This was in the RAH mid-morning discussion.
Latest upr air data over the sern US this morning indicates a
developing mid-upr level ridge there is already 10-20 meters
stronger than forecast. This strengthening ridge is separated from
an even stronger sub-tropical ridge situated several hundred miles n
of Bermuda, by a tropopause-level trough axis stretching from about
100 miles east of HSE sswwd to an embedded circulation 200 miles
east of JAX, sswd to another circulation centered about 150 miles
north of the Yucatan. The presence of both that trough axis, and the
developing/expanding ridge over the sern US, will ultimately serve
to slow/halt the nwwd progress of powerful Hurricane Florence,
particularly by Thu, when the anomalously strong ridge n of Bermuda
weakens and drifts swwd.