National Severe Storms Laboratory-Based in Norman, Oklahoma, this internationally known environmental research laboratory specializes in the study of all aspects for severe weather (tornadoes, thunderstorms, lightning, hail, floods, and damaging winds). "NSSL Briefings" is available full-text through this page
For access to datasets in the field of meteorology, users should consult the National Centers for Environmental Information
Another useful means of locating existing datasets is the WORLDCAT database, which sorts search results by category- datasets that have been catalogued will appear under the heading " Computer ."
For the state of Illinois, an historic body of climatic data from 117 local stations can be found at the Illinois State Water Survey