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Tropical Depression SANDRA

Tropical Depression Sandra Discussion Number   8
NWS National Hurricane Center Miami FL       EP192021
100 AM PST Tue Nov 09 2021

Satellite classifications and recent scatterometer surface wind 
data indicate that Sandra is barely hanging on a tropical cyclone. 
The closest convection, which has been waning over the past few 
hours, is located about 75 nmi east of the fully exposed low-level 
circulation center. That distance barely meets the Dvorak criteria 
for classifying Sandra as a tropical depression. The intensity has 
been lowered to 25 kt based on 0235Z ASCAT-A scatterometer data 
that revealed a few 25-kt surface wind vectors located about 50 nmi 
north of the cyclone's center. Additional weakening is anticipated 
due to the continued combination of strong southerly vertical wind 
shear of 25-30 kt and intrusions of dry mid-level air. As a result, 
Sandra is forecast to degenerate into a remnant low later today and 
dissipate by Wednesday.
Sandra is now moving a little south of due west, or 260/12 kt. A 
strong ridge to the north of the cyclone should keep Sandra moving 
westward to west-southwestward through Wednesday. The new NHC track 
forecast is very similar to the previous advisory, and lies close 
to the middle of the various consensus track models.

INIT  09/0900Z 14.8N 119.7W   25 KT  30 MPH
 12H  09/1800Z 14.5N 121.3W   25 KT  30 MPH...POST-TROP/REMNT LOW
 24H  10/0600Z...DISSIPATED
Forecaster Stewart