The center of Isaac appears to be describing a cyclonic loop tonight over Barataria Bay after making landfall near Southwest Pass around 6:45.
Recon reports the center is over Barataria Bay. Pressure 968 mb. Flight level winds 83 mph. Surface wind 62 mph. Eye circular, 40 nautical miles wide, ragged in nature.
The hurricane is expected to resume a northwestern motion shortly and it will make another landfall near Grand Isle. Grand Isle is under the eyewall right now and has apparently sustained significant damage. Water is waist deep there reportedly.
Satellite imagery indicates the cloud tops have warmed a little. Hopefully this means that the system will begin to slowly lose strength.
The Texas A&M/Louisiana Tech game in Shreveport Thursday night has reportedly been postponed. The Aggies will open with Florida now September 8th.
Here is the 5 day rainfall forecast from the HPC folks:

