Saturday, 18 August, 2018

East Pacific's 1st named storm stronger, no threat to land

Hurricanes Are Lingering Longer. That Makes Them More Dangerous. Hurricanes Are Slowing Down and Leaving More Damage When They Hit Land
Cary Marshall | 09 June, 2018, 20:52

"The slower the storm gets, the more rain an area will get", said Jim Kossin.

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.

The unusually slow-moving Hurricane Harvey was a recent example.

"The poles tend to become disproportionately warmer than the tropics do under global warming", Kossin said.

Tropical cyclones around the world are moving slightly slower over land and water, dumping more rain as they stall, just as Hurricane Harvey did a year ago, a new study found. But when Atlantic storms hit land - like Harvey - the study said the slowdown is a significant 20 percent.

Is Hurricane Harvey a preview?

In his paper, Kossin found yet another way changes in storm patterns are sparking greater devastation.

Harvey stalled out over Texas last August, dropping Biblical rainfall that caused catastrophic flooding in the Houston area.

Hurricanes are slowing down worldwide, a new study reports.

More news: Stephens denies Keys revenge, reaches French Open final

'The laws of thermodynamics reveal that, as the atmosphere warms by 1°C, the amount of moisture it can hold increases by 7 per cent.

Kossin estimates that hurricanes have already slowed down enough that they could in theory double local rainfall and flooding.

Another study that came out recently, using computer models, concluded that future storm movements will slow because of climate change. NOAA researchers say the flooding was the main cause of 68 deaths and $125 billion in damage.

Why are storms slowing down?

"A lot of the initial research has been focused largely on numbers of tropical cyclones and then of course on intensity because that's the way that we feel the impacts", Christina Patricola, an atmospheric scientist at Lawrence Berkeley National Laboratory, told the Los Angeles Times. "And that has effects on circulation - typically slows it down".

Therefore, it would make sense that if the flow around the hurricanes and typhoons is moving slowly, the storms will also be moving slower, which Kossin believes is what he is observing in the data.

Scientists expect climate change is going to make tropical cyclones - including hurricanes - more severe.

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

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