Analysis by the Meteorological Research Institute of the Japan Meteorological Agency has shown that the frequency of "bursts" caused by the "linear precipitation zone" where developed cumulonimbus clouds flow in one after another has more than doubled in the last 45 years.
Especially in June and July, which are the rainy season, the number is quadrupled, and experts point out that we want you to pay close attention to the coming time and weather information.
Teruyuki Kato, director of the Typhoon and Disaster Meteorological Research Department of the Meteorological Research Institute of the Japan Meteorological Agency, used data on precipitation at approximately 1300 AMeDAS sites nationwide, and it rained from 1976 to 2020. I analyzed the changes in the direction.
When the amount of rainfall in 3 hours reaches 130 mm or more, it is defined as "burst", and when looking at the change in frequency for 45 years, it was 67.7 times in 2020, 2.2 times that of 31.5 times in 1976. It turned out that it had increased to.
By month, it tends to increase especially during the rainy season, which is about 3.9 times in June and 3.8 times in July.
The main reason is that the amount of water vapor from the sea is increasing due to the progress of global warming, so it is thought that heavy rainfall due to the "linear precipitation zone" where developed cumulonimbus clouds are connected one after another is increasing mainly in the rainy season. It is supposed to be done.
Teruyuki Kato, director of the Meteorological Research Institute, said, "We found that torrential rains that increase the risk of sediment-related disasters and floods have increased significantly. It can be said that it is increasing. I would like people to come in contact with daily weather information as something more familiar to them, and be careful during the rainy season. "