Sun Jul 08 2018 05:04 AM

Tropical Storm Chris Discussion Number 7
NWS National Hurricane Center Miami FL AL032018
500 AM EDT Sun Jul 08 2018

Although the winds associated with the tropical storm have increased
a little, the overall organization of Chris has not changed much
over the past few hours. The low-level center is still exposed to
the north of a broken band of deep convection and the cyclone lacks
an inner-core. Chris is located over very warm SSTs and will
remain so for the next several days. While the broad nature of the
cyclone's circulation and some moderate shear will likely limit the
intensification rate over the next day or so, all of the intensity
guidance indicates that Chris will become a hurricane within about
72-h. By day 4, the intensity forecast is more uncertain,
and depends strongly on the timing of Chris crossing the Gulf
Stream, since the cyclone is expected to continue to intensify as
long as it remains over warm waters. Once extratropical transition
begins, weakening should occur as the wind field broadens. The new
intensity forecast is close to HCCA and IVCN through day 3, and
slightly lower beyond that, closer to the previous forecast.

The track guidance has once again made a large shift with the latest
forecast cycle. While Chris is generally expected to continue to
meander off the coast of the Carolinas for the next couple of days
before accelerating to the northeast ahead of a deep-layer trough
approaching from the northwest, the timing of this acceleration is
highly uncertain. Nearly all of the dynamical models have now
shifted to the south and west of their previous forecasts throughout
most of the forecast period. The NHC track forecast has been
adjusted in that direction, but now lies on the eastern side of the
guidance envelope, and shows a faster motion than most of the
models. Given the large run-to-run inconsistency of the guidance
over the past 24 hours, I would prefer to wait to make a more
significant change to the forecast until a more clear pattern

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