https://www.mercurynews.com/2021/10/22/atmospheric-river-storm-flash-flood-watch-issued-sunday-could-be-wettest-day-in-more-than-two-years-in-bay-area/

Highlighting a remarkable beginning to the winter rainy season, the National Weather Service on Friday issued a flash flood watch for parts of the Greater Bay Area as a powerful storm continued to churn toward Northern California, bringing with it heavy rains and gusty winds in a collision course with the region on Saturday night and Sunday.

The storm remains a category 5 atmospheric river storm — the highest on a scale of 1 to 5 — and is forecast to deliver the most rain Sunday to the Bay Area of any day in more than two years.