OMAHA, Neb. — A tornado near a mall in central California swept up cars, uprooted trees and sent several people to the hospital. In San Francisco, authorities issued the first-ever tornado warning.
Elsewhere, inclement weather plagued areas of the U.S., with dangerous conditions including heavy snow in upstate New York, a major ice storm in Midwest states and severe weather warnings around Lake Tahoe.
The ice storm beginning Friday evening created treacherous driving conditions across Iowa and eastern Nebraska on Friday and into Saturday and prompted temporary closures of Interstate 80 after numerous cars and trucks slid off the road. In upstate New York, more than 33 inches (84 centimeters) was reported near Orchard Park, which is often a landing point for lake-effect snow.
On Saturday, a tornado touched down around 1:40 p.m. near a shopping mall in Scotts Valley, California, about 70 miles (110 kilometers) south of San Francisco. The tornado overturned cars and toppled trees and utility poles, the National Weather Service said. The Scotts Valley Police Department said several people were injured and taken to hospitals.
In San Francisco, some trees toppled onto cars and streets and damaged roofs. The damage was due to 80-mph (130-kph) straight-line winds, not a tornado, weather service meteorologist Dalton Behringer said Sunday.
Roger Gass, a meteorologist in the weather service's office in Monterey, California, said the warning of a possible tornado in San Francisco was a first for the city, noting an advanced alert did not go out before the last tornado struck nearly 20 years ago.
''I would guess there wasn't a clear signature on radar for a warning in 2005,'' said Gass, who was not there at the time.
The fast-moving storm prompted warnings for residents to take shelter, but few people have basements in the area.
