(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA) (2) Issued:20231230/2354Z (3) Volcano:Klyuchevskoy (CAVW #300260) (4) Current aviation colour code:ORANGE (5) Previous aviation colour code:green (6) Source:KVERT (7) Notice Number:2023-165 (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:Strombolian-type of explosive eruption of the Klyuchevskoy volcano is observing from December 27, 2023. The bright thermal anomaly over the volcano is noting at satellite images. Satellite and video data by KVERT showed an ash column rose up to 5-5.5 km a.s.l., and an ash plume is extending for 50 km to the north-west of the volcano. KVERT continues to monitor Klyuchevskoy volcano.\n\nThe 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:5000-5500 m (16400-18040 ft) AMSL Time and method of ash plume/cloud height determination: 20231230/2350Z – Video data(13) Other volcanic cloud information:Distance of ash plume/cloud of the volcano: 50 km (31 mi)\nDirection of drift of ash plume/cloud of the volcano: NW / azimuth 318 deg \nTime and method of ash plume/cloud determination: 20231230/2310Z – Himawari-9 14m15(14) Remarks:(15) Contacts: Dmitry V. Melnikov, IVS FEB RAS\ndvm@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/.\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.