(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA) (2) Issued:20210221/0033Z (3) Volcano:Klyuchevskoy (CAVW #300260) (4) Current aviation colour code:YELLOW (5) Previous aviation colour code:yellow (6) Source:KVERT (7) Notice Number:2021-28 (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:According to satellite data from the VolSatView Information System, a flank eruption (lateral break) began to form on the northwestern slope of Klyuchevskoy volcano at about 11:30 UTC on 20 February, 2021, and the eruption continues. A bright incandescence over the flank eruption began to observe from 15:23 UTC on 20 February at video-data by IVS FEB RAS. Probably a lava flow began to move from a lateral break. The flank eruption form on the altitude about 2.5-2.7 km a.s.l. near the Erman glacier. There is a real danger of mud flows for the Klyuchi Village. KVERT continues to monitor Klyuchevskoy volcano. \n\nA moderate gas-steam activity of the volcano continues. The danger of ash explosions up to 19,700-23,000 ft (6-7 km) a.s.l. remains. 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.