The Enhanced Fujita Scale or EF Scale, which became operational on February 1, 2007, is used to assign a tornado a 'rating' based on estimated wind speeds and related damage.

The EF Scale takes into account more variables than the original F Scale did when assigning a wind speed rating to a tornado. The EF Scale incorporates 28 damage indicators (DIs) such as building type, structures, and trees.

The EF Scale was revised from the original Fujita Scale to reflect better examinations of tornado damage surveys so as to align wind speeds more closely with associated storm damage. The new scale has to do with how most structures are designed.

An Enhanced Fujita (EF) Scale, developed by a forum of nationally renowned meteorologists and wind engineers, makes improvements to the original F scale. This EF Scale has replaced the original F scale, which has been used to assign tornado ratings since 1971.

2025年1月10日 · Moderate tornado 73-112 mph The lower limit is the beginning of hurricane wind speed; peels surface off roofs; mobile homes pushed off foundations or overturned; moving autos pushed off the roads; attached garages may be destroyed.

Since 2007 in the U.S., the new Enhanced F-scale has become the standard for assessing tornado strength and resultant damage. In the original F-scale, wind speeds were based on calculations of the Beaufort wind scale and had never been scientifically verified in real tornadoes.

2024年4月26日 · A tornado outbreak occurred across Nebraska and Iowa during the afternoon and evening hours of Friday, April 26, 2024. Several significant, long-tracked tornadoes damaged or destroyed hundreds, if not thousands, of homes and businesses across the region. People across the region were deeply impacted, several were injured, and there was one ...

2021年1月26日 · Assigning a Tornado Rating Using the EF Scale. The NWS is the only federal agency with authority to provide 'official' tornado EF Scale ratings. The goal is assign an EF Scale category based on the highest wind speed that occurred within the damage path.

The Fujita Tornado Scale, usually referred to as the F-Scale, classifies tornadoes based on the resulting damage. This scale was developed by Dr. T. Theodore Fujita (University of Chicago) in 1971.

Ratings on the scale ranged from F0 for the weakest tornadoes (light damage) to F5 for the most violent (incredible damage), with estimated wind speeds for each rating. However, for affected structures, little consideration was given to the quality of construction.