Dec 11, 2021
A rapidly intensifying storm system tracking northeastward through the Quad Cities area produced strong low-level southerly flow over central Indiana, including a low level jet (LLJ) of 70 mph at the 850 mb level, during the evening and overnight of the 10th. These winds near the surface brought unseasonably high dewpoints as high as the low to mid 60s that destabilized the atmosphere, while the LLJ resulted in anomalously high vertical wind shear. Numerous lines of storms brought severe winds
Source: NOAA National Weather Service Storm Events Database (event 988582). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Delaware County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.