Truthfully, it is something I have noticed on the Cat 4 and Cat 5's. These stronger storms, IMHO, seem to exert a bit of an influence in the local enviroment that seems to retard some of the forces in front of it. Maybe saying west is a bad term. Most of these storms are already moving in a generally western to WNW motion when I have seen this. It is probably more if a fluid dynamic that is associated with the strongest velocities being in the front right quadrant. Most of the time, that quadrant will be heading W or WNW. Hence my feeling of the extra force being exerted to force it more westerly then the models take into account.

This is all on personal observation with backyard physics. No good science in it.

Defective l key on this laptop keeps dropping l's