Volcanic ash plume from Mount St. Helens triggers multiple SIGMETs
Written by AI from 2 reports listed below. Not checked by a person before publication. How we use AI
The Cascades Volcano Observatory issued a SIGMET on Thursday after satellite images and webcam footage showed an ash plume from Mount St. Helens rising to about 12,000 feet above sea level, and a separate SIGMET remained in effect later that evening.
An updated volcanic ash advisory was released at 5:48 pm local time, and the ash cloud was attributed to strong winds lifting old volcanic ash rather than new eruptive activity, while the volcano stayed at Aviation Color Code Green and Volcano Alert Level Normal.