National Weather Service United States Department of Commerce



Severe thunderstorms developed across all of northern and northwest Illinois on the evening of August 9, 2021. An outflow boundary present from morning storms lead to a favorable environment for tornadic development, with several forming from Bureau County to just west of the Chicago metro area. Three tornadoes occurred during the evening damaging corn, soybeans, and several farmsteads near Arlington, IL. 


KML Link - All damage points + tornadoes


Surrounding Office Summaries

West of Princeton, IL (Betsy Rowland)