Storms encase Iowa and eastern Nebraska in ice and generate first tornado warning in San Francisco

OMAHA, Neb. (AP) — A major ice storm has created treacherous driving conditions across Iowa and eastern Nebraska and prompted temporary closures of Interstate 80 after numerous cars and trucks slid off the road. Many events have been canceled across the region, and businesses announced plans to open late Saturday as officials urged people to stay home if possible. But temperatures rose high enough in the afternoon to melt the ice in most places. Elsewhere a storm prompted the first ever tornado warning in San Francisco and caused some damage. And in upstate New York, people are digging out after heavy snow fell.