(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA) (2) Issued:20230904/0754Z (3) Volcano:Klyuchevskoy (CAVW #300260) (4) Current aviation colour code:YELLOW (5) Previous aviation colour code:orange (6) Source:KVERT (7) Notice Number:2023-94 (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:Video and satellite data by KVERT shows a strong wind lifts ash from the easthern slopes of Klyuchevskoy volcano, and a plume of resuspended ash is extending about 170 km to the east of the volcano.\n\nThe summit explosive eruption of the volcano continues. Ash explosions up to 6 km (19,700 ft) a.s.l. could occur at any time. Ongoing activity could affect low-flying aircraft. (12) Volcanic cloud height:3000-3500 m (9840-11480 ft) AMSL Time and method of ash plume/cloud height determination: 20230904/0740Z – Video data(13) Other volcanic cloud information:Distance of ash plume/cloud of the volcano: 170 km (106 mi)\nDirection of drift of ash plume/cloud of the volcano: E / azimuth 83 deg \nTime and method of ash plume/cloud determination: 20230904/0720Z – 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.