The Fujita Scale was replaced by the Enhanced Fujita Scale in 2007, but I think 'EF-5' sounds stupid, so I vote we just use the new measurements for assigning numbers but still call them 'F-whatever'.
Special 10th anniversary edition of WHAT IF?—revised and annotated with brand-new illustrations and answers to important questions you never thought to ask—coming from November 2024. Preorder here!