Why ash from catastrophic 1980 Mount St. Helens eruption is swirling around the volcano
Some Pacific Northwesterners woke Tuesday to an unusual sight: A smoky haze shrouded Mount St. Helens, the large, active stratovolcano in Washington state that erupted catastrophically in 1980. But a new eruption was not to blame for the foggy scene this week, scientists said. Instead, ash from the blast that occurred 45 years ago had…