DATA OWNER: MeteoSwiss and Laboratoire de Télédétection Environnementale, EPFL This dataset is linked to the research article: Feldmann et al., 2021, A Characterisation of Alpine Mesocyclone Occurrence, submitted to Weather and Climate Dynamics. Whenever using the dataset, please include a reference to this article. CONTENTS OF DATASET: Full tracks of all thunderstorms 2016-2020 that contained a mesocyclone in the Swiss radar domain VARIABLE DEFINITIONS MESOCYCLONE DATASET ID - Thunderstorm ID, unique to each storm year - year in YYYY day_of_year - number of day in the year in DDD time_of_day - UTC time of day in HHMM or HMM chx - Swiss X coordinate of thunderstorm centroid [m] chy - Swiss Y coordinate of thunderstorm centroid [m] area - area of thunderstorm [km^2] max_altitude - maximum altitude of terrain below thunderstorm [m] mean_altitude - mean altitude of terrain below thunderstorm [m] median_altitude - median altitude of terrain below thunderstorm [m] IQR_altitude - Interquartile range of altitude of terrain below thunderstorm [m] min_altitude - minimum altitude of terrain below thunderstorm [m] quality_index - quality index at thunderstorm centroid [] direction - direction of thunderstorm since last detection [°] direction_smoothed - direction of thunderstorm since last 3 detections [°] delta_altitude - altitude difference since last detection [m] distance - distance since last detection [km] positive_rotation - presence of anticyclonic rotation p_r_max - maximum rotational velocity [m s^-1] p_v_max - maximum vorticity [s^-1] p_area - area of rotation (sum over all elevations) [km^2] p_chx - Swiss X coordinate of rotation centroid [m] p_chy - Swiss Y coordinate of rotation centroid [m] p_range - range from detecting radar [km] p_dz - vertical extent of rotation [m] p_r_min - minimum rotational velocity [m s^-1] p_r_med - median rotational velocity [m s^-1] p_r_mean - mean rotational velocity [m s^-1] p_r_std - standard deviation of rotational velocity [m s^-1] p_v_min - minimum vorticity [s^-1] p_v_med - median vorticity [s^-1] p_v_mean - mean vorticity [s^-1] p_v_std - standard deviation of vorticity [s^-1] p_radar - detecting radar: 1-Albis, 2-La Dôle, 3-Monte Lema, 4-Pointe de la Plaine Morte, 5-Weissfluhgipfel negative_rotation - presence of cyclonic rotation; variable definitions see positive rotation n_r_max n_v_max n_area n_chx n_chy n_range n_dz n_r_min n_r_med n_r_mean n_r_std n_v_min n_v_med n_v_mean n_v_std n_radar