The Enhanced Fujita Scale, or EF Scale, is the scale for rating the strength of
tornadoes in the
United States estimated via the damage they cause. Implemented in place of the
Fujita scale introduced in 1971, it began operational use on
February 1,
2007. The scale has the same basic design as the original Fujita scale, six categories from zero to five representing increasing degrees of damage. It was revised to reflect better examinations of tornado damage surveys, so as to align wind speeds more closely with associated storm damage. Better standardizing and elucidating what was previously subjective and ambiguous, it also adds more types of structures as well as vegetation, expands degrees of damage, and better accounts for variables such as differences in construction quality.
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A drug that is used to plan cancer treatment by measuring oxygen levels in tumor cells.
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