I should note that the SPC has not assigned state tornado numbers this year (as of the time of writing.) Although a minor issue, this does affect how tornado index numbers* were chosen for tornadoes. In past years, the index number was generally a mix of the date, state FIPS code, and state tornado number (see “2006 Data Added to Tornado History Project Database”. However, since the state tornado number has not yet been assigned, the general SPC tornado number was used instead.
One more note on the archive files posted by the SPC this year…I noticed some significant revisions to the 2007 and 2006 data (mainly tornado number and latitude/longitude revisions), but those changes have not yet been incorporated here. So, be on the lookout for another update to address this in the near future, as well as several other general updates to the Tornado History Project.
* 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.