Yes, the surrounding pressures earlier were lower than "normal" - someone mentioned that. Still, 939 seems very low for a cat 3 storm, and a "minimal" cat 3 storm at that.

ETA: 10pm CT package. Forecast changed by .1 of a degree to the east I think, if at all. Intensity remains 115 MPH, forecast is basically identical. Storm moving at 290 degrees now at 6kts, expected to turn to the NW tomorrow. Landfall projected intensity near 125 knots. Discussion indicates the difficulty in intensity forecasting with regard to ERC.

Weather Underground map shows landfall at New Orleans., between Sunday and Monday, which is the current global consensus, although I still believe that is too far west.