The light rain that fell across Los Angeles County on Monday increased the number of traffic collisions by 51 percent, according to California Highway Patrol statistics.
There were 45 collisions between 4:30 p.m. and 8:30 p.m. last Monday in areas of Los Angeles County patrolled by the CHP and 68 during the same period today.
In heavier rain, collisions normally jump by at least 100 percent, officials said.
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The storm also knocked down trees and powerlines, causing a power outage in Hacienda Heights that affected more than 1,000 Southern California Edison customers.
The rain was expected to clear out early Tuesday.