An environmental synoptic analysis of tropical transitions in the central and Eastern North Atlantic

A tropical transition (TT) is the process whereby a baroclinic, high-to-moderate vertical wind shear, extratropical or subtropical cyclone transformed into warm-core, low cyclone. Thirty TT events were identified over central and eastern North Atlantic basin during period 1979–2019. The here studied from synoptic storm-centered composite climatology an environmental classification perspective. aim to study their common features highlight differences. analysis reveals that westerlies meridional trough with quasigeostrophic forcig acts as precursor. environments are characterized by at 300 hPa geopotential increase of 1000–500 thickness, i.e., system evolves strong anticyclone located north surface accompanied large latent heat release which promotes redistribution potential vorticity reduction 850–300 shear. TTs in predominantly developed warm sea temperatures (> 25 °C) low-to-moderate shear (10–15 m s?1). In contrast, transitioned temperature values (< high 15 Finally, statistically significant differences encouraged further via composites, revealing cyclones have more defined structure, while show characteristics.