More than 36 million Americans are on alert for severe weather in the Midwest, with thunderstorms, large hail and a tornado outbreak possible on Monday.

The FOX Forecast Center is monitoring the development of a likely tornado outbreak across portions of the Upper Midwest on Monday, with millions of people in cities like Minneapolis on alert for severe weather.

The severe weather threat extends beyond the Upper Midwest, affecting more than 45 million people from Texas to the U.S.-Canada border.

AccuWeather's Severe Weather Expert Guy Pearson reports on the building storms in the Midwest that are expected to bring strong wind gusts and hail.

It’s not very often that we see this,” one National Weather Service forecaster said of the risk level being predicted for parts of Iowa, Minnesota and Wisconsin.