(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA) (2) Issued:20210224/0206Z (3) Volcano:Klyuchevskoy (CAVW #300260) (4) Current aviation colour code:ORANGE (5) Previous aviation colour code:yellow (6) Source:KVERT (7) Notice Number:2021-30 (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 flank eruption (lateral break) on the northwestern slope of Klyuchevskoy volcano continues to work. A bright incandescence over two craters of the flank eruption continues to observing on satellite and video images. The lava flows move from the craters. A mud flow along Krutenkaya River was noted on 23 February for about 7 km from 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 5-6 km (16,400-19,700 ft) a.s.l. from flank craters 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.