Home Enhanced Fujita Scale

Enhanced Fujita Scale

PDFPrintE-mail

Dr. T. Theodore Fujita first introduced The Fujita Scale in the SMRP Research Paper, Number 91, published in February 1971 and titled, "Proposed Characterization of Tornadoes and Hurricanes by Area and Intensity". Fujita revealed in the abstract his dreams and intentions of the F-Scale. He wanted something that categorized each tornado by intensity and area. The scale was divided into six categories:

  • F0 (Gale)
  • F1 (Weak)
  • F2 (Strong)
  • F3 (Severe)
  • F4 (Devastating)
  • F5 (Incredible)

Dr. Fujita's goals in his research in developing the F-Scale was

  • categorize each tornado by its intensity and its area
  • estimate a wind speed associated with the damage caused by the tornado

Dr. Fujita and his staff showed the value of the scale's application by surveying every tornado from the Super Outbreak of April 3-4, 1974. The F-Scale then became the mainstay to define every tornado that has occurred in the United States. The F-Scale also became the heart of the tornado database that contains a record of every tornado in the United States since 1950.

 

efscale2

efscale1