The death toll rose to six after a fourth Michigan fatality was confirmed in Cass County following a violent tornado outbreak in the USA.Governor Gretchen Whitmer activated the State Emergency Operations Center as three deaths were reported in Branch County near Union Lake.These losses join the deaths of Jodie Owens and her daughter Lexi, whose vehicle was destroyed near Fairview, Oklahoma, on Thursday night.Experts warn that seven million people face high-risk conditions as the severe weather system stretches from Dallas north to Milwaukee.