(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
 (2) Issued:20160424/0351Z
 (3) Volcano:Klyuchevskoy (CAVW #300260)
 (4) Current Aviation Color Code:ORANGE
 (5) Previous Aviation Color Code:yellow
 (6) Source:KVERT
 (7) Notice Number:2016-48
 (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:Explosive volcanic eruption of Strombolian type continues. Satellite data by KVERT showed an intensive thermal anomaly over the volcano all week. Strong explosions sent ash up to 8-9 km a.s.l. near 13:40 UTC on 23 April, and ash cloud continues to drift to the south-west of the volcano. At 02:28 UTC on April 24, the leading edge of the ash cloud is an estimated 453 km south-west of the volcano.

Explosive eruption of the volcano continues. Ash explosions up to 19,700-26,240 ft (6-8 km) a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircraft.
(12) Volcanic cloud height:3280-6560 ft (1000-2000 m) AMSL Time and method of ash plume/cloud height determination: 20160424/0228Z – NOAA 19 (4m5)
(13) Other volcanic cloud information:Distance of ash plume/cloud of the volcano: 281 mi (453 km)
Direction of drift of ash plume/cloud of the volcano: WSW / azimuth 253 deg
Time and method of ash plume/cloud determination: 20160424/0228Z – NOAA 19 (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 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) FED 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 KVERT Volcanic Activity Notice, please use the following:
KVERT Volcanic Activity Notice, April 24, 2016. KVERT, Institute of Volcanology and Seismology FEB RAS. URL: http://kvert.febras.net/van/?n=2016-48.
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]

UNASSIGNED

There is insufficient information available to assess the current status of the volcano or volcanic activity.