HOKKAIDO - Northern Japan experienced record-breaking cold on the morning of November 11th, with temperatures plunging to minus 20.2 degrees Celsius in Horokanai, Hokkaido, marking the first time in Japan's recorded history that temperatures have fallen below minus 20 degrees during the first half of November.
The unusually severe cold was caused by a combination of cold air in the upper atmosphere and strong radiative cooling overnight, which allowed heat to escape from the ground under clear skies, sending temperatures sharply lower across northern Japan.
In Horokanai, the extreme conditions also produced a rare atmospheric phenomenon known as "diamond dust," in which water vapor freezes into tiny ice crystals suspended in the air, reflecting sunlight and creating a sparkling effect.
The reading of minus 20.2 degrees Celsius was particularly remarkable for the time of year, setting a nationwide record for the first half of November and highlighting the intensity of the early winter cold gripping northern Japan.
Source: TBS













