South Korea issues warning as yellow snow falls Mon Mar 13, 7:49 AM ET SEOUL (AFP) - South Koreans were advised to stay home or wear masks outside as yellow sand mixed in snow fell across the western part of the Korean peninsula. The Korea Metrological Administration issued a rare health warning against a yellow snow storm in Seoul and nearby provinces. A yellow dust warning was issued in other regions. The Korean peninsula has been hit by yellow dust blowing in from northern China every spring but a yellow snow storm is rare.