Extreme COL detection and tracking by COL map based on JMA-GSM analysis and forecasts

"Cutoff low" (COL) is a low-pressure system that develops between the middle (~5000 m altitude) and the upper troposphere (~10000 m altitude). It propagates holding cold air derived from polar air inside. The cold, heavy air moving over the upper troposphere destabilizes the atmosphere below, and often accompanies localized weather disasters such as tornadoes and quasi-linear convective systems.
The dataset provides the trajectories of COLs. The COLs were calculated using the method proposed by Kasuga et al. (2021). The calculations were performed based on JMA-GSM data.