(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
 (2) Issued:20190120/2243Z
 (3) Volcano:Bezymianny (CAVW #300250)
 (4) Current aviation colour code:RED
 (5) Previous aviation colour code:orange
 (6) Source:KVERT
 (7) Notice Number:2019-21
 (8) Volcano Location:N 55 deg 58 min E 160 deg 35 min
 (9) Area:Kamchatka, Russia
(10) Summit Elevation:9452.96 ft (2882 m)
(11) Volcanic Activity Summary:A strong explosive eruption of Bezymianny occurred at 16:10 UTC on 20 January: explosions sent ash up to 10 km a.s.l., and ash cloud began to drift to the north-west from the volcano. Activity of Bezymianny continues: a strong gas-steam plume with some amount of ash on the height about 3.5-4.5 km a.s.l. continues to drift to the north-west from the volcano; but an ash cloud from the strong explosions continues to drift on the height about 10-11 km a.s.l. on the distance about 600 km to the north-west from the volcano. Ongoing activity could affect international and low-flying aircrafts.

A moderate eruptive activity of the volcano continues. Ash explosions up to 32,800 ft (10 km) a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircrafts.
(12) Volcanic cloud height:11480-14760 ft (3500-4500 m) AMSL Time and method of ash plume/cloud height determination: 20190120/2230Z – Video data
(13) Other volcanic cloud information:Distance of ash plume/cloud of the volcano: 367 mi (590 km)
Direction of drift of ash plume/cloud of the volcano: WNW / azimuth 294 deg
Time and method of ash plume/cloud determination: 20190120/2129Z – NOAA 18 (4m5)
(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/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.

CITATION GUIDELINES

For formal scientific citation of this VONA/KVERT Information Release, please use the following:
VONA/KVERT Information Release, January 20, 2019. KVERT, Institute of Volcanology and Seismology FEB RAS. URL: http://www.kscnet.ru/ivs/kvert/van/?n=2019-21.
Aviation Colour Codes

GREEN

Volcano is in normal, non-eruptive state

   or, after a change from a higher level:

Volcanic activity considered to have ceased, and volcano reverted to its normal, non-eruptive state.

YELLOW

Volcano is experiencing signs of elevated unrest above known background levels.    

 or, after a change from higher level:

Volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.

ORANGE

Volcano is exhibiting heightened unrest with increased likelihood of eruption.

   or,

Volcanic eruption is underway with no or minor ash emission.
[specify ash-plume height if possible]

RED

Eruption is forecast to be imminent with significant emission of ash into the atmosphere likely.

  or,

Eruption is underway with significant emission of ash into the atmosphere.
[specify ash-plume height if possible]