Official Discussion issued by the National Hurricane Center

Paulette (AL172020) DATA RELEASED: 9/10/2020 3:00:00 AM UTC

Copy of official data

Tropical Storm Paulette Discussion Number  13
NWS National Hurricane Center Miami FL       AL172020
1100 PM AST Wed Sep 09 2020

Paulette remains a sheared tropical cyclone with the low-level 
center southwest of a large area of deep convection.  Recent 
scatterometer data showed peak winds of 45-50 kt, so 50 kt is used 
as the initial wind speed, which happens to be quite similar to a 
blend of the latest TAFB/SAB Dvorak estimates.   Paulette should 
begin to weaken tomorrow and continue on a downward trend for 2-3 
days as strong shear impacts the cyclone.  No change has been made 
to the forecast through Saturday. Thereafter, the storm is likely to 
move into a lower-shear environment on the northeastern side of a 
mid/upper-level low, with SSTs rising to about 29C. There is better 
agreement among the models tonight that Paulette will survive the 
shear and be able to take advantage of that favorable environment.  
In fact, almost all of the most reliable guidance, save LGEM/SHIPS, 
show the storm becoming a hurricane by 120 hours, and the global 
models are trending in that direction.  The new NHC forecast is 
raised from the previous one, near the model consensus, but isn't 
quite as high as the regional hurricane models.

The storm is moving at about the same motion as before (295/9 kt).  
Paulette should turn westward tomorrow as it weakens and encounters 
stronger low/mid-level ridging.  A weakness in the ridge develops by 
the weekend due to the aforementioned mid/upper-level low, which  
should cause the tropical cyclone to turn and move faster toward 
the northwest. The new NHC track forecast is very similar to the 
previous one, lying on the western side of the guidance after 
placing heavier weight on the global models and corrected-consensus 
aids than on the regional hurricane guidance. 


INIT  10/0300Z 20.9N  48.1W   50 KT  60 MPH
12H  10/1200Z 21.3N  49.5W   50 KT  60 MPH
24H  11/0000Z 21.4N  51.5W   45 KT  50 MPH
36H  11/1200Z 21.9N  53.2W   40 KT  45 MPH
48H  12/0000Z 22.8N  54.6W   40 KT  45 MPH
60H  12/1200Z 24.1N  55.9W   40 KT  45 MPH
72H  13/0000Z 25.8N  57.3W   45 KT  50 MPH
96H  14/0000Z 29.0N  62.0W   55 KT  65 MPH
120H  15/0000Z 31.0N  65.0W   65 KT  75 MPH

Forecaster Blake