WTNT45 KNHC 290836

Post-Tropical Cyclone Tammy Discussion Number 40
NWS National Hurricane Center Miami FL AL202023
500 AM AST Sun Oct 29 2023

During the past 18 to 24 hours, Tammy has only been maintaining a small and disorganized patch of deep convection well to the northeast of the fully exposed center. Accordingly, the Dvorak classifications have been decreasing, and the latest estimate from TAFB is a T1.0/2.0. Satellite images also show that the low-level center has become elongated and is losing definition. Based on these characteristics, Tammy no longer qualifies as a tropical cyclone, and this is the last advisory on this system. The initial intensity is held at 35 kt.

Tammy is moving eastward at 16 kt in the mid-latitude westerlies. A fairly sharp turn to the south is expected to occur tonight followed by a motion to the southwest on Monday and Tuesday as the post-tropical cyclone moves around the east side of a building subtropical ridge. Tammy is expected to slowly weaken due to continued strong vertical wind shear and dry air entrainment, and it will likely dissipate in a few days.

Additional and future information on this system can be found in High Seas Forecasts issued by the National Weather Service, under AWIPS header NFDHSFAT1, WMO header FZNT01 KWBC, and online at ocean.weather.gov/shtml/NFDHSFAT1.php


INIT 29/0900Z 32.4N 53.3W 35 KT 40 MPH...POST-TROPICAL 12H 29/1800Z 31.6N 50.4W 30 KT 35 MPH...POST-TROP/REMNT LOW 24H 30/0600Z 30.1N 47.6W 30 KT 35 MPH...POST-TROP/REMNT LOW 36H 30/1800Z 28.5N 46.7W 25 KT 30 MPH...POST-TROP/REMNT LOW 48H 31/0600Z 27.2N 46.6W 20 KT 25 MPH...POST-TROP/REMNT LOW 60H 31/1800Z 26.1N 48.0W 20 KT 25 MPH...POST-TROP/REMNT LOW 72H 01/0600Z...DISSIPATED

$$ Forecaster Cangialosi