FLATHEAD NATIONAL FOREST, Mont. — If, on a hot, dry day a fire should break out within a certain 300,000-acre patch of northwest Montana, in an expanse of backcountry between the crest of the Whitefish Range and the glacier-carved peaks that hug the Continental Divide, there’s a good chance Leif Haugen will be the first person on Earth to see it. For the better part of an hour, he might be the only person. Haugen has worked for more than half of his 52 years as a fire lookout, scanning the larch