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Was that year of heavy snowfall in Hokkaido actually La Niña?
When the Laninha phenomenon occurs, it is said that there is a trend towards cold winters in Honshu, but there is no such trend in Hokkaido. Well, it doesn’t mean there is going to be a lot of snow, but the Laninha phenomenon happened in the year the record for heavy snowfall was born in Sapporo, Hakodate and Hokkaido.
Last time in Hakodate, the amount of snow was the highest ever! The snowfall record in Hokkaido was also updated!
In the winter of 2017-2018, when the La Niña phenomenon occurred for the last time, the amount of snow in the cold year (August of the previous year to July of the current year) exceeded 500 cm for the first time in the history of the stats, and it looks like it will be a problem for the snow dump. It was a heavy snowfall. Furthermore, the snowfall at Horokauchi in the Kamikawa region reached 324 cm on February 25, breaking the record for the entire Hokkaido region.
However, in Hakodate, the amount of snow was considerably higher than normal, but in other areas it was almost normal and in Sapporo it was considerably lower than normal. It was a year of heavy snowfall, there was not much snow in Hokkaido in general.
Even in Sapporo, snowfall number one is the La Niña year.
Even in Sapporo, heavy winter snowfalls at La Niña are not someone else’s business. The highest total snowfall in Sapporo’s cold year was 680 cm in the 1996 cold year (August 1995 to July 1996), but in fact, La Niña was occurring at that time as well. it is. In Hokkaido this winter, there was heavy snowfall and record snowstorm due to the effect of passing near Hokkaido, while the low pressure developed a lot in January 1996, and on the two days of the 8th and 9th, it was 59 cm in Sapporo and 59 cm in Otaru. Observed 89 cm of snowfall. On the 9th, the transportation network was paralyzed in central areas such as the city of Sapporo and the city of Otaru, and a disaster dispatch request was even made to the Self-Defense Forces.
However, this winter also, even on the Sea of Japan side, which is the same as Sapporo and Otaru, there was a big difference in the amount of snow depending on the region, as Asahikawa has the same amount of snow as normal. and Wakauchi has less snow than normal.
Local heavy snowfall Due to meandering west wind and low pressure?
Even when the last La Niña occurred, the west wind snaked southward than usual, making it easier for strong cold air to flow toward Honshu instead of Hokkaido. As a result, the winter-type pressure distribution near Hokkaido has weakened compared to the average year, and there are many cases where low pressure passes or remains near Hokkaido. Compared to winter-type snow pressure distribution, low-pressure snow often causes more snowfall in a shorter period of time, and the range is generally narrower, so the locality tends to increase. Therefore, it is believed that there will be many cases of heavy snowfall and heavy snowfall at the point points, even if the amount of snow is almost equal to normal or less than normal.
The La Niña phenomenon is very likely to continue into winter, and Hokkaido is expected to be more susceptible to low pressure than usual because it is less likely to have a winter-like pressure distribution. Heavy local snowfall can also occur in Hokkaido this winter. It will be necessary to check the daily weather information and prepare for the snow.
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