2023/12/05 11:12 Weather News
In 2024, cedar pollen is expected to begin scattering in parts of Kyushu, Tokai, and Kanto in late January. Although the amount of scattered water will be lower than in spring 2023 in a wide area excluding parts of northern Japan, it is expected that there will be many areas where the amount will be at or above normal compared to normal years (average for the past 10 years).
Warm winters accelerate the start of dispersal.
Due to the intermittent flow of cold air, dormancy is expected to be broken at a moderate rate, and the start of pollen dispersal in 2024 is expected to be earlier nationwide than the average for the past 10 years.
Cedar pollen is expected to begin scattering in parts of Kyushu, Tokai, and Kanto in late January, and to begin dispersing over a wide area in early February, mainly on the Pacific side of western and eastern Japan.
It is expected that dispersal will begin in Hokuriku and southern Tohoku in mid-February, and in northern Tohoku from late February to early March.
Cedar pollen begins to disperse in earnest from mid-February.
It is expected to occur from late February to late March in Hokuriku, Nagano and the southern Tohoku region, and from early March to mid-April in the northern Tohoku region. In early regions such as Kyushu, the scattering of cedar pollen gradually subsides in mid-March, while in western and eastern Japan, the scattering of cypress pollen increases.
It is expected that birch pollen will be in full swing in Hokkaido from late April to mid-May, which may coincide with Golden Week.
Amount of dispersal: Expected to be around normal to above normal nationwide
In Hokkaido, where the amount of air pollution in 2023 was at a record low, it is expected that the amount of air pollution in 2023 will be approximately six times that of 2023.
On the other hand, in western Japan and the Kanto region, where the amount of air pollution was high in 2023, the amount of air pollution is expected to decrease, and in some areas to be about half of what it was in 2023. The national average is expected to be 69% compared to 2023.
Compared to normal years (average scattering amount from 2014 to 2023), there are many areas from Kinki to Tohoku where the amount is slightly above normal, and there are many areas where the amount is slightly above normal in southern Kyushu and Chugoku/Shikoku.
In Hokkaido, the amount of scattered water is expected to be about twice that of a normal year. The national average is expected to be 128% of normal.
Conducted a survey of male cedar flowers
As a result of the male flower survey, the most common answer regarding male flower formation was “male flowers are formed all over the plant.” In addition, the number of respondents who said “Male flowers are formed all over the place and the density is high” was nearly three times higher than the number who answered “No male flowers were observed,” and there were areas where the amount of male flowers exceeded initial expectations.
In this presentation, taking into account the results of the male flower survey, we have partially updated the forecast of dispersal amount for 2024 from the previous announcement (announced on October 3).
*Users will send us photos of male cedar flowers, and we will ask them to choose from 4 options to determine the condition of the male flowers in the photo: male flowers all over the place and dense, male flowers all over the place, male flowers sparse. The answers were: Yes, no male flowers observed.
2023-12-05 02:12:00
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