This report was based on analysis of photographs showing organized rotating cloud formations responsible for the tornado swarm in the Fargo-Moorhead area.

Black and white photographs of the aftermath of a tornado in Fargo, North Dakota on June 20, 1957.

A guide to tornado formation and lifecycle also covers such topics as forecasting, wind speeds, tornado myths, tornado safety, risks, and records, along with accounts of the deadliest tornadoes in the United States.

The study of the tornadoes of April 2, 1957, at Dallas, Tex., presented here is an assembly of independent efforts on some of the important aspects of these tornadoes and the associated weather situation. Each serves as a separate report on a specific aspect of the study