Abstract
The introduction in this paper is a discussion of mesoscale, 10 to 100 miles in horizontal dimension, followed by a report of the recent work done by the Severe Local Storm Research Project at The University of Chicago. A study of radar echoes revealed the fact that the movement of individual echoes and that of the squall-line are quite different. Analysis shows that a mesosystem seen in Japan had features similar to those usually seen in the United States. It is concluded that international attention and cooperation to the study of this scale is important.
