Aletta becomes first hurricane of eastern Pacific season

Katie Ramirez
June 9, 2018

Yet tropical cyclones, which include hurricanes, have grown more sluggish since the mid-20th century, researchers say.

On average, the storms moved 2 kilometers per hour slower in 2016 compared with 1949-a change of 10% during a period when Earth warmed by 0.5⁰C.

Dr Kossin said: 'Tropical cyclones over land have slowed down 20 per cent in the Atlantic, 30 per cent in the western North Pacific, and 19 per cent in the Australian region.

That's the real risk of a slower storm. It said the storm was forecast to keep moving out into the Pacific.

Hurricane Harvey, which progressed at a walking pace over eastern Texas after making landfall in late August, dumped rain in amounts that were a record from a tropical system in the United States: more than 60 inches.

Kossin started his research before the 2017 season, stopping his analysis at 2016.

These two trends ought to work in tandem to make today's storms much worse rainmakers.

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"Every one of the hazards that we know tropical cyclones carry with them, all of them are just going to stick around longer", Kossin said.

In a warming world where atmospheric circulations are expected to change, the atmospheric circulation that drives tropical cyclone movement is expected to weaken. It was also based exclusively on observations and didn't use computer models to simulate the Earth with and without warming. It is based exclusively on past observations, he said.

But Kossin can't say whether Harvey's rains are a model for the future.

Outside scientists were skeptical.

Kossin said the findings were of great importance to society.

According to the research of climatologist James Kossin, the rise in global temperatures is leading to a slowdown in the speed of hurricanes and typhoons, allowing them to linger atop coastal communities and inflict more damage.

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