National Weather Service United States Department of Commerce

Cold Front Dropping South Across the Western U.S.; Watching Threat for Tornadoes and Flooding in the South

A cold front will push south across the Western U.S. into Tuesday with mountain snow and areas of gusty to high winds. An area of low pressure will form along this front on Tuesday and bring a potential for severe thunderstorms with tornadoes and excessive rainfall in the lower to mid Mississippi River Valley. To the north, heavy snow is possible in parts of the upper Midwest. Read More >

Overview

Fast Facts:

  • There were multiple rounds of thunderstorms across northern Illinois and northwest Indiana on Monday, September 3 (Labor Day), with multiple strong to severe thunderstorms during the afternoon.
  • The most impacting aspects of this event are shown to the right, including flooding, wind damage, and possibly a couple brief, weak tornadoes.
  • A storm tracked from northwest Ogle County to near Rockford in Winnebago County, with low-level rotation and multiple low funnels.  While a preliminary brief tornado was reported in Rock Cut State Park, there was no damage found in the park. 
  • A strong downburst, as evidenced by radar and the tree damage, occurred in Wayne, IL (DuPage County).
  • A brief weak tornado occurred on the west side of Chicago during the afternoon.
  • Flooding occurred in parts of the northern and northwestern Chicago metro area, including road closures such as I-190 near O'Hare Airport.
  • This was the wettest Labor Day on record in Chicago, with measured 24-hour rainfall of 1.79" at O'Hare topping the Chicago record of 1.49" in 1912.



Summary
Overview
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Additional recaps can be found on the NWS Chicago Past Events Page
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