Wildfire activity intensified across the western United States over the weekend, with strong winds and dry conditions fueling flames and forcing evacuations in many spots. The largest blaze was marching through dry, rugged mountains in Utah, where firefighters have been hampered by consecutive days of strong winds. Authorities were surveying burned areas to determine how many homes and summer cabins were destroyed. In Arizona, evacuations were ordered north of Flagstaff while a separate fire burned south of the Grand Canyon. Fires also were burning in Nevada, New Mexico, Colorado and even Florida.