May 22, 2004
A low level jet developed the first of two squall lines in western iowa that raced east across Iowa and Illinois. The first squall line travelled north of the stationary front across Iowa and Northern Illinois. The storms brought renewed heavy rain to areas that had been saturated by storms just hours earlier.
Source: NOAA National Weather Service Storm Events Database (event 5416459). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Dubuque County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.