CBS: Climate change may be playing a role in the strength and frequency of tornadoes, a new study suggests.
Research published in the journal Climate Dynamics finds that although tornadoes are occurring fewer days per year than they used to, they are forming at greater density and strength. This means that on days when tornadoes do form, there tend to be more of them and they're often more powerful.
The United States experiences more tornadoes than any other country in the world. They can happen...