May 22, 2004
The second of two squall lines that developed in western Iowa the night of 21 May 2004 moved across Eastern Iowa and Northwest Illinois during the morning hours. The squall line had weakened considerably during the night so severe weather was sporatic but produced heavy rain over areas that were already saturated and thus renewed flash flooding. The most impressive feature of the squall line as it approached was a very prominent shelf cloud that could be observed from horizon to horizon.
Source: NOAA National Weather Service Storm Events Database (event 5416386). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Buchanan County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.