A severe thunderstorm wall cloud is seen over area of Canton, Mississippi
A severe thunderstorm wall cloud is seen over the area of Canton, Mississippi April 29, 2014. At least 34 people were killed in tornadoes unleashed by a ferocious storm system that razed neighborhoods in the southern United States over the last three days and threatened more destruction in heavily populated parts of the South on Tuesday.
REUTERS/Gene Blevins (UNITED STATES - Tags: DISASTER ENVIRONMENT)