Inclement weather has plagued areas of the U.S. in the first half of the weekend, with dangerous conditions including heavy snow, a major ice storm and unsual tornado activity

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.

A wide swath of freezing rain has led to multiple crashes across Iowa and Nebraska. FOX Weather’s Brandy Campbell reports live from Cedar Rapids, Iowa where a thick glaze of ice continues to build.

A potent winter storm targeting Northern California this weekend brought what appears to be the first official tornado warning on record for the city of San Francisco on Saturday morning.

San Francisco experienced its first-ever tornado warning early Saturday, stunning residents as a powerful storm swept through the Bay Area, bringing heavy rain and winds. The warning prompted a flood of social media posts from residents startled awake by emergency alerts.

A powerful storm swept through parts of Northern California early Saturday, knocking down trees, causing widespread power outages and prompting weather officials to issue what they said was the first-ever tornado warning for San Francisco.