June 10th+11th Severe Storms and Heavy Rain

Overview

Several rounds of thunderstorms moved through the region Wednesday and Thursday that brought heavy rain, damaging wind, and several brief tornadoes to eastern IA, northwest IL, and northeast MO. The more widespread wind damage occurred Wednesday afternoon June 10th from a derecho that developed in eastern Iowa and moved east. This downed trees, power lines primarily along and north of I-80. The more significant winds between 70-80 mph winds were seen north of the Hwy 20 corridor. A second round of storms later on produced isolated wind damage, including some damage north of Geneseo, IL that was due to straight-line winds.

Additional storms developed Thursday morning and again during the afternoon and evening hours with heavy rain and sporadic severe wind. Four brief tornadoes also were reported that did not cause any known damage and were each rated as an EF-U.

Tornado Infographic - June 11th


Storm Report Infographic	Preliminary Classification of a Derecho on June 10th by the NWS Storms Prediction Center (SPC)	Heavy Rain Infographic Click here for list of highest reports
Surrounding NWS Web Summaries
NWS Chicago - June 10th June 11th	NWS Central Illinois - June 10th-11th	NWS Des Moines - June 11th

Storm Reports
Radar
Environment

Storm Reports

Nationwide Summary of Storm Reports (SPC)

Interactive Map of Storm Reports (SPC)

Nationwide Summary of Storm Reports (SPC)

Interactive Map of Storm Reports (SPC)

Radar / Photos


Wednesday June 10th IEM Radar Loop	Thursday June 11th IEM Radar Loop	June 10th Photos	June 11th Photos

Environment

Hodograph Image

Thursday, June 11, 12 PM Surface Analysis
Depicts the rain cooled air from the morning MCS across northern and central CWA locations that resulted in a tight low-level thermal and moisture gradient from west central to north central Illinois. This would be the breeding ground for supercell storms, with the most pristine, non-interfering storms developing just east-southeast of our area.

Thursday, June 11, 4:35 PM KDVN Radar Vertical Wind Profile (VWP)
Showcases the impressive low- and mid-level wind field, with significant turning and speed increase. This resulted in rotating storms as far north as near I-88, but most of these were slightly elevated storms. The more boundary-layer rooted rotating storms occurred south of I-80.

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