"Hypercane!" Is a Mega-Katrina Possible?

"Hypercane!" Is a Mega-Katrina Possible?: "MIT's Kerry Emanuel describes the worst nightmare hurricane that could ever happen -a 'hypercane' with winds raging around its center at 500 miles an hour. Water vapor; sea spray and storm debris are spewed into the atmosphere, punching a hole in the stratosphere 20 miles above the Earth's surface; at landfall, its super-gale-force winds would flatten forests and toss boulders with a 60-foot tsunami-like storm surge flooding nearby shores. The water vapor and debris could remain suspended high in the atmosphere for years, disrupting the climate and the ozone layer."