Heating, air moves and low pressure center

                                      

What Fueled Louisiana’s Deadly Flood?

"[I]n regions such as southern Louisiana and the Everglades, shallow warm water permits heating to still occur as air moves towards the low pressure center. This mimicking of aspects of the ocean conditions, including the evaporation of water vapor into the system, permits tropical systems to persist longer than they otherwise would. This is what occurred in this Louisiana deluge. "

http://dotearth.blogs.nytimes.com/2016/08/17/how-an-inland-brown-ocean-and-climate-change-may-have-fueled-louisianas-deadly-flood/?rref=collection%2Ftimestopic%2FWeather&action=click&contentCollection=timestopics&region=stream&module=stream_unit&version=latest&contentPlacement=7&pgtype=collection&_r=0