气象部门回应北京鹅毛大雪：回流降雪

Core Viewpoint - The recent heavy snowfall in Beijing is attributed to a typical "return flow snowfall" phenomenon influenced by easterly winds, which enhances precipitation in the western mountainous areas of the city [1] Group 1: Meteorological Factors - The snowfall is characterized as a typical return flow snowfall in North China, relying on easterly winds [1] - The topography of Beijing's western mountainous areas traps the easterly winds and moisture, intensifying the uplift in lower layers, leading to greater snowfall [1] - The cold air from the Bohai Bay, combined with the easterly winds, brings abundant moisture to Beijing, resulting in the formation of snow clouds [1] Group 2: Snow Characteristics - The temperature of the cloud layer during the snowfall ranged from -10°C to -20°C, which is conducive to the rapid growth of snowflakes [1] - The collision and adhesion of snowflakes during their descent contribute to the formation of large, visually appealing snowflakes or snow clumps, creating the "goose feather snow" effect [1] - The fluffy structure of the snowflakes often results in a deeper accumulation of snow on the ground [1]