On January 18, the Japan Weather Association released its spring 2024 pollen (cedar and cypress, and birch in Hokkaido) dispersal forecast by nation and prefecture.
The cedar pollen season is expected to start on par with or earlier than usual, with scattering beginning in early February in Kyushu, Shikoku, Chugoku, Tokai, and parts of the Kanto Koshin region. The Kinki region will be in mid-February, Hokuriku and southern Tohoku in mid to late February, and northern Tohoku in early to mid-March.
The temperatures this winter have been higher than normal, but there have been large differences in cold temperatures, and the cold spell in the latter half of December is thought to have advanced pollen dormancy to some extent. There will continue to be large differences in cold temperatures, with many cold days in late January, but temperatures in February will remain above normal. As a result, cedar blooms are expected to progress in February, and in early areas such as Fukuoka and Tokyo, cedar pollen is expected to start flying in early February.
The peak period for cedar pollen is expected to begin in late February in Fukuoka, Takamatsu, and Tokyo, and in early March in Hiroshima, Osaka, Nagoya, Kanazawa, and Sendai. The peak period is said to last from 10 days to a month. In addition, the peak of cypress pollen is from late March to early April in most places. In Sendai, the amount of cypress pollen dispersal is low, and no clear peak is expected to appear. However, if the weather suddenly warms up with strong winds, the amount of airborne pollen may increase at once and the peak period may be earlier than expected, so it is recommended to take all possible measures against pollen before the peak period.
Cedar, cypress, and birch pollen amounts in Hokkaido will be similar to or slightly higher than usual in most areas from Kyushu to Tohoku compared to the previous year. Hokkaido is expected to have very high amounts. Compared to the previous season (2023), amounts are expected to be lower than the previous season in most areas from Kyushu to the southern Tohoku region, but very high in the northern Tohoku and Hokkaido.
Compared to the previous season, the pollen dispersion trend in each region is expected to be 100% in Shikoku and Kanto Koshin, the same as in the previous season; 120-140% in Kyushu, Chugoku, Kinki, Tokai, Hokuriku, and Tohoku, slightly more; and 200% or more in Hokkaido, very much more. Compared to the previous season, Shikoku, Chugoku, Hokuriku, and Kanto Koshin are expected to have 50-60% fewer, Kyushu and Kinki 70% slightly fewer, and Tokai 90%, about the same as the previous season. Tohoku is expected to have as much as 150%, but there are large differences by region, with southern Tohoku expected to have little and northern Tohoku to have a very large number. Hokkaido is expected to have very high numbers at over 600%.
© Source travel watch
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