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VOLCANO OBSERVATORY NOTICE TO AVIATION (VONA) WMRA01 RUVX 310837 VONA DTG: 20260731/0837Z VOLCANO: SHEVELUCH 300270 PSN: N5638 E16119 AREA: RUSSIAN FEDERATION SOURCE ELEV: 2500M AMSL NOTICE NR: 2026/42 CURRENT COLOUR CODE: ORANGE PREVIOUS COLOUR CODE: RED SVO: KVERT ACT STS: ERUPTION ONGOING ONSET: NIL DUR: NIL VA CLD HGT: NO VA CLD PRODUCED HGT SOURCE: NO VA CLD PRODUCED MOV: NO VA CLD PRODUCED CTC: OLGA A. GIRINA, IVS FEB RAS, TEL: +79622825253, GIRINA@KSCNET.RU, KVERT.FEBRAS.NET RMK: NO NEW ASH EXPLOS HAVE BEEN OBS ON VOLCANO AT NOW, BUT VA CLD 390X60 KM IN SIZE IS OBS FROM 454 KM TO E OF VOLCANO (FROM ASH EXPLOS UP TO 10 KM ASL (START 0502 Z ON 31 JUL). NXT NOTICE: A NEW VONA WILL BE ISSUED IF COND CHANGE SIGNIFICANTLY OR IF THE COLOUR CODE CHANGES. |
CITATION GUIDELINES For formal scientific citation of this KVERT/VONA, please use the following: KVERT Volcano Observatory Notice for Aviation (VONA). July 31, 2026. KVERT, Institute of Volcanology and Seismology FEB RAS. URL: http://kvert.febras.net/van/?vn=125. |
| Aviation Colour Codes |
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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. |
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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] |
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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] |
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UNASSIGNED There is insufficient information available to assess the current status of the volcano or volcanic activity. |
