As of Friday morning, things appear to be following roughly the same path that they did last week: The real rain isn't expected to arrive until late in the day Sunday (perhaps even later than last week), so early indications are that we will be OK to ride. Temperatures will be similar to last week -- mid-40s at ride-out time -- so bundle up.
While there aren't any ways to chop miles out of the middle of our ride if the weather turns foul, we have an interesting bailout option available between miles 33 and 39. We can take light rail back to Mountain View. It costs $1.75 cash, and it's not at all speedy, but it's dry.
A reminder: On Sunday morning, I'll put a weather update here before 8 a.m.