The National Weather Service extended a flash flood warning for Kauai this morning as heavy rain continues to fall over the island, flooding roads and causing at least one landslide. Oahu, Kauai and Niihau are under a flash flood watch through late tonight.

“A moist and unstable air mass over the western portion of the island chain is resulting in conditions that are conducive for the development of heavy rain and thunderstorms,” weather service forecasters said this morning.

Rockslides and propoerty damage are possible, they warn.

Forecasters also placed Windward Oahu areas under a flood advisory until 9 a.m. due to an area of heavy rain over Oahu that was nearly stationary. The areas under the advisory include Punaluu, Pupukea, Laie, Kahuku, Kaaawa and Hauula.

On Kauai, forecasters say the Hanalei and Wailua rivers are above flood stages.
Kuhio Highway is closed near Lumahai because of a landslide and is also closed near the Hanalei Bridge because of flooding. Flooding also closed Koloa Road and Waha Road, civil defense officials said. The warning remains in effect until 8:45 a.m.

A warning means flash flooding is imminent or already occurring in streams or low-lying areas. The weather service advises the public to move to higher ground. Forecasters also advise the public to beware of hazardous driving conditions.

An advisory indicates that conditions are conducive to flooding. The public should stay away from streams, drainage ditches and low-lying areas, officials said.
Heavy rain on Saturday led to multiple advisories throughout the state.

A gale warning is also in effect for Hawaiian waters and a winter weather advisory for Hawaii island summits because of freezing rain and hazardous road conditions.

The weather service forecasts more rain for Kauai and  the possibility of thundershowers through Monday. Scattered showers, possibly thundershowers are also in the forecast for Oahu and Maui.

Northeast winds of 29 to 40 mph were forecast for Sunday and Monday, with seas building to up to 19 feet Sunday and 20 feet on Monday. The wind and seas were expected to diminish Tuesday and Wednesday.

A high surf advisory was in effect for the north and west shores of Kauai and Niihau and the north shores of Oahu, Molokai and Maui. The advisory, in effect until 6 a.m. Tuesday, predicted waves of 12 to 16 feet.