A sweeping storm system moving across the U.S. threatens to bring tornadoes, blizzards and possibly wildfires to different regions of the country.

On Thursday, the storm was bringing heavy snow and strong winds to the Sierra Nevada and heavy rainfall over parts of coastal southern California.

Severe thunderstorms and the threat of tornadoes will persist across the Southeast through most of the weekend, while heavy rainfall and high winds associated with the storm are expected in parts of the mid-Atlantic and Northeast by Sunday.

More than 100 million people in the U.S. will be in the path of an intense March storm starting Friday as the sprawling multi-day system threatens fires, blizzards, tornadoes, and flooding as it tracks eastward across the Great Plains.