several US states covered in snow

Snowfall was effective over the weekend in the western US states of California, Oregon, Washington, and Nevada. Snowfall in Seattle, Washington, may cause traffic disruptions, the US National Meteorological Service stated. Residents of Portland, Oregon were warned last night that the cold would become more severe. The streets of Reno, Nevada, turned white after a heavy snowfall. Due to poor visibility, Interstate 80 highway in California was closed to traffic. Southern California was hit by thunderstorms over the weekend. Flooding and power outages were reported in some areas.