(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA) (2) Issued:20190421/2359Z (3) Volcano:Klyuchevskoy (CAVW #300260) (4) Current aviation colour code:ORANGE (5) Previous aviation colour code:yellow (6) Source:KVERT (7) Notice Number:2019-83 (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:Activity of the volcano increased. Gas-steam plumes containing some amount of ash drifting to the different directions from the volcano began to observing from 08 April, 2019. Today an amount of ash in the gas-steam plume significantly increased. Ash plume continues to drift to the east 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:18040 ft (5500 m) AMSL Time and method of ash plume/cloud height determination: 20190421/2355Z – Video data(13) Other volcanic cloud information:Distance of ash plume/cloud of the volcano: 81 mi (130 km)\nDirection of drift of ash plume/cloud of the volcano: E / azimuth 87 deg \nTime and method of ash plume/cloud determination: 20190421/2340Z – Himawari-8(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.