EF-0, EF-1, EF-2, EF-3, EF-4, EF-5 Tornadoes, and what they mean

Can you interpret the tornado scale numbers? Many estimate or just guess—now, discover important meanings:

First, can you answer some tornado topics?

  • What does "F" in a tornado F-Scale stand for? ...and the EF?
  • What do the scale numbers represent?
  • How can you best protect human life in an EF tornado with any associated number?

Tornado answers revealed

Where the "F-Scale" originated; scale numbers

When you hear of EF-4 or EF-5 tornadoes, you likely know that they're very serious events. But what exactly does that all mean? The "F" in an F scale originated in 1971 when Japanese-born United States Citizen and meteorologist through the University of Chicago Dr. Tetsuya Theodore "Ted" Fujita first introduced his Fujita Scale.

The Fujita Scale characterized and rated tornadoes and hurricanes by area and intensity with a six-point scale. Each level defined the intensity, area, and wind speed estimate associated with a tornado's damaging winds. Following the April, 1974 Super Tornado Outbreak in the U.S., Dr. Fujita's F-Scale became a standard of measurement:

  •    • F0–Gale
  •    • F1–Weak
  •    • F2–Strong
  •    • F3–Severe
  •    • F4–Devastating
  •    • F5–Incredible

Not your typical family—with high winds, damaging debris

Dr. Fujitsa also introduced the concept of tornado families, a sequence of tornadoes, each with their own path but originating from one thunderstorm. Measuring the effects of various tornadoes is complicated, involving many factors that include the variety of home structures and their construction, subjective assessments, varying wind speeds, and perceived tornado damage. 

A committee that originated with fine-tuning measurement issues following the 1997 Moore, OK tornado met to develop the Enhanced (the "E" in "EF") Fujita Scale that conformed to both the original F-Scale while also including other factors such as consistency in damage assessment and data collection, and the then new 28 Damage Indicators.

Compare the original F-Scale to the EF-Scale 

The EF-Scale (Enhanced F-Scale) remains a set of wind estimates (with a slightly different range than in the initial F-Scale), not measurements, that are based upon actual damage. Consider:

Tornado damage to property is devastating; loss of life is indescribable. Great solution here.

The Texas Tech University National Wind Institute has been instrumental in providing NOAA (National Oceanic and Atmospheric Association) with critical severe weather, tornado data. When we speak of American Tornado Master products being tested at Texas Tech, you'll know that we at American Tornado Master have done our due diligence in working to provide safe, tested severe weather shelters. 

American Tornado Master cannot stop tornadoes. But we can help to stop tornadoes from harming you and your family. Too much destruction—too much loss of life. Discover how to protect yourself and your family when you contact American Tornado Master for information about tested severe weather shelters.