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.

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 Enhanced Fujita Scale, which replaced the earlier Fujita Scale in February 2007, categorizes tornadoes by degree of damage indicators and associates that damage with estimated wind speeds for ...

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 Enhanced Fujita Scale became operational on February 1, 2007. It was designed to rate tornadoes based on estimated wind speeds and related damage. The strength of a tornado has nothing to do ...

What is the EF scale? Since Feb. 1, 2007, the National Weather Service has used the Enhanced Fujita (EF) scale, an improved version of the scale designed by Dr. Tetsuya Theodore Fujita in 1971 to ...

The Enhanced Fujita scale is already a 2007 revised version of the original Fujita Scale created in the 1970s, so should government weather authorities at the National Oceanic and Atmospheric ...

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, ...

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 ...