Here. Like many blogs, it's in reverse chronological order. Scroll down to August 26th (boldface his):

New Orleans in peril
8/26/2005 01:57:00 PM EST
Posted by Brendan Loy

At the risk of being alarmist, we could be 3-4 days away from an unprecedented cataclysm that could kill as many as 100,000 people in New Orleans. Such a scenario is unlikely -- the conditions would have be just right (or rather, just wrong) -- but IMHO, it's not nearly unlikely enough to feel good about things. If I were in New Orleans, I would seriously consider getting the hell out of dodge right now, just in case. Once the evacuation orders are issued, if it comes to that, it'll inevitably be an absolute madhouse, despite officials' best efforts.