Climate change may be the cause for not-so-frequent but stronger tornadoes hitting the United States, a researcher claims.

James Elsner, a Geography Professor from Florida State University, said that although tornadoes get fewer every year, they form in greater density and in greater strength than in previous years.

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He said the public might be less threatened by tornadoes everyday but when tornadoes come, they come like there is no tomorrow.

He said that deeper look at data showed more severity in the types of storms. Also, more tornadoes are occurring in a day than in past years.

Elsner believes it's important for the public to know of the higher risks of storms and the threat of multiple storms in a day.

Compared to other countries, the U.S. experiences more tornadoes than other countries despite warning systems in storm prone areas.

The National Weather Service Storm Prediction Center said there have been 189 storms in the U.S. this year. These storms have killed 43 people.

Elsner said the geographic impacts of the tornadoes appears to be increasing,

Tornadoes are violent rotating column of air in contact with both earth's surface and cumulonimbus clouds.

Other terms for tornadoes are twister and cyclones. Tornadoes come in many shapes and sized but they are typically formed in a visible funnel.

The funnel is made of condensed air which has narrow end that touches the earth and circles in a cloud of debris and dusts.