(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA) (2) Issued:20231103/0038Z (3) Volcano:Klyuchevskoy (CAVW #300260) (4) Current aviation colour code:ORANGE (5) Previous aviation colour code:orange (6) Source:KVERT (7) Notice Number:2023-148 (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 eruptive activity of Klyuchevskoy volcano decreased, but an ash plume continues to extend for 125 km to the east-northeast of the volcano.\n\nThe summit explosive-effusive eruption of the volcano continues. A danger of ash explosions up to 7-8 km (23,000-26,200 ft) a.s.l. remains. Ongoing activity could affect international and low-flying aircraft. (12) Volcanic cloud height:5000-5500 m (16400-18040 ft) AMSL Time and method of ash plume/cloud height determination: 20231102/2350Z – Himawari-9 14m15(13) Other volcanic cloud information:Distance of ash plume/cloud of the volcano: 125 km (78 mi)\nDirection of drift of ash plume/cloud of the volcano: ENE / azimuth 65 deg \nTime and method of ash plume/cloud determination: 20231102/2350Z – Himawari-9 14m15(14) Remarks:An edge of ash cloud of the paroxysmal phase of the Klyuchevskoy eruption extended more than 3000 km to the east-southeast of the volcano.(15) Contacts:Dr. Olga A. Girina, Head of KVERT, IVS FEB RAS\ngirina@kscnet.ru +74152202044\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.