Forecasters say hurricane to form off Mexico's Pacific coast

Forecasters say hurricane to form off Mexico's Pacific coast

According to NOAA, inland flooding accounts for more than 50% of hurricane-related deaths each year.

"Storms should be responding to changes in the whole global wind pattern, since they are mostly just carried along in the flow", Kossin said.

Slower-moving storms mean greater rainfall totals, as seen with Hurricane Harvey in Texas previous year.

In the western north Pacific, the slowdown's been 30 percent; in the "Australian" region it's 19 percent.

Study author James Kossin of the National Oceanic and Atmospheric Administration says Harvey is a great example of what he found.

The research, published today in the journal Nature, measured cyclones from 1949 to 2016 and found that the speed at which they move has slowed by 10 percent.

But there are probably more variables at play than a warmer climate putting the brakes on tropical cyclones.

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"I went in with that hypothesis and looked at the data, and out popped the signal that was much bigger than anything I was expecting", Kossin said.

"Nothing good can come of a slower storm", Kossin told Mashable.

Previous research has shown that a warmer climate can hold more water moisture, so when it rains, it rains more.

Unhurried hurricanes also mean strong winds blowing more often over the same place and possibly more storm surge, Kossin said.

"Roughly 7 percent more water vapor per degree C of warming", Kossin said.

First, he noted that over the more than 60-year period of the study, there may be natural, decades-long cycles in the climate system that could affect the steering of storms and have little or nothing to do with global warming.

Kossin concluded that the trend has all the signs of human-induced climate change.

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