Without a thorough engineering analysis of tornado damage in any event, the actual wind speeds needed to cause that damage are unknown. The Enhanced F-scale was implemented in February 2007.

An F1 tornado has a rating classification of Weak. The F1 rating was replaced by EF1 under the new Enhanced Fujita Scale . From 1970 to 2002, F1 tornados account for 36% of all tornados occurence in the United States.

F1: Moderate tornado: 73-112 mph: The lower limit is the beginning of hurricane wind speed; peels surface off roofs; mobile homes pushed off foundations or overturned; moving autos pushed off the roads; attached garages may be destroyed. F2: Significant tornado: 113-157 mph: Considerable damage.

The Fujita scale (F-Scale; / fuˈdʒiːtə /), or Fujita–Pearson scale (FPP scale), is a scale for rating tornado intensity, based primarily on the damage tornadoes inflict on human-built structures and vegetation.

Below is a brief description of each type of tornado on the Fujita scale. F0 Tornado. Broken branches; shallow rooted trees pushed over; some chimney damage. F1 Tornado. Surface damage to roofs; mobile homes pushed off foundation; moving …

F1 - Moderate Tornado (73 - 112 mph) P1 PATH length: 1.0-3.1 miles / P1 PATH width: 18-55 yards Moderate damage; The lower limit is the beginning of hurricane wind speed; peels surface off roofs; mobile homes pushed off foundations or overturned; moving autos pushed off the road; attached garages may be destroyed.

F1 Moderate Tornado Winds 73 to 112 mph, producing moderate damage. Peels surface off roofs; mobile homes pushed off foundations or overturned; moving autos blown off roads. Account for 22% of South Florida tornadoes and 20% of tornado casualties (injuries and/or fatalities).

Enhanced F Scale for Tornado Damage. An update to the the original F-scale by a team of meteorologists and wind engineers, implemented in the U.S. on 1 February 2007.

The Fujita Tornado Scale, usually referred to as the F-Scale, classifies tornadoes based on the resulting damage. This scale was developed by Dr. T. Theodore Fujita (University of Chicago) in 1971. MINIMAL DAMAGE: Some damage to chimneys, TV …

The Seymour, Texas, tornado of April 10, 1979 is a prime example of a tornado that is destined to be misjudged on the Fujita Scale. This spectacular funnel was probably capable of F4 damage, had it passed through a town.