After four days of heavy rain in Northern California, authorities are urging people in the area to evacuate their homes — rivers are threatening to crest above flood level, The Associated Press reported early Wednesday morning, even as more rain was expected.

Some 2,000 residents of Wilton, near Sacramento, were asked to leave their homes on Tuesday night ahead of overflowing rivers in Sacramento County.

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One Sacramento County emergency services official said water was expected to start flooding low-lying roads and buildings with as much as a foot of water. Many of the homes along the path of possible flooding are built on berms or sit on relatively higher ground.

An evacuation center opened Tuesday evening in neighboring Elk Grove, but some residents said they plan to stay put.

And as the AP also reported, some 3,000 Sonoma County residents were under an evacuation advisory: The Russian River rose again under pounding rain.