Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 28000 ft (8500 m) altitude or flight level 280 . The full report is as follows: FVXX24 at 01:10 UTC, 21/09/19 from KNES VA ADVISORY DTG: 20190921/0108Z VAAC: WASHINGTON VOLCANO: POPOCATEPETL 341090 PSN: N1901 W09837 AREA: MEXICO SUMMIT ELEV: 17802 FT [5426…