(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA) (2) Issued:20200510/2232Z (3) Volcano:Klyuchevskoy (CAVW #300260) (4) Current aviation colour code:ORANGE (5) Previous aviation colour code:orange (6) Source:KVERT (7) Notice Number:2020-78 (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 moderate explosive-effusive eruption of the volcano continues. The Strombolian and sometimes Vulcanian types of volcanic activity is observing. The lava flow continues to move on the southeastern flank of the volcano (the Apakhonchich chute), phreatic bursts and collapse of loose slag material accompany this process. According to visual and satellite data, a gas-steam plume containing some amount of ash is extending about 50 km to the east of the volcano.\n\nA moderate explosive eruption of the volcano continues. Ash explosions up to 16,400-23,000 ft (5-7 km) a.s.l. could occur at any time. Ongoing activity could affect low-flying aircraft. (12) Volcanic cloud height:18040-19680 ft (5500-6000 m) AMSL Time and method of ash plume/cloud height determination: 20200510/2230Z – Visual data(13) Other volcanic cloud information:Distance of ash plume/cloud of the volcano: 31 mi (50 km)\nDirection of drift of ash plume/cloud of the volcano: E / azimuth 80 deg \nTime and method of ash plume/cloud determination: 20200510/2200Z – Himawari-8(14) Remarks:(15) Contacts: Alexander G. Manevich, IVS FEB RAS\nmag@kscnet.ru +74152202115\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.