(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA) (2) Issued:20171220/0424Z (3) Volcano:Bezymianny (CAVW #300250) (4) Current aviation colour code:RED (5) Previous aviation colour code:red (6) Source:KVERT (7) Notice Number:2017-268 (8) Volcano Location:N 55 deg 58 min E 160 deg 35 min (9) Area:Kamchatka, Russia (10) Summit Elevation:9452.96 ft (2882 m)(11) Volcanic Activity Summary:According to video data by RAS, a strong ash explosions up to 15 km a.s.l. started at 03:55 UTC. Ash cloud drift to the north-east from the volcano. KVERT continues to monitor Bezymianny volcano.\n\nStrong ash explosions up to 49,200 ft (15 km) a.s.l. occur at this time. Ongoing activity could affect international and low-flying aircraft. (12) Volcanic cloud height:49200 ft (15000 m) AMSL Time and method of ash plume/cloud height determination: 20171220/0420Z – Video data(13) Other volcanic cloud information:Distance of ash plume/cloud of the volcano: 12 mi (20 km)\nDirection of drift of ash plume/cloud of the volcano: NE\nTime and method of ash plume/cloud determination: 20171220/0420Z – Video data\nStart time of explosion and how determined: 20171220/0355Z – Video data(14) Remarks:(15) Contacts:Dr. Olga A. Girina, Head of KVERT, IVS FEB RAS\ngirina@kscnet.ru +74152202044\n\nDuty scientist: +79622825253 (16) Next Notice:A new VONA will be issued if conditions change significantly or the colour code is changed. VONAs are posted at http://www.kscnet.ru/ivs/kvert/index_eng.php.\n\nIn Russia, KVERT, on behalf of the Institute of Volcanology and Seismology (IVS) FEB RAS, is responsible for providing information on volcanic activity to international air navigation services for the airspace users.