© National Weather Service Forecast Office
This image shows tornado reports from Wednesday's outbreak. There were more than 160 reports of tornadoes, most of which were in Mississippi, Alabama and Tennessee.
A 150-mph jet stream was one of the key players in why Wednesday's historical tornado outbreak in the South was so devastating. The persistent presence of a strong jet stream over the South is the main culprit in why this April has been such a terrible month for tornadoes.