Home Post-Tropical Cyclone Mindy Forecast Discussion Number 6
 

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Post-Tropical Cyclone Mindy Forecast Discussion Number 6

2021-09-10 04:48:23| National Hurricane Center (Atlantic)

Issued at 1100 PM EDT Thu Sep 09 2021 483 WTNT43 KNHC 100248 TCDAT3 Post-Tropical Cyclone Mindy Discussion Number 6 NWS National Hurricane Center Miami FL AL132021 1100 PM EDT Thu Sep 09 2021 The structure of Mindy this evening has become quite diffuse, with a linear band of convection mostly associated with a prominent outflow boundary emanating away from the system. The last-light visible low-level cloud motions gave the impression that Mindy was opening up into a trough, with southwesterly flow ahead and northeasterly flow immediately behind the estimated center. Indeed, a ASCAT-A pass valid at 0002 UTC suggested that Mindy no longer has closed cyclonic flow on its northeast side, with a lack of easterly wind vectors in this sector of the system. In addition, a rapidly advancing frontal boundary has already moved off of the Carolina coast and will soon be merging with the leftover vort-max associated with Mindy. The accumulation of all this evidence indicates that Mindy no longer meets the definition of a tropical cyclone, and this will be the final advisory on the system. The post-tropical remains of Mindy have continued to accelerate to the east-northeast this evening at 070/25 kt, moving almost as quickly as the the maximum sustained winds, which is another reason why the circulation is likely no longer closed. This motion should continue for the next 12-24 hours with a gradual slowdown until what remains of the circulation becomes indistinguishable from the frontal boundary it is becoming embedded in. FORECAST POSITIONS AND MAX WINDS INIT 10/0300Z 32.5N 75.0W 30 KT 35 MPH...POST-TROP/EXTRATROP 12H 10/1200Z 33.2N 71.6W 25 KT 30 MPH...POST-TROP/EXTRATROP 24H 11/0000Z 34.1N 67.8W 25 KT 30 MPH...POST-TROP/EXTRATROP 36H 11/1200Z...DISSIPATED $$ Forecaster Papin

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