said by ropeguru:
According to NHC:
LANDFALL - The intersection of the surface center of a tropical cyclone with a coastline.
That's pretty much what I was thinking it is. In this case, with that definition, the actual first landfall time could have been judged + or - 8 hours. What I used (right or wrong) if the storm has an eye wall, and land has made it inside the eye wall, then it has made land fall. Then again they may not have considered the long, very lightly populated, area of Louisiana, where the Mississippi outflows into the Gulf as real land.