What is a tornado emergency and how is it different from a warning or a watch?

Tornado emergencies have been called in Michigan, Nebraska, Iowa and more states over the past few weeks during recent periods of severe weather

​Tornado emergencies have been called in Michigan, Nebraska, Iowa and more states over the past few weeks during recent periods of severe weather Tornado emergencies have been called in Michigan, Nebraska, Iowa and more states over the past few weeks during recent periods of severe weather US