Katla (Southern Iceland): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) London warned about a volcanic ash plume that rose up to estimated 20000 ft (6100 m) altitude or flight level 200 . The full report is as follows: ERUPTION TO 15KM OBS VA DTG:15/1500Z to 20000 ft (6100 m) Klyuchevskoy (Kamchatka): Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: VA…