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Tropical Storm Dolly Forecast Discussion Number 6
2020-06-23 22:33:42| National Hurricane Center (Atlantic)
Issued at 500 PM AST Tue Jun 23 2020 000 WTNT44 KNHC 232033 TCDAT4 Tropical Storm Dolly Discussion Number 6 NWS National Hurricane Center Miami FL AL042020 500 PM AST Tue Jun 23 2020 Dolly's structure has continued to improve somewhat during the day with convective banding now extending around the eastern and northern side of the circulation. While water vapor imagery indicates that an upper-level low is still in the vicinity of Dolly, that feature is displaced from the cyclone a bit, with some anticyclonic outflow noted in the cirrus canopy. This structure further supports the analysis of Dolly's transition to a tropical storm. For intensity, there is a wide range among satellite estimates, with TAFB and SAB ranging from 25-35 kt and UW-CIMSS ADT and SATCON estimates between 45-50 kt. The initial intensity will remain 40 kt on this advisory, matching what was shown by the earlier scatterometer data. Dolly continues to move east-northeastward with an initial motion of 060/10 kt. Strengthening mid-latitude southwesterly flow is expected to cause Dolly to turn northeastward and begin accelerating tonight into Wednesday, and the track guidance is in good agreement on the future path and speed of the storm. Dolly's future track will take it over much colder waters and into a higher-shear environment over the next day or so, which should cause the cyclone to degenerate into a remnant low on Wednesday. Dissipation is still shown at 48 hours, but global models fields indicate that the circulation could open up before then as the system nears the southeastern tip of Newfoundland. FORECAST POSITIONS AND MAX WINDS INIT 23/2100Z 40.1N 61.1W 40 KT 45 MPH 12H 24/0600Z 41.2N 59.4W 35 KT 40 MPH 24H 24/1800Z 43.1N 56.9W 30 KT 35 MPH...POST-TROP/REMNT LOW 36H 25/0600Z 45.0N 53.8W 25 KT 30 MPH...POST-TROP/REMNT LOW 48H 25/1800Z...DISSIPATED $$ Forecaster Berg
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