variation of max plume height with time (MSH) TIME(LT) Max Plume Altitude (km)* 8:50 26.12 9:20 30.75 9:50 25.9 10:20 20.93 10:50 15.67 11:20 15.21 11:50 15.65 12:20 19.21 12:50 16.37 13:20 16.39 13:50 15.47 14:20 15.67 14:50 17.37 15:20 16.33 15:50 16.47 16:20 19.1 16:50 16.84 * Max Plume Altitude can be either the altitude of the Plinian or the altitude of the coignimbrite plume (from Holasek and Self 1995)