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Tropical Storm FRED Forecast Discussion

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WTNT41 KNHC 040844

500 AM AST FRI SEP 04 2015

Fred continues to produce bursts of deep convection near and east
of the center despite being affected by at least 30 kt of westerly
vertical wind shear and dry air entrainment.  Various subjective
and objective satellite intensity estimates range between 30 and 45
kt, and based on these data the initial intensity remains 35 kt.

Fred has continued to turn a little to the left and the initial
motion is now 275/9.  The cyclone or its remnants is expected to
recurve between the subtropical ridge to the east and a deep-layer
trough to the west during the forecast period.  While the track
guidance agrees with this scenario, there remain some difference in
the speed after recurvature between the slower GFS and the faster
ECMWF and UKMET. The new forecast track is an update of the previous
track with a small nudge to the east after 72 hours, and it splits
the difference between the faster and slower track guidance
mentioned above.

It may sound like a broken record, but Fred is expected to remain
in an environment of strong shear and dry air for the next 36-48
hours.  This should cause the system the degenerate into a remnant
low within 24 hours.  The dynamical models suggests that the shear
should decrease after 48 hours, although there is poor agreement
between them as to what the upper-level wind pattern will be near
Fred.  The GFS, UKMET, and Canadian models forecast Fred or its
remnants to intensify during that time, while the ECMWF and NAVGEM
models show little intensification.  Based on these forecasts and
the statistical guidance, the intensity forecast calls for Fred to
regain tropical cyclone status at around 96 hours, albeit with a
considerable amount of uncertainty.


INIT  04/0900Z 22.1N  37.2W   35 KT  40 MPH
 12H  04/1800Z 22.3N  38.6W   30 KT  35 MPH
 24H  05/0600Z 22.6N  40.3W   25 KT  30 MPH...POST-TROP/REMNT LOW
 36H  05/1800Z 23.2N  41.7W   25 KT  30 MPH...POST-TROP/REMNT LOW
 48H  06/0600Z 24.1N  42.5W   25 KT  30 MPH...POST-TROP/REMNT LOW
 72H  07/0600Z 27.0N  42.0W   25 KT  30 MPH...POST-TROP/REMNT LOW
 96H  08/0600Z 29.5N  39.0W   30 KT  35 MPH...TROPICAL DEPRESSION
120H  09/0600Z 32.0N  36.5W   30 KT  35 MPH...TROPICAL DEPRESSION

Forecaster Beven

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Page last modified: Friday, 04-Sep-2015 08:44:32 UTC