Due to the stagnant front, developed rain clouds continue to flow in northern Kyushu, and in Nagasaki and Kumamoto prefectures, the amount of rain that has fallen in the last two days is the highest in the history of observation.
During this time, it is raining heavily in Hokuriku and other areas, and the Japan Meteorological Agency is calling for strict caution against sediment-related disasters and river flooding.
Try to stay in a safe place as much as possible.
According to the Japan Meteorological Agency, rain clouds have developed in various parts of western and eastern Japan due to the active activity of fronts that are stagnant near Japan, and during this time, rain is intensifying in northern Kyushu, the Chugoku region, and the Tokai region.
During the hour until 4:00 am,
we observed heavy rain
of 33 mm in Yamaga City, Kumamoto Prefecture
, and 31 mm in Shimabara City, Nagasaki Prefecture
, all with rain gauges installed by the
prefecture
.
The amount of rainwater in the 48 hours up to 4:00 am
▽ Nagasaki Prefecture, 670 mm in Unzen
in ▽ Nagasaki Prefecture Shimabara 515.5 mm
▽ reached 451.5 mm in Kumamoto Prefecture Amakusa Hondo
any observation in history most often record-breaking heavy rain It has become.
The risk of sediment-related disasters has become extremely high due to the rain so far. There are areas that have been.
In Fukuoka, Kumamoto, Nagasaki, Saga, and Hiroshima prefectures, there are rivers that exceed the "flood risk water level" where the risk of flooding is extremely high.
The Japan Meteorological Agency has called for strict caution against sediment-related disasters, river flooding, and low land inundation, saying that "linear rain zones" continue to occur in Kyushu and the Chugoku region.
People in a safe place will continue to evacuate, and if the surrounding conditions deteriorate and it is dangerous to move to the evacuation site, move to a room on the second floor or higher and opposite the cliff or slope. Please spend even a little safe place.
Future forecast
It is a future outlook.
The front gradually moves northward, and it rains extremely heavily with lightning over the 14th, mainly in western Japan, and there is a risk of heavy rain in eastern and northern Japan.
The amount of rain that falls in 24 hours until the evening of the 13th is heavy in all places
▽ 300 mm in northern
Kyushu
▽
250 mm in southern Kyushu and Shikoku, Chugoku region
▽
200 mm in Kinki and Tokai, Kanto Koshin
▽ In Hokuriku and Tohoku It is
expected to be
120 mm
.
After that, in the 24 hours until the evening of the 14th,
▽ Northern and Southern Kyushu, Shikoku, Chugoku, Kinki, Tokai, and Kanto Koshin 200 mm to 300 mm
▽ Hokuriku 100 mm to 200 mm
▽ Tohoku 100 mm to 150
Expected to be
Milli
.
The front will be stagnant near Honshu for the next week or so, and moist air will continue to flow in, so even if the rain weakens once, it may intensify again, and the total rainfall is expected to increase over a wide area from western Japan to northern Japan.
Even in eastern and northern Japan, there is a risk of heavy rain leading to disasters such as the "end of the rainy season."
Before the danger is imminent, check the evacuation site and method by referring to the hazard map of the place where you live in advance, and check the rain cloud situation and the risk of sediment-related disasters in more detail than usual to be safe before the danger is imminent. Please move to a suitable place.
Front Why is it stagnant near Japan for so long?
According to the Japan Meteorological Agency, the fronts will continue to stagnate near Japan for the next week or so, and heavy rains may continue over a wide area from western Japan to northern Japan.
Why is the front line expected to stagnate for such a long time?
The point is "two high pressures in the north and south" across the Japanese archipelago.
There is a "Pacific High" on the south side of Japan.
Every year, it overhangs greatly in the summer and covers the archipelago, and the sunny and hot days continue, but now it stays near the sea in the south, and warm and moist air from the southwest side around the edge of the high pressure flows into the vicinity of Japan. ..
On the other hand, there is the "Okhotsk Sea High Pressure" in the north, and the cold and moist air toward the north is coming down.
A front occurs at the boundary between the two air, which is just near Japan.
Furthermore, because the westerlies that flow near Japan meander to the south than usual, it is expected that the Pacific High will not overhang near Honshu and the front will continue to stagnate near Japan for a long period of time.
Weather conditions very similar to the heavy rains in western Japan three years ago
Experts familiar with meteorological disasters said that a large amount of water vapor would flow toward the front for several days and heavy rains would be expected. Under favorable weather conditions, strict caution is required for sediment-related disasters and flooding of rivers. "
Assistant Professor Yoichi Kamae of the University of Tsukuba Life Environment Department analyzed the amount of water vapor observed by an artificial satellite at 6 am on the 12th.
As a result, it was found that a large amount of water vapor was flowing in a belt shape toward the front from the East China Sea and mainland China.
And, in the future, the inflow of water vapor will become stronger, and there is a possibility that the inflow of water vapor will continue for several days toward the stagnant front.
The situation where the fronts are stagnant for a long period of time and strong water vapor flows in is very similar to the heavy rains in western Japan three years ago, which caused enormous damage due to landslides and river floods over a wide area.
Assistant Professor Kamae said, "Heavy rain is expected in a wide range from western Japan to northern Japan, and it is safe to have heavy rain anywhere. Not only the linear rain zone that causes heavy rain in a short time, but also intermittent for several days. The risk of sediment-related disasters and river flooding is greatly increased by continued rain where the ground is loose due to heavy rain, so strict caution is required. "