For the last week there's been an increasing amount of rumblings and earthquakes coming from Mount St. Helens. Leading scientists to believe that the volcano was getting ready to erupt again for the first time since 1986.
Sure enough, St. Helens blew at roughly 2pm (cst) today, sending a column of white steam and ash about 16,000 feet in altitude. A rather anti-climatic result to a week's worth of buildup.
University of Washington seismologist Tony Qamar, "All this buildup was leading to that relatively small eruption."