Exploring the Evolution of Typhoon Lekima (2019) Moving Offshore Northeast of Taiwan with a Multi-Resolution Global Model

Typhoon Lekima occurred in early August 2019 and moved northwestward toward Taiwan. During offshore passage, the typhoon underwent rapid intensification, with a northward deflected track, moving closer to northeastern A global model, MPAS, at multi-resolution of 60-15-3 km, is utilized ensemble forecasts investigate dynamic processes causing track deflection intensity change as well identify uncertainty initial perturbed conditions under topographic effects Central Mountain Range (CMR). For spinning up vortex forecasts, initialization has been enforced 3 km resolution targeted Taiwan area. As one specific member similar best significantly reduced absence terrain, highlighting role CMR. these tracks deflection, caused by induced strong flow east center response re-circulating around southern Taiwan, which produces wavenumber-one gyre asymmetric difference drive northward. The translation terrain dominated changing horizontal potential vorticity (PV) advection during forecasts. formation an intense PV tongue along upper eyewall facilitation precondition RI, while RI can be enhanced presence lower-stratospheric core near eye, produced radial inflow developed transverse circulation over upper-level outflow layer.