UPDATE: 9 a.m.

The flood advisory for Oahu has expired but a flash flood watch remains in effect for Oahu and Kauai County.

The flash flood watch is in effect through 6 p.m.

Abundant moisture along with a low-level trough will move westward through Oahu and Kauai today, bringing the chance of heavy rain, weather officials said. The heaviest rains are expected over windward and mauka areas.

Flood-prone roads and other low-lying areas may be closed due to elevated runoff and overflowing streams, the National Weather Service said. Urban areas may also be more likely to flood due to rapid runoff.

6:05 a.m.

A flood advisory has been posted for Oahu due to rain over the windward side of the island.

The advisory runs through 8:45 a.m. today.

At 5:38 a.m., radar showed moderate to heavy rain over Windward Oahu falling at a rate of up to 0.5 to 1 inch per hour, according to the National Weather Service. Area streams are showing a slow but steady rise with minor flooding of low-lying and poor drainage areas to be expected.

Locations in the advisory include, but are not limited to, Honolulu, Waiahole, Waikane, Kahaluu, Ahuimanu, Kaaawa, Aiea, Pearl City, Halawa, Punaluu, Moanalua, Mililani, Kaneohe, Salt Lake, Kalihi, Wahiawa, Kaneohe Marine Base, Hauula, Wheeler Field and Maunawili.

The public is advised to avoid streams, drainage ditches and low-lying areas prone to flooding.

Meanwhile, the summits of Hawaii island can expect to see 1 to 2 more inches of snow today.

An earlier winter weather advisory has been extended through 6 p.m. today. Weather officials say an upper-level disturbance will keep clouds and snow showers for the summits of Mauna Kea and Mauna Loa.

People traversing the area are advised to plan for slippery, icy road conditions and low visibility in freezing fog.

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A flash flood watch remains in effect for most Hawaiian islands today as a storm system lingers over the state.

The National Weather Service in Honolulu has issued a flash flood watch from Oahu to Hawaii island through this afternoon.

“Abundant moisture from a stalled front near the Big Island will continue to bring the threat of flash flooding through Tuesday.” forecasters said Monday evening. “The greatest areas of risk will be over windward and mountain areas. This moisture will gradually shift westward on Tuesday and will bring increasing chances of heavy rain to Oahu.”

Forecasters said landslides may also occur in areas with steep terrain.

The weather service said that windy and wet weather will continue over Oahu and Kauai through this afternoon.

From Wednesday through the end of the week, moderate to breezy tradewinds are expected.

A high surf warning for north and west shores of Niihau, Kauai, Oahu and Molokai, and north shores of Maui is expected to expire at 6 a.m. today.

Surf will gradually diminish through today, forecasters said.

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