Published: Fri, June 08, 2018
Research | By Raquel Erickson

Season's 1st tropical storm forms in eastern Pacific

Season's 1st tropical storm forms in eastern Pacific

"Long-duration or slower-moving storms, even when weaker, can have exacerbated impacts through prolonged wind exposure [in addition to] flooding", according to Colin Zarzycki, a project scientist with the National Center for Atmospheric Research who was not involved with the study.

A study published Wednesday in the journal Nature focuses on what is known as translation speed, which measures how quickly a storm is moving over an area, say, from Miami to the Florida Panhandle. Adding last year's storms would have made the slowdown a bit more prominent, he said.

The speed of tropical cyclones around the world has decreased globally by about 10 percent since 1949.

The slower a cyclone moves over the ocean, the more moisture and intensity it gathers; the slower it moves over the land, the more time it spends drenching it.

If Harvey is any indication of what hurricanes will look like in the future, this will create a considerable strain on countries' ability to respond financially to storms.

Global weather research has revealed Australia has some of the slackest tropical cyclones.

In the last 70 years the storms have slowed by ten per cent.

There is considerable evidence that global summertime circulation patterns in the atmosphere are slowing as a result of global warming.

"Roughly 7 percent more water vapor per degree C of warming", Kossin said. However, scientists have struggled to isolate the impacts of climate change on the characteristics of extreme weather events.

These lingering tropical cyclones - including hurricanes and typhoons - are increasing the risk of deadly flooding worldwide, scientists have warned.

The result is more rainfall and more damage to buildings as hurricanes hover over population centers for longer periods of time.

"What we're seeing nearly certainly reflects both natural and human-caused changes", Kossin said. But the study did not look at causes by using computer models to simulate the Earth with and without warming.

Like this: