An atmospheric river dumping rain across Northern California and several feet of snow in the Sierras was making its way across the state Friday, bringing flooding and threatening mudslides along with it.

A second bomb cyclone is forming over the Pacific Ocean on Thursday that will re-launch a strong atmospheric river into the San Francisco Bay Area on Friday, forecasters said. “A secondary surface cyclone is forecast to develop off the Northern California coast (Thursday).

In northern California, flood and high wind watches were in effect, with up to 8 inches (20 centimeters) of rain predicted for parts of the San Francisco Bay Area, North Coast and Sacramento Valley.