2026-09-20T05:00:00Z 通常 気象庁本庁 気象庁 2026-09-20T14:00:00+09:00 2026-09-20T15:00:00+09:00 2026-09-21T09:00:00+09:00 503 発表 1 降灰予報 1.1_0 　現在、阿蘇山は噴火警戒レベル２（火口周辺規制）です。阿蘇山で噴火が発生した場合には、２０日２１時から２４時までは火口から南方向に降灰が予想されます。 降灰予報（定時） 06 阿蘇山 503 降灰 70 熊本県八代市 4320200 熊本県阿蘇市 4321400 熊本県美里町 4334800 熊本県高森町 4342800 熊本県南阿蘇村 4343300 熊本県山都町 4344700 熊本県五木村 4351100 宮崎県椎葉村 4543000 小さな噴石の落下 75 熊本県阿蘇市 4321400 熊本県南阿蘇村 4343300 降灰予報（定時） 06 阿蘇山 503 +3253.07+13106.23+1592/ 降灰 70 熊本県八代市 4320200 熊本県阿蘇市 4321400 熊本県美里町 4334800 熊本県高森町 4342800 熊本県南阿蘇村 4343300 熊本県山都町 4344700 熊本県五木村 4351100 宮崎県椎葉村 4543000 小さな噴石の落下 75 熊本県阿蘇市 4321400 熊本県南阿蘇村 4343300 2026-09-20T15:00:00+09:00 2026-09-20T18:00:00+09:00 降灰 70 +32.9175+131.0800/+32.9073+131.1000/+32.9000+131.1073/+32.8800+131.1195/+32.8600+131.1129/+32.8471+131.1000/+32.8400+131.0998/+32.8200+131.0980/+32.8002+131.0800/+32.8000+131.0799/+32.7800+131.0780/+32.7600+131.0700/+32.7486+131.0600/+32.7400+131.0555/+32.7203+131.0400/+32.7200+131.0398/+32.7000+131.0291/+32.6800+131.0271/+32.6721+131.0200/+32.6600+131.0123/+32.6400+131.0031/+32.6344+131.0000/+32.6200+130.9950/+32.6012+130.9800/+32.6000+130.9790/+32.5842+130.9600/+32.5800+130.9520/+32.5665+130.9400/+32.5600+130.9350/+32.5400+130.9251/+32.5364+130.9200/+32.5246+130.9000/+32.5200+130.8929/+32.5000+130.8803/+32.4996+130.8800/+32.5000+130.8793/+32.5200+130.8616/+32.5217+130.8600/+32.5400+130.8521/+32.5600+130.8492/+32.5800+130.8557/+32.5878+130.8600/+32.6000+130.8662/+32.6176+130.8800/+32.6200+130.8807/+32.6400+130.8890/+32.6576+130.9000/+32.6600+130.9052/+32.6682+130.9200/+32.6800+130.9246/+32.7000+130.9345/+32.7056+130.9400/+32.7200+130.9475/+32.7342+130.9600/+32.7400+130.9620/+32.7600+130.9726/+32.7677+130.9800/+32.7800+130.9830/+32.7982+131.0000/+32.8000+131.0004/+32.8200+131.0076/+32.8324+131.0200/+32.8400+131.0208/+32.8594+131.0400/+32.8600+131.0400/+32.8800+131.0403/+32.8997+131.0600/+32.9000+131.0625/+32.9175+131.0800/ 南西 50 熊本県八代市 4320200 熊本県阿蘇市 4321400 熊本県美里町 4334800 熊本県高森町 4342800 熊本県南阿蘇村 4343300 熊本県山都町 4344700 小さな噴石の落下 75 1 +32.8988+131.0800/+32.8800+131.0988/+32.8600+131.0812/+32.8585+131.0800/+32.8600+131.0751/+32.8800+131.0603/+32.8988+131.0800/ 南 3 熊本県阿蘇市 4321400 熊本県南阿蘇村 4343300 2026-09-20T18:00:00+09:00 2026-09-20T21:00:00+09:00 降灰 70 +32.9145+131.0800/+32.9000+131.0981/+32.8999+131.1000/+32.8800+131.1196/+32.8600+131.1191/+32.8400+131.1090/+32.8259+131.1000/+32.8200+131.0999/+32.8000+131.0998/+32.7800+131.0996/+32.7600+131.0992/+32.7400+131.0980/+32.7200+131.0957/+32.7000+131.0924/+32.6800+131.0910/+32.6641+131.0800/+32.6600+131.0772/+32.6400+131.0703/+32.6268+131.0600/+32.6200+131.0568/+32.6000+131.0438/+32.5962+131.0400/+32.5800+131.0235/+32.5759+131.0200/+32.5600+131.0018/+32.5587+131.0000/+32.5417+130.9800/+32.5400+130.9783/+32.5200+130.9626/+32.5157+130.9600/+32.5000+130.9468/+32.4876+130.9400/+32.4800+130.9368/+32.4600+130.9312/+32.4466+130.9200/+32.4400+130.9113/+32.4200+130.9015/+32.4169+130.9000/+32.4200+130.8983/+32.4400+130.8909/+32.4600+130.8904/+32.4800+130.8989/+32.5000+130.8994/+32.5200+130.8998/+32.5400+130.8951/+32.5600+130.8927/+32.5749+130.9000/+32.5800+130.9017/+32.6000+130.9114/+32.6129+130.9200/+32.6200+130.9243/+32.6350+130.9400/+32.6400+130.9446/+32.6549+130.9600/+32.6600+130.9619/+32.6800+130.9676/+32.6967+130.9800/+32.7000+130.9813/+32.7200+130.9862/+32.7400+130.9919/+32.7519+131.0000/+32.7600+131.0008/+32.7800+131.0034/+32.8000+131.0183/+32.8017+131.0200/+32.8200+131.0216/+32.8400+131.0388/+32.8412+131.0400/+32.8600+131.0402/+32.8800+131.0408/+32.8992+131.0600/+32.9000+131.0655/+32.9145+131.0800/ 南 50 熊本県八代市 4320200 熊本県阿蘇市 4321400 熊本県美里町 4334800 熊本県高森町 4342800 熊本県南阿蘇村 4343300 熊本県山都町 4344700 熊本県五木村 4351100 小さな噴石の落下 75 1 +32.8988+131.0800/+32.8800+131.0988/+32.8600+131.0884/+32.8494+131.0800/+32.8600+131.0663/+32.8800+131.0612/+32.8988+131.0800/ 南 3 熊本県阿蘇市 4321400 熊本県南阿蘇村 4343300 2026-09-20T21:00:00+09:00 2026-09-21T00:00:00+09:00 降灰 70 +32.9126+131.0800/+32.9000+131.0957/+32.8998+131.1000/+32.8800+131.1195/+32.8600+131.1181/+32.8415+131.1000/+32.8400+131.1000/+32.8200+131.0998/+32.8000+131.0994/+32.7800+131.0983/+32.7600+131.0956/+32.7400+131.0897/+32.7244+131.0800/+32.7200+131.0787/+32.7000+131.0772/+32.6800+131.0747/+32.6600+131.0623/+32.6563+131.0600/+32.6400+131.0540/+32.6200+131.0467/+32.6099+131.0400/+32.6000+131.0353/+32.5874+131.0200/+32.5803+131.0000/+32.5800+130.9996/+32.5600+130.9890/+32.5505+130.9800/+32.5400+130.9723/+32.5265+130.9600/+32.5200+130.9509/+32.5000+130.9447/+32.4880+130.9400/+32.4800+130.9363/+32.4600+130.9276/+32.4462+130.9200/+32.4400+130.9159/+32.4200+130.9039/+32.4148+130.9000/+32.4200+130.8810/+32.4206+130.8800/+32.4400+130.8678/+32.4600+130.8667/+32.4800+130.8620/+32.5000+130.8653/+32.5200+130.8688/+32.5400+130.8752/+32.5524+130.8800/+32.5600+130.8808/+32.5800+130.8854/+32.6000+130.8942/+32.6082+130.9000/+32.6200+130.9069/+32.6328+130.9200/+32.6400+130.9322/+32.6453+130.9400/+32.6600+130.9570/+32.6635+130.9600/+32.6800+130.9658/+32.6974+130.9800/+32.7000+130.9810/+32.7200+130.9867/+32.7400+130.9981/+32.7422+131.0000/+32.7600+131.0016/+32.7800+131.0072/+32.7932+131.0200/+32.8000+131.0205/+32.8200+131.0228/+32.8375+131.0400/+32.8400+131.0401/+32.8600+131.0402/+32.8800+131.0417/+32.8983+131.0600/+32.9000+131.0674/+32.9126+131.0800/ 南 50 熊本県八代市 4320200 熊本県阿蘇市 4321400 熊本県美里町 4334800 熊本県高森町 4342800 熊本県南阿蘇村 4343300 熊本県山都町 4344700 熊本県五木村 4351100 小さな噴石の落下 75 1 +32.8988+131.0800/+32.8800+131.0988/+32.8600+131.0902/+32.8473+131.0800/+32.8600+131.0668/+32.8800+131.0612/+32.8988+131.0800/ 南 3 熊本県阿蘇市 4321400 熊本県南阿蘇村 4343300 2026-09-21T00:00:00+09:00 2026-09-21T03:00:00+09:00 降灰 70 +32.9148+131.0800/+32.9000+131.0996/+32.9000+131.1000/+32.8800+131.1196/+32.8600+131.1175/+32.8425+131.1000/+32.8400+131.0999/+32.8200+131.0998/+32.8000+131.0994/+32.7800+131.0981/+32.7600+131.0947/+32.7400+131.0879/+32.7245+131.0800/+32.7200+131.0796/+32.7000+131.0791/+32.6800+131.0776/+32.6600+131.0739/+32.6400+131.0725/+32.6200+131.0636/+32.6014+131.0600/+32.6000+131.0599/+32.5800+131.0518/+32.5639+131.0400/+32.5600+131.0377/+32.5400+131.0209/+32.5387+131.0200/+32.5213+131.0000/+32.5200+130.9966/+32.5000+130.9899/+32.4848+130.9800/+32.4800+130.9748/+32.4683+130.9600/+32.4600+130.9512/+32.4513+130.9400/+32.4443+130.9200/+32.4516+130.9000/+32.4600+130.8987/+32.4800+130.8984/+32.4930+130.9000/+32.5000+130.9008/+32.5200+130.9026/+32.5400+130.9017/+32.5600+130.9011/+32.5800+130.9101/+32.5962+130.9200/+32.6000+130.9224/+32.6174+130.9400/+32.6200+130.9410/+32.6361+130.9600/+32.6400+130.9674/+32.6558+130.9800/+32.6600+130.9816/+32.6800+130.9869/+32.6964+131.0000/+32.7000+131.0007/+32.7200+131.0022/+32.7400+131.0045/+32.7600+131.0101/+32.7716+131.0200/+32.7800+131.0204/+32.8000+131.0212/+32.8200+131.0290/+32.8312+131.0400/+32.8400+131.0401/+32.8600+131.0401/+32.8800+131.0421/+32.8979+131.0600/+32.9000+131.0652/+32.9148+131.0800/ 南 50 熊本県八代市 4320200 熊本県阿蘇市 4321400 熊本県美里町 4334800 熊本県高森町 4342800 熊本県南阿蘇村 4343300 熊本県山都町 4344700 熊本県五木村 4351100 宮崎県椎葉村 4543000 小さな噴石の落下 75 1 +32.8988+131.0800/+32.8800+131.0988/+32.8600+131.0887/+32.8494+131.0800/+32.8600+131.0684/+32.8800+131.0612/+32.8988+131.0800/ 南 3 熊本県阿蘇市 4321400 熊本県南阿蘇村 4343300 2026-09-21T03:00:00+09:00 2026-09-21T06:00:00+09:00 降灰 70 +32.9127+131.0800/+32.9000+131.0968/+32.8999+131.1000/+32.8800+131.1196/+32.8600+131.1188/+32.8408+131.1000/+32.8400+131.1000/+32.8200+131.0999/+32.8000+131.0997/+32.7800+131.0995/+32.7600+131.0991/+32.7400+131.0984/+32.7200+131.0985/+32.7000+131.0991/+32.6825+131.1000/+32.6800+131.1007/+32.6600+131.1012/+32.6568+131.1000/+32.6400+131.0981/+32.6200+131.0967/+32.6000+131.0994/+32.5800+131.0973/+32.5600+131.0939/+32.5400+131.0856/+32.5319+131.0800/+32.5202+131.0600/+32.5200+131.0593/+32.5049+131.0400/+32.5000+131.0332/+32.4914+131.0200/+32.4806+131.0000/+32.4971+130.9800/+32.5000+130.9776/+32.5200+130.9657/+32.5235+130.9600/+32.5400+130.9408/+32.5600+130.9403/+32.5616+130.9400/+32.5800+130.9344/+32.5880+130.9400/+32.6000+130.9431/+32.6200+130.9494/+32.6294+130.9600/+32.6400+130.9748/+32.6476+130.9800/+32.6600+130.9845/+32.6800+130.9947/+32.6867+131.0000/+32.7000+131.0025/+32.7200+131.0042/+32.7400+131.0069/+32.7588+131.0200/+32.7600+131.0201/+32.7800+131.0210/+32.8000+131.0221/+32.8200+131.0342/+32.8258+131.0400/+32.8400+131.0401/+32.8600+131.0402/+32.8800+131.0441/+32.8959+131.0600/+32.9000+131.0673/+32.9127+131.0800/ 南 40 熊本県八代市 4320200 熊本県阿蘇市 4321400 熊本県美里町 4334800 熊本県高森町 4342800 熊本県南阿蘇村 4343300 熊本県山都町 4344700 宮崎県椎葉村 4543000 小さな噴石の落下 75 1 +32.8988+131.0800/+32.8800+131.0988/+32.8600+131.0911/+32.8464+131.0800/+32.8600+131.0671/+32.8800+131.0612/+32.8988+131.0800/ 南 3 熊本県阿蘇市 4321400 熊本県南阿蘇村 4343300 2026-09-21T06:00:00+09:00 2026-09-21T09:00:00+09:00 降灰 70 +32.9110+131.0800/+32.9000+131.0941/+32.8997+131.1000/+32.8800+131.1195/+32.8600+131.1179/+32.8420+131.1000/+32.8400+131.0999/+32.8200+131.0998/+32.8000+131.0994/+32.7800+131.0986/+32.7600+131.0970/+32.7400+131.0929/+32.7200+131.0853/+32.7023+131.0800/+32.7000+131.0797/+32.6800+131.0772/+32.6600+131.0723/+32.6400+131.0608/+32.6387+131.0600/+32.6200+131.0529/+32.6000+131.0410/+32.5991+131.0400/+32.5810+131.0200/+32.5800+131.0183/+32.5608+131.0000/+32.5600+130.9994/+32.5404+130.9800/+32.5400+130.9796/+32.5211+130.9600/+32.5200+130.9572/+32.5000+130.9530/+32.4800+130.9481/+32.4600+130.9424/+32.4553+130.9400/+32.4400+130.9243/+32.4354+130.9200/+32.4200+130.9029/+32.4178+130.9000/+32.4200+130.8975/+32.4400+130.8823/+32.4466+130.8800/+32.4600+130.8765/+32.4800+130.8748/+32.5000+130.8745/+32.5200+130.8742/+32.5332+130.8800/+32.5400+130.8816/+32.5600+130.8843/+32.5800+130.8920/+32.5921+130.9000/+32.6000+130.9056/+32.6168+130.9200/+32.6200+130.9228/+32.6332+130.9400/+32.6400+130.9523/+32.6462+130.9600/+32.6600+130.9647/+32.6793+130.9800/+32.6800+130.9803/+32.7000+130.9881/+32.7167+131.0000/+32.7200+131.0004/+32.7400+131.0018/+32.7600+131.0036/+32.7800+131.0192/+32.7808+131.0200/+32.8000+131.0208/+32.8200+131.0248/+32.8355+131.0400/+32.8400+131.0401/+32.8600+131.0401/+32.8800+131.0414/+32.8986+131.0600/+32.9000+131.0690/+32.9110+131.0800/ 南 50 熊本県八代市 4320200 熊本県阿蘇市 4321400 熊本県美里町 4334800 熊本県高森町 4342800 熊本県南阿蘇村 4343300 熊本県山都町 4344700 熊本県五木村 4351100 小さな噴石の落下 75 1 +32.8988+131.0800/+32.8800+131.0988/+32.8600+131.0888/+32.8491+131.0800/+32.8600+131.0672/+32.8800+131.0612/+32.8988+131.0800/ 南 3 熊本県阿蘇市 4321400 熊本県南阿蘇村 4343300 　現在、阿蘇山は噴火警戒レベル２（火口周辺規制）です。阿蘇山で噴火が発生した場合には、２０日２１時から２４時までは火口から南方向に降灰が予想されます。 　２０日１５時から２１日９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 　２０日１５時から１８時まで　南西　　　　　　５０ｋｍ　　３ｋｍ　　　　　 　２０日１８時から２１時まで　南　　　　　　　５０ｋｍ　　３ｋｍ　　　　　 　２０日２１時から２４時まで　南　　　　　　　５０ｋｍ　　３ｋｍ　　　　　 　２１日００時から０３時まで　南　　　　　　　５０ｋｍ　　３ｋｍ　　　　　 　２１日０３時から０６時まで　南　　　　　　　４０ｋｍ　　３ｋｍ　　　　　 　２１日０６時から０９時まで　南　　　　　　　５０ｋｍ　　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。 　熊本県　：八代市、阿蘇市、美里町、高森町、南阿蘇村、山都町、五木村 　宮崎県　：椎葉村 　 　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。