"Because of the passage of an upper-level trough to the north, with Irma starting to feel the steering effects of the westerly flow of the midlatitudes." Descr

"Because of the passage of an upper-level trough to the north, with Irma starting to feel the steering effects of the westerly flow of the midlatitudes." Described in detail with figures here: http://cliffmass.blogspot.com/2017/09/american-versus-european-models-and.html http://cliffmass.blogspot.com/2017/09/american-versus-europe...