Tornadoes can occur whenever and wherever conditions are right. The strongest, longest-lived tornadoes (long-track EF5) are the least common, but produce the most devastating damage. Yet there's a lack of published research on these tornadoes embedded within parent storms.
Read about a first-of-its-kind simulation — made possible by Blue Waters at the National Center for Supercomputing Applications (NCSA) at the University of Illinois, US — detailing the genesis, maintenance, and decay of a long-track EF5 tornado.