Jun 25, 2011
A surface cold front advecting from west to east, coupled with a mid level jet streak, combined with abundant moisture and instability to result in widespread thunderstorm activity during the afternoon and evening hours of June 25th. Numerous reports of large hail and several reports of severe thunderstorm wind gusts were received. ||The overall tornado threat was low due to insufficient deep layer shear, although there was supportive surface vorticity and low level cape which led to one report
Source: NOAA National Weather Service Storm Events Database (event 320038). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in McHenry County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.