Courtesy of NOAA
While we fear the wind and storm surge aspect from Isaac over Southeast Louisiana, Mississippi and Alabama, there is also a very concerning trend on models.
Models have this system near stalling just inland with little movement from an early Wednesday landfall through Friday with the center merely covering a distance of 50-100 miles inland from the coast. This could support 24+ inches of rain over this low lying, flood prone region and that in itself may cause catastrophic flooding.
Check out this ECMWF run. Note the little movement Wednesday through Friday.
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