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Tropical Storm FRED Forecast Discussion

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WTNT41 KNHC 012036

500 PM AST TUE SEP 01 2015

Fred's weakening appears to have ceased for the moment.  Deep
convection developed just north of the center since the previous
advisory and the overall organization of the tropical cyclone has
changed little during the day.  A blend of the various Dvorak
T-numbers and the earlier ASCAT data support maintaining an initial
intensity of 45 kt.  The intensity forecast reasoning remains
unchanged from the previous forecast.  Fred will be moving into an
area of increasing southwesterly shear and a less conducive
thermodynamic environment.  This should cause the tropical cyclone
to gradually weaken during the next several days, and Fred is
expected to become a tropical depression in about 36 hours and
degenerate to a remnant low in 2 to 3 days.

The initial motion estimate is 300/10 kt. Fred should continue
moving west-northwestward to the south of a deep-layer ridge over
the eastern Atlantic during the next 2 to 3 days.  The global
models predict that the western portion of the ridge will weaken
after 72 hours when a trough deepens over the central Atlantic.
After this occurs, the remnant low should turn northwestward and
northward in the low-level southeasterly flow.  The model guidance
has shifted significantly westward this cycle, with most of the
models showing a weaker Fred moving more westward.  The NHC forecast
has been adjusted accordingly, however it lies to the north of the
model consensus after 36 hours to maintain some continuity from
the previous advisory.


INIT  01/2100Z 18.8N  28.1W   45 KT  50 MPH
 12H  02/0600Z 19.4N  29.4W   40 KT  45 MPH
 24H  02/1800Z 20.0N  31.0W   35 KT  40 MPH
 36H  03/0600Z 20.6N  32.5W   30 KT  35 MPH
 48H  03/1800Z 21.3N  34.1W   30 KT  35 MPH
 72H  04/1800Z 22.0N  37.5W   25 KT  30 MPH...POST-TROP/REMNT LOW
 96H  05/1800Z 23.0N  40.0W   25 KT  30 MPH...POST-TROP/REMNT LOW
120H  06/1800Z 25.0N  42.0W   20 KT  25 MPH...POST-TROP/REMNT LOW

Forecaster Brown

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Page last modified: Tuesday, 01-Sep-2015 20:36:32 UTC