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.

Maryland thunderstorms could bring damaging winds. There's also a small chance of a tornado, hail and flooding. See the latest timeline.

The National Weather Service predicted extreme weather across a vast swath of the country with a population exceeding 100 million people.