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Tropical Depression FIFTEEN-E


Tropical Depression Fifteen-E Discussion Number  16
NWS National Hurricane Center Miami FL       EP152017
800 AM PDT Fri Sep 15 2017

The depression has not really improved in organization, and there
still appears to be east-northeasterly shear displacing the deep
convection to the southwest of the center.  The intensity remains 30
kt based on a blend of TAFB and SAB Dvorak estimates.  The shear
over the depression is expected to decrease soon, reaching a minimum
in about 24-36 hours.  Therefore, some strengthening appears
reasonable, and the depression may finally be able to become a
tropical storm on Saturday.  An increase in easterly shear should
lead to weakening by the end of the forecast period.  Some of the
models contained in ICON seem overblown on the cyclone's
intensification, so the NHC forecast is lower than the intensity
consensus and lies closest to the SHIPS model and HCCA.

The subtropical ridge to the north of the depression is expected to
push the cyclone slowly west-southwestward through 24 hours.  After
that time, a break in the ridge will develop, which should cause
the cyclone to drift northward through days 3 and 4.  A
re-establishment of the ridge by day 5 should impart a faster
westward motion by the end of the forecast period.  Based on the
latest model guidance, the new NHC forecast is a little west of and
faster than the previous official forecast, especially on days 4
and 5.


INIT  15/1500Z 15.9N 125.0W   30 KT  35 MPH
 12H  16/0000Z 15.7N 125.4W   30 KT  35 MPH
 24H  16/1200Z 15.5N 125.8W   35 KT  40 MPH
 36H  17/0000Z 15.6N 126.1W   40 KT  45 MPH
 48H  17/1200Z 16.1N 126.1W   40 KT  45 MPH
 72H  18/1200Z 17.5N 126.0W   45 KT  50 MPH
 96H  19/1200Z 18.2N 126.7W   40 KT  45 MPH
120H  20/1200Z 18.0N 128.7W   30 KT  35 MPH

Forecaster Berg