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Is it still hot and cold comes on suddenly? 32 years have passed since La Niña last occurred.
The La Niña phenomenon is very likely to continue through the winter. The last winter in which the La Niña phenomenon occurred was the coldest in 32 years. This year it will be hot for a while, but it seems that the number of cold days will suddenly increase in late autumn.
Laninha phenomenon Will it happen during the winter?
When the Laninha phenomenon occurs, easterly winds in the equatorial Pacific region become stronger than normal, the layer of warm seawater blowing in the west becomes thicker, and turbulent clouds occur more actively in the waters near Indonesia. In contrast, in the eastern part, the outbreak of cold water is stronger than in normal times. Therefore, in the central to eastern part of the equatorial Pacific region, the sea surface temperature is lower than in normal times. When La Niña occurs, the temperature tends to be high in the summer near Japan. On the other hand, the temperature tends to be low in winter.
When did the last La Niña Winter 2017/2018 phenomenon occur?
This winter was a cold winter across the country. The temperature was low across the country due to the frequent influx of strong cold air around Japan, and especially in western Japan, it was the coldest winter in 32 years since the winter of 1985/86, when the average annual difference was -1.2 ° C and -2.1 ° C. Due to the frequent increase in the winter-type pressure distribution, the amount of snow on the side of the Sea of Japan was large, and we were affected for record heavy snowfall in Hokuriku and other areas. Furthermore, due to the influence of the low pressure from the southern shore, heavy snowfall has also occurred on the Pacific side of Kanto Koshin and Tohoku.
In addition, the Laninha phenomenon also occurred in the winter of 2010/2011, but this winter there is a contrast between the time when the winter-type pressure distribution continues for a long time and the temperature is low and the time when the influence cold air is weak and the temperature is high. It was clear nationally.
The number of cold days is likely to suddenly increase from late fall this year.
Also, I would like to pay attention to the forecast for this winter (cold season forecast announced by the Meteorological Agency) on the 25th of this month. tenki.jp will also inform you about the outlook for winter weather.
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