There have been flood like weather before in CA just before and after big games. Amazingly the weather almost always cooperates. I remember there were about 2.5 inches of rain before Super Bowl 27, Cowboys-Bills in Pasadena, 2 days before the game. Then Sunday morning and the weather was glorious and the world didn't know any better. I can remember some Rose Bowls just like that too, lots of rain around the game day, but none on it.