Topeka, Kansas, United States is devastated by a tornado that registers as an "F5" on the Fujita scale, exceeding US$200 million in damages. Seventeen people are killed, over five hundred more injured, and thousands of homes damaged or destroyed.

Topeka is the capital city of the U.S. state of Kansas and the county seat of Shawnee County. It is along the Kansas River in the central part of Shawnee County, in northeastern Kansas, in the Central United States. As of the 2020 census, the population of the city was 126,587.

The tornado outbreak sequence of June 1966 was a series of large and devastating tornado outbreaks which occurred between June 2 and June 12, 1966. The nearly two week event of severe weather was mainly concentrated in the Midwestern region of the United States, but was widely spread out to areas as far south as Texas and Florida, and as far east as New York.

The Fujita scale, or Fujita–Pearson scale, is a scale for rating tornado intensity, based primarily on the damage tornadoes inflict on human-built structures and vegetation. The official Fujita scale category is determined by meteorologists and engineers after a ground or aerial damage survey, or both; and depending on the circumstances, ground-swirl patterns, weather radar data, witness testimonies, media reports and damage imagery, as well as photogrammetry or videogrammetry if motion picture recording is available. The Fujita scale, named for the meteorologist Ted Fujita, was replaced with the Enhanced Fujita scale (EF-Scale) in the United States in February 2007. In April 2013, Canada adopted the EF-Scale over the Fujita scale along with 31 "Specific Damage Indicators" used by Environment Canada (EC) in their ratings.

June 8 is the 159th day of the year in the Gregorian calendar; 206 days remain until the end of the year.