The worst tornado was the Daulatpur-Salturia tornado in Bangladesh, it killed more than 1300 people but its intensity is unknown.
In a violent tornado the worst features are flying debris and suction vortices, small whirlwinds that have stronger winds than the rest of the tornado.
The worst level of tornado that can strike is an EF5.
Probably the worst, or at least the deadliest tornado in the world was the Daulatpur-Salturia in Bangladesh on April 26, 1989.
The worst tornado to hit Cowley County Kansas was the Udall, Kansas F5 tornado of May 25, 1955. This tornado killed 80 people, making it the deadliest tornado in Kansas history.
The worst tornado was the Daulatpur-Salturia tornado in Bangladesh, it killed more than 1300 people but its intensity is unknown.
Spring is when the U.S. generally has the worst tornadoes.
The worst tornado of 2012 would probably be the EF4 tornado that hit the towns of Henryville, New Pekin, and Marysville in Indiana on March 2, killing 11 people.
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The worst tornado in the US in 2000 was the "Fort Worth Tornado" that struck Fort Worth, Texas on March 28, 2000, causing significant damage and a few fatalities.
The worst tornado of 2005 was an F3 that killed 25 people in the town of Evansville, Indiana.
The worst level a tornado can attain is F5 on the old Fujita scale or EF5 on the newer Enhanced Fujita scale.