English: Severe weather hit Italy in the first weekend of December 2020. The border between Austria and Italy has been closed. Widespread flooding has been recorded in Sicily, Campania and Abruzzo. In Emilia Romagna, the Panaro river is overflowing and the Italian Civil Protection has requested the activation of the Copernicus Emergency Management Service to produce delimitation maps of the flooded areas. In Veneto, four hundred and eleven interventions were carried out in a few hours, while in Venice, for the first time since it was completed, the MOSE system, the mobile dyke system built to protect Venice and its lagoon from high tides, went into operations. This image, acquired by one of the Copernicus Sentinel-1 satellites on 5 December 2020 at 16:59 UTC, is the first satellite image ever acquired showing the MOSE in operation at the Bocca di Porto di Chioggia and the Bocca di Porto di Lido. RADAR data obtained by the Copernicus Sentinel-1 satellites are not affected by the presence of clouds. They are therefore particularly useful for accurate monitoring of land and maritime structures with a frequency of one data every 6 days on average at the Equator.