Of course, it could also be moving due west due to the "heavy" part of the storm......the heaviest rain etc. being right now in the sw corner. That could be dragging it down to the due west movement. Once more convection fires all around, it may resume its wnw to nw movement.
Emily seems kindof irradic in her path, one moment she going nw, the next west or wnw. Must be a lot of stuff going on where she is at. Just about every model I ran today, hat her hitting N. Mexico or S.Texas. So I think it is a prteety good bet she is not going to hit N.Mexico or S. Texas. LOL.