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August 31st, 2008 8:10 pm

Gustav’s approach

The 11:00 PM EDT advisory is out. Gustav’s intensity appears to have plateaued, and it’s expected to make landfall right around its current intensity — a borderline Category 2/3 hurricane — in the late morning or around noon, in the marshlands south of Houma. That city of 30,000, where The Weather Channel’s Jim Cantore is stationed, will take the brunt of the storm. Significant deviation from this track now appears unlikely (though small, last-minute “wobbles” are always possible).

New Orleans will most likely dodge a bullet, avoiding catastrophic flooding, unless the levees perform worse than expected. This will not be the “mother of all storms.” There may be significant flooding in the West Bank, but if so, it will be mostly because of the levee system’s fragile and incomplete state, not because of anything extraordinary about Gustav. In any case, we should not see a citywide repeat of Katrina — let alone something worse, as once seemed quite possible — assuming the Army Corps of Engineers has done its job this time.

The media should, at this point, be ramping down the hype about Gustav. Twenty-four hours ago, the hype was justified, and the evacuation of New Orleans was totally appropriate and necessary. But now, anyone who is still treating Gustav like some sort of unprecedented apocalypse is just ignoring the data. There will be death and destruction, yes, but certainly not on a “storm of the century” scale. Gustav is no longerexpected to rival Hurricane Katrina in its destructive power.” And the worst effects will be south and west of the Crescent City — again, assuming the New Orleans levees do their job. The storyline now isn’t, will the monstrous Hurricane Gustav destroy New Orleans? It is, will the levees perform up to snuff this time, and survive a surge that they manifestly should be able to handle? (This is a reasonable question, of course, since they also should have handled Katrina.)

Journalists often fail to grasp how quickly and drastically things can change with hurricanes. Yesterday evening, we were looking at a 150 mph monster in the Caribbean, and imagining intensification in the Gulf today to perhaps 175 mph, with limited opportunity for pre-landfall weakening. Instead, thanks to its totally unexpected post-Cuba weakening and failure to intensify significantly over the Loop Current, Gustav now looks to be a run-of-the-mill, low-end Cat. 3 event, at worst. Top winds right now are 115 mph, which are of course nothing to sneeze at — but this is just a regular old major hurricane, not a world-historical event. It may even weaken to Cat. 2 before coming ashore. If journalists continue to act like Gustav is going to be the end of the world, it will only feed public cynicism about hurricane warnings once it comes ashore and “disappoints.”

Anyway… I’m about to go to bed. I’ll try to post an update early in the morning, but I have plans tomorrow and I may not be able to blog again until midday — at which point Gustav will probably be making, or will have just made, landfall in Louisiana. To keep things fresh, here is a constantly updated, live NWS radar loop from New Orleans:

Also, there’s a wealth of good information at the sites listed in my sidebar at right, so if you want the latest even when I haven’t updated this site in a while, just look there. In particular:

* For news from Louisiana, the Times-Picayune Hurricane Center, the WWL-TV live stream, and Best of New Orleans Blog.

* For the latest official information on the storm, the National Hurricane Center. Specifically, the latest forecast track is always here.

* For live satellite imagery of Gustav, the visible satellite loop, the infrared satellite loop.

* For radar imagery of Gustav, the New Orleans long-range and short-range loops; the Mobile, AL long-range and short-range radar loops; and the Lake Charles, LA long-range and short-range radar loops.

* For weatherbloggers’ perspectives, Dr. Jeff Masters, Eric Berger and Alan Sullivan.

Best of luck to everyone on the Gulf Coast. My thoughts and prayers are with you.

P.S. A reminder: timestamps at the top of each post are in PDT, which is three hours behind EDT.

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10 Comments

1. Gustav weakens « Internet Scofflaw:

[...] Good news.  Unless something changes (unlikely at this point) or the New Orleans levees fail again [...]

Aug 31, 2008 - 10:24 pm 2. Anton:

The guys who kept blogging from Zipa datacenter during Katrina (Interdictor) are doing it again for Gustav. The URL: http://gustavbloggers.com/

Aug 31, 2008 - 10:33 pm 3. David Thomson:

Pretty good analysis. Far better than I am receiving from the MSM. It keeps implying that the world is about to end. A category 3 hurricane should not destroy New Orleans. The city should endure some moderately strong winds and a lot of rain. Nothing more than that. Those elderly people who died leaving the city should have stayed home. They would have been at less risk.

Aug 31, 2008 - 10:41 pm 4. Pajamas Media » Gustav is No Katrina:

[...] Track the storm here… [...]

Sep 1, 2008 - 12:43 am 5. RazorsKiss:

I’m in Gulfport, MS, and liveblogging it at http://razorskiss.net/wp/2008/09/01/liveblogging-gustav/

Sep 1, 2008 - 1:52 am 6. Brendan Loy:

David, your analysis is flawed. You cannot judge whether evacuations were necessary based on how Gustav looks NOW, because evacuation decisions cannot be made 12 hours before landfall. You have to judge based on how Gustav looked when the decision was made. And when the decision was made, Gustav was at 150 mph, and it appeared likely that it would weaken only slightly over Cuba, then get even stronger over the Loop Current. That these things did not happen is incredibly lucky, but when the evacuation was made — when it had to be made — we couldn’t count on such good luck.

The evacuation of New Orleans was totally, indisputably necessary. That three people tragically died in the evacuation does not change that fact. Yes, evacuations themselves are always risky. They aren’t cost-free. But if the last 30 hours had turned out a bit differently — and, as of Saturday night, we had no right to assume they wouldn’t — the death toll in New Orleans, had people stayed, could have been counted in the thousands.

Hindsight is 20/20, my friend. It is grossly irresponsible, always, to criticize evacuation decisions based on hindsight. You must judge them based on contemporaneous facts.

Sep 1, 2008 - 3:18 am 7. Greg:

I agree with Brendan. The evacuations were appropriate. Frankly, even a slow moving Cat 3 coming in at the worse case landfall could destroy New Orleans.

My gut feeling is that overall the levees are better than before Katrina but we still have wetlands loss, and the infrastructure in the city itself is fragile.

I also believe that much of the repairs on homes has been shoddy, and many homes are more subject to wind damage.

At this time yesterday, we all still expected Gustav to get back up to Cat 4 minimally, and we did not know where landfall would be. A Cat 4 with a Besty landfall would have been the big disaster.

Sep 1, 2008 - 3:44 am 8. David Thomson:

“And when the decision was made, Gustav was at 150 mph”

What does the historical record indicate? What are the odds that the threat would greatly diminish before it hit New Orleans? How often has the city actually been hit by 150 mph winds? Were the odds one in five, one in a hundred, or even lower than that. I could admittedly be wrong. You have studied this matter in far greater depth than myself. Nonetheless, I wonder if the odds makers would have concluded that the elderly should have remained closer to home.

Sep 1, 2008 - 11:20 am 9. mjk:

Where’s the Messiah? Can’t he just go there, get out into a boat, and shout “Peace”?

Still, hoping everything works out and no one loses their lives in this storm.

Sep 1, 2008 - 12:54 pm 10. Starscream:

Some issues but nothing bad. This site has some good photos of it:

http://philadelphiaweather.blogspot.com/2008/09/levee-breech-in-suburban-nola.html

Sep 1, 2008 - 4:48 pm

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