(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA) (2) Issued:20210404/0225Z (3) Volcano:Karymsky (CAVW #300130) (4) Current aviation colour code:ORANGE (5) Previous aviation colour code:green (6) Source:KVERT (7) Notice Number:2021-45 (8) Volcano Location:N 54 deg 2 min E 159 deg 26 min (9) Area:Kamchatka, Russia (10) Summit Elevation:1486 m (4874.08 ft)(11) Volcanic Activity Summary:According to Tokyo VAAC data, and satellite data by KVERT, probably explosions sent ash up to 8.5 km a.s.l. at 23:30 UTC on 03 April. Ash plume continues to drift to the north-east of the volcano. \n\nA moderate explosive-effusive eruption of the volcano continues. Ash explosions up to 8-9 km (23,000-29,500 ft) a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircraft. (12) Volcanic cloud height:8000-8500 m (26240-27880 ft) AMSL Time and method of ash plume/cloud height determination: 20210403/2330Z – Himawari-8(13) Other volcanic cloud information:Distance of ash plume/cloud of the volcano: 255 km (158 mi)\nDirection of drift of ash plume/cloud of the volcano: ENE / azimuth 72 deg \nTime and method of ash plume/cloud determination: 20210404/0102Z – JPSS-1 (14m15)\nStart time of explosion and how determined: 20210403/2330Z – Satellite data(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.