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Overview (Updated 8/1/23)

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SPC Event Summary July 28, 2023

National Weather Service Chicago Event Summary 07/28/2023

 

Event Summary

  • Very hot and humid air in place across eastern Iowa, northwest Illinois and far northeast Missouri interacted with a southward moving frontal boundary and disturbance aloft, setting the stage for development and organization of severe thunderstorms across the region.

  • Storms initially formed from north central Iowa into southern Wisconsin along the frontal boundary, and slowly worked south into the hot, humid air in place across the region

  • As storms arrived across east central Iowa, they began producing winds around 70 MPH across the Hwy 20 corridor. Another storm to the south further intensified, and began producing winds of 80+ MPH as it tracked along the Hwy 30 corridor. This would impact the northern suburbs of Cedar Rapids into Clinton.

  • Due to the strong nature of the storms, cold air was able to rush out well east and south ahead of them (we call this outflow); this produced wind gusts around 60-70 MPH as it progressed into northwest Illinois.

  • One brief tornado EF-0 tornado occurred in Clinton, Iowa. Damage near Andrew, Iowa in Jackson County was determined to be most likely straight line winds.

    Storms additional produced large hail around the Dubuque metro, with quarter size hail reported.
Surface Analysis (WPC)

 

Fast Facts Infographic Observed Maximum Wind Gusts Infographic

 

 

 

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