Weakened shear allowed Cindy to strengthen more as it approached Louisiana and was a minimal hurricane with 75 mph ( 120 km\/h ) winds for a very short time when it made landfall near Grand Isle late on July 5 . Weakened shear allowed Cindy to strengthen further as it approached Louisiana and the storm was a minimal hurricane with 75 mph ( 120 km\/h ) winds when it made landfall near Grand Isle late on July 5 .