Saturday, 23 June, 2018

Hurricanes Slower Moving Now, Dump More Rain, Study Finds

Hurricanes are slowing down, causing more damage in coastal communities Unhurried hurricanes: Study says tropical cyclones slowing
Theresa Hayes | 08 June, 2018, 21:09

But he says there's good evidence that the warming planet could weaken the global winds that push storms around. He found hurricanes in 2016 moved an average of 10 percent slower than hurricanes in 1949.

In the last 70 years the storms have slowed by ten per cent. In the Atlantic region, storms moved 20 percent slower over land, the study found. To help, the Texas General Land Office partnered up with the University of Texas to conduct a survey for Texans who live in the affected areas, asking if they are still displaced and how much damage to their homes still need to be fixed.

Kossin published his findings Wednesday in the journal Nature.

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.

According to Kossin's study, combining the additional water vapor available in the atmosphere from 1 degree Celsius of warming -essentially where we are now - with a 10% slowdown from tropical cyclones that he observed would double the local rainfall and flooding impacts.

"What we're seeing nearly certainly reflects both natural and human-caused changes", Kossin said.

Although commending the study for its findings, she said it is not without its limitations. Some places in Houston got roughly a foot of rain per day as the storm crawled ashore.

These lingering tropical cyclones - including hurricanes and typhoons - are increasing the risk of deadly flooding worldwide, scientists have warned. "That has serious implications for inland flooding and urban infrastructure".

Kossin acknowledged problems with pre-1970s data but said that most of it deals with how strong storms are. No storm from today will reproduce in quite the same way in the future. The fact that their results show quite similar trends should be a wake-up call.