weather service Wednesday afternoon.
Radar showed a nearly stationary system of heavy rain dropping 1 to 3 inches per hour near Ulupalakua at about 3 p.m. Wednesday, the weather service said.
The flood advisory that continued through the early evening included Wailea and Makena as well.
A cold low-pressure system moving over the eastern part of the state is the cause of heavy rain and thunderstorms that is expected through tonight, the weather service said.
The flash-flood watch currently in effect will continue through 6 a.m. Friday.
The forecast for today is mostly cloudy with a slight chance of thunderstorms. Showers are likely over windward and mountain areas with scattered showers in leeward areas. Highs will be 79 to 84 degrees with lows from 67 to 72 degrees. Winds will be easterly 15 to 20 mph.