Aug 4, 2014
Thunderstorms trained over portions of northern Illinois including the Chicago Metro area for several hours during the evening of August 4th. The highest storm total rainfall reports came in at over four inches, including 4.45 inches near Berwyn and 4.12 inches near Westchester, both in Cook County.
Source: NOAA National Weather Service Storm Events Database (event 540331). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Cook County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.