UPDATE: 7:30 p.m.
The flood advisory for the Big Island has expired.
A flood advisory has also been issued for the Big Island.
At 4:04 p.m., radar indicated heavy showers with rain falling at 1 to 2 inches per hour over portions of Saddle Road above Hilo and near Waimea.
Forecasters predict Hilo, Pohakuloa Camp, Pohakuloa Training Area and Waikii will experience flooding.
The advisory is in effect until 7:30 p.m.
The National Weather Service has issued a flood advisory for the island of Oahu, effective until 5:30 p.m. today.
At 2:29 p.m., radar indicated heavy showers over the Koolau Range, Central Oahu, and the North Shore. Rain was falling at a rate of 1 to 3 inches per hour, and is expected to continue through mid-afternoon.
Some locations that will experience flooding include Honolulu, Waipio, Mililani, Wahiawa, Waikane, Pearl City, Waiahole, Wheeler Field, Waikele, Aiea, Kahaluu, Halawa, Schofield Barracks, Punaluu, Kunia, Waipahu, Kaaawa, Ahuimanu, Hauula and Salt Lake.
The advisory warns the public to stay away from streams, drainage ditches, and low-lying areas prone to flooding. Minor flooding is also expected to occur on roads, in streams, and poor drainage areas.
If flooding persists, NWS said the advisory may be extended beyond 5:30 p.m. today.