Death toll rises to 14 from California winter storms as Biden declares emergency

US President Joe Biden declared a federal state of emergency Friday in the state of California as back-to-back winter storms have already left at least 14 people dead.

At least one death occurred during the current severe weather system. The unidentified individual was killed when a roof collapsed at a coffee warehouse in Oakland, the Los Angeles Times reported, citing authorities.

"There's a risk of flooding, rock and mudslides and heavy snowfall, increasing the likelihood of road closures and avalanches," the California Department of Transportation tweeted.

Emergency officials issued evacuation warnings Friday to areas expected to be hit hardest by the next bout of severe winter weather.