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Tropical Hurricane Ida

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That eye though still looks absolutely perfect


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I guess its been mentioned, but it's the anniversary of hurricane Katrina. I thought it was interesting for that??
 
It continues to go downhill in New Orleans and the pressure gradient is now up to 6 mb over just a 15 mile distance!

5 PM CDT:

N.O. INTL ARPT HVY RAIN 76 75 97 E48G74 29.16F VSB 1/2

N.O. DWNTWN HE HVY RAIN 77 75 93 E23G46 29.27F VSB 3/4

N.O. LAKEFRONT HVY RAIN 77 76 96 E54G78 29.34F VSB 1/2



 
Chazwin said:
Does anyone know exactly how much of a water rise would cause water to start topping over the levees?
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This article says this about the West side. But it's breaching on the south side now.


"Starting with a giant surge barrier east of the city, the system is a 130-mile (210-kilometer) ring built to hold out storm surge of about 30 feet (9 meters). The National Hurricane Center on Friday projected Ida would bring a surge of 10 feet to 15 feet (3 to 4.6 meters) on the west bank.

At that level, it could come over the levees in some areas, said emergency manager Heath Jones of the Army Corps of Engineers’ New Orleans District.

“They’re designed to overtop in places” with protections against worse damage, including armoring, splash pads and pumps with backup generators, he said."

 
Wild Weather Monger said:
I've been thinking about the MRGO dam as well as the 32-foot floodgate that keeps Lake Borne from flooding Lake Ponchatrain. Thank God they were built, otherwise, this storm could have been so much worse. But, I can't help thinking about what a disaster it would be should particularly the Lake Borne gates, suddenly fail while holding back a 15-30 foot surge.
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Just for clarification, the Lake Borgne Surge Barrier has no bearing on levels in Lake Pontchartrain. There have been talks of an Oosterscheldekering-like structure to block surge coming into the estuary, but it's big money and has some pretty substantial ecological considerations to overcome.
 
Arcc said:
The scary fact is unless we see rapid weakening, that 120-135mph sustained wind will be realized over Lake Pontchartrain and drive a massive surge into the west of it.
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TWC just said the same. And said it will push surge into Laplace, west of the lake, at the same time that Laplace is hit by the high winds.
 
Nash_LSU said:
Just for clarification, the Lake Borgne Surge Barrier has no bearing on levels in Lake Pontchartrain. There have been talks of an Oosterscheldekering-like structure to block surge coming into the estuary, but it's big money and has some pretty substantial ecological considerations to overcome.
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So I thought they had built a floodwall there and locks at the Rigolets to prevent filling Ponchatrain from the sound prior to an incoming cane. No?
 
Going rapidly downhill at N.O. (Ignore the 32 dewpoints).

Intl Airport dropped 5 mb in the last hour and has 1/4 mile vis. There now is a whopping ~9 mb difference between there and Lakefront!



N.O. INTL ARPT HVY RAIN 77 32 19 E56G83 29.01F VSB 1/4

N.O. DWNTWN HE RAIN 78 76 93 MISG N/A VSB 1

N.O. LAKEFRONT HVY RAIN 77 32 19 E46G71 29.27F VSB 1/2
 
Wild Weather Monger said:
So I thought they had built a floodwall there and locks at the Rigolets to prevent filling Ponchatrain from the sound prior to an incoming cane. No?
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The LBSB, despite it's large scale when standing beneath it, is somewhat small in the grand scheme of things. It is in red in the picture. It's job is to keep surge from entering the intracoastal/Industrial Canal and penetrating into the city core. There is no structure that limits flow between Pontchartrain and the Gulf/Lake Borgne.

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Nash_LSU said:
The LBSB, despite it's large scale when standing beneath it, is somewhat small in the grand scheme of things. It is in red in the picture. It's job is to keep surge from entering the intracoastal/Industrial Canal and penetrating into the city core. There is no structure that limits flow between Pontchartrain and the Gulf/Lake Borgne.

View attachment 89773
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Thanks! I've been gone from home too long lol.
 
Anyone think this may get updated to a cat 5 after all the damage assessments?


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Arcc said:
Some of the video I’m seeing easily rivals the worst of Michael.
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That would be crazy if it gets upgraded after the fact like Michael but I think it's possible. The lack of weakening for hours is another clue I know it was swamp but still. That's not normal
 
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Jessy89 said:
Anyone think this may get updated to a cat 5 after all the damage assessments?


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Possibly, but I think they will have to find damage that suggests it over just recon. In Michael they had flight level winds when reduced for height reached Cat 5 at the surface(they don’t to my knowledge here) and surface wind measurement from the aircraft that backed it up along with sub920mb pressure. I did see a sonde in the northern eyewall that had 161mph at the surface here, so they may use it and be enough, but who knows.
 
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