Winter storm furiously results in San Francisco's 1st tornado warning

A major ice storm created treacherous driving conditions across Iowa and eastern Nebraska this weekend and prompted temporary closures of Interstate 80 after numerous cars and trucks slid off the road.

Many events were canceled across the region when the storm hit Friday evening, and businesses announced plans to open late Saturday as officials urged people to stay home if possible. Temperatures rose high enough in the afternoon to melt the ice in most places, however.

At least one person died in a crash caused by the icy roads in eastern Nebraska.

The Washington County Sheriff's office said a 57-year-old woman died after she lost control of her pickup on Highway 30 near Arlington and hit an oncoming truck. The other driver sustained minor injuries.

Elsewhere a storm and wind gusts of up to 60 mph (96 kph) prompted the first tornado warning in San Francisco and caused some damage.

Parts of neighboring San Mateo County were also included in the warning, which went out at 5:51 a.m. to about 1 million people in the area and was lifted about 20 minutes later.