A severe winter weather event is affecting approximately 20 million people across the West and Midwest, with heavy snow and dangerously cold conditions forecasted. Multiple winter storm warnings and advisories are currently in effect as states prepare for considerable disruptions caused by up to several feet of snow. Travelers are advised to exercise caution due to expected hazardous conditions, slick roads, and potential frostbite risks. As heavy snow continues to fall, areas like Montana are particularly braced for major accumulations, with significant impacts anticipated from Friday into the weekend. Citizens are urged to stay updated on weather forecasts and take necessary precautions during this prolonged winter event.