Picture of the "double tornado" that hit the Midway Trailer Park in Indiana, killing 14.

The second Palm Sunday tornado outbreak occurred on April 11–12, 1965, in the Midwest U.S. states of Indiana, Ohio, Michigan, Wisconsin, Illinois and Iowa, with 47 tornadoes (15 significant, 17 violent, 21 killers). It was the second-biggest outbreak on record at the time. In the Midwest, 271 people were killed and 1,500 injured (1,200 in Indiana). It was the deadliest tornado outbreak in Indiana history, with 137 people killed. The outbreak also made that week in April 1965 the second-most-active week in history, with 51 significant and 21 violent tornadoes. Despite having 17 F4 tornadoes, 6 of them (4 in Indiana, and 2 in Ohio) are questionable, and may have been F5's.

• http://en.wikipedia.org/wiki/1965 Palm Sunday tornado outbreak