A wildfire that's forced hundreds of evacuations in Pierce County has tripled in size since Tuesday morning and is threatening more homes. The Sumner Grade fire in the Bonney Lake-Sumner area has burned more than 150 acres and destroyed four homes, forcing more Level 3 (get out now) evacuations overnight. Four homes have been destroyed in this fire, in addition to the homes destroyed in a separate fire in Graham. Cars were packed to the brim trying to get out of the area Wednesday morning. The Bonney Lake Senior Center will serve as the evacuation center for families who need assistance. The fire was 20 percent contained as of Wednesday morning.