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This is a list of tornadoes which have been officially labeled as F4, EF4, IF4, or an equivalent rating during the 2000s decade. 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 ...
EF4 damage was inflicted on a well-built two-story home that was leveled with only a pile of debris remaining, with some of the debris scattered into the yard. The wind speed estimate in this area was 175 mph (282 km/h). EF2-EF3 damage occurred in many other areas along the path as well. [13] [14] [8] April 19: 2020: United States Mississippi
Ultimately, a new scale was devised that took into account 28 different damage indicators; this became known as the Enhanced Fujita scale. [4] With building design and structural integrity taken more into account, winds in an EF4 tornado were estimated to between 166 mph (267 km/h) and 200 mph (320 km/h). [5]
The final rating of this tornado was a source of controversy, as some survey teams concluded EF5 damage, while others did not. [9] The structures that were swept away by this tornado were either improperly anchored, lacked interior walls, or were surrounded by contextual damage not consistent with winds exceeding 200 mph (320 km/h), and as a ...
Although the wind speeds and photographic damage examples are updated, which are more or less still accurate. [citation needed] However, for the actual TORRO scale in practice, damage indicators (the type of structure which has been damaged) are predominantly used in determining the tornado intensity.
Intensity cannot be determined due to a lack of information. This rating applies to tornadoes that traverse areas with no damage indicators, cause damage in an area that cannot be accessed by a survey, or cause damage that cannot be differentiated from that of another tornado. [4] N/A EF0: 65–85: 105–137 52.82% Minor damage.
The meteorologists and engineers who designed the EF Scale believe it improves on the F-scale on many counts. It accounts for different degrees of damage that occur with different types of structures, both manmade and natural. The expanded and refined damage indicators and degrees of damage standardize what was somewhat ambiguous.
A unique feature of the International Fujita scale compared to the Fujita or Enhanced Fujita scale is a new damage indicator based on measured wind speeds. For the IF scale , only wind speeds measured at or below 10 metres (11 yd) can be used to determine a rating.