The stories are just coming in about the impacts and unusual effects of H. Isaac in the Gulf States. Here is one example: Hurricane Isaac Storm Surge Reversed Flow of Mississippi River. CSM, Sept.1
As hurricane Isaac reached southeastern Louisiana as a Category 1 storm earlier this week, it did something unusual to the Mississippi River: It threw the river into reverse.
For nearly 24 hours, according to the US Geological Survey, Isaac’s storm surge drove upriver at a pace nearly 50 percent faster than the downstream flow. This backflow produced a crest some 10 feet above the river’s prestorm height at Belle Chasse, La., in flood-beleaguered Plaquemines Parish southeast of New Orleans. The surge added eight feet to the river’s height at Baton Rouge, father north.
Other news: as of Sept. 4 a count of 13,000 home damaged from the hurricane in LA. The numbers probably will go up.
Recovery Diva 
Same flood surge upstream to NOLA in Hurricane Betsy 1965!