The Enhanced Fujita Scale (EF Scale)

Largely based on it's predecessor (the Fujita Scale), the Enhanced Fujita Scale became the official scale for ranking tornadoes in February 2007.

As many of you already know, the strength of a tornado isn't actually measured until after the storm has hit! Tornado strength is measured based on the damage it leaves behind, and there
has been many updates made to the original scale.

While the principle scale remains the same, a lot of revisions and enhancements were made to account for variables such as vegetation and building structure.

NEW EF Scale Old
F Scale
  Winds Damage Winds
EF 0 65-85 mph Light F0 < 73
EF 1 86-110 mph Moderate F1 73-112
EF 2 111-135 mph Considerable F2 113-157
EF 3 136-165 mph Severe F3 158-206
EF 4 166-200 mph Devastating F4 207-260
EF 5 > 200 mph Incredible F5 261-318

Read the full report.

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