(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA) (2) Issued:20170402/0825Z (3) Volcano:Klyuchevskoy (CAVW #300260) (4) Current Aviation Color Code:ORANGE (5) Previous Aviation Color Code:orange (6) Source:KVERT (7) Notice Number:2017-51 (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:Ash plume extended about 407 km to the north-west from the volcano.\n\nThe explosive eruption of the volcano continues. Ash explosions up to 19,700-26,200 ft (6-8 km) a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircraft. (12) Volcanic cloud height:21320 ft (6500 m) AMSL Time and method of ash plume/cloud height determination: 20170402/0800Z – Himawary-8(13) Other volcanic cloud information:Distance of ash plume/cloud of the volcano: 253 mi (407 km)\nDirection of drift of ash plume/cloud of the volcano: NW / azimuth 317 deg \nTime and method of ash plume/cloud determination: 20170402/0800Z – Himawary-8(14) Remarks:(15) Contacts: Dmitry V. Melnikov, IVS FEB RAS\ndvm@kscnet.ru \n\nDuty scientist: +79622825253 (16) Next Notice:A new VONA will be issued if conditions change significantly or the Aviation Color Code is changes. 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.