EFscale
The Enhanced Fujita scale, or EF-scale, is a system used to rate the intensity of tornadoes based on the damage they cause. It is applied in post-storm surveys in the United States and Canada and provides estimated wind speeds tied to observed destruction rather than direct measurements. The EF-scale was introduced in 2007 as an update to the original Fujita scale, with the goal of improving consistency across different building types and construction practices.
Historically, the original Fujita scale was developed by Ted Fujita in 1971 and rated tornadoes from F0
The EF-scale comprises 28 Damage Indicators covering various structure types and objects, each evaluated for degrees
Limitations include the reliance on observed damage rather than direct wind measurements, which means wind speeds