The week begins with a Freeze Warning across the Valley on Monday night and goes on until Tuesday morning. Areas below 2,000 feet in elevation can expect overnight lows to drop below 36 degrees by Tuesday morning.

A powerful atmospheric river-fueled storm lashing the Pacific Northwest left Northern California under a high risk for excessive rainfall and southern Oregon under moderate risk on Thursday night. The big picture: The heavy rain,

The Weather Prediction Center has placed portions of northern California under a rare Level 4 of 4 risk of flooding Thursday.