A frost advisory is in effect through Tuesday morning for large parts of the Bay Area, as temperatures were forecast to fall into the 30s in places like San Jose, Livermore and Petaluma.
In San Francisco and Oakland, the water will likely help moderate temperatures a bit, but still, temperatures on the Peninsula and west of the Berkeley hills are forecast to drop into the low 40s.
The combination of cold air temperatures and moisture at the surface will almost certainly generate frost on car windows and grassy surfaces on Tuesday morning across much of the Bay Area…