2026-04-09T23:00:00Z 通常 気象庁本庁 気象庁 2026-04-10T08:00:00+09:00 2026-04-10T09:00:00+09:00 2026-04-11T03:00:00+09:00 350 発表 1 降灰予報 1.1_0 　現在、草津白根山（白根山（湯釜付近））は噴火警戒レベル２（火口周辺規制）です。草津白根山（白根山（湯釜付近））で噴火が発生した場合には、１０日０９時から１２時までは火口から北東方向、１０日２１時から２４時までは火口から東方向に降灰が予想されます。 降灰予報（定時） 06 草津白根山（白根山（湯釜付近）） 350 降灰 70 栃木県日光市 0920600 群馬県沼田市 1020600 群馬県中之条町 1042100 群馬県嬬恋村 1042500 群馬県草津町 1042600 群馬県高山村 1042800 群馬県片品村 1044300 群馬県川場村 1044400 群馬県みなかみ町 1044900 新潟県十日町市 1521000 新潟県魚沼市 1522500 新潟県南魚沼市 1522600 新潟県湯沢町 1546100 新潟県津南町 1548200 長野県高山村 2054300 長野県山ノ内町 2056100 長野県栄村 2060200 小さな噴石の落下 75 群馬県中之条町 1042100 群馬県嬬恋村 1042500 群馬県草津町 1042600 長野県高山村 2054300 降灰予報（定時） 06 草津白根山（白根山（湯釜付近）） 350 +3638.63+13831.67+2160/ 降灰 70 栃木県日光市 0920600 群馬県沼田市 1020600 群馬県中之条町 1042100 群馬県嬬恋村 1042500 群馬県草津町 1042600 群馬県高山村 1042800 群馬県片品村 1044300 群馬県川場村 1044400 群馬県みなかみ町 1044900 新潟県十日町市 1521000 新潟県魚沼市 1522500 新潟県南魚沼市 1522600 新潟県湯沢町 1546100 新潟県津南町 1548200 長野県高山村 2054300 長野県山ノ内町 2056100 長野県栄村 2060200 小さな噴石の落下 75 群馬県中之条町 1042100 群馬県嬬恋村 1042500 群馬県草津町 1042600 長野県高山村 2054300 2026-04-10T09:00:00+09:00 2026-04-10T12:00:00+09:00 降灰 70 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北東 70 群馬県中之条町 1042100 群馬県嬬恋村 1042500 群馬県草津町 1042600 群馬県みなかみ町 1044900 新潟県十日町市 1521000 新潟県魚沼市 1522500 新潟県南魚沼市 1522600 新潟県湯沢町 1546100 新潟県津南町 1548200 長野県高山村 2054300 長野県山ノ内町 2056100 長野県栄村 2060200 小さな噴石の落下 75 1 +36.6789+138.5400/+36.6791+138.5600/+36.6755+138.5800/+36.6600+138.5874/+36.6554+138.5800/+36.6400+138.5747/+36.6253+138.5600/+36.6212+138.5400/+36.6214+138.5200/+36.6400+138.5014/+36.6586+138.5200/+36.6600+138.5218/+36.6789+138.5400/ 東 5 群馬県中之条町 1042100 群馬県嬬恋村 1042500 群馬県草津町 1042600 長野県高山村 2054300 2026-04-10T12:00:00+09:00 2026-04-10T15:00:00+09:00 降灰 70 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北東 80 群馬県中之条町 1042100 群馬県嬬恋村 1042500 群馬県草津町 1042600 群馬県みなかみ町 1044900 新潟県十日町市 1521000 新潟県魚沼市 1522500 新潟県南魚沼市 1522600 新潟県湯沢町 1546100 新潟県津南町 1548200 長野県高山村 2054300 長野県山ノ内町 2056100 長野県栄村 2060200 小さな噴石の落下 75 1 +36.6839+138.5600/+36.6838+138.5800/+36.6800+138.5884/+36.6600+138.5895/+36.6505+138.5800/+36.6437+138.5600/+36.6400+138.5588/+36.6212+138.5400/+36.6215+138.5200/+36.6400+138.5014/+36.6585+138.5200/+36.6600+138.5212/+36.6792+138.5400/+36.6800+138.5554/+36.6839+138.5600/ 北東 6 群馬県中之条町 1042100 群馬県嬬恋村 1042500 群馬県草津町 1042600 長野県高山村 2054300 2026-04-10T15:00:00+09:00 2026-04-10T18:00:00+09:00 降灰 70 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北東 60 群馬県中之条町 1042100 群馬県嬬恋村 1042500 群馬県草津町 1042600 群馬県みなかみ町 1044900 新潟県南魚沼市 1522600 新潟県湯沢町 1546100 長野県高山村 2054300 長野県山ノ内町 2056100 長野県栄村 2060200 小さな噴石の落下 75 1 +36.6781+138.5400/+36.6798+138.5600/+36.6777+138.5800/+36.6600+138.5880/+36.6550+138.5800/+36.6400+138.5746/+36.6254+138.5600/+36.6212+138.5400/+36.6214+138.5200/+36.6400+138.5014/+36.6586+138.5200/+36.6600+138.5219/+36.6781+138.5400/ 東 5 群馬県中之条町 1042100 群馬県嬬恋村 1042500 群馬県草津町 1042600 長野県高山村 2054300 2026-04-10T18:00:00+09:00 2026-04-10T21:00:00+09:00 降灰 70 +36.7648+138.8200/+36.7661+138.8400/+36.7665+138.8600/+36.7662+138.8800/+36.7628+138.9000/+36.7600+138.9067/+36.7450+138.9200/+36.7400+138.9334/+36.7313+138.9400/+36.7200+138.9496/+36.7000+138.9565/+36.6968+138.9600/+36.6825+138.9800/+36.6800+138.9823/+36.6600+138.9817/+36.6400+138.9813/+36.6393+138.9800/+36.6217+138.9600/+36.6200+138.9584/+36.6133+138.9400/+36.6085+138.9200/+36.6039+138.9000/+36.6017+138.8800/+36.6007+138.8600/+36.6014+138.8400/+36.6001+138.8200/+36.6031+138.8000/+36.6046+138.7800/+36.6064+138.7600/+36.6099+138.7400/+36.6090+138.7200/+36.6104+138.7000/+36.6060+138.6800/+36.6038+138.6600/+36.6033+138.6400/+36.6029+138.6200/+36.6030+138.6000/+36.6053+138.5800/+36.6200+138.5618/+36.6200+138.5600/+36.6200+138.5400/+36.6207+138.5200/+36.6400+138.5007/+36.6600+138.5024/+36.6776+138.5200/+36.6799+138.5400/+36.6800+138.5600/+36.6800+138.5608/+36.6978+138.5800/+36.6992+138.6000/+36.6998+138.6200/+36.7000+138.6218/+36.7147+138.6400/+36.7177+138.6600/+36.7192+138.6800/+36.7200+138.6860/+36.7297+138.7000/+36.7363+138.7200/+36.7380+138.7400/+36.7400+138.7520/+36.7444+138.7600/+36.7490+138.7800/+36.7551+138.8000/+36.7600+138.8134/+36.7648+138.8200/ 東 40 群馬県沼田市 1020600 群馬県中之条町 1042100 群馬県嬬恋村 1042500 群馬県草津町 1042600 群馬県高山村 1042800 群馬県みなかみ町 1044900 新潟県湯沢町 1546100 長野県高山村 2054300 長野県山ノ内町 2056100 小さな噴石の落下 75 1 +36.6728+138.5400/+36.6715+138.5600/+36.6657+138.5800/+36.6600+138.5894/+36.6400+138.5915/+36.6319+138.5800/+36.6246+138.5600/+36.6212+138.5400/+36.6214+138.5200/+36.6400+138.5014/+36.6586+138.5200/+36.6600+138.5272/+36.6728+138.5400/ 東 5 群馬県中之条町 1042100 群馬県嬬恋村 1042500 群馬県草津町 1042600 長野県高山村 2054300 2026-04-10T21:00:00+09:00 2026-04-11T00:00:00+09:00 降灰 70 +36.8247+139.3200/+36.8302+139.3400/+36.8310+139.3600/+36.8255+139.3800/+36.8200+139.3935/+36.8165+139.4000/+36.8068+139.4200/+36.8000+139.4314/+36.7949+139.4200/+36.7867+139.4000/+36.7800+139.3890/+36.7749+139.3800/+36.7648+139.3600/+36.7600+139.3440/+36.7587+139.3400/+36.7551+139.3200/+36.7504+139.3000/+36.7575+139.2800/+36.7600+139.2756/+36.7800+139.2755/+36.8000+139.2755/+36.8045+139.2800/+36.8193+139.3000/+36.8200+139.3025/+36.8247+139.3200/ 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東 80 栃木県日光市 0920600 群馬県沼田市 1020600 群馬県中之条町 1042100 群馬県嬬恋村 1042500 群馬県草津町 1042600 群馬県高山村 1042800 群馬県片品村 1044300 群馬県川場村 1044400 群馬県みなかみ町 1044900 長野県高山村 2054300 長野県山ノ内町 2056100 小さな噴石の落下 75 1 +36.6755+138.5600/+36.6685+138.5800/+36.6600+138.5928/+36.6462+138.5800/+36.6400+138.5786/+36.6236+138.5600/+36.6212+138.5400/+36.6400+138.5212/+36.6588+138.5400/+36.6600+138.5445/+36.6755+138.5600/ 東 5 群馬県中之条町 1042100 群馬県草津町 1042600 2026-04-11T00:00:00+09:00 2026-04-11T03:00:00+09:00 降灰 70 +36.8823+139.3400/+36.8826+139.3600/+36.8800+139.3713/+36.8773+139.3800/+36.8659+139.4000/+36.8600+139.4052/+36.8400+139.4011/+36.8391+139.4000/+36.8246+139.3800/+36.8200+139.3720/+36.8140+139.3600/+36.8091+139.3400/+36.8075+139.3200/+36.8052+139.3000/+36.8000+139.2906/+36.7955+139.2800/+36.7884+139.2600/+36.7845+139.2400/+36.7822+139.2200/+36.7800+139.2039/+36.7794+139.2000/+36.7683+139.1800/+36.7600+139.1700/+36.7517+139.1600/+36.7400+139.1489/+36.7343+139.1400/+36.7218+139.1200/+36.7200+139.1164/+36.7129+139.1000/+36.7000+139.0829/+36.6980+139.0800/+36.6830+139.0600/+36.6800+139.0572/+36.6617+139.0400/+36.6600+139.0375/+36.6512+139.0200/+36.6455+139.0000/+36.6457+138.9800/+36.6475+138.9600/+36.6562+138.9400/+36.6600+138.9288/+36.6608+138.9200/+36.6609+138.9000/+36.6601+138.8800/+36.6609+138.8600/+36.6608+138.8400/+36.6604+138.8200/+36.6600+138.8152/+36.6520+138.8000/+36.6497+138.7800/+36.6474+138.7600/+36.6426+138.7400/+36.6411+138.7200/+36.6404+138.7000/+36.6402+138.6800/+36.6400+138.6691/+36.6328+138.6600/+36.6222+138.6400/+36.6207+138.6200/+36.6202+138.6000/+36.6201+138.5800/+36.6201+138.5600/+36.6201+138.5400/+36.6214+138.5200/+36.6400+138.5014/+36.6600+138.5038/+36.6762+138.5200/+36.6798+138.5400/+36.6799+138.5600/+36.6799+138.5800/+36.6799+138.6000/+36.6800+138.6043/+36.6948+138.6200/+36.6989+138.6400/+36.6995+138.6600/+36.6996+138.6800/+36.7000+138.7000/+36.7000+138.7001/+36.7160+138.7200/+36.7181+138.7400/+36.7187+138.7600/+36.7191+138.7800/+36.7199+138.8000/+36.7200+138.8015/+36.7311+138.8200/+36.7346+138.8400/+36.7400+138.8501/+36.7500+138.8600/+36.7520+138.8800/+36.7518+138.9000/+36.7490+138.9200/+36.7456+138.9400/+36.7406+138.9600/+36.7435+138.9800/+36.7402+139.0000/+36.7459+139.0200/+36.7527+139.0400/+36.7600+139.0475/+36.7750+139.0600/+36.7800+139.0684/+36.7889+139.0800/+36.8000+139.0942/+36.8048+139.1000/+36.8117+139.1200/+36.8171+139.1400/+36.8192+139.1600/+36.8189+139.1800/+36.8185+139.2000/+36.8200+139.2078/+36.8231+139.2200/+36.8317+139.2400/+36.8400+139.2493/+36.8489+139.2600/+36.8600+139.2697/+36.8657+139.2800/+36.8742+139.3000/+36.8783+139.3200/+36.8800+139.3284/+36.8823+139.3400/ 東 80 栃木県日光市 0920600 群馬県沼田市 1020600 群馬県中之条町 1042100 群馬県嬬恋村 1042500 群馬県草津町 1042600 群馬県高山村 1042800 群馬県片品村 1044300 群馬県川場村 1044400 群馬県みなかみ町 1044900 長野県高山村 2054300 長野県山ノ内町 2056100 小さな噴石の落下 75 1 +36.6767+138.5400/+36.6757+138.5600/+36.6675+138.5800/+36.6600+138.5939/+36.6490+138.5800/+36.6400+138.5779/+36.6238+138.5600/+36.6212+138.5400/+36.6400+138.5212/+36.6600+138.5233/+36.6767+138.5400/ 東 5 群馬県中之条町 1042100 群馬県草津町 1042600 長野県高山村 2054300 　現在、草津白根山（白根山（湯釜付近））は噴火警戒レベル２（火口周辺規制）です。草津白根山（白根山（湯釜付近））で噴火が発生した場合には、１０日０９時から１２時までは火口から北東方向、１０日２１時から２４時までは火口から東方向に降灰が予想されます。 　１０日９時から１１日３時までに噴火が発生した場合には、以下の方向・距離に降灰及び小さな噴石の落下が予想されます。 　 　時刻　　　　　　　　　　　　火口からの方向　降灰の距離　小さな噴石の距離 　１０日０９時から１２時まで　北東　　　　　　７０ｋｍ　　５ｋｍ　　　　　 　１０日１２時から１５時まで　北東　　　　　　８０ｋｍ　　６ｋｍ　　　　　 　１０日１５時から１８時まで　北東　　　　　　６０ｋｍ　　５ｋｍ　　　　　 　１０日１８時から２１時まで　東　　　　　　　４０ｋｍ　　５ｋｍ　　　　　 　１０日２１時から２４時まで　東　　　　　　　８０ｋｍ　　５ｋｍ　　　　　 　１１日００時から０３時まで　東　　　　　　　８０ｋｍ　　５ｋｍ　　　　　 　 　期間中に噴火が発生した場合には、以下の市町村に降灰が予想されます。 　群馬県　：中之条町、嬬恋村、草津町、みなかみ町、沼田市、高山村、片品村、川場村 　新潟県　：十日町市、魚沼市、南魚沼市、湯沢町、津南町 　長野県　：高山村、山ノ内町、栄村 　栃木県　：日光市 　 　噴煙が火口縁上１０００ｍまで上がった場合の火山灰及び小さな噴石の落下範囲を示しています。 　噴火発生時、小さな噴石の落下が予想される範囲内では、屋内や頑丈な屋根の下などに移動してください。 　強風のため、遠方まで小さな噴石が流されるおそれがあります。