http://www.youtube.com/watch?v=GT5TH7WU-JA
Over the past 12 hours, several "suspect" RADAR signatures have appeared over the Pacific Northwest.
Mount Saint Helens IS showing some signs.. all the volcanos in the Pacific Northwest are showing signs of rumbling.
Since SO many volcanos have erupted or showed signs of unrest, uptick in activity, it is worthy to note these harmonics and tremors at the actual volcano's themselves.
links below:
http://www.pnsn.org/WEBICORDER/BETTER/pnsn_staweb/index.html
http://www.pnsn.org/WEBICORDER/VOLC/welcome.html
http://www.isthisthingon.org/Yellowstone/daythumbs.php
http://aslwww.cr.usgs.gov/Seismic_Data/telemetry_data/map_sta_eq.shtml
http://www.volcano.si.edu/reports/usgs/