The first notable atmospheric river of the season is due to impact Northern California this week and could bring heavy rain and flood risk to the Bay Area, according to the National Weather Service.

Sunnyvale has long been seen as one of the safest cities in the Bay Area and state of California. But the union who represents public safety officers in that city said that’s changing.

A "strong" atmospheric river appears poised to soak Northern California, including parts of the North Bay, later this week, ...