Scientists see rise in tornado-creating conditions

According to some climate scientists, such earlier-than-normal outbreaks of tornadoes, which typically peak in the spring, will become the norm as the planet warms. "As spring moves up a week or two, tornado season will start in February instead of waiting for April," said climatologist Kevin Trenberth of the National Center for Atmospheric Research. Whether climate change will also affect the frequency or severity of tornadoes, however, remains very much an open question, and one that has received surprisingly little study. "There are only a handful...