You look at the full basin view of the Atl. on WV and that is is one menacing ULL at 30'N and 50'W.The ULL is not moving much now but is already affecting the signature of Ivan to the NE.The ridge to the N seems to be pushing ever so slightly into the Bahamas SW.Then you look at the GOM and thier seems to be seperation of the air mass in the center of the GOM.The ULL seems to be at the time being causing some of the push on the ridge to Ivan's NNW.I am probably wrong but that little push could it temporarily make Ivan move in a more W track later? I would not think for long but maybe enough to miss Jamacia.