Answer
The original F-scale developed and introduced by Dr. T. Theodore Fujita was a damage scale for winds, including tornadoes, which was supposed to relate the degree of damage to the intensity of the wind. This scale was the result. The original F-scale should not be used anymore, because it has been replaced by an enhanced version. Tornado wind speeds are still largely unknown; and the wind speeds on the original F-scale have never been scientifically tested and proven. Different winds may be needed to cause the same damage depending on how well-built a structure is, wind direction, wind duration, battering by flying debris, and a bunch of other factors. Also, the process of rating the damage itself is largely a judgment call -- quite inconsistent and arbitrary (Doswell and Burgess, 1988). Even meteorologists and engineers highly experienced in damage survey techniques often came up with different F-scale ratings for the same damage. Even with all its flaws, the original F-scale was the only widely used tornado rating method for over three decades. The enhanced F-scale took effect 1 February 2007.
The Enhanced F-scale is a much more precise and robust way to assess tornado damage than the original. It classifies F0-F5 damage as calibrated by engineers and meteorologists across 28 different types of damage indicators (mainly various kinds of buildings, but also a few other structures as well as trees). The idea is that a "one size fits all" approach just doesn't work in rating tornado damage, and that a tornado scale needs to take into account the typical strengths and weaknesses of different types of construction. This is because the same wind does different things to different kinds of structures. In the Enhanced F-scale, there will be different, customized standards for assigning any given F rating to a well built, well anchored wood-frame house compared to a garage, school, skyscraper, unanchored house, barn, factory, utility pole or other type of structure. In a real-life tornado track, these ratings can be mapped together more smoothly to make a damage analysis. Of course, there still will be gaps and weaknesses on a track where there was little or nothing to damage, but such problems will be less common than under the original F-scale. As with the original F-scale, the enhanced version will rate the tornado as a whole based on most intense damage within the path. There are no plans to systematically re-evaluate historical tornadoes using the Enhanced F-scale. http://www.spc.noaa.gov/faq/tornado/index.html To See the Complete Scale and comparison see this link. http://www.spc.noaa.gov/faq/tornado/ef-scale.html To Learn More about Tornados see these links TORNADO INFORMATION
http://www.srh.noaa.gov/jetstream/tstorms/tornado.htm
http://www.spc.noaa.gov/faq/tornado/
http://www.nssl.noaa.gov/faq/faq_tor.php
http://www.srh.noaa.gov/srh/jetstream/tstorms/tstorms_intro.htm
http://www.srh.noaa.gov/srh/jetstream/tstorms/tornado.htm
http://www.spc.noaa.gov/faq/tornado/
http://www.nssl.noaa.gov/faq/faq_tor.php
http://www.usatoday.com/weather/tornado/wtfaq.htm
http://library.thinkquest.org/03oct/00758/en/disaster/tornado.html
http://www.hubbard.lib.oh.us/tornado/tornado_faqs.htm
http://www.tornadohistoryproject.com/
http://www.nssl.noaa.gov/hazard/
Tornado Climatology
http://www.nssl.noaa.gov/briefings/vol2_no3/new_findings.htmlTornados and El Nino / La Nina
http://www.spc.noaa.gov/publications/schaefer/el_nino.htm
The Fujita scale, used to measure the strength of tornadoes, was developed by Tetsuya Theodore Fujita (1920-1998).Dr. Theodore Fujita first introduced the Fujita Scale in 1971 and was the main inventor, but Allen Pearson, head of the National Severe Storms Forecast Center in Kansas City, Missouri, (now known as the Storm Prediction Center) helped make additions He helped include the path width and path length into the version of the Fujita Scale which was relased in 1973.
The Fujita scale, or Fujita intensity scale, is a scale used to rate tornado intensity based on the damage caused by a tornado. It ranges from F0 (weakest) to F5 (strongest) and is no longer in use, having been replaced by the Enhanced Fujita (EF) scale which takes additional factors into account.
The Fujita (F) scale was originally developed by Dr. Tetsuya Fujita at the University of Chicago. The current scale, the Enhanced Fujita (EF) scale was developed by a large group of engineers and scientists working at Texas Tech University.
EF stands for Enhanced Fujita scale, which is used to classify tornado intensity based on the damage caused. EF2 on the scale indicates a tornado with estimated wind speeds of 111-135 mph that can cause considerable damage.
EF on the tornado scale stands for Enhanced Fujita scale. It is used to classify tornado intensity based on the damage caused by the tornado, ranging from EF0 (weakest) to EF5 (strongest). The EF scale takes into account the strength of the wind and the type of damage observed.
Theodore Fujita develop the fujita scale in 1971
the fujita scale coverted into Enhanced fujita scale
The Fujita Scale was created in 1971 by Dr. Tetsuya "Ted" Fujita.
The Fujita scale is used to classify tornadoes.
The Fujita Scale rates tornadoes based on the damage they cause, ranging from F0 (light damage) to F5 (incredible damage). The Saffir-Simpson Hurricane Wind Scale, on the other hand, categorizes hurricanes from Category 1 (minimal damage) to Category 5 (catastrophic damage) based primarily on sustained wind speeds. Both scales are essential for assessing the potential impact of severe weather events, with Fujita focusing on tornadoes and Saffir-Simpson on hurricanes. Each scale helps inform emergency response and public safety measures.
The most common Fujita scale rating is F0 (EF0 on the Enhanced Fujita scale).
fujita scale now known as the enhanced fujita scale
the fujita scale now called the enhanced fujita scale
fujita scale now called enhanced fujita scale
the fujita scale now called enhanced fujita scale
The original scale for rating tornadoes is officially the Fujita-Pearson scale, though the Pearson numbers were rarely used. The scale is normally referred to simply as the Fujita scale. In 2007 the United States stopped using this scale in favor of the Enhanced Fujita scale.
Development of the Fujita Scale began in 1970 and the scale was published in 1971. It was used in the United States until 2007, when it was replaced with the Enhanced Fujita Scale.