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.

As many as 10 tornadoes touched down in Minnesota and western Wisconsin on Thursday as storms pushed east. Storms begin to push into northern MN, WisconsinWhat we knowThe worst of the storms have passed out of the Twin Cities metro but tornado warnings have been issued in parts of northern Minnesota and western Wisconsin as the storms push east.

According to the Storm Prediction, the strongest storms could generate hail up to 3 inches in diameter (the size of baseballs and large apples) and strong tornadoes.