In Berlin, the population was informed via Warnapp: " severe icy conditions" were to be expected throughout the city, especially on sidewalks. People were advised to refrain from avoidable outdoor activities. The Berlin fire department wrote on the online platform X, formerly Twitter, that the slippery roads were leading to a state of emergency and a high workload for the fire department. All available ambulances were in use. The fire department in Potsdam announced on X that there had been several traffic accidents in the state capital due to black ice.