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Cold wave advisories are in effect across most of South Korea as of Wednesday, October 27, 2026, with the Korea Meteorological Administration forecasting the coldest morning so far this fall. Morning lows are expected to dip below zero in inland areas, with temperatures dropping about 10 degrees Celsius from the previous day in parts of northeastern Gyeonggi Province and inland and mountainous Gangwon Province, according to the Korea Times and KBS World. Korean news outlets report the advisories are tied to chilly air sweeping in from the northwest, affecting much of the country.