National Weather Service United States Department of Commerce


Fast Facts:

  • A tropical-like air mass that was extremely rare for October results in a period of very heavy rainfall late Wednesday evening into very early Thursday morning, primarily between 11 PM and 2 AM.
  • The area that saw training...or multiple showers and storms...was DuPage into central Cook County, including the immediate north side of Chicago, where over 2 inches of rain fell.
  • This resulted in flash flooding, especially under viaducts, including those under Lake Shore Drive which resulted in the closure of the major road for nearly two hours.
  • The likelihood of heavy rain and the potential for flooding within the region during this period had been mentioned in the forecast since the weekend.
Summary Graphic
Event Summary
nws logo Media use of NWS Web News Stories is encouraged!
Please acknowledge the NWS as the source of any news information accessed from this site.

Additional recaps can be found on the NWS Chicago Past Events Page
nws logo