Hurricanes are slowing down, causing more damage in coastal communities

Hurricanes Are Lingering Longer. That Makes Them More Dangerous.

Hurricanes Are Slowing Down and Leaving More Damage When They Hit Land

In the second study, published in the Journal of Climate, a team led by Ethan Gutmann, with the National Center for Atmospheric Research in Boulder, tried to see how 22 hurricanes that hit in the last 13 years might be different if they hit in the future under a warmer climate. "Not quite like a cork in a stream, but similar", he said.

Dr Christina Patricola, from the Climate and Ecosystems Sciences Division at University California, Davis, says the findings raise several questions, especially regarding "stalled" tropical cyclones.

In particular, a slowing of circulation as the polar regions warm up faster than equator ought to slow down storm tracks, as well.

According to the study by Dr Jim Kossin from the National Centers for Environmental Information, tropical cyclones have slowed in both hemispheres and in every ocean basin except the Northern Indian Ocean. Tropical storm Aletta is well offshore from Mexico expected to strengthen to a hurricane, but will not affect land.

Kossin found storms moving across land in the Eastern United States slowed down 20 percent between 1949 and 2016.

Gutmann and Kossin took entirely different approaches-one looking at historical data; the other using modeling to see how storms would behave under predicted warming scenarios.

'This suggests that global warming can enhance rainfall'.

"It is plausible to say that the local rainfall impacts, the impacts from slowing, are equal to and possibly greater than the impacts from increased water vapor in the atmosphere", he said.

"The storms will stay in your neighbourhoods longer", he said.

That means that storms farther from land in the earlier part of the study may not have had their speeds included in the study.

"These trends are nearly certainly increasing local rainfall totals and freshwater flooding", Kossin said, "which is associated with very high mortality risk".

In a warming world where atmospheric circulations are expected to change, the atmospheric circulation that drives tropical cyclone movement is expected to weaken.

Hurricanes are slowing down - and leaving behind a lot more damage when they make landfall, according to a new study.

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