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 COLs variables(center coordinates, intensity, size, and background gradient) analyzed from JMA-GSM with methods based on Kasuga et al. (2021).
Analysis tools and details are available at https://gitlab.com/naos1/colindex.