A Northern California wildfire twice the size of the city of San Francisco has driven hundreds from their homes and led scores of visitors to leave or avoid nearby Yosemite National Park. Gov. Jerry Brown declared a state of emergency due to the huge wildfire, which nearly quadrupled in size to 99 square miles yesterday. Fire officials said the blaze, which started Saturday, was only 1 percent contained Thursday, down from 5 percent a day earlier. Two homes and seven outbuildings have been destroyed. While the park remains open, the blaze has caused the closure of a 4-mile stretch of State Route 120, one of three entrances into Yosemite on the west side, devastating areas that live off of park-fueled tourism.