(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued:	20170723/2216Z
(3) Volcano:	Sheveluch (CAVW #300270)
(4) Current Aviation Color Code:	ORANGE
(5) Previous Aviation Color Code:	red
(6) Source:	KVERT
(7) Notice Number:	2017-169
(8) Volcano Location:	N 56 deg 38 min E 161 deg 18 min
(9) Area:	Kamchatka, Russia
(10) Summit Elevation:	10768.24 ft (3283 m), the dome elevation ~8200 ft (2500 m)
(11) Volcanic Activity Summary:	Strong gas-steam activity of the volcano possibly with small amount of ash continues, but ash explosions are not noting. Large explosive event occurred at 1740 UTC on 23 July, 2017. Explosions sent ash up to 11.5-12 km a.s.l., strong pyroclastic flows were observed. Ash cloud continues to drift to the north-east from the volcano, its front is lacated for about 602 km from the volcano. Explosive-extrusive eruption of the volcano continues. Ash explosions up to 32,800-49,200 ft (10-15 km) a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircraft.
(12) Volcanic cloud height:	11480-13120 ft (3500-4000 m) AMSL Time and method of ash plume/cloud height determination: 20170723/2200Z – Video data
(13) Other volcanic cloud information:	Distance of ash plume/cloud of the volcano: 374 mi (602 km) Direction of drift of ash plume/cloud of the volcano: E / azimuth 82 deg Time and method of ash plume/cloud determination: 20170723/2130Z – Himawari-8 Duration of explosion: ~ 420 minutes
(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 Aviation Color Code is changes. VONAs are posted at http://www.kscnet.ru/ivs/kvert/index_eng.php. 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.