UPDATE: 10 p.m.

The flood advisory for Oahu has expired. A flood watch remains in effect for Kauai County through late tonight.

4:30 p.m.

The National Weather Service has issued a flood advisory for the island of Oahu, effective until 6:30 p.m. today. The flood advisory for Kauai has expired.

At 3:27 p.m., radar indicated the presence of scattered, heavy showers and thunderstorms over the Koolau and Waianae Mountains and the North Shore. Rain was falling at a rate of 1 to 3 inches per hour in the heaviest showers.

Some locations that will experience flooding include Mililani, Wahiawa, Wheeler Field, Schofield Barracks, Pearl City, Waikele, Waikane, Waiahole, Kunia, Waipahu, Aiea, Punaluu, Halawa, Kaaawa, Kahaluu, Hauula, Ahuimanu, Salt Lake, Laie and Moanalua.

The public should stay away from streams, drainage ditches, and low-lying areas prone to flooding.

A flood watch for Kauai County remains in effect through late tonight.

A high surf advisory issued earlier today for the north- and west-facing shores of smaller Hawaiian Islands, is now effective until 6 a.m. Wednesday.

1 p.m.

The National Weather Service has issued a flood advisory for the island of Kauai, effective until 3:15 p.m. today.

At 12:13 p.m., radar and automated rain gauges indicated heavy rain falling over the northeast portion of Kauai. The heaviest rain was falling between Wailua and Anahola at a rate of 1 to 3 inches per hour.

Some locations that will experience flooding include Kapaa, Princeville, Kilauea, Wailua, Anahola, Moloaa, Hanalei, Wainiha, Haena, Wailua River State Park, Kealia, Hanamaulu and Puhi.

The public should not cross fast-flowing or rising water in a vehicle or by foot, and should stay away from streams, drainage ditches and low-lying areas prone to flooding.

A flood watch is also in effect for Kauai County until 6 a.m. Wednesday.

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A high surf advisory has been issued for the north- and west-facing shores of smaller Hawaiian Islands, effective until 6 p.m. Wednesday.

The National Weather Service expects a northwest swell to peak today, boosting surf to 12 to 16 feet along the north-facing shores of Niihau, Kauai, Oahu, Molokai and Maui.

Surf along the west shores of Niihau, Kauai, Oahu, and Molokai is expected to reach 8 to 12 feet.

Officials warn of strong, breaking waves and currents along these shores, which will make swimming dangerous.

Surf along east-facing shores is expected to remain at 2 to 4 feet today through Wednesday.

Surf along south-facing shores is expected to rise from 3 to 5 feet this morning to 7 to 10 feet on Wednesday due to southwest swells.

The public should heed all advice from ocean safety officials.

A flood watch is also in effect for the isles of Niihau and Kauai through Wednesday morning.

Forecasters say flash flooding caused by excessive rainfall is possible as a low-pressure system approaches the isles from the northwest, bringing unstable conditions. Slow-moving, heavy showers and thunderstorms are expected to develop through early Wednesday morning.

Kauai County residents should be prepared to take action if a flash flood warning is issued.