(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA) (2) Issued:20231027/2118Z (3) Volcano:Klyuchevskoy (CAVW #300260) (4) Current aviation colour code:ORANGE (5) Previous aviation colour code:orange (6) Source:KVERT (7) Notice Number:2023-129 (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 summit explosive-effusive eruption of the volcano continues. Against the background of explosive activity of the Strombolian type (lava fountaining in the volcanic crater up to 500 m), the lava flows continue to effuse alternately along the Apakhonchichsky and Kozyrevsky chutes on the southern slopes of the volcano. Satellite data by KVERT showed an ash plume is extending for 65 km to the east-south-east of the volcano.\n\nThe summit explosive-effusive eruption of the volcano continues. Ash explosions up to 7-8 km (23,000-26,200 ft) a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircraft. (12) Volcanic cloud height:6000-6500 m (19680-21320 ft) AMSL Time and method of ash plume/cloud height determination: 20231027/2100Z – Video data(13) Other volcanic cloud information:Distance of ash plume/cloud of the volcano: 65 km (40 mi)\nDirection of drift of ash plume/cloud of the volcano: ESE / azimuth 116 deg \nTime and method of ash plume/cloud determination: 20231027/2050Z – Himawari-9 14m15(14) Remarks:(15) Contacts: Alexander G. Manevich, IVS FEB RAS\nmag@kscnet.ru +74152202115\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.