The governors of California and Nevada on Wednesday planned to tour the state line area blackened by one of several massive wildfires that have destroyed dozens of homes in the West. Cooler weather and even some rain helped in the battle against some of the largest blazes but fire officials warned that hotter, drier weather will return later in the week and could pose a threat of renewed fire ferocity. California Gov. Gavin Newsom and Nevada Gov. Steve Sisolak, both Democrats, planned a brief morning tour of damage from the Tamarack Fire south of Lake Tahoe. The 106-square-mile (275-square-kilometer) blaze was more than halfway surrounded by containment lines. At least 23 buildings have burned since lightning sparked the fire on July 4.