A pair of blustery, soaking storms will stream into Northern California beginning Friday, bringing as much as 10 inches of rain south and east of the Bay Area by Christmas Day and setting up potentially difficult travel conditions for those escaping for the holidays. Though computer weather models differ on the exact trajectory and strength of the two separate weather systems, meteorologists are bracing for sizable amounts of rain and the possibility that some rivers might overrun their banks. "No matter how you slice it, it's going to be a significant weather event," said Rob Hartman, lead hydrologist with the...