25 nov 1926 anni - The deadliest Novembertornadooutbreak in U.S. history strikes onThanksgiving day. Twenty-seven twisters of great strength are reported in theMidwest, including the strongest November tornado, an estimated F4, that devastatesHeber Springs, Arkansas. There are 51 deaths inArkansasalone, 76 deaths and over 400 injuries in all.