The worst conditions, including hurricane-force winds, flooding rain and possible tornadoes, are set to hit the the central U.S. on Friday and Saturday. The barrage of extreme weather is likely to lead to travel delays on roads and at airports, and widespread power outages.

Severe thunderstorms, flooding rainfall, damaging winds, wildfires, record temperatures and snow are all possible across the United States.

A powerful storm dropping drenching rain on flood-prone Southern California is raising concern among forecasters that it could produce a dangerous, widespread outbreak of tornadoes, damaging winds and fires along with a blizzard as it crosses the entire United States in the coming days.