Update, 11:20 a.m. Friday: Selected rainfall totals for the 48 hours ending at 10 a.m. Friday:
|Venado (Sonoma County)||3.32|
|Olema (West Marin)||1.68|
|St. Mary's College (Moraga)||1.1|
|Tilden Park (Berkeley Hills)||0.99|
|San Francisco International Airport||0.59|
Update, 3:50 p.m. Thursday: The National Weather Service is calling for a second round of rain Thursday and early Friday from a storm system that has been pounding the Pacific Northwest for days.
Most locations in the Bay Area will pick up an additional one-quarter to one-half inch of rain before the storm tapers off Monday morning. Hills and locations from northern Sonoma County to the Santa Cruz County will see higher totals.
Forecasters are also warning of "excessively large surf."
The weather service says waves up to 22 feet can be expected along the coast from Sonoma County south through Big Sur, and cautions the ocean conditions carry a triple threat: Waves can be expected to run high up onto beaches and rocks, increasing the risk of people being washed away; the surf will be accompanied by strong rip currents, a potentially deadly hazard to anyone who enters the water; and waves will trigger coastal flooding both inside and outside San Francisco Bay during high tide occurring at midmorning Friday.