Illinois Weather Trivia for July 21st
- Thunderstorms formed along a lake breeze in northeast Illinois during the late afternoon and evening. Some damage occurred across Will and Cook Counties, but the main damage was from torrential rainfall. The heaviest rain fell across southwest Cook County, extreme northeast Will County, and central DuPage County. Water burst through a basement foundation in Tinley Park, filling the basement and topping out at 6 feet 11 inches deep. Several homes in Orland Park and Tinley Park had 2 to 4 feet of water in basements. Streets were also flooded in these areas. Some rainfall totals from the event include 3.08 inches in Olympia Fields, 2.79 inches in Park Forest, 2.30 inches in Winfield, and 2.03 inches in Glenwood. There were no reports of injuries.
- Widespread damaging winds, estimated around 90 mph, raked most of Jefferson County in south central Illinois. The city of Mt. Vernon was especially hard hit, where about 14% of all homes received at least minor damage. Several thousand trees were blown down, landing on cars, power lines, roads, and houses. In Mt. Vernon, damage assessments indicated 1,107 homes were affected by some type of damage. 491 homes received minor damage such as roofs blown off, 152 received major damage, and 18 were destroyed. On I-57, several semis were blown off the road or overturned, and a manufactured home was blown onto the southbound shoulder from a deadership located just off the highway.
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