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03/21/2021 5:34 PM Weathernews
Posted at 3:43 PM, Memuro-cho, Hokkaido
In Hokkaido, on March 21 (Sunday) today, hot air began to flow as the low-pressure system moved north, and many places where snow that had fallen turned into rain.
However, in the inland area of eastern Hokkaido, there was a place where something similar to hail called “ice granules” fell due to the accumulation of cold air near the surface of the earth. Users of the Weathernews app have reported freezing rain.
In eastern Hokkaido, cold air was stored in the lower atmosphere, so even after hot air began to enter the sky, the earth’s surface temperature remained low.
Atmospheres at altitudes below 10,000 meters generally cool as they move higher in the sky. Some of this was reversed today, with temperatures below the coldest 1500 meters on the ground. This is a phenomenon called the inversion layer.
Therefore, it seems that the snow that fell from the sky melted in the middle and turned into rain, followed by the freezing process again near the surface of the earth, and ice particles fell as hail called “freezing rain”. The snow has a whitish appearance, but the ice granules are characterized by an almost transparent color.
However, depending on the conditions, such as the temperature at the moment, the water droplets can fall into a state of “supercooling” in which they do not freeze even at 0 ° C or below, and in that case, they can freeze in the moment they touch. an object on the ground. This phenomenon is called “ice shower”. When glazing occurs, tree branches and the like are coated with transparent ice.
Although it is a beautiful phenomenon, if rain and ice fall on the cables, it can easily cause power outages or the road surface to freeze and slide easily.
Be aware that these phenomena can occur in the process of turning snow into rain.
»Road Freeze Forecast (Members Only)
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