Prior to 1980, Mount St Helens was a nearly perfect cone. On May 18, of that year, the north
face of the mountain collapsed releasing the largest debris avalanche in recorded history.

 Between 1980 and 1986, activity continued at Mount St. Helens, with a new lava dome forming
in the crater. This new partially snow covered dome can be seen below in the center of the frame.

The day was very hazy due, in part, to wild fires in Washington state.

 
 
 

There is still very little growth in the blast zone (the area covered
by the flow of superheated gas, rock and mud).