Cloud velocity dispersion as a function of effective radius. The clouds are selected from the snapshot spaced at 10 Myr intervals to avoid duplicate counts and eliminate bias toward the long-lived clouds. The points in the top panel are color-coded by their virial parameters, while those in the bottom panel are color-coded by tidal strength λ_tid. Clouds in stronger tidal environments typically have larger velocity dispersions and virial parameters. The red line represents the observations of MW clouds by Solomon et al. (1987), and the red-shaded region represents the observed 0.22 dex dispersion of log₁₀σ_v. The gray line and shaded region represent our best-fitting relation and the log₁₀σ_v dispersion of 0.31 dex. Our sample fitting closely follows the observations, although the scatter in the sample is slightly larger than that of the observed MW clouds, due to a rather tolerant selection criterion designed to include dynamically diverse clouds.