(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA) (2) Issued:20231031/1857Z (3) Volcano:Klyuchevskoy (CAVW #300260) (4) Current aviation colour code:RED (5) Previous aviation colour code:red (6) Source:KVERT (7) Notice Number:2023-139 (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:Strong activity of the volcano continues. Satellite data showed the ash column rose up to 10 km a.s.l., and the ash plume is continuing extending for 1300 km to the south-southeast of the volcano.\n\nThe summit explosive-effusive eruption of the volcano continues. Ash explosions up to 12 km (39,400 ft) a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircraft. (12) Volcanic cloud height:9500-10000 m (31160-32800 ft) AMSL Time and method of ash plume/cloud height determination: 20231031/1820Z – Himawari-9 14m15(13) Other volcanic cloud information:Distance of ash plume/cloud of the volcano: 1300 km (808 mi)\nDirection of drift of ash plume/cloud of the volcano: ESE / azimuth 118 deg \nTime and method of ash plume/cloud determination: 20231031/1820Z – 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.