Snow and cold nearly emptied national parks in Oregon and Montana over the holiday weekend, and tornadoes in Michigan's Upper Peninsula and northern Wisconsin injured four people. In Wyoming, a cold front carried tornadoes, hail, snow and 60 m.p.h. winds through parts of the state. Snow continued falling in mountainous areas of Oregon and Montana, while on the Oregon coast, power was being restored after high winds knocked down lines. Glacier National Park in Montana, usually filled with tourists on Fourth of July weekend, was nearly deserted as showers and northwest winds gusting up to 40 m.p.h. whipped through.