(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA) (2) Issued:20231115/0115Z (3) Volcano:Klyuchevskoy (CAVW #300260) (4) Current aviation colour code:GREEN (5) Previous aviation colour code:yellow (6) Source:KVERT (7) Notice Number:2023-159 (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 explosive-effusive eruption of the Klyuchevskoy volcano, which lasted from 22 June to 05 November, has ended, only fumarole activity of the summit crater is observed. Satellite data by KVERT showed a thermal anomaly over the volcano associated with the cooling of lava flows. The value of temperature difference between the thermal anomaly and the background decreased from 115 degrees Celcius on 01 November to 27 degrees Celcius on 14 November. KVERT continues to monitor Klyuchevskoy volcano.\n\nA gas-steam activity of the volcano continues. Ongoing activity could affect low-flying aircraft. (12) Volcanic cloud height:NO ASH CLOUD PRODUSED(13) Other volcanic cloud information:NO ASH CLOUD PRODUSED(14) Remarks:(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.