(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. The 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) Direction of drift of ash plume/cloud of the volcano: E / azimuth 87 deg Time 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 girina@kscnet.ru +74152202044 Duty 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. In 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.