Abstract
Abstract This study of extratropical transition of western North Pacific tropical cyclones (TCs) addresses the reintensification stage during which the TC remnants develop as an extratropical cyclone. The hypothesis examined here is that reintensification depends on the interaction between the midlatitude circulation contributions from mid- and upper-level dynamic processes, low-level thermal processes from the decaying TC, and upper-level outflow characteristics from the decaying TC. Reintensification occurs when the combination of the dynamic and thermodynamic processes define a region that is favorable for extratropical cyclone development. The midlatitude circulation contribution to reintensification is characterized by comparing a control forecast made with an atmosphere-only version of the Coupled Ocean–Atmosphere Mesoscale Prediction System with a simulation in which the TC has been removed (NOTC). The midlatitude contribution is favorable if a significant extratropical cyclone forms in the NOTC si...
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