OTIS, Ore. — Wildfire smoke was thick when Tye and Melynda Small went to bed on Labor Day, but they weren’t too concerned. After all, they live in a part of Oregon where ferns grow from tree trunks and rainfall averages more than six feet (1.8 meters) a year. But just after midnight, a neighbor awakened them as towering flames, pushed by gusting winds, bore down. The Smalls and their four children fled, leaving behind 26 pet chickens, two goldfish and a duck named Gerard as wind whipped the blaze into a fiery tornado and trees exploded around them. When it was over, they were left homeless by a peril they had never imagined. Only two houses on their street in Otis survived a fire they expected to be tamped out long before it reached their door less than six miles (9.6 kilometers) from the Pacific.