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

During the late afternoon and evening of August 24th, a line of thunderstorms moved into northwestern Illinois and produced wind damage in the northern part of the state before weakening as it moved into the Chicago metro. Most of this damage was done to trees and power lines and mainly occurred in DeKalb, Ogle, and Winnebago counties, including inside the city of Rockford.

Additional thunderstorms developed out ahead of the main line and produced a few instances of wind damage and hail. These storms also produced heavy rainfall with over 2 inches of rain falling in the span of one hour in some locations, resulting in localized flooding in northwest McHenry County and northeast Cook County, including the north side of the city of Chicago.

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