Under the Enhanced Fujita scale, there are seven categories of storm. The lowest category is EFU, which is used for storms that don't have enough data or cause enough damage to be classified.

Fujita Scale: This scale rates tornadoes based on the damage they cause to structures like buildings, trees, and other objects. However, it used general damage indicators, ...

Compared to the Fujita scale, the EF scale tightened the wind speed criteria for each rating. On the Fujita scale, for a tornado to be classified as an F-5, its peak wind speeds must exceed 261 mph.

The strength of tornadoes is rated on the Enhanced Fujita, or EF, Scale. Storm chasing photographers take photos underneath a rotating supercell storm system in Maxwell, Nebraska on September 3, 2016.

Since its inception in 2007, the Enhanced Fujita Scale no longer depends solely on wind speeds to determine the strength of a tornado. The last recorded EF-5 tornado was observed in Moore ...

The Enhanced Fujita Scale, love it or hate it, is our current system for rating the hundreds of tornadoes that occur each year across the United States. To much chagrin, it rates tornadoes solely ...

The strength of tornadoes is rated on the Enhanced Fujita, or EF, Scale. Storm chasing photographers take photos underneath a rotating supercell storm system in Maxwell, Nebraska on September 3, 2016.

The EF scale, better known as the Enhanced Fujita Scale, was adopted by the National Weather Service (NWS) in 2007. This scale is a revised version of what was known as the Fujita Scale, or F-Scale.

Since its inception in 2007, the Enhanced Fujita Scale no longer depends solely on wind speeds to determine the strength of a tornado. The last recorded EF-5 tornado was observed in Moore, Oklahoma, ...