Official Discussion issued by the National Hurricane Center

Tammy (AL202023) DATA RELEASED: 10/24/2023 3:00:00 PM UTC

Copy of official data

Hurricane Tammy Discussion Number  25
NWS National Hurricane Center Miami FL       AL202023
1100 AM AST Tue Oct 24 2023

The hurricane has held steady this morning.  Satellite imagery 
depicts deep bursts of convection mainly to the north of the center 
and a large curved band around the northern and eastern portions of 
the system.  The most recent TAFB Dvorak satellite estimate is still 
T4.0/65kt, and the initial intensity remains at 65 kt for this 

Tammy is moving northeastward with an estimated motion of 035/6 kt. 
A mid-latitude trough over the northwestern Atlantic should steer 
the hurricane more northward in a day or so.  By day 2, most of the 
global model guidance shows Tammy turning westward and slowing down 
between two mid-level ridges through the remainder of the forecast 
period.  Only minor adjustments have been made in the latest NHC 
track prediction, which lies in the middle of the track guidance 

Intensity guidance continues to suggest Tammy should slightly 
strengthen in the near term.  As the hurricane approaches the 
mid-latitude trough, it should enter a region with enhanced 
upper-level divergence, and thus strengthen.  After about a day or 
so, strong deep-layer vertical wind shear and cooling sea surface 
temperatures should gradually weaken the cyclone.  Tammy is still 
expected to become a gale-force extratropical cyclone by 60 h.


INIT  24/1500Z 24.2N  62.3W   65 KT  75 MPH
12H  25/0000Z 25.0N  61.2W   70 KT  80 MPH
24H  25/1200Z 26.7N  59.9W   75 KT  85 MPH
36H  26/0000Z 28.6N  59.1W   70 KT  80 MPH
48H  26/1200Z 30.1N  59.5W   65 KT  75 MPH
60H  27/0000Z 31.2N  60.6W   55 KT  65 MPH...POST-TROP/EXTRATROP
72H  27/1200Z 31.8N  61.6W   50 KT  60 MPH...POST-TROP/EXTRATROP
96H  28/1200Z 32.5N  63.5W   45 KT  50 MPH...POST-TROP/EXTRATROP
120H  29/1200Z 32.6N  65.1W   40 KT  45 MPH...POST-TROP/EXTRATROP

Forecaster Bucci