In Kyushu, there are areas where the risk of sediment-related disasters is increasing due to extremely heavy rains due to active front lines.
The front will stagnate near Japan over the next week, with more rainfall in western Japan and heavy rainfall in eastern and northern Japan.
Even in areas where it is not raining now, please check the evacuation site and method in advance and take early measures.
It is a weather commentary of Yuumi Hirano weather forecaster.
"Especially this time, it is a typical heavy rain pattern. Tomorrow (12th), the moist wind toward the front and the moist air around the edge of the high pressure collide near Kyushu, and it is easy to develop like a series of Nanun. Become."
"Moreover, from tomorrow (12th) to tomorrow (13th), the front will move north and the range of heavy rain is likely to expand. Furthermore, it will be stagnant over Saturday, and heavy rain is expected to continue in similar places."
The front line will continue to stagnate over the next week
The Japan Meteorological Agency met on the 11th and showed the outlook for the next week.
As the front line will continue to stagnate over the next week, he called for caution, saying, "There is a risk of heavy rain like the end of the rainy season, so please be prepared for disasters in advance."
Atmospheric instability Long-term heavy rain
According to the Japan Meteorological Agency, the front that currently extends from the continent to the vicinity of Kyushu is expected to gradually extend to the east of Japan and stagnate near Japan over the next week.
As a result, warm, moist air will flow toward the front and the atmospheric conditions will become unstable.
▽ In western Japan, it may rain very heavily with lightning over the 13th of this Friday, and heavy rain may continue after that. ▽ In eastern and northern Japan, heavy rain may occur after the 13th.
Active frontal activity “Linear precipitation zone” may occur
In addition, it can rain heavily in a short period of time.
In the Sea of Japan, where the front is expected to stagnate, the sea surface temperature is close to 30 degrees Celsius, which is higher than normal.
As a result, the activity becomes active by colliding with the moist air flowing around the Pacific High, and it is easy for a "linear precipitation zone" to occur in the same place where extremely heavy rain continues.
The Japan Meteorological Agency is calling for caution, saying that although the rainy season has already ended in various places, heavy rains such as the so-called "end of the rainy season" may occur.
“Preparing for heavy rains that may cause disasters”
Kenji Kishimoto, chief forecaster of the Japan Meteorological Agency's Forecast Division, said, "In addition to the characteristics of long rains, if it rains very heavily near the front, a disaster may occur. The way it rains depends on the position and activity of the front. However, the situation near the front will continue over the next week, no matter where and when it rains. I want you to be prepared for heavy rain in advance and check the weather information more frequently than usual. "
Front stagnation in August Major damage in the past
In the past, the front line stagnated for several days in August, causing great damage.
Seven years ago, from August 15th to 20th, the front stagnated near Honshu, and rain clouds spread over a wide area from Kyushu to Tokai around it.
In many places, heavy rains continued for a long time, and in places where warm and moist air flowed toward the front, extremely heavy rains and heavy rains fell in a short time, causing sediment-related disasters and flooding of rivers. ..
By August 18, the first half of the period, ▽ 48-hour precipitation reached 341 mm in Fukuchiyama City, Kyoto Prefecture, and ▽ 48-hour precipitation reached 330.5 mm in Takayama City, Gifu Prefecture, August 1 of the average year. According to the Fire and Disaster Management Agency of the Ministry of Internal Affairs and Communications, five people have died because it rained nearly twice as much as a month.
In addition, from the night of August 19th to the dawn of August 20th, which is the latter half of the period, the rain suddenly increased in Hiroshima City, and a linear precipitation zone occurred in a very limited area.
According to the Fire and Disaster Management Agency of the Ministry of Internal Affairs and Communications, 77 people died, including disaster-related deaths, due to local heavy rains such as rain gauges installed by the prefecture reaching 207 mm for two hours.
The heavy rain caused by the stagnation of the front may cause localized heavy rain after a long period of rain, and the risk of disaster may increase sharply. Therefore, the Japan Meteorological Agency checks the latest weather information in more detail than usual. I am calling for you to do it.