Shiveluch (Kamchatka): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Tokyo warned about a volcanic ash plume that rose up to estimated 22000 ft (6700 m) altitude or flight level 220 and is moving at 40 kts in NW direction. The full report is as follows: POSS VA CONTINUOUSLY OBS IN SATELLITE IMAGERY. to 22000 ft (6700 m) …6 Apr: Explosive activity continues. Volcanic Ash…