Note that the wind speeds provided are estimates and not to be taken at face value.
F0: (gale tornado), 40-72 mph. Some roof tiles and siding stripped, tree limbs broken, signs damaged. Weak sheds and outbuildings may be destroyed.
F1: (moderate tornado), 73-112 mph. Roofs of houses severely damaged. Poorly secured roofs may be removed. Trailer homes overturned.
F2: (significant tornado), 113-157 mph. Roofs torn from well-built houses. Trailer homes completely destroyed. Large trees snapped.
F3: (severe tornado), 158-206 mph. Roofs and walls torn from well-built houses, weaker houses may be completely leveled, most trees in a forest uprooted.
F4: (devastating tornado), 207-261 mph. Well-built houses leveled and left as pile of debris. Poorly anchored houses blown off foundations. Trees debarked.
F5: (incredible tornado), 261-318 mph. Well-built houses completely swept away, leaving bare foundations. Reinforced concrete structures destroyed.
It isn't. The Fujita scale is the traditional tornado rating system, and it was the first to be developed.
The Greensburg tornado was an EF5 on the Enhanced Fujita Scale, which is equivalent to an F5 on the original Fujita Scale.
The Fujita and Enhanced Fujita scales assesses damage caused by a tornado to assign a rating.
Tornadoes are classified based on the Enhanced Fujita (EF) scale, with ratings ranging from EF0 to EF5. The tornado of the elevens was likely classified based on the damage it caused, such as structural damage to buildings, uprooted trees, and the extent of the destruction it left behind.
Enhanced Fujita
The Fujita scale uses the severity of the damage a tornado causes to determine its rating.
The highest Fujita rating for a tornado is F5, which represents winds of 261-318 mph (419-512 km/h). F5 tornadoes are considered to be the most powerful and destructive, capable of causing catastrophic damage.
The most common Fujita scale rating is F0 (EF0 on the Enhanced Fujita scale).
Tornadoes are rated on the Enhanced Fujita scale, which replaced the Fujita scale in 2007.
The correct spelling of the term is "Fujita scale" (tornado rating scale named for scientist Tetsuya Fujita).
The highest rating for a tornado is EF5 on the Enhanced Fujita scale or F5 in the original Fujita Scale. Winds in these tornadoes can exceed 300 mph.
The F-scale or Fujita scale was developed by Dr. Tetsuya Theodore Fujita as the University of Chicago in 1971. The highest rating on the scale is F5.