Chicago and other Midwest metros at risk for strong tornadoes as multi-day severe weather threat ramps up

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.

​ 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. Read More Breaking News, Latest News and Videos | CNN