Do we need a category six in defining storms? Some climate scientists think so, as tropical cyclones increase in duration, intensity, and strength, The Guardian reported. Climatologist Michael Mann said, “Scientifically, [six] would be a better description of the strength of 200 miles per hour storms, and it would also better communicate the well-established finding now that climate change is making the strongest storms even stronger.” The Saffir-Simpson Hurricane Wind Scale currently runs from one to five, based on sustained wind speed, according to the National Hurricane Center.