2026-04-07T11:00:00Z 通常 気象庁本庁 気象庁 2026-04-07T20:00:00+09:00 2026-04-07T21:00:00+09:00 2026-04-08T15:00:00+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、７日２１時から２４時までは火口から南東方向、８日０９時から１２時までは火口から南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 群馬県高崎市 1020200 群馬県藤岡市 1020900 群馬県富岡市 1021000 群馬県安中市 1021100 群馬県甘楽町 1038400 群馬県中之条町 1042100 群馬県長野原町 1042400 群馬県嬬恋村 1042500 群馬県草津町 1042600 群馬県東吾妻町 1042900 群馬県玉村町 1046400 埼玉県本庄市 1121100 埼玉県深谷市 1121800 埼玉県小川町 1134300 埼玉県皆野町 1136200 埼玉県長瀞町 1136300 埼玉県東秩父村 1136900 埼玉県美里町 1138100 埼玉県神川町 1138300 埼玉県上里町 1138500 埼玉県寄居町 1140800 長野県高山村 2054300 長野県山ノ内町 2056100 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 群馬県高崎市 1020200 群馬県藤岡市 1020900 群馬県富岡市 1021000 群馬県安中市 1021100 群馬県甘楽町 1038400 群馬県中之条町 1042100 群馬県長野原町 1042400 群馬県嬬恋村 1042500 群馬県草津町 1042600 群馬県東吾妻町 1042900 群馬県玉村町 1046400 埼玉県本庄市 1121100 埼玉県深谷市 1121800 埼玉県小川町 1134300 埼玉県皆野町 1136200 埼玉県長瀞町 1136300 埼玉県東秩父村 1136900 埼玉県美里町 1138100 埼玉県神川町 1138300 埼玉県上里町 1138500 埼玉県寄居町 1140800 長野県高山村 2054300 長野県山ノ内町 2056100 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 2026-04-07T21:00:00+09:00 2026-04-08T00:00:00+09:00 降灰 70 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+36.1606+139.2600/+36.1600+139.2613/+36.1581+139.2600/+36.1600+139.2452/+36.1606+139.2600/ 南東 80 群馬県高崎市 1020200 群馬県藤岡市 1020900 群馬県富岡市 1021000 群馬県安中市 1021100 群馬県中之条町 1042100 群馬県長野原町 1042400 群馬県嬬恋村 1042500 群馬県草津町 1042600 群馬県東吾妻町 1042900 群馬県玉村町 1046400 埼玉県本庄市 1121100 埼玉県深谷市 1121800 埼玉県美里町 1138100 埼玉県神川町 1138300 埼玉県上里町 1138500 埼玉県寄居町 1140800 長野県高山村 2054300 小さな噴石の落下 75 1 +36.6545+138.5200/+36.6588+138.5400/+36.6570+138.5600/+36.6493+138.5800/+36.6400+138.5893/+36.6200+138.5970/+36.6011+138.6000/+36.6000+138.6007/+36.5993+138.6000/+36.5923+138.5800/+36.5936+138.5600/+36.6000+138.5536/+36.6026+138.5400/+36.6200+138.5226/+36.6255+138.5200/+36.6400+138.5055/+36.6545+138.5200/ 南東 8 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 2026-04-08T00:00:00+09:00 2026-04-08T03:00:00+09:00 降灰 70 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南東 90 群馬県高崎市 1020200 群馬県藤岡市 1020900 群馬県富岡市 1021000 群馬県安中市 1021100 群馬県中之条町 1042100 群馬県長野原町 1042400 群馬県嬬恋村 1042500 群馬県草津町 1042600 群馬県東吾妻町 1042900 埼玉県本庄市 1121100 埼玉県深谷市 1121800 埼玉県長瀞町 1136300 埼玉県美里町 1138100 埼玉県神川町 1138300 埼玉県上里町 1138500 埼玉県寄居町 1140800 長野県高山村 2054300 小さな噴石の落下 75 1 +36.6489+138.5200/+36.6588+138.5400/+36.6400+138.5588/+36.6366+138.5600/+36.6217+138.5800/+36.6200+138.5817/+36.6000+138.5968/+36.5837+138.5800/+36.5907+138.5600/+36.6000+138.5507/+36.6022+138.5400/+36.6200+138.5222/+36.6311+138.5200/+36.6400+138.5111/+36.6489+138.5200/ 南東 7 群馬県嬬恋村 1042500 群馬県草津町 1042600 長野県高山村 2054300 2026-04-08T03:00:00+09:00 2026-04-08T06:00:00+09:00 降灰 70 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南東 90 群馬県高崎市 1020200 群馬県藤岡市 1020900 群馬県富岡市 1021000 群馬県安中市 1021100 群馬県甘楽町 1038400 群馬県中之条町 1042100 群馬県長野原町 1042400 群馬県嬬恋村 1042500 群馬県草津町 1042600 群馬県東吾妻町 1042900 埼玉県本庄市 1121100 埼玉県小川町 1134300 埼玉県皆野町 1136200 埼玉県長瀞町 1136300 埼玉県東秩父村 1136900 埼玉県美里町 1138100 埼玉県神川町 1138300 埼玉県上里町 1138500 埼玉県寄居町 1140800 長野県高山村 2054300 小さな噴石の落下 75 1 +36.6586+138.5200/+36.6588+138.5400/+36.6400+138.5588/+36.6366+138.5600/+36.6200+138.5766/+36.6078+138.5800/+36.6000+138.5917/+36.5843+138.5800/+36.5896+138.5600/+36.6000+138.5496/+36.6019+138.5400/+36.6200+138.5219/+36.6214+138.5200/+36.6400+138.5014/+36.6586+138.5200/ 南東 7 群馬県嬬恋村 1042500 群馬県草津町 1042600 長野県高山村 2054300 2026-04-08T06:00:00+09:00 2026-04-08T09:00:00+09:00 降灰 70 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南東 80 群馬県高崎市 1020200 群馬県藤岡市 1020900 群馬県富岡市 1021000 群馬県安中市 1021100 群馬県甘楽町 1038400 群馬県中之条町 1042100 群馬県長野原町 1042400 群馬県嬬恋村 1042500 群馬県草津町 1042600 群馬県東吾妻町 1042900 埼玉県本庄市 1121100 埼玉県皆野町 1136200 埼玉県神川町 1138300 長野県高山村 2054300 小さな噴石の落下 75 1 +36.6582+138.5200/+36.6588+138.5400/+36.6400+138.5588/+36.6337+138.5600/+36.6200+138.5737/+36.6033+138.5800/+36.6000+138.5833/+36.5897+138.5800/+36.5867+138.5600/+36.6000+138.5473/+36.6012+138.5400/+36.6200+138.5226/+36.6218+138.5200/+36.6400+138.5018/+36.6582+138.5200/ 南東 7 群馬県嬬恋村 1042500 群馬県草津町 1042600 長野県高山村 2054300 2026-04-08T09:00:00+09:00 2026-04-08T12:00:00+09:00 降灰 70 +36.6599+138.5200/+36.6600+138.5400/+36.6592+138.5600/+36.6400+138.5792/+36.6369+138.5800/+36.6200+138.5969/+36.6128+138.6000/+36.6000+138.6128/+36.5872+138.6200/+36.5800+138.6272/+36.5601+138.6400/+36.5600+138.6401/+36.5425+138.6600/+36.5400+138.6625/+36.5228+138.6800/+36.5200+138.6828/+36.5008+138.7000/+36.5000+138.7008/+36.4800+138.7192/+36.4784+138.7200/+36.4600+138.7375/+36.4562+138.7400/+36.4424+138.7600/+36.4400+138.7629/+36.4200+138.7748/+36.4135+138.7800/+36.4000+138.7917/+36.3818+138.8000/+36.3800+138.8019/+36.3643+138.8200/+36.3600+138.8233/+36.3400+138.8312/+36.3200+138.8395/+36.3186+138.8400/+36.3000+138.8513/+36.2800+138.8565/+36.2613+138.8400/+36.2645+138.8200/+36.2665+138.8000/+36.2800+138.7847/+36.2838+138.7800/+36.2981+138.7600/+36.3000+138.7571/+36.3200+138.7403/+36.3204+138.7400/+36.3400+138.7279/+36.3529+138.7200/+36.3600+138.7157/+36.3781+138.7000/+36.3800+138.6984/+36.4000+138.6832/+36.4200+138.6801/+36.4202+138.6800/+36.4400+138.6617/+36.4416+138.6600/+36.4600+138.6429/+36.4630+138.6400/+36.4800+138.6237/+36.4845+138.6200/+36.5000+138.6047/+36.5061+138.6000/+36.5200+138.5862/+36.5332+138.5800/+36.5400+138.5732/+36.5600+138.5603/+36.5605+138.5600/+36.5800+138.5406/+36.5805+138.5400/+36.6000+138.5205/+36.6010+138.5200/+36.6200+138.5010/+36.6400+138.5002/+36.6599+138.5200/ 南東 50 群馬県高崎市 1020200 群馬県富岡市 1021000 群馬県安中市 1021100 群馬県中之条町 1042100 群馬県長野原町 1042400 群馬県嬬恋村 1042500 群馬県草津町 1042600 群馬県東吾妻町 1042900 長野県高山村 2054300 小さな噴石の落下 75 1 +36.6588+138.5200/+36.6588+138.5400/+36.6400+138.5588/+36.6243+138.5600/+36.6200+138.5643/+36.6040+138.5600/+36.6043+138.5400/+36.6200+138.5243/+36.6212+138.5200/+36.6400+138.5012/+36.6588+138.5200/ 南東 4 群馬県嬬恋村 1042500 群馬県草津町 1042600 長野県高山村 2054300 2026-04-08T12:00:00+09:00 2026-04-08T15:00:00+09:00 降灰 70 +36.6788+138.5200/+36.6794+138.5400/+36.6600+138.5600/+36.6596+138.5800/+36.6583+138.6000/+36.6552+138.6200/+36.6487+138.6400/+36.6400+138.6539/+36.6384+138.6600/+36.6356+138.6800/+36.6265+138.7000/+36.6200+138.7125/+36.6157+138.7200/+36.6000+138.7337/+36.5931+138.7400/+36.5800+138.7510/+36.5632+138.7600/+36.5600+138.7625/+36.5400+138.7657/+36.5202+138.7800/+36.5200+138.7801/+36.5000+138.7908/+36.4800+138.7922/+36.4676+138.7800/+36.4627+138.7600/+36.4713+138.7400/+36.4800+138.7217/+36.4809+138.7200/+36.4909+138.7000/+36.5000+138.6902/+36.5043+138.6800/+36.5102+138.6600/+36.5200+138.6461/+36.5212+138.6400/+36.5300+138.6200/+36.5400+138.6093/+36.5430+138.6000/+36.5600+138.5828/+36.5609+138.5800/+36.5800+138.5607/+36.5803+138.5600/+36.5990+138.5400/+36.6000+138.5390/+36.6025+138.5200/+36.6200+138.5025/+36.6400+138.5001/+36.6600+138.5012/+36.6788+138.5200/ 南東 30 群馬県高崎市 1020200 群馬県中之条町 1042100 群馬県長野原町 1042400 群馬県嬬恋村 1042500 群馬県草津町 1042600 群馬県東吾妻町 1042900 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 +36.6588+138.5200/+36.6588+138.5400/+36.6400+138.5595/+36.6200+138.5430/+36.6184+138.5400/+36.6200+138.5383/+36.6212+138.5200/+36.6400+138.5012/+36.6588+138.5200/ 南東 3 群馬県嬬恋村 1042500 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、７日２１時から２４時までは火口から南東方向、８日０９時から１２時までは火口から南東方向に降灰が予想されます。 　７日２１時から８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 　０７日２１時から２４時まで　南東　　　　　　８０ｋｍ　　８ｋｍ　　　　　 　０８日００時から０３時まで　南東　　　　　　９０ｋｍ　　７ｋｍ　　　　　 　０８日０３時から０６時まで　南東　　　　　　９０ｋｍ　　７ｋｍ　　　　　 　０８日０６時から０９時まで　南東　　　　　　８０ｋｍ　　７ｋｍ　　　　　 　０８日０９時から１２時まで　南東　　　　　　５０ｋｍ　　４ｋｍ　　　　　 　０８日１２時から１５時まで　南東　　　　　　３０ｋｍ　　３ｋｍ　　　　　 　 　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　：草津町、高崎市、藤岡市、富岡市、安中市、中之条町、長野原町、嬬恋村、東吾妻町、 　　　　　玉村町、甘楽町 　埼玉県　：本庄市、深谷市、美里町、神川町、上里町、寄居町、長瀞町、小川町、皆野町、東秩父村 　長野県　：高山村、山ノ内町 　 　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。