April 20, 1920 – A tornado outbreak in Mississippi and Alabama killed 219. Aberdeen MS hard hit by F4 tornado that killed 22 people along the western edge of the town. This same tornado killed 20 in Marion County Alabama, including 9 at Bexar. 19 people died in Franklin County, Alabama (nine in one family). The tornadoes were unusual as they struck during the morning hours.
April 20, 2004 – A warm front moved across central Indiana during the afternoon and early evening of April 20, 2004. Supercell thunderstorms developed near the front, bringing 6 tornadoes to central Indiana, with touch downs in Kokomo, Elwood, and Jamestown. Click here for the NWS Indianapolis summary of the event, with pictures and a full size version of the attached map.