Led by scientists at Purdue University, the researchers used several climate models to predict the effects of rising air temperatures on the nation's weather.

The models predict the increased likelihood of severe storms is greatest for areas near the Gulf of Mexico and the Atlantic Ocean. While some areas were only slightly affected by the forecasts, researchers found the number of days that favor severe storms could more than double by the end of this century in Atlanta, New York and other areas.

The climate models also predict conditions favoring severe storms will occur during typical storm seasons in those locations, but not during dry seasons when such storms might be more beneficial.

Researchers said their findings should increase awareness of climate change, as well as promote efforts to develop emergency plans in vulnerable areas.

Study results are detailed in the early online edition of the Proceedings of the National Academy of Sciences.