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🚗 | Highway closed, 12 routes, 14 sections — fear of heavy snow over 10 days

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Highway closed, 12 routes, 14 sections – fear of heavy snow over 10 days

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This pressure distribution will continue until around the 10th, and strong cold air is expected to flow into the sky.

From January 1th, the expressway will be closed due to heavy snow on the Sea of ​​Japan side on 7 routes and 4 sections within the NEXCO East Japan jurisdiction (... → Continue reading


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Pressure pattern

Pressure pattern(Kiatsu Haichi) OrBarometric pressure distribution(Kiakunpu) is on the earth(I.e.,(I.e.It refers to the positional relationship such as. Atmospheric pressure distributionIsobarWhat is expressed by the figure usingBarometric pressure layout(Kiatsu is Ichizu).


Surface weather mapas well as,Upper weather mapIn high and low pressure, etc.(I.e.,IsobarAnd so onweatherInformation about, i.e.Atmospheric disturbanceIt is shown. From thisWeather mapCan be interpreted as a distribution map of all atmospheric disturbances. For example, the distribution of this atmospheric disturbance to the west(I.e.,To the east(I.e.There is a situationWest High East LowIt is called the pressure distribution of or simply the winter type pressure distribution. In this way, the atmospheric pressure distribution is a term used when discussing positional relationships such as low pressure and high pressure.

Example of typical pressure distribution near Japan

Since the isobars are in the vicinity of Japan with high pressure in the west and low pressure in the east, the northwest wind and cold air flow in, causing snow or rain on the Sea of ​​Japan side and fine weather on the Pacific side. It is subdivided into a "satoyuki type" where the isobars bend in a dogleg shape near the Sea of ​​Japan and a "mountain snow type" where the isobars are parallel near Japan. Strictly speaking, small-scale, short-term west high and east low are not called "winter-type pressure distribution".
  • (Midsummer type, whale tail type)
The area around Japan is covered with the Pacific High, which basically brings clear and moist weather.
The high pressure in the southwestern part of Japan covers the area around Japan widely, and the low pressure system is advancing in the northeastern part of Japan. Basically, the weather is recovering and brings fine weather. Often refers to summer-type pressure distribution.
Summer type pressure distribution. A type in which the Pacific High overhangs the sea east of Japan and the continental area becomes a low pressure part. It is the average pressure distribution in summer.
As the name suggests, there is an anticyclone on the north side of the point of interest, and the northeastern wind enters and brings cloudy and rainy weather.
There is the Pacific High in the southeast of Japan and the Okhotsk High in the northeast, and the Baiu front stagnates between them, causing long rains near the front and hot and humid sunny weather in the north and south of the front.
A low pressure system that occurred near Taiwan develops along the southern coast of Japan with cold air, causing strong winds and cloudy weather over a wide area, and heavy thunderstorms and heavy snow near low pressure systems and fronts. It is often seen from winter to spring.
Two low pressure systems occur side by side on the Sea of ​​Japan side and the Pacific Ocean side, causing strong winds, heavy rains, snowstorms, and heavy snowfalls over a wide area. The closer the two cyclones are, the worse the weather will be, and an occluded front may occur between the cyclones. It is often seen from winter to spring.
A low pressure system that occurred near China, the Yellow Sea, and the Korean Peninsula rapidly develops and travels eastward through the Sea of ​​Japan, becoming relatively warm and causing strong winds and heavy rain. In winter, it can be heavy snow. In the case of spring, in addition to the first gust of spring,MaystormIt may bring about stormy weather called. Since the wind blows toward the low pressure system in the Sea of ​​Japan, the temperature may rise in the area on the Sea of ​​Japan side due to the foehn phenomenon caused by the wind over the central mountains.


  • Takashi Nitta, edited by Weather Forecast Technology Study Group "Latest Weather Forecast Technology Revised Edition" published by Tokyodo Publishing Co., Ltd. 20009 ISBN 4490204132

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