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Fast Facts: A line of strong to severe thunderstorms rolled through portions of northern Illinois and northwest Indiana during the afternoon of Sunday, June 30th.  Numerous wind gusts in excess of 60 mph were received with widespread tree damage across the region.  Portions of Kankakee County were particularly hard hit by very high winds.  Damage photos, reports, and radar imagery indicate that straight line winds of 70 to 80 mph occurred near Manteno and Momence where dozens of large trees were damaged--some of which were toppled onto houses and cars. 

Large shelf cloud rolling into Polo, IL. Photo courtesy of Tim Bejster. 

Additional Info

The environment on Sunday, June 30th, was characterized by very warm and moist conditions with dewpoints generally in the low to mid 70s.  Temperatures had warmed into the upper 80s to near 90 degrees during the late-morning and early-afternoon, although slightly cooler and drier conditions existed near the lakeshore behind a lake breeze. A complex of thunderstorms--which developed the evening before across Minnesota and North Dakota--was surging southward across southern Wisconsin late Sunday morning.  As this complex encountered increasingly unstable conditions, strong winds just off the surface began to make it to the ground as widespread damaging gusts to 70 to 80 mph through the afternoon hours across the region.  


Environment Environment Environment
Early-afternoon analysis showing very high instability across the region.  12 PM analysis showing temperatures in the upper 80s and dewpoints in the low 70s. Surface observations at 12 PM ahead of the thunderstorm complex. 
A total of 14 Severe Thunderstorm Warnings (yellow), 2 Special Marine Warnings (purple), and 7 Flood Advisories (green) were issued.  Photo Photo
Map showing all warnings and storm reports on June 30th.  Map showing storm reports (damaging winds in blue) across the lower 48 on Sunday. KLOT Radar loop from 11:59 AM to 5:00 PM. 


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