Background: Approximately twenty-five years ago, RIDOT stopped using granite curbing as a. standard, with the exception of bridge projects. The primary motivation was cost, as precast. concrete, the replacement, was cheaper to purchase and install.
Longest damage path and duration: The Tri-State Tornado. The longest recorded tornado journey in U.S. history was the Tri-State Tornado of 1925, which traveled almost 220 miles across southeastern Missouri, southern Illinois, and southwestern Indiana during its 3.5-hour life. The average tornado travels about 5 miles.
Tornado Information for Mokena, Illinois. Mokena, IL is a Very High Risk area for tornados. According to records, the largest tornado in the Mokena area was an F5 in 1990 that caused 350 injuries and 29 deaths. *Tornado risk is calculated from the destruction path that has occured within 30 miles of the location.