After the release of the “heavy rain special warning” “Inundation occurrence information” October 18th at 18:09 on 8 rivers nationwide

A heavy rain special warning that the Japan Meteorological Agency calls for the highest alert.
During the heavy rain of Typhoon No.19, it was found that information on the occurrence of inundation was announced in 8 rivers such as Abukuma River and Chikuma River after the heavy rain special warning was released. The expert said, “There may be an illusion that the crisis has passed due to the release of the special warning, and verification is necessary.”

Due to the heavy rain caused by typhoon No. 19, the Japan Meteorological Agency announced a special heavy rain warning to 13 prefectures in total, and in collaboration with the Ministry of Land, Infrastructure, Transport and Tourism, etc., "inundation occurrence information" was also sent to 16 rivers flowing through these prefectures. Announced one after another.

When NHK researched, half of these eight rivers were found to have newly inundated information not only during the heavy rain special warning announcement but also after the special warning was released.

The eight rivers are the Yoshida River in Miyagi Prefecture, the Abukuma River upstream in Fukushima Prefecture, the Ishida River in Gunma Prefecture, the Snake River in Tochigi Prefecture, the Kuji River in Ibaraki Prefecture, the Miyako River in Saitama Prefecture, the Koshibe River in Saitama Prefecture, and the Nagano Prefecture In Chikuma River, the time difference from the special alarm release was the largest at 9 hours and 20 minutes upstream of Abukuma River, followed by Tokugawa and Koshibe River after 8 hours and 20 minutes, and Yoshida River after about 4 hours.

Special warnings include special warnings for “heavy rain” targeting sediment-related disasters and inundation damage, but there is no special warning for “flooding”, and the risk of large rivers depends on the water level and rainfall in the basin. “Inundation risk information” and “Inundation occurrence information” are announced.

In the NHK interview, several people have been found to have returned to their homes following the cancellation of the special heavy rain warning, and have subsequently been inundated by river flooding.

Professor Hiromura Kimura, a professor at Hyogo Prefectural University, who is familiar with disaster prevention information, “There was a possibility that there were many residents who had the illusion that the heavy rain special warning had been lifted and the crisis had passed, and verification is necessary. For people living near the river, `` It is important to know that the water level will rise over time even if it stops raining, check the information about the water level and evacuation advice, etc., and continue to take actions to save lives if there is a danger. '' Pointed out.

The time when “inundation occurrence information” of 8 rivers appeared

▽ Yoshida River in Miyagi Prefecture is 6:25 am and 8:40 am, after the heavy rain special warning was canceled at 13:05 am And at 9:40 am, flooding information was issued one after another.

▽ At the upstream of the Abukuma River in Fukushima Prefecture, after the heavy rain special warning was canceled at 4 am on the 13th, the new inundation occurred, at 6:30 am, 10:20 am, and 1:20 pm Inundation information was issued. The last flood information was issued 9 hours and 20 minutes after the special warning was released.

▽ The Ishida River in Gunma Prefecture's Tone River water system was canceled at 0:10 am on the 13th, and flooding information was issued at 0:20 am just 10 minutes later.

▽ The heavy rain special warning was canceled at 2:20 am on the 13th of the Serpent River in Tochigi Prefecture, and flooding information was issued at 4:25 am, two hours later.

▽ In Kuji River, Ibaraki Prefecture, the heavy rain special warning was canceled at 2:20 am on the 13th, and flooding information was issued at 5:20 am three hours later.

▽ The heavy rain special warning was canceled at 0:40 am on the 13th in the Iruma River basin in Saitama Prefecture, and flooding information was issued at 9:00 am, 8 hours later.

▽ In Chikuma River in Nagano Prefecture, the heavy rain special warning was canceled at 3:20 am on the 13th, and flooding information was issued at 3:25 am just 5 minutes later.

Of the 8 rivers, the Yoshida River, the Abukuma River upstream, the Tokugawa River, and the Chikuma River have inundation occurrence information before the heavy rain special warning is canceled. And the breakup of the dike were confirmed one after another.