“Pollen halo” in central Tokyo Sign of mass scattering Cedar pollen peak widely How much longer will it fly? (Weather forecaster Rika Fukutomi March 10, 2024) – Japan Weather Association tenki.jp
“Pollen halo” in central Tokyo Sign of mass scattering Cedar pollen peaks widely How much longer will it fly?
March 10, 2024 13:35
Cedar pollen is at its peak in a wide area from western Japan to eastern Japan, and there are places in Kyushu and Kanto where cypress pollen is scattered. Today, the 10th (Sunday), a “pollen halo” appears in central Tokyo, a sign of a large amount of pollen being scattered. This week, except for the day when it rains on the 12th (Tuesday), it is widely expected to be “very heavy”. What is the proportion of dispersed pollen relative to the expected maximum value?
A week of essential pollen countermeasures
Today, the 10th (Sunday), Kyushu and Kanto are sunny, the air is dry, and there is a lot of pollen flying around. In central Tokyo, a “pollen halo” has appeared, a sign of a large amount of pollen being scattered. A “pollen halo” is a phenomenon in which a rainbow-like ring of light forms around the sun when a large amount of pollen is flying around. It occurs when pollen in the atmosphere bends sunlight.
This week, except for the 12th (Tuesday), when it rains nationwide, pollen will be “extremely high” in many places. Especially on sunny days after rain, strong winds, and dry air, a large amount of pollen will fly around, so be sure to take precautions.
After the rain on the 12th (Tuesday), the temperature will rise day by day, and from the 15th (Friday), the maximum temperature is expected to rise to around 20℃ in the Kanto region and west. As the weather warms up in spring, a large amount of pollen is expected to be scattered. Do not attach, inhale, or bring in pollen. Not only when you go out, but also before you open the front door of your house, take precautions such as brushing the pollen thoroughly to remove pollen.
Peak prediction of cedar and cypress pollen
Cedar pollen is at its peak in a wide area, but in mid-March, cypress pollen will reach its peak in Kyushu. Even in Tokyo, cypress pollen has been confirmed to be scattered in the Tama area since late February. The peak of cypress pollen is likely to be from late March to early April. In Sendai, the amount of cypress pollen scattered is small, and no clear peak is expected to appear.
How far did it fly?
In Tokyo, cedar pollen began to scatter on Friday, February 9th. The observation was 6 days earlier than the past 10-year average (February 15) and one day earlier than last year (February 10). It’s been a month since cedar pollen started scattering, but how far has it flown?
According to Tokyo Allergy Information Navi., the ratio of the number of pollen dispersed to the expected maximum value (cedar and cypress) is 50% in Ome and 65% in Tachikawa, although in some places in the Tama area more than half has already been dispersed. In central Tokyo, such as 22% in Chiyoda Ward, the rate is around 20% (observation period: until March 4th, and in the Tama area until March 7th).
Cedar pollen peaks from mid-March to late March, and cypress pollen peaks from late March to early April, so you’ll need to be a little more patient.
When is the most pollen in the air?
The time of day when pollen is most abundant varies depending on the weather conditions of the day, but in urban areas, pollen is generally said to be most abundant around noon and after sunset.
This is because the male flowers open early in the morning at sunrise, and the released pollen is carried by the wind and arrives in urban areas around noon.The pollen that flies high into the sky during the day then reaches the ground at sunset. It is thought that this is because they come down nearby.
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2024-03-10 04:35:44
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