Why a tornado's destruction might not be as violent as it looks

History · Published 19 October 2026 · Updated 20 October 2026 Swipe more like this →

In short: A house leveled by a tornado does not always signify the highest wind speeds. The transition from the original Fujita scale to the Enhanced Fujita scale revealed that many previous ratings were too high. By accounting for construction quality and specific damage indicators, the new system provides a more precise estimate of intensity.

The shift to the Enhanced Fujita (EF) scale in 2007 was driven by a need for precision. While the original 1971 Fujita scale was a landmark, it was often criticized for being too subjective and for overestimating wind speeds. Engineering studies since the 1970s revealed that slower winds than initially thought were capable of causing massive structural failure. Meteorologists and engineers used a process called expert elicitation to determine these speeds. This method relied on field experience and various engineering studies. Unlike previous versions, the EF scale focuses exclusively on 3-second gusts. It also accounts for variables like different types of native vegetation.

To fix this, the Fujita Scale Enhancement Project at Texas Tech University spent four years (2000–2004) standardizing 28 different damage indicators and 8 degrees of damage. The project involved dozens of experts from both meteorology and civil engineering. This collaborative effort aimed to clarify what was previously ambiguous. The new system was publicly unveiled in October 2004 in Massachusetts. It officially began in the United States on February 1, 2007.

A key nuance of the EF scale is its focus on construction quality. On the old scale, a frame home completely swept away generally earned an F5 rating. Under the more rigorous EF scale, that same destruction is typically rated as a high-end EF4; only a house of above-standard construction would reach EF5 status. This distinction matters because it prevents the This shift resulted in a measurable decrease in the percentage of tornadoes receiving the highest ratings. However, this difference disappears if high-end EF4 tornadoes with peak winds of 190–200 mph are included as candidates. The National Weather Service notes that the upper bound for EF5 wind speeds remains open. For research, the scale is often grouped into weak, strong, and violent classes.

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