威海、烟台雪下到“冒烟”，咋回事？

Core Viewpoint - The article discusses the phenomenon of "cold flow snow" that frequently occurs in the coastal cities of Yantai and Weihai in Shandong Province, China, particularly during winter, highlighting its unique formation process and geographical significance [4][6]. Group 1: Formation of Cold Flow Snow - Cold flow snow, also known as "cold flow precipitation," forms when warm, moist air from the sea rises and cools, leading to snowflake formation as cold air moves southward [4]. - This type of snowfall is prevalent in coastal areas of the Yellow Sea and Bohai Sea, with Yantai and Weihai experiencing over 80% of their total snowfall days attributed to cold flow snow [4]. Group 2: Characteristics and Impact - Cold flow snow is characterized by its convective and localized nature, often resulting in significant snow accumulation [5]. - Yantai and Weihai are referred to as "China's snow nest" due to their unique coastal snow city landscape, with an average of approximately 39 days of cold flow snow per year [6]. Group 3: Geographical Influence - Weihai's geographical position, surrounded by the Yellow Sea on three sides, makes it particularly susceptible to cold flow snow, with notable snowfall events recorded, such as 80.3 millimeters in the Yantai Zhifu District from late 2005 to early 2006 [6]. - The large heat capacity of the ocean leads to a more stable winter sea temperature compared to land, facilitating conditions for air convection and snow formation when cold air interacts with warmer sea water [6][7].