(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
 (2) Issued:20170328/0217Z
 (3) Volcano:Klyuchevskoy (CAVW #300260)
 (4) Current Aviation Color Code:YELLOW
 (5) Previous Aviation Color Code:green
 (6) Source:KVERT
 (7) Notice Number:2017-37
 (8) Volcano Location:N 56 deg 3 min E 160 deg 38 min
 (9) Area:Kamchatka, Russia
(10) Summit Elevation:15580 ft (4750 m)
(11) Volcanic Activity Summary:Gas-steam plume with some amount of ash extended 108 km to the east-north-east from the volcano.

The explosive eruption of the volcano continues. Ash explosions up to 19,700-26,200 ft (6-8 km) a.s.l. could occur at any time. Ongoing activity could affect low-flying aircraft.
(12) Volcanic cloud height:16400-19680 ft (5000-6000 m) AMSL Time and method of ash plume/cloud height determination: 20170327/2345Z – MODIS TERRA (31m32)
(13) Other volcanic cloud information:Distance of ash plume/cloud of the volcano: 67 mi (108 km)
Direction of drift of ash plume/cloud of the volcano: ENE / azimuth 71 deg
Time and method of ash plume/cloud determination: 20170327/2345Z – MODIS TERRA (31m32)
(14) Remarks:
(15) Contacts: Alexander G. Manevich, IVS FEB RAS
mag@kscnet.ru +74152202115

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.

CITATION GUIDELINES

For formal scientific citation of this VONA/KVERT Information Release, please use the following:
VONA/KVERT Information Release, March 28, 2017. KVERT, Institute of Volcanology and Seismology FEB RAS. URL: http://www.kscnet.ru/ivs/kvert/van/?n=2017-37.
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]