If you are looking for information on the Tornado oubreak of 1996 where one of many tonadoes went through part of the town of Decatur, Here are some links:
1. Severe weather reports - April 19
Including a plotted map of all the tornadoes that hit that day in 1996 in Illinoise.
http://redrock.ncsa.uiuc.edu/People/bjewett/Apr19/Obs/Reports/index.html
Scroll down and you will find the following report.
"The Decatur Tornadic Storm...A tornado moved through the northwest and northern sections of Decatur. National Weather Service estimates indicated that most of the storm damage was of F-2 intensity on the Fujita Scale, with some isolated F-3 damage found. The F-3 areas were in northwestern Decatur near the corner of Wycles and Center Roads, and also at the west end of Ravina Park Road... "
CNN Archived News Report on the outbreaik:
http://www.cnn.com/US/9604/20/midwest.storms/index.html
Radar loop from a study
http://redrock.ncsa.uiuc.edu/People/bjewett/Apr19/Obs/Composite/index.html
Individual radar imagery:
http://redrock.ncsa.uiuc.edu/People/bjewett/Apr19/Obs/nexrad.html
Satellite loop index from that day
http://redrock.ncsa.uiuc.edu/People/bjewett/Apr19/Obs/satellite.html
MM5 model simulation of the severe storm development.
http://redrock.ncsa.uiuc.edu/People/bjewett/Apr19/MM5/sims/r405/r405a.1km.mov
Review of NWS Damage Survey as reported by USA Today
http://www.usatoday.com/weather/wt419ill.htm
Plotted storm tracks
http://redrock.ncsa.uiuc.edu/AOS/People/jewett/Apr19/WRF/trackscolor.gif
Case study of the entire event:
http://ww2010.atmos.uiuc.edu/(Gh)/arch/cases/960419/home.rxml
Research study on event:
http://redrock.ncsa.uiuc.edu/AOS/publications/SLS98/apr19.html
ILLINIWEATHER.COM
List of local news archive with a couple of links to this event.
http://nl.newsbank.com/nl-search/we/Archives?p_product=DH&p_theme=dh&p_action=search&p_maxdocs=200&s_dispstring=1996%20tornado&p_field_advanced-0=&p_text_advanced-0=("1996%20tornado")&p_perpage=10&p_sort=YMD_date:D&xcal_useweights=no
Hope this is what you needed.