Spring is when the U.S. generally has the worst tornadoes.
1925. There were 794 tornado deaths in the U.S. that year, 695 from a single tornado.
The worst (or at least the deadliest) tornado to hit the U.S. was the Camilla, Georgia tornado of February 13, which killed 11 people.
The Woodward, Oklahoma tornado of April 9, 1947 with 181 deaths.
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The worst tornado damage of 2010 appears to have been in Mississippi, particularly from long-track EF4 tornado that move across the state on April 22.
Late May is tornado season in the United States, but your chances of encountering a tornado are still very slim.
The worst tornado in U.S. history was the Tri-State tornado of March 18, 1925. This F5 tornado carved a 219 mile damage path across parts of Missouri, Illinois, and Indiana, killing 695 and injuring over 2,000.
The longest-lived and farthest traveling tornado was the world in the US, but not in the world. It was the Tri-State tornado of March 18, 1925, which hit portions of Missouri, Illinois, and Indiana. The worst tornado on record in the world was the Daulatpur-Saturia tornado, which struck central Bangladesh on April 26, 1989.
The worst tornado in U.S. history was the Tri-State tornado of March 18, 1925. The tornado first formed north of Ellington, Missouri. The tornado devastated numerous towns in Missouri, Illinois, and Indiana along a path 219 miles long.
The Tri-State tornado of March 18, 1925. This tornado tore through parts of Missouri, Illinois, and Indiana, killing 695 people.
The worst tornado was the Daulatpur-Salturia tornado in Bangladesh, it killed more than 1300 people but its intensity is unknown.
There are not publicly available tornado season forecasts. However, seeing as it is now late June, Kansas is probably past the worst of its tornado activity for 2013.