A record number of tornadoes are wreaking havoc across parts of the U.S. this month. So what are the key ingredients for a tornado to form:

“Number one is having enough humidity in the air, enough fuel for the storms. That’s really what gets the storms. And then you have to have the proper wind shear, the speed at various heights and different directions at various heights.”

Meteorologist Todd Krause with the National Weather Service in Chanhassen says Minnesota reported the first three tornadoes of the season Monday in southeastern Minnesota.