(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA) (2) Issued:20231031/2314Z (3) Volcano:Klyuchevskoy (CAVW #300260) (4) Current aviation colour code:RED (5) Previous aviation colour code:red (6) Source:KVERT (7) Notice Number:2023-142 (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:Activity of the volcano significantly increased. Satellite data showed the ash column rose up to 14 km a.s.l., and the ash plume is continuing extending for 1500 km to the south-southeast of the volcano.\n\nThe summit explosive-effusive eruption of the volcano continues. Ash explosions up to 15 km (49,200 ft) a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircraft. (12) Volcanic cloud height:13000-14000 m (42640-45920 ft) AMSL Time and method of ash plume/cloud height determination: 20231031/2310Z – Video data(13) Other volcanic cloud information:Distance of ash plume/cloud of the volcano: 1500 km (932 mi)\nDirection of drift of ash plume/cloud of the volcano: ESE / azimuth 112 deg \nTime and method of ash plume/cloud determination: 20231031/2240Z – 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.