2022 Volume 84 Issue 1 Pages 3-11
The seagull-type crystal is a non-six-fold rotational symmetry type of snow crystal. Although the seagull-type crystals are commonly observed in the arctic areas of the cryosphere, we observed them at Fukiage onsen in Kami-Furano Town in March 2007. They were also observed at Wakkanai City in December 2020, which can be considered a rare event except for in the mountainous regions of Japan. At the time of observation, the temperature was －9.6 °Con the ground and －27.7 °Cat the top of the cloud (2106 m). The observed crystals may have formed in the lower troposphere due to the strong cold air over Wakkanai City.
