Fueled by abnormally warm Caribbean waters, Hurricane Melissa exploded into a Category 5 cyclone while moving at little more than a strolling pace -- a dangerous mix that could amplify its impacts through relentless rain, storm surge and wind.

Scientists say both rapid intensification and stalling storms are on the rise in a warming climate. Here's what to know.

- Supercharged by climate change -

Melissa jumped from a tropical storm with 70 mph (110 kph) winds on Saturday morning to a 140 mph Category 4 within 24 hours. It's since strengthened further into a Category 5, the highest level on the Saffir-Simpson, where even well-built structures face catastrophic damage.

It was the fourth of five Atlantic hurricanes this season to intensify in such dramatic fashion.

"We haven't had that

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