A 275-year-old oak tree in the Napa Valley is one of the latest casualties of the storms battering the North Bay. The tree went crashing to the ground early Monday morning. For years it shaded picnic tables at the V. Sattui Winery in Saint Helena. The fall also broke a pizza oven and several picnic tables. The winery’s president estimates the price of the tree falling at 35-thousand-dollars, but calls the tree priceless.