Wildfires continued to scorch large swaths of the western United States on Sunday, with firefighters doing their best to corral a host of blazes despite high temperatures, low humidity and possible lightning in many locales. Two of the biggest, still raging conflagrations are in Idaho’s expansive Salmon-Challis National Forest, one of several places -- along with most of the rest of the Gem State as well as parts of Oregon, Utah and Montana -- where the National Weather Service issued red flag warnings through at least Sunday night. The largest is the Halstead Fire, centered about 18 miles northwest of Stanley, according to InciWeb, a U.S. government-operated multiagency fire response website.