More than 20 centimeters of snow blanketed parts of the capital city overnight, prompting heavy snow alerts in the greater Seoul area and Gangwon Province, the state weather agency said Wednesday. A heavy snow warning was issued in parts of northeastern Seoul, including Nowon, Seongbuk, and Dobong districts, shortly after the city experienced its first snow of the season, according to the Korea Meteorological Administration and the Seoul metropolitan government. An advisory is issued when snowfa