Here’s a look back at what happened in the Chicago area on Aug. 17, according to the Tribune’s archives.

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Weather records (from the National Weather Service, Chicago )

High temperature: 98 degrees (1988)

Low temperature: 48 degrees (1976)

Precipitation: 2.6 inches (1979)

Snowfall: None

Vintage Chicago Tribune: Our grand, old flag

1915: Lucy Derwent of Rockford won a $25 prize (almost $800 in today’s dollars) from the Daughters of the American Revolution for her design of a state flag for Illinois — a field of blue on which a circle of white bears the state’s coat of arms. Derwent, who later lived in the Chicago area, presented her prize to the Rockford chapter of the D.A.R.

1970: “Soul Train” premiered in Ch

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