Supercooled Fog, Ice Fog and Snowfall on a Calm and Cold Day in Asahikawa

Abstract

The observations at the city and the suburbs of Asahikawa disclosed the areal distributions of supercooled dense fog and ice fog. At the central part of the city a supercooled dense fog seemed to be converted to an ice fog by artificial ice nuclei even at -14--17°C, when in the suburbs sometimes stable supercooled fog was observed at -26°C. It was also confirmed that ice crystals near the vapor sources grew sometimes so large that they might be called snow crystals.