On May 29, 1982, a deadly F4 tornado carved a 17-mile long path across Williamson County, Illinois, including the city of Marion. At times, the tornado was nearly a quarter mile wide. The tornado first touched down about 3 miles northwest of Carterville around 3:05 p.m. After moving southeast across Carterville to Crainville, the twister then paralleled Illinois Route 13 through Marion. On the ground for nearly 30 minutes, the tornado claimed 10 lives in Marion, injured nearly 200, and left approximately 1,000 persons homeless across Williamson County.
The first two radar images were taken at 3:00 and 3:10 p.m. CDT respectively from the St. Louis WSR-57. The second two images are enlarged copies of the first two images for easier viewing. The final radar image is a loop of the third and fourth images. The strongest storm in the center of the image is the storm that produced the first reported tornado touchdown west-northwest of Carterville, Illinois at 3:05 p.m. CDT.http://www.crh.noaa.gov/pah/?n=1982_Track
With no mapping of any kind on those radar screens it must have been a task to know where the storms were.