This Day In History - Mount St. Helens

From historychannel.com

MOUNT ST. HELENS ERUPTS:
May 18, 1980

At 8:32 a.m. PDT, Mount St. Helens, a volcanic peak in southwestern Washington,
suffers a massive eruption, killing 57 people and devastating some 210 square
miles of wilderness.

If you care to keep tabs on the latest activity, go see the St. Helen's web cam here, or seismic activity here.