Isaac Bearing Down on New Orleans

As I write this, Tropical Storm Isaac, expected to soon be upgraded to hurricane status, is bearing down on the New Orleans area of Louisiana, threatening to repeat the disaster of seven years ago with Katrina.  To be sure, Isaac will be just a minimal hurricane compared to its much stronger predecessor and the city seems to be undergoing a more orderly evacuation with the goal to avoid having so many trapped in massive flooding in an area that is mostly under sea level.  But forecasts have the storm slowing and even lingering there for a couple of days, dumping an enormous amount of water in the process.  Will the levees hold this time, or will they break once again and cause the city to go underwater? 

In the meantime, the Florida peninsula has been undergoing its own storms, as a huge section of Isaac seemed to separate and hang over the state just as its center turned westward toward Louisiana.  For the last couple of days, we have had copious amounts of rain, with more expected.  Still, the bulk of this stormy area has moved offshore into the Atlantic, sparing us extreme flooding.  South Florida seems to have gotten the worst so far; this is soon to change when the Louisiana coast and adjacent areas suffer Isaac's full onslaught...