2026-04-06T11:00:00Z 通常 気象庁本庁 気象庁 2026-04-06T20:00:00+09:00 2026-04-06T21:00:00+09:00 2026-04-07T15:00:00+09:00 306 発表 1 降灰予報 1.1_0 　現在、浅間山は噴火警戒レベル２（火口周辺規制）です。浅間山で噴火が発生した場合には、６日２１時から２４時までは火口から北東方向、７日０９時から１２時までは火口から北東方向に降灰が予想されます。 降灰予報（定時） 06 浅間山 306 降灰 70 栃木県日光市 0920600 群馬県前橋市 1020100 群馬県高崎市 1020200 群馬県沼田市 1020600 群馬県渋川市 1020800 群馬県安中市 1021100 群馬県榛東村 1034400 群馬県吉岡町 1034500 群馬県中之条町 1042100 群馬県長野原町 1042400 群馬県嬬恋村 1042500 群馬県高山村 1042800 群馬県東吾妻町 1042900 群馬県片品村 1044300 群馬県川場村 1044400 群馬県昭和村 1044800 群馬県みなかみ町 1044900 長野県軽井沢町 2032100 長野県御代田町 2032300 小さな噴石の落下 75 群馬県長野原町 1042400 群馬県嬬恋村 1042500 長野県軽井沢町 2032100 長野県御代田町 2032300 降灰予報（定時） 06 浅間山 306 +3624.38+13831.38+2568/ 降灰 70 栃木県日光市 0920600 群馬県前橋市 1020100 群馬県高崎市 1020200 群馬県沼田市 1020600 群馬県渋川市 1020800 群馬県安中市 1021100 群馬県榛東村 1034400 群馬県吉岡町 1034500 群馬県中之条町 1042100 群馬県長野原町 1042400 群馬県嬬恋村 1042500 群馬県高山村 1042800 群馬県東吾妻町 1042900 群馬県片品村 1044300 群馬県川場村 1044400 群馬県昭和村 1044800 群馬県みなかみ町 1044900 長野県軽井沢町 2032100 長野県御代田町 2032300 小さな噴石の落下 75 群馬県長野原町 1042400 群馬県嬬恋村 1042500 長野県軽井沢町 2032100 長野県御代田町 2032300 2026-04-06T21:00:00+09:00 2026-04-07T00:00:00+09:00 降灰 70 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北東 80 栃木県日光市 0920600 群馬県高崎市 1020200 群馬県沼田市 1020600 群馬県渋川市 1020800 群馬県中之条町 1042100 群馬県長野原町 1042400 群馬県嬬恋村 1042500 群馬県高山村 1042800 群馬県東吾妻町 1042900 群馬県川場村 1044400 群馬県昭和村 1044800 群馬県みなかみ町 1044900 長野県軽井沢町 2032100 長野県御代田町 2032300 小さな噴石の落下 75 1 +36.4388+138.5400/+36.4378+138.5600/+36.4389+138.5800/+36.4200+138.5984/+36.4097+138.5800/+36.4039+138.5600/+36.4000+138.5588/+36.3812+138.5400/+36.3812+138.5200/+36.4000+138.5012/+36.4188+138.5200/+36.4200+138.5212/+36.4388+138.5400/ 東 5 群馬県長野原町 1042400 群馬県嬬恋村 1042500 長野県軽井沢町 2032100 長野県御代田町 2032300 2026-04-07T00:00:00+09:00 2026-04-07T03:00:00+09:00 降灰 70 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+36.8004+139.4600/+36.8000+139.4663/+36.7967+139.4600/+36.8000+139.4461/+36.8004+139.4600/ 北東 90 栃木県日光市 0920600 群馬県高崎市 1020200 群馬県沼田市 1020600 群馬県渋川市 1020800 群馬県中之条町 1042100 群馬県長野原町 1042400 群馬県嬬恋村 1042500 群馬県高山村 1042800 群馬県東吾妻町 1042900 群馬県片品村 1044300 群馬県川場村 1044400 群馬県昭和村 1044800 群馬県みなかみ町 1044900 長野県軽井沢町 2032100 長野県御代田町 2032300 小さな噴石の落下 75 1 +36.4485+138.5600/+36.4505+138.5800/+36.4400+138.5972/+36.4200+138.5901/+36.4099+138.5800/+36.4033+138.5600/+36.4000+138.5588/+36.3812+138.5400/+36.4000+138.5212/+36.4200+138.5212/+36.4388+138.5400/+36.4400+138.5515/+36.4485+138.5600/ 北東 6 群馬県長野原町 1042400 群馬県嬬恋村 1042500 長野県軽井沢町 2032100 2026-04-07T03:00:00+09:00 2026-04-07T06:00:00+09:00 降灰 70 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北東 100 栃木県日光市 0920600 群馬県高崎市 1020200 群馬県沼田市 1020600 群馬県渋川市 1020800 群馬県中之条町 1042100 群馬県長野原町 1042400 群馬県嬬恋村 1042500 群馬県高山村 1042800 群馬県東吾妻町 1042900 群馬県片品村 1044300 群馬県川場村 1044400 群馬県みなかみ町 1044900 長野県軽井沢町 2032100 長野県御代田町 2032300 小さな噴石の落下 75 1 +36.4508+138.5600/+36.4541+138.5800/+36.4400+138.5983/+36.4200+138.5886/+36.4114+138.5800/+36.4038+138.5600/+36.4012+138.5400/+36.4200+138.5212/+36.4388+138.5400/+36.4400+138.5492/+36.4508+138.5600/ 北東 6 群馬県長野原町 1042400 群馬県嬬恋村 1042500 長野県軽井沢町 2032100 2026-04-07T06:00:00+09:00 2026-04-07T09:00:00+09:00 降灰 70 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北東 90 栃木県日光市 0920600 群馬県高崎市 1020200 群馬県沼田市 1020600 群馬県渋川市 1020800 群馬県中之条町 1042100 群馬県長野原町 1042400 群馬県嬬恋村 1042500 群馬県高山村 1042800 群馬県東吾妻町 1042900 群馬県片品村 1044300 群馬県川場村 1044400 群馬県昭和村 1044800 群馬県みなかみ町 1044900 長野県軽井沢町 2032100 長野県御代田町 2032300 小さな噴石の落下 75 1 +36.4453+138.5600/+36.4477+138.5800/+36.4400+138.5961/+36.4200+138.5887/+36.4113+138.5800/+36.4042+138.5600/+36.4000+138.5588/+36.3812+138.5400/+36.4000+138.5212/+36.4200+138.5212/+36.4388+138.5400/+36.4400+138.5547/+36.4453+138.5600/ 北東 6 群馬県長野原町 1042400 群馬県嬬恋村 1042500 長野県軽井沢町 2032100 2026-04-07T09:00:00+09:00 2026-04-07T12:00:00+09:00 降灰 70 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北東 90 栃木県日光市 0920600 群馬県高崎市 1020200 群馬県沼田市 1020600 群馬県渋川市 1020800 群馬県中之条町 1042100 群馬県長野原町 1042400 群馬県嬬恋村 1042500 群馬県高山村 1042800 群馬県東吾妻町 1042900 群馬県片品村 1044300 群馬県川場村 1044400 群馬県昭和村 1044800 長野県軽井沢町 2032100 長野県御代田町 2032300 小さな噴石の落下 75 1 +36.4415+138.5800/+36.4400+138.5872/+36.4200+138.5989/+36.4094+138.5800/+36.4032+138.5600/+36.4000+138.5588/+36.3812+138.5400/+36.3812+138.5200/+36.4000+138.5012/+36.4188+138.5200/+36.4200+138.5212/+36.4388+138.5400/+36.4374+138.5600/+36.4400+138.5781/+36.4415+138.5800/ 北東 6 群馬県長野原町 1042400 群馬県嬬恋村 1042500 長野県軽井沢町 2032100 長野県御代田町 2032300 2026-04-07T12:00:00+09:00 2026-04-07T15:00:00+09:00 降灰 70 +36.5243+138.7400/+36.5262+138.7600/+36.5226+138.7800/+36.5200+138.7956/+36.5199+138.8000/+36.5200+138.8044/+36.5228+138.8200/+36.5314+138.8400/+36.5307+138.8600/+36.5305+138.8800/+36.5283+138.9000/+36.5201+138.9200/+36.5200+138.9203/+36.5129+138.9400/+36.5027+138.9600/+36.5000+138.9650/+36.4870+138.9800/+36.4800+138.9847/+36.4600+138.9938/+36.4521+139.0000/+36.4400+139.0160/+36.4320+139.0200/+36.4200+139.0263/+36.4000+139.0379/+36.3800+139.0378/+36.3600+139.0376/+36.3505+139.0200/+36.3459+139.0000/+36.3600+138.9852/+36.3685+138.9800/+36.3800+138.9713/+36.3931+138.9600/+36.4000+138.9572/+36.4200+138.9509/+36.4246+138.9400/+36.4319+138.9200/+36.4353+138.9000/+36.4371+138.8800/+36.4359+138.8600/+36.4314+138.8400/+36.4203+138.8200/+36.4200+138.8190/+36.4078+138.8000/+36.4000+138.7865/+36.3974+138.7800/+36.4000+138.7697/+36.4014+138.7600/+36.4034+138.7400/+36.4041+138.7200/+36.4034+138.7000/+36.4062+138.6800/+36.4050+138.6600/+36.4030+138.6400/+36.4016+138.6200/+36.4003+138.6000/+36.4000+138.5800/+36.4000+138.5798/+36.3807+138.5600/+36.3802+138.5400/+36.3811+138.5200/+36.4000+138.5011/+36.4200+138.5009/+36.4391+138.5200/+36.4400+138.5291/+36.4509+138.5400/+36.4598+138.5600/+36.4600+138.5750/+36.4650+138.5800/+36.4793+138.6000/+36.4800+138.6108/+36.4892+138.6200/+36.4994+138.6400/+36.5000+138.6430/+36.5158+138.6600/+36.5182+138.6800/+36.5191+138.7000/+36.5199+138.7200/+36.5200+138.7231/+36.5243+138.7400/ 東 40 群馬県前橋市 1020100 群馬県高崎市 1020200 群馬県渋川市 1020800 群馬県安中市 1021100 群馬県榛東村 1034400 群馬県吉岡町 1034500 群馬県長野原町 1042400 群馬県嬬恋村 1042500 群馬県東吾妻町 1042900 長野県軽井沢町 2032100 長野県御代田町 2032300 小さな噴石の落下 75 1 +36.4385+138.5200/+36.4388+138.5400/+36.4376+138.5600/+36.4357+138.5800/+36.4200+138.5909/+36.4106+138.5800/+36.4036+138.5600/+36.4000+138.5588/+36.3812+138.5400/+36.3812+138.5200/+36.4000+138.5012/+36.4200+138.5015/+36.4385+138.5200/ 北東 5 群馬県長野原町 1042400 群馬県嬬恋村 1042500 長野県軽井沢町 2032100 長野県御代田町 2032300 　現在、浅間山は噴火警戒レベル２（火口周辺規制）です。浅間山で噴火が発生した場合には、６日２１時から２４時までは火口から北東方向、７日０９時から１２時までは火口から北東方向に降灰が予想されます。 　６日２１時から７日１５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 　０６日２１時から２４時まで　北東　　　　　　８０ｋｍ　　５ｋｍ　　　　　 　０７日００時から０３時まで　北東　　　　　　９０ｋｍ　　６ｋｍ　　　　　 　０７日０３時から０６時まで　北東　　　　　　１００ｋｍ　６ｋｍ　　　　　 　０７日０６時から０９時まで　北東　　　　　　９０ｋｍ　　６ｋｍ　　　　　 　０７日０９時から１２時まで　北東　　　　　　９０ｋｍ　　６ｋｍ　　　　　 　０７日１２時から１５時まで　東　　　　　　　４０ｋｍ　　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。 　栃木県　：日光市 　群馬県　：高崎市、沼田市、渋川市、中之条町、長野原町、嬬恋村、高山村、東吾妻町、川場村、 　　　　　昭和村、みなかみ町、片品村、前橋市、安中市、榛東村、吉岡町 　長野県　：軽井沢町、御代田町 　 　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。