Portal:Tornadoes/Anniversaries/May 11

May 11
 * 1953 – An F5 tornado, obscured by heavy rain, leveled a potion of Waco, Texas and killed 114 people, including 30 in a six-story building that collapsed in downtown Waco. This was one of the first tornadoes to be matched with a hook echo by weather radar, but no warning was communicated to residents.
 * 1970 – An F5 tornado killed 26 people and destroyed more than 1,000 homes and apartment units in Lubbock, Texas. Ted Fujita led a detailed study of the damage from this tornado, using it to develop the levels of the Fujita scale and improve the understanding of multiple vortex tornadoes.