KVERT reported that at 0921 and 1155 on 22 April ash plumes from Klyuchevskoy rose to altitudes of 5-5.5 km (16,400-18,000 ft) a.s.l.
and drifted 130-140 km E, based on satellite and webcam data.
KVERT noted that the ash content in the plumes had significantly increased compared to emissions first observed on 9 April.
The Aviation Color Code was raised to Orange (the second highest level on a four-color scale).
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)