Heavy rain caused flash flooding for a second weekend in a row in Windward Oahu, stranding motorists when rising water closed Kamehameha Highway and other roadways.
The area was under a flash flood warning for much of the evening. The warning has since expired and all roadways were reopened around 1 a.m. Monday.
On Oahu, rainfall had diminished to light to moderate levels by Sunday evening, but runoff from earlier heavy rains kept Waikane Stream elevated. The runoff also was slow to drain due to an incoming high tide.
Waiahole Elementary was also opened as a temporary shelter for trapped motorists and others needing assistance.
Kapaa Quarry Road was closed due to flooding. Officials say vehicles were stranded in flood waters on Waiahole Valley Road.
City officials opened the Emergency Operations Center. It was staffed with leaders from multiple emergency response agencies. Bus routes were also being changed in light of the Kamehameha Highway closure.
Kauai Island Utility Cooperative says a power outage was affecting customers from Anahola to Kilauea.
An upper level disturbance brought the threat of heavy rain and thunderstorms to the western end of the state.
The National Weather Service in Honolulu said the trough would cause unstable conditions that could cause heavy showers and thundershowers to develop rapidly and cause flash flooding in a short period of time.
Many areas around the state were saturated from recent heavy rains, and it didn't take much to flood these areas.