(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA) (2) Issued:20171205/2315Z (3) Volcano:Klyuchevskoy (CAVW #300260) (4) Current aviation colour code:ORANGE (5) Previous aviation colour code:green (6) Source:KVERT (7) Notice Number:2017-258 (8) Volcano Location:N 56 deg 3 min E 160 deg 38 min (9) Area:Kamchatka, Russia (10) Summit Elevation:15580 ft (4750 m)(11) Volcanic Activity Summary:A strong gas-steam activity of the volcano was observing on 02-05 December. Some amount of ash in the gas-steam plumes began to detecting from ~ 1100 UTC on 05 December. Activity of the volcano continues.\n\nA gas-steam with some amount of ash activity of the volcano continues. Ongoing activity could affect low-flying aircraft. (12) Volcanic cloud height:15744-16400 ft (4800-5000 m) AMSL Time and method of ash plume/cloud height determination: 20171205/2310Z – Video data(13) Other volcanic cloud information:Distance of ash plume/cloud of the volcano: 106 mi (170 km)\nDirection of drift of ash plume/cloud of the volcano: E / azimuth 92 deg \nTime and method of ash plume/cloud determination: 20171205/2054Z – NOAA 18 (4m5)(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.