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Hurricanes are slowing down, causing more damage in coastal communities
by Brooks Hays
Washington DC (SPX) Jun 06, 2018

First tropical storm of east Pacific hurricane season forms off Mexico
Miami (AFP) June 6, 2018 - The first named tropical storm of the east Pacific hurricane season formed Wednesday off the coast of Mexico, but posed no immediate threat to coastal communities, meteorologists said.

Dubbed Aletta, the storm is expected to build to hurricane strength early Thursday, the National Hurricane Center in Miami said.

But Mexican authorities have so far not issued any alerts about the storm, which at 0900 GMT was creating maximum winds of 75 kilometers (46 miles) per hour at a distance of 595 kilometers (370 miles) southeast of Manzanillo, a port city in the western Mexican state of Colima.

The storm was moving eastwards at a speed of 11 kilometers per hour.

A scientist at the National Oceanic and Atmospheric Administration has found a link between global warming and the speed of hurricanes.

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.

"Nothing good can come of a slower storm," Kossin told Mashable. "It's safe to say you want them [hurricanes] to get out of your neighborhood as quickly as possible."

Previous research has shown that a warmer climate can hold more water moisture, so when it rains, it rains more. However, scientists have struggled to isolate the impacts of climate change on the characteristics of extreme weather events.

"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.

When Hurricane Harvey devastated Houston in 2016, many scientists pointed to the fact that the storm hovered over the area for four days, dropping record amounts of water. It's slow speed made it especially destructive.

To understand the relationship between climate change and hurricane speeds, Kossin analyzed the paths of 7,585 tropical cyclones from 1949 to 2016. He found hurricanes in 2016 moved an average of 10 percent slower than hurricanes in 1949.

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

Kossin published his findings Wednesday in the journal Nature.

A big storm that drops a lot of rain is more dangerous if it's going slow. A fast storm can distribute its water across a wider surface area, decreasing the chance of extreme flooding. A slow storm increases the risk of damaging floods.

The speed at which hurricanes move is largely dictated by atmospheric circulation, and atmospheric circulation in the tropics has been weakening, especially in the summer, as temperature gradients between the tropics and polar regions decreases.

While the new research suggests hurricanes and typhoons are slowing down over time, more work needs to be done to improve prediction models for how hurricanes may behave in the future.


Related Links
Bringing Order To A World Of Disasters
When the Earth Quakes
A world of storm and tempest


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SHAKE AND BLOW
Oh no, here we go again: Atlantic hurricane season
Marathon, United States (AFP) June 1, 2018
Listen closely and you'll hear the groan of collective dread in Florida and the Caribbean: yes, it's already hurricane season again. Both places were pummeled last year by monster storms and both - in the case of Florida it was the plume of once-lovely coral islands known as the Florida Keys - are still struggling to rebuild. "If a storm comes through, we're screwed," said Cindy P., a 48-year-old waitress who lives in the Keys and explained houses in the area weren't yet prepared. In the C ... read more

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