The boundaries on this look very odd to me. I wonder what kind of model and terrain resolution they use for this forecast.

It seems very odd how some quite low lying shore areas in the SF Bay are excluded while other areas are painted over very high elevations including the SF peninsula and Oakland/Berkeley hills.

For the East Bay it looks like they drew a very rough outline of the contour of the hills and then pushed it an extra half mile or so inland, which results in some clearly safe spots landing inside the line.