(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued:	20210822/2319Z
(3) Volcano:	Chirinkotan (CAVW #290260)
(4) Current aviation colour code:	ORANGE
(5) Previous aviation colour code:	orange
(6) Source:	KVERT
(7) Notice Number:	2021-99
(8) Volcano Location:	N 48 deg 58 min E 153 deg 28 min
(9) Area:	Northern Kuriles, Russia
(10) Summit Elevation:	724 m (2374.72 ft)
(11) Volcanic Activity Summary:	The moderate eruptive activity of the volcano continues. The explosive event of the volcano began at 22:35 UTC on 22 August. Ash cloud is drifting for 7 km to the southwest of the volcano. A moderate eruptive activity 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:	1500-2500 m (4920-8200 ft) AMSL Time and method of ash plume/cloud height determination: 20210822/2250Z – Himawari-8
(13) Other volcanic cloud information:	Distance of ash plume/cloud of the volcano: 8 km (5 mi) Direction of drift of ash plume/cloud of the volcano: WSW / azimuth 248 deg Time and method of ash plume/cloud determination: 20210822/2250Z – Himawari-8 Start time of explosion and how determined: 20210822/2235Z – Satellite data
(14) Remarks:
(15) Contacts:	Dr. Olga A. Girina, Head of KVERT, IVS FEB RAS girina@kscnet.ru +74152202044 Duty 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/. In 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.