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  • This is hurricane durian on September 1st, 2019 and

  • Here it is more than 24 hours later still pummeling those same islands

  • you see

  • Hurricane durian. It's stalled right there in its path

  • In fact at times it was crawling across the Bahamas at just one point six kilometers per hour

  • That's slower than the average person walks

  • So what causes hurricanes like durian to stall and why does it matter?

  • First of all, durian is not the first hurricane to stall not even close actually in

  • 2018 for example hurricane Florence spent more than 50 hours within one small region of North Carolina and the year before

  • Harvey, lingered over the houston area for more than two days straight, but in every case

  • Hurricanes, that stall are really bad news

  • Because the longer they linger the more rain they unload and the more damage they deal

  • Harvey for example dropped more than sixty inches of rain in some parts of Texas and it cost the country an estimated

  • 125 billion dollars

  • doreen on the other hand dropped more than 36 inches of rain in some regions and is expected to have a

  • multi-billion dollar price tag as well

  • So then why - hurricane stall in the first place think of a hurricane like a cork bobbing in a stream although it produces

  • Its own wind and spin it actually travels. Thanks to larger wind patterns

  • Which carry it along those wind patterns themselves evolve and change and sometimes

  • The winds that guide to hurricanes collapse endures what you might think of as a stagnation point. That's Tim Hall

  • I'm a senior scientist at NASA's Goddard Institute for Space Studies in New York

  • And he says that at these stagnation points a hurricane has nowhere to go

  • So it just sits there

  • Dropping rain until another wind system picks it up and pushes it along and that's exactly what happened in the Bahamas

  • When Dorian arrived a pressure system nearby called the North Atlantic

  • subtropical ridge started to weaken and

  • That caused winds that were carrying the hurricane to essentially stopped blowing and it will definitely happen again

  • in fact those stagnation events

  • They're actually becoming more common and as a result, so are hurricanes that stall

  • according to Hall's research there were 66 hurricanes that stalled in the North Atlantic between 1944 and

  • 2017 and nearly half occurred in the last third of that time frame

  • Which helps explain another trend the average speed of hurricanes in a given year is declining

  • in fact compared to the mid 20th century

  • Hurricanes today are moving on average about 17% slower

  • Scientists still aren't sure why but we've got some suspects and the suspects are that in a warming climate

  • climate model simulations show both in the future and in the past several decades

  • a

  • reduction in the overall

  • tropical wind patterns and

  • Unfortunately a stalled hurricane isn't the only consequence of climate change

  • It's also been shown to worsen storm surge increased rainfall and produce more intense storms

  • So while durian is of course devastating, it's likely just one of many hurricanes like it still to come

  • You

This is hurricane durian on September 1st, 2019 and

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B1 hurricane durian stall wind north atlantic bahamas

Why Hurricanes Get 'Stuck'

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    林宜悉 posted on 2020/11/10
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