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The Enhanced Fujita scale replaced the decommissioned Fujita scale that was introduced in 1971 by Ted Fujita. [6] Operational use began in the United States on February 1, 2007, followed by Canada on April 1, 2013, who uses a modified version known as the CEF-scale.
The Fujita scale was adopted in most areas outside of the United Kingdom. [citation needed] On February 1, 2007, the Fujita scale was decommissioned, and the Enhanced Fujita Scale was introduced in the United States. [7] The new scale more accurately matches wind speeds to the severity of damage caused by the tornado. [8]
The drought has led to questioning whether the Enhanced Fujita scale is an effective way to rate tornadoes, [6] and a 2025 study found that the drought has had a 0.3% chance of running for as long as it has. [6] As of February 2025, the drought of officially-rated EF5 tornadoes is ongoing, spanning over 4,000 days. [2]
Here's how tornadoes are rated on the Enhanced Fujita scale and what those ratings mean. What is the Enhanced Fujita scale? What to know about EF tornado categories
The Enhanced Fujita scale measures a tornado's intensity on a scale of 1 to 5 based on its wind speed estimates and resulting damages.
The strength of tornadoes is rated on the Enhanced Fujita, or EF, Scale.
These scales – the Fujita scale, the Enhanced Fujita scale, the International Fujita scale, and the TORRO tornado intensity scale – attempt to estimate the intensity of a tornado by classifying the damage caused to natural features and man-made structures in the tornado's path. [note 1] [note 2]
The Enhanced Fujita scale is used predominantly in North America. Most of Europe, on the other hand, uses the TORRO tornado intensity scale (or T-Scale), which ranks tornado intensity between T0 and T11; F4/EF4 tornadoes are approximately equivalent to T8 to T9 on the T-Scale. Tornadoes rated IF4 on the International Fujita scale are also ...