What is the risk of another super-outbreak like April 3–4, 1974?
It is rare; but we do not know how rare, because an out-break like that has only happened once since tornado records have been kept. There is no way to know if the odds are one in every 50 years, 100 years, or 1,000 years, since we just do not have the long climatology of reasonably accurate tornado numbers to use. So the bigger the outbreaks, the less reliably we can judge their potential to recur.
