Illinois Weather Trivia for April 9th
- The first radar image of a tornado was detected by equipment at the University of Illinois Airport, south of Champaign. Studies of the radar pictures from that day showed that a tornado of significant size and intensity could be detected, identified by a hook shape on the southwest edge of a thunderstorm.
- The second of two late-season snowstorms affected much of Illinois over a 3-day period ending on this date. The heaviest snowfall was reported from near Peoria southwest to Macomb, with up to 7 inches of snow. Snowfall in excess of 5 inches was found in a wide area extending from Quincy east to Bloomington.
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