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 >


Fast Facts:  Thunderstorms brought torrential rain, flash flooding, hail and damaging winds to northern Illinois Friday afternoon and evening. Radar estimates and surface rainfall measurements indicate a swath of 3-8" of rain fell roughly along the I-80 corridor.

  • Heaviest Rainfall amounts included: 8.03 at Channahon, 7.87 inches at Peotone, 7.61 inches at Seneca, 7.53 at Morris, and 7.52 inches at Valparaiso  
  • Chicago O'Hare Daily Rainfall record set: 2.28 inches


Observed Rainfall - 24 hour period ending 10 am Saturday September 28

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