An investigation to ( 1) determine the 500-milli-bar level weather patterns associated with tornadoes moving from northwest toward southeast and from southwest toward northeast and, (2) show the significance of the contrasts between the 500-mb. level weather patterns of the two tornado types. A very high relationship between the direction of the 500-mb. level winds and the tornado direction was substantiated by a coefficient of correlation of +0.88. The typical 500-mb. level low center associated with the northwest to southeast type tornado was located over Hudson Bay about 1300 miles north-northeast of the tornado area. The low center associated with the southwest to northeast type tornado was positioned over northeast Montana about 900 miles northwest of the tornado area.
Johnson, A. B.
A Comparison Between The Direction of Tornado Movement and the Associated 500 mb. Level Wind Direction.
Journal of the Minnesota Academy of Science, Vol. 32 No.1, 37-42.
Retrieved from https://digitalcommons.morris.umn.edu/jmas/vol32/iss1/10