BILLINGS, Mont. (AP) — An early winter storm is forecast to bring the first heavy snowfall of the season to portions of the U.S. Rocky Mountains this week. The National Weather Service on Monday issued winter storm warnings for large areas of Wyoming and southern Montana. The warnings are in effect through midday Wednesday. Up to two feet of snow is expected in the Beartooth Mountains near Red Lodge, Montana, with temperatures well below freezing. Forecasters say the Sheridan, Wyoming area can expect up to 18 inches of snow. Winter weather advisories were issued for portions of Colorado, Idaho, Nevada and Utah.