climatology

Severe Tornado Outbreaks defined as outbreaks with: ≥ 2 long-tracking tornado families each family w/ ≥ 2 (E)F3+ tornadoes each of these w/ path lengths ≥ 25 mi these families over wide geographic area Examples: 19–20 February 1884 28 March 1890 29–30 April 1909 28 March 1920 9 May 1927 21–22...