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Heat Wave Expands to the East Coast; Flash Flooding Likely in the Central Plains into the Midwest; Severe Thunderstorms in the Northeast

Dangerous, prolonged heat is ongoing in the Mid-South to Mid-Mississippi Valley and heat expands into the Northeast for a brief period today. Widely scattered instances of flash flooding due to heavy rains are forecast from northeast Kansas to much of Indiana. Scattered strong to severe thunderstorms are possible across parts of New England, northern Mid-Atlantic, and North Dakota. Read More >

Overview

Two rounds of thunderstorms produced significant rainfall across portions of northern Illinois on Monday August 9th. A morning round of storms produced heavy rainfall across parts of northern Illinois, especially across portions of southern Boone and McHenry Counties where up to 3 to 4 inches of rain fell causing instances of urban and small stream flooding. 

 

The afternoon and evening thunderstorms were mainly supercells that produced numerous tornadoes, some of which caused noteworthy tree and structural damage in portions of Ogle, DeKalb, and Kane Counties. NWS Chicago issued a total of 13 Tornado, 2 Severe Thunderstorm, and 3 Special Marine Warnings between 3:00 PM and 10:15 PM. A total of 10 tornadoes were confirmed in the NWS Chicago County Warning Area (CWA). 

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