Deadly Spring 2011 Tornadoes By jeanattig Period: Apr 15, 2011 to Jun 15, 2011 Spring 2011 Three of the seven deadliest tornadoes in the last 64 years occurred during the Spring of 2011. Apr 27, 2011 Hackleburg, AL Apr 28, 2011 Tuscaloosa-Birmingham, AL May 22, 2011 Joplin, MO Jun 1, 2011 Springfield, MA