(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA) (2) Issued:20190421/2139Z (3) Volcano:Klyuchevskoy (CAVW #300260) (4) Current aviation colour code:YELLOW (5) Previous aviation colour code:yellow (6) Source:KVERT (7) Notice Number:2019-82 (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:An ash plume extended about 140 km to the east from the volcano.\n\nA moderate activity of the volcano continues. Ash explosions up to 16,400-19,700 ft (5-6 km) a.s.l. could occur at any time. Ongoing activity could affect low-flying aircraft. (12) Volcanic cloud height:16400-18040 ft (5000-5500 m) AMSL Time and method of ash plume/cloud height determination: 20190421/2120Z – Himawari-8(13) Other volcanic cloud information:Distance of ash plume/cloud of the volcano: 87 mi (140 km)\nDirection of drift of ash plume/cloud of the volcano: E / azimuth 90 deg \nTime and method of ash plume/cloud determination: 20190421/2120Z – Himawari-8(14) Remarks:(15) Contacts: Anton A. Nuzhdaev, IVS FEB RAS\nenvi@kscnet.ru \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.