Tornadoes (NWS Quad Cities, IA/IL) Tornadoes in a Deceptively Small CAPE Environment: The 4/20/04 Outbreak in Illinois and Indiana (Albert E. Pietrycha, Jonathan M. Davies, Mark Ratzer, and Paul Merzlock) Storm Survey Results for the April 20, 2004 Clinton County Tornadoes (NWS Quad Cities, IA/IL) Storm Survey Results for the April 20, 2004 Putnam & Bureau County Tornadoes (NWS Quad Cities, IA/IL) Federal Disaster Declaration (Federal Emergency Management Agency) F3 tornadoes Tornadoes of 2004 Tornadoes in Illinois LaSalle County, Illinois 2004 natural disasters in the United States April 2004 events in the United States