In Ono City, Fukui Prefecture, the lowest temperature was minus 9.8 degrees Celsius, which was the coldest winter, and a phenomenon called "rime ice" was observed in which the moisture in the air freezes and adheres to trees.
According to the Meteorological Observatory, the area in Fukui Prefecture on the morning of the 21st was severely cooled due to the effect of the radiative cooling phenomenon, which deprives the surface of heat.
The lowest temperature on the morning of the 21st is
▽ minus 9.8 degrees in Ono city
▽ minus 5.1 degrees in Imajo, Minamiechizen town
▽ minus 3.5 degrees in Harue, Sakai city
, which is the highest in this winter at 3 of the 10 observation points in the prefecture. It became a severe cold.
In the Mana River, which flows through Ono City, the river fog that is seen when the water temperature of the river rises above the temperature was seen around 7 am.
In addition, a phenomenon called "rime ice", in which the moisture in the air freezes and adheres to the trees, was also seen, and the branches of the trees in the riverbank were densely covered with white ice.