What are the sources for tornado risk?
Tornado records have been collected and published by the USGS since 1950. Unlike hurricanes, which are always presented as a hurricane path, tornadoes are presented either as a path or as a single touchdown point. Nearly 40,000 individual tornado events have been recorded and were used in the risk analysis. Each tornado point and path was assigned an area of decreasing influence which was then applied in aggregate to each community location.
