Jun 28, 2017
Low pressure moving along a cold front helped produce supercell thunderstorms with large hail, damaging winds, and tornadoes over much of Iowa the afternoon and evening of June 29th, 2017. This event produced two EF2 tornadoes between Cedar Rapids and Dubuque, Iowa, and a few other weak tornadoes in eastern Iowa. These storms continued to produce damaging winds and flash flooding as they moved across northwest Illinois.
Source: NOAA National Weather Service Storm Events Database (event 700630). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Stephenson County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.