(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued:	20171220/0409Z
(3) Volcano:	Bezymianny (CAVW #300250)
(4) Current aviation colour code:	RED
(5) Previous aviation colour code:	orange
(6) Source:	KVERT
(7) Notice Number:	2017-267
(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 10-15 km a.s.l. started at 03:55 UTC. Ash plume on the height about 8 km a.s.l. drift to the north-east from the volcano. KVERT continues to monitor Bezymianny volcano. Activity of the volcano continues. Strong ash explosions up to 49,200 ft (15 km) a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircraft.
(12) Volcanic cloud height:	26240 ft (8000 m) AMSL Time and method of ash plume/cloud height determination: 20171220/0400Z – Video data
(13) Other volcanic cloud information:	Distance of ash plume/cloud of the volcano: 12 mi (20 km) Direction of drift of ash plume/cloud of the volcano: NE Time and method of ash plume/cloud determination: 20171219/0400Z – Visual data Start time of explosion and how determined: 20171219/0355Z – Video data
(14) Remarks:
(15) Contacts:	Anton A. Nuzhdaev, IVS FEB RAS envi@kscnet.ru Duty 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. In 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.