Data updates

As you may know, the Tornado History Project uses data from the Storm Prediction Center’s (SPC) historical archive to generate maps and tables. So when the SPC updates their archive with new stats and information, the Tornado History Project incorporates those changes into our database. A quick summary of the recent changes follows:

*Index numbers are generated by the Tornado History Project to uniquely identify tornadoes within the site. The index number is not part of the official SPC data.