(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued:	20231231/0020Z
(3) Volcano:	Klyuchevskoy (CAVW #300260)
(4) Current aviation colour code:	ORANGE
(5) Previous aviation colour code:	orange
(6) Source:	KVERT
(7) Notice Number:	2023-166
(8) Volcano Location:	N 56 deg 3 min E 160 deg 38 min
(9) Area:	Kamchatka, Russia
(10) Summit Elevation:	4750 m (15580 ft)
(11) Volcanic Activity Summary:	The eruptive activity of Klyuchevskoy volcano continues. Satellite and video data by KVERT showed an ash column rose up to 6-6.5 km a.s.l., and an ash plume is extending for 50 km to the north-west of the volcano. The activity of the volcano continues. A danger of ash rising up to 7 km (23,000 ft) a.s.l. remains. Ongoing activity could affect low-flying aircraft.
(12) Volcanic cloud height:	6000-6500 m (19680-21320 ft) AMSL Time and method of ash plume/cloud height determination: 20231231/0015Z – Video data
(13) Other volcanic cloud information:	Distance of ash plume/cloud of the volcano: 71 km (44 mi) Direction of drift of ash plume/cloud of the volcano: NW / azimuth 319 deg Time and method of ash plume/cloud determination: 20231230/2340Z – Himawari-9 14m15
(14) Remarks:
(15) Contacts:	Dmitry V. Melnikov, IVS FEB RAS dvm@kscnet.ru 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/. 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.