Just quickly gathered information about flooding in Japan for you! Hope it will be helpful to you (and your family & friends). Stay safe!
XRAIN [English Trial Version] by MLIT (Ministry of Land, Infrastructure, Transport and Tourism) Japan [in English]
You can check the following information for a selected river on a map:
*Alert for flooding.
*Pop-up interactive water level chart.
*Hydrograph.
*Monitoring webcam.
XRAIN: eXtended RAdar Information Network (hight performance rader rain gauge network) delivers rainfall information of high resolution and high frequency in pseudo-realtime on a map.
Check "How to use" on the menu for the details.
River Disaster Prevention Information Portal [in Japanese]
By MLIT (Ministry of Land, Infrastructure, Transport and Tourism) Japan
全国(Nationwide), 北海道(Hokkaido), 東北(Tohoku Region), 関東(Kanto Region), 北陸(Hokuriku Region), 中部(Chubu Region), 近畿(Kinki Region), 中国(Chugoku Region), 四国(Shikoku Region), 九州(Kyushu Region), 沖縄(Okinawa Region),
雨の降っている地域（XRAIN）(Raining area(XRAIN))
気象警報・注意報(Weather Warnings・Advisories)
河川カメラ(→全国のカメラへ)(River webcam (->Nationwide webcams))
川の水位情報(River water level information)
浸水の危険性が高まっている河川(A list of river flood warnings)
洪水予報の発表地域(Flood forecast areas)
洪水貯留操作を実施しているダムがある地域(Areas with flood control dams, currently adjusting the water level)
洪水警報の危険度分布(Flood risk distribution map)
土砂災害危険度分布(Sediment disaster risk distribution map)
水害リスクライン(Flood risk line)
避難情報(Evacuation information)
被害情報(Damage information)
When the information on the above site is unavailable (busy or overloaded), they recommended to visit the following sites as alternative resources.
NHK あなたの天気・防災（データマップ）
NHK Your Weather・Disaster Prevention (Data Map) [in Japanese]
https://www.nhk.or.jp/kishou-saigai/datamap/?zoom=5
*Select data and area and adjust the map.
*Top right drop-down lists: [データマップ表示切替(Data Map Type)] [地名から探す(Search by Area Name(※Select a prefecture))]
*Flooding related Data Map Type: 河川情報・大河川(River Information・Large Rivers)
NHK NEWS WEB Your Weather・Disaster Prevention [in Japanese]
https://www.nhk.or.jp/kishou-saigai/area-setting/
*First, you must set your area. In 地域の設定(Area setting), under [地域から探す(Search by Area)], select エリア(Region), 都道府県(Prefecture) and 地域名(Area Name), or [郵便番号から探す(Search by Zip|Post Code)], enter a Zip|Post code. After finding a area, Click or tap [設定する(Set)] to confirm and add the area.
Yahoo! 天気・災害 河川水位
Yahoo! Weather・Disaster River Water Level [in Japanese]
https://typhoon.yahoo.co.jp/weather/river/
*Select a river on the map.
*River Flooding Colours: 発表無し(No warning: light blue) 注意(Advisory: yellow) 警戒(Warning: orange) 危険(Danger: red) 氾濫発生(Flooding occurred: purple)
XRAIN [English Trial Version] by MLIT (Ministry of Land, Infrastructure, Transport and Tourism) Japan [in English]
You can check the following information for a selected river on a map:
*Alert for flooding.
*Pop-up interactive water level chart.
*Hydrograph.
*Monitoring webcam.
XRAIN: eXtended RAdar Information Network (hight performance rader rain gauge network) delivers rainfall information of high resolution and high frequency in pseudo-realtime on a map.
Check "How to use" on the menu for the details.
River Disaster Prevention Information Portal [in Japanese]
By MLIT (Ministry of Land, Infrastructure, Transport and Tourism) Japan
全国(Nationwide), 北海道(Hokkaido), 東北(Tohoku Region), 関東(Kanto Region), 北陸(Hokuriku Region), 中部(Chubu Region), 近畿(Kinki Region), 中国(Chugoku Region), 四国(Shikoku Region), 九州(Kyushu Region), 沖縄(Okinawa Region),
雨の降っている地域（XRAIN）(Raining area(XRAIN))
気象警報・注意報(Weather Warnings・Advisories)
河川カメラ(→全国のカメラへ)(River webcam (->Nationwide webcams))
川の水位情報(River water level information)
浸水の危険性が高まっている河川(A list of river flood warnings)
洪水予報の発表地域(Flood forecast areas)
洪水貯留操作を実施しているダムがある地域(Areas with flood control dams, currently adjusting the water level)
洪水警報の危険度分布(Flood risk distribution map)
土砂災害危険度分布(Sediment disaster risk distribution map)
水害リスクライン(Flood risk line)
避難情報(Evacuation information)
被害情報(Damage information)
When the information on the above site is unavailable (busy or overloaded), they recommended to visit the following sites as alternative resources.
NHK あなたの天気・防災（データマップ）
NHK Your Weather・Disaster Prevention (Data Map) [in Japanese]
https://www.nhk.or.jp/kishou-saigai/datamap/?zoom=5
*Select data and area and adjust the map.
*Top right drop-down lists: [データマップ表示切替(Data Map Type)] [地名から探す(Search by Area Name(※Select a prefecture))]
*Flooding related Data Map Type: 河川情報・大河川(River Information・Large Rivers)
NHK NEWS WEB Your Weather・Disaster Prevention [in Japanese]
https://www.nhk.or.jp/kishou-saigai/area-setting/
*First, you must set your area. In 地域の設定(Area setting), under [地域から探す(Search by Area)], select エリア(Region), 都道府県(Prefecture) and 地域名(Area Name), or [郵便番号から探す(Search by Zip|Post Code)], enter a Zip|Post code. After finding a area, Click or tap [設定する(Set)] to confirm and add the area.
Yahoo! 天気・災害 河川水位
Yahoo! Weather・Disaster River Water Level [in Japanese]
https://typhoon.yahoo.co.jp/weather/river/
*Select a river on the map.
*River Flooding Colours: 発表無し(No warning: light blue) 注意(Advisory: yellow) 警戒(Warning: orange) 危険(Danger: red) 氾濫発生(Flooding occurred: purple)
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