Video S1: Animation of radar reflectivity (dBz) observed by the Desio and Flero radars, and surface weather station data of ARPA Lombardia between 0000 UTC on 24 Jul. 2023 and 1000 UTC on 25 Jul. 2023. Temperature (black numbers), dew point temperature (red numbers), and wind (half barb 3 m/s, full barb 5 m/s) are plotted. The plotted domain is slightly smaller than that of Fig. 1b (because the radar coverage is smaller). Urban
areas (LU Index higher than 50) are highlighted with grey contours. One image every 10 minutes is shown.

Video S2: radar reflectivity simulated by the GLOBUS run between 0000 UTC and 0500 UTC on 25 Jul. 2023. The plotted domain is the same of Video S1.
