Official Discussion issued by the National Hurricane Center

Alpha (AL242020) DATA RELEASED: 9/18/2020 9:00:00 PM UTC

Copy of official data

Subtropical Storm Alpha Discussion Number   2
NWS National Hurricane Center Miami FL       AL242020
900 PM GMT Fri Sep 18 2020

Radar data from Portugal indicated that Alpha made landfall at about 
1830 UTC with a fairly impressive spiral band signature. It is 
estimated that the winds were 45 kt at landfall, and a sustained 
10-minute wind of 39 kt was recorded at Sao Pedro de Noel. The 
minimum central pressure is analyzed at 996 mb at landfall due to a 
999 mb value at Monte Real with a 31-kt sustained wind. Since these 
data were recorded, the radar presentation has deteriorated, and 
satellite imagery suggests the small cyclone could be de-coupling 
from its mid-level center.  The winds are assumed to have come 
down, with a current estimate of 40 kt.  The small cyclone should 
continue to move northeastward at about 15 kt for the next 12-24 
hours before dissipating over northern Spain or the Bay of Biscay. 
No significant changes are required to the forecast for track or 

Additional information on the hazards from this system can be found
in products from the Portuguese Institute for Sea and Atmosphere at


INIT  18/2100Z 40.4N   8.4W   40 KT  45 MPH...INLAND
12H  19/0600Z 42.1N   6.1W   25 KT  30 MPH...POST-TROP/INLAND
24H  19/1800Z...DISSIPATED

Forecaster Blake