Tropical cyclones, hurricanes are slowing down, study says

Hurricanes are slowing down, causing more damage in coastal communities

Unhurried hurricanes: Study says tropical cyclones slowing

Hurricanes and tropical storms, known as tropical cyclones, are moving slower around the planet, according to a new study from National Oceanic and Atmospheric Administration scientist James Kossin.

The center said a tropical storm was expected to form by Wednesday morning and then strengthen into a hurricane by early Thursday.

The U.S. National Hurricane Center said Tropical Storm Aletta was centered about 425 miles (680 kilometers) southwest of Manzanillo, Mexico, late Wednesday.

The Atlantic Basin remains inactive and the storm now has a zero threat to life or land. "The storms will stay in your neighborhoods longer".

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. Still, the shift is precisely what he and other cyclone experts said would be expected from climate change.

Kossin said the findings were of great importance to society.

In an editorial accompanying Kossin's work, she points out that it raises several new questions. Given that storms in some regions are migrating poleward and already increasing in intensity, cyclones delivering unusually powerful bouts of rain may threaten places not normally in their path. Rainfall, on average, increased 24 percent. The VIIRS image showed a better, more organized circulation center with consolidating banding of thunderstorms wrapping into a well-defined low level circulation center. "That has serious implications for inland flooding and urban infrastructure".

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. And there are limits to each approach.

Severe storms will develop across the Plains into the Midwest today.

But both scientists say the importance is in the bigger picture. "Not quite like a cork in a stream, but similar", he said. "And, unfortunately, this signal would point to more freshwater flooding".

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