Before we forget, rain is good, but lightning is bad. I was waiting in line at SFGAdv when Lightnin' Loops was still operating (but only one side). I was at the top overheard the ride ops talk about the spotters looking for lightning and that they would shut the ride down at the first sign. Lightning came down the ride after mine and they immediately sent people away.
On another note, some coasters are put on a reduced schedule. I was waiting for Medusa in the rain and with 3 train opeeration, only *ONE* was allowed to run due to the braking system (apparently, the floorless coasters with a heavy load will overshoot and skid along the tires and keep going, which throws the computer sensors off, or so I'm guessing). It also felt a lot faster through the high speed helix since the mid-course brakes did nothing.