Chicago recently broke a 77-year-old rainfall record, with 6.17 cm of rain recorded in a single day at O'Hare International Airport. This significant weather event has led to flood alerts across a vast region, spanning from Iowa to Michigan, including Illinois, where the record was set. The National Weather Service (NWS) has issued a flood warning, highlighting the risk of water levels exceeding flood stage. Persistent storm systems in the Midwest are the cause of this excessive rainfall.