Story highlights 14 million people under a flood watch or warning in northern, central California

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(CNN) Residents of northern and central parts of California, already drenched by weeks of rain, prepared for possible flooding and landslides as another round of storms pummeled the state.

More than 14 million people are under a flood warning or flash-flood watch and residents have been advised to prepare for evacuations. Six to 10 inches of rain could fall from San Francisco eastward before the storm tapers off, CNN meteorologist Dave Hennen said Monday.

"Gather important items, documents and medications in a 'go bag' in case you need to evacuate quickly," the National Weather Service in Sacramento said in an advisory. " Don't forget to plan for your pets, too. Make sure your vehicles have a full tank of gas."

In Salinas, south of San Francisco, some evacuating residents had to be rescued by boat Monday, CNN affiliate KSBW reported. Other people in Monterey County have been waiting days for electricity to be restored.

"We're on our 56th hour without power now and it's getting a little brisk inside the house," Gary Bolden of Prunedale told KSBW.