1 tornado, as filed by the National Weather Service.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The Quad Cities radar (KDVN), 74 km away, was scanning. The volume nearest the first event began at 21:50 UTC.
1 tornado. Local standard time, as filed.
A tornado briefly touched down on the south side of Lake Calhoun. It blew down between 25 to 30 large trees, some of which fell onto a picnic pavilion destroying it. No injuries were reported and no damage estimate was available.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 1997Every state in 1997This day in weather historyThe tornado archive for Illinois, 1997Warnings in Illinois, August 1997
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5614257.