(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA) (2) Issued:20210726/0243Z (3) Volcano:Sheveluch (CAVW #300270) (4) Current aviation colour code:ORANGE (5) Previous aviation colour code:orange (6) Source:KVERT (7) Notice Number:2021-75 (8) Volcano Location:N 56 deg 38 min E 161 deg 18 min (9) Area:Kamchatka, Russia (10) Summit Elevation:3283 m (10768.24 ft), the dome elevation ~2500 m (8200 ft)(11) Volcanic Activity Summary:Activity of the volcano has increased from 19:20 UTC on 25 July, 2021. According to video data, strong gas-steam emission containing some amount of ash continues at the volcano. The collapses of the lava dome blocks, and small explosions are observing. The Dolphin lava block is probably being actively destroyed. Satellite data showed a gas-steam plume containing some amount of ash is extending to the east from the volcano.\n\nThe extrusive eruption of the volcano continues. Ash explosions up to 10-15 km (32,800-49,200 ft) a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircraft. (12) Volcanic cloud height:3500 m (11480 ft) AMSL Time and method of ash plume/cloud height determination: 20210726/0155Z – Video data(13) Other volcanic cloud information:Distance of ash plume/cloud of the volcano: 42 km (26 mi)\nDirection of drift of ash plume/cloud of the volcano: E / azimuth 90 deg \nTime and method of ash plume/cloud determination: 20210726/0130Z – Himawari-8(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.