The mudslide that affected San Carlos de Apoquindo, in the commune of Las Condes, last Thursday has once again brought to the fore the discussion about the need to incorporate weather radars in Chile, a technology that would improve the monitoring of intense rainfall and rapidly evolving storms. Following the emergency, the mayor of Las Condes, Catalina San Martín, raised the need to invest in these instruments. In parallel, the Undersecretary of the Interior, Máximo Pavez, stated that the Executive is evaluating formulas to move forward with their acquisition and installation, although he warned that it is a high-cost investment. The difficulties in anticipating the specific impact of the phenomenon were also reflected in the statements of the director of the National Service for Disaster Prevention and Response (Senapred), Alicia Cebrián. "There was no time to anticipate such a condition, even though this frontal system was being monitored and the public was being informed well in advance," she said. What they are, how they work, and why they are relevant for the country Weather radars are instruments that allow the detection and tracking of precipitation through the emission of electromagnetic waves that interact with raindrops, ice particles, and other elements present in the atmosphere. From the signals that return to the equipment, it is possible to estimate where precipitation is occurring, its intensity, and how it is moving. Their main advantage is that they allow the observation of localized phenomena that can be difficult to identify with sufficient precision using conventional weather models. The meteorologist from the Meteorological Directorate of Chile, Arnaldo Zúñiga, explained to La Tercera that this technology is especially useful against tornadoes, waterspouts, and convective clouds, which are capable of producing thunderstorms and intense precipitation over short periods. According to the specialist, although the available models make it possible to identify the areas where these phenomena could develop, determining their exact location remains complex. "Pinpointing where, within a commune, with the technology we currently have is difficult," he said. Weather radars: what they are and how they could help anticipate phenomena like the mudslide in Las Condes X @invapargentina The problem takes on special relevance, he says, in mountainous areas, where the network of weather observation stations has coverage limitations. In that scenario, radars would allow gaining time against the approach of intense storms. "They can help with prevention, even if only by minutes," explained Zúñiga, who noted that, depending on the trajectory of the clouds, these instruments could provide up to approximately half an hour of advance notice to identify the areas where intense precipitation could occur. The meteorologist added that Chile has tools to detect thunderstorms, but these do not necessarily reveal the amount of water the clouds carry. Radars, on the other hand, would provide that information and would allow better tracking of potentially dangerous weather phenomena. An idea that is not new Zúñiga recalled that following the tornadoes that affected the Biobío region in 2019, which left one person dead in Talcahuano, the then government of Sebastián Piñera commissioned a study to evaluate the installation of a national radar network. The proposal at that time contemplated eight fixed units and the possibility of incorporating two more mobile ones, using C-band and dual polarization technology. According to estimates at that time, each unit had an approximate value of 3 million dollars, considering only the instrument itself. The project studied in 2019 never came to fruition. Zúñiga explained that the initiative remained at a preliminary stage and that other resources subsequently had to be prioritized, in a context marked by the social unrest and the pandemic. Currently, the meteorologist explained, the feasibility of incorporating new monitoring tools is being analyzed, possibly through mobile radars as a first stage, before moving toward a system with greater coverage. Weather radars: what they are and how they could help anticipate phenomena like the mudslide in Las Condes X @Inumet_