Rain is returning this week to the Bay Area – and forecasters are expecting a “potentially major storm system."

An “impressive” atmospheric river is set to deliver multiple rounds of moderate to heavy rainfall across the Bay Area this week, the National Weather Service said, with minor flooding and gusts of up to 50 mph also expected to sweep through the region.

Following a mostly dry January in the Bay Area, as a wet weather pattern returns to the region beginning on the final day of the month.

Northern California weather will continue to be dominated by a long-duration atmospheric river for at least two more days. San Francisco’s wettest period is yet to come, and the Sierra Nevada is bracing for what could be its snowiest week so far this winter.