A Supercell Thunderstorm Cloud Over Montana . ... Such colossal storm systems center on mesocyclones -- rotating updrafts that can span several kilometers and deliver torrential rain and high winds including tornadoes . Jagged sculptured clouds adorn the supercell's edge , while wind swept dust and rain dominate the center. ... The above supercell cloud was photographed in July west of Glasgow , Montana , USA, caused minor damage, and lasted several hours before moving on. ...