California wildfires threaten towns, wineries ahead of dangerous weekend

California fire crews deploying water-dropping helicopters made a defensive stand on Friday against flames raging in the foothills of the Napa Valley wine region as forecasts called for a return of dangerous high winds and hot weather this weekend.Among them were the stately Chateau Boswell Winery north of Napa, and a farmhouse at the landmark Castello di Amorosa winery, where the castle-like main building survived.Thick smoke poured over deserted Napa Valley communities that would typically be