A Beyoncé concert in Chicago was delayed amid storm activity that threatened to bring a dangerous mix of weather hazards, including large hail, intense wind gusts and strong tornadoes.

Cities such as Chicago, Minneapolis and Milwaukee are at risk for a severe weather outbreak, forecasters said.

A busy stretch of severe thunderstorms is underway due to record heat and now the threats are ramping up, putting major metro areas from Chicago to Nashville under threat as the country hits the peak of tornado season.