Second race of the 2012 Santa Rosa Cup CX Series and with it mud and rain! The rare NorCal wet weather timed itself perfectly for the day's event. Earlier racers were losing derailleurs left and right. Then the sun fought its way through the clouds and the course dried up a bit. But by the last race it was cold wind, clouds, and rain that forced their way back in.
More info here: bikemonkey.net/events/srcupcx/