Sailing Glossary - Term Fujita tornado scale

Based upon damage patterns, classifies twisters into six categories of wind speed (F0 thru F5), ranging from 40 to 318 mph estimated wind speed, plus a hypothetical F6 with winds from 318 mph to Mach 1. Developed in 1971 by T. Theodore Fujita of the University of Chicago. Also known as the Fujita-Pearson Scale.