Home World Hurricane Ida's 150mph winds just made the Mississippi river do something very...

Hurricane Ida's 150mph winds just made the Mississippi river do something very strange…

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New Orleans marked the 16th anniversary of the devastating Hurricane Katrina, that hit in 2005 with 125mph winds and killed 1,800 people. And this weekend, the area was hit by another natural disaster as Hurricane Ida made landfall near Port Fourchon early on Sunday afternoon. 

The storm had become a category 4 hurricane with winds of 150mph before striking land, making it even more powerful than the hurricane that hit the region all those years ago.

But one more striking similarity between the two storms is the bizarre effect landfall made on the Mississippi River, as experts say the storm actually stopped its flow.

In fact, the storm was so powerful it even caused the 2,320 miles river to reverse – something the US Geological Survey (USGS) says is “extremely uncommon.”

The agency’s gauge at Belle Chasse, south of New Orleans, detected the bizarre change at about midday on Sunday, while a US Army Corps of Engineers spokesman confirmed engineers detected a “negative flow” as a result of the storm surge.

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The hurricane also caused the river level to rise by about seven feet, the USGS added.

While the flow slowed “from about 2 feet per second down to about half a foot per second in the other direction”, according to Scott Perrien from the USGS Lower Mississippi Gulf Water Science Center.

He told CNN: “The river is feeling the effects of the storm over a large area. All the way up to Baton Rouge the river has risen 1.5 feet in the past 12 hours as the surge pushes up the river.

“And the water level will likely rise more in the coming hours here in Baton Rouge.”

Prior to Ida making landfall, the river had a discharge rate of 300,000 cubic feet per second.

But once the storm hit, the Mississippi was flowing at 40,000 cubic feet – and up river.

The gauge only measures one section of the river, however, so it is possible that deeper sections did not reverse flow.

But the recordings did show the river, which normally measures 8-10 feet, rose to more than 16 foot.

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The bizarre incident bears a striking resemblance to the 2005 Hurricane Katrina, when a similar occurrence happened.

Mr Perrien added: “I remember, off hand, that there was some flow reversal of the Mississippi River during Hurricane Katrina, but it is extremely uncommon.”

The River also began to flow backwards during Hurricane Isaac in 2012.



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