Hotter, windy weather challenged firefighters yesterday on several large rangeland fires in eastern Oregon.   One of the largest estimated at 50,000 acres after it jumped and closed a highway into Nevada.  The Bureau of Land Management's Vale District reported multiple lightning strikes around 6 p.m. Sunday.  The Long Draw Fire, located about 20 miles south of Burns Junction, grew to an estimated 450,000 acres by Wednesday afternoon as erratic winds pushed the fire over control lines and forced the evacuation of Oregon Department of Transportation Basque Station located on U.S. Highway 95.  As the fire spread Monday toward the Basque Station Facility, crews from control lines surrounding the station used fire to burn the fuels as the main fire approached the facility. The structure was not lost.