These metallic-laced (aerosol) clouds were formed with the help of Doppler stations in close proximity to Calgary, AB. What is interesting is that the radar images on and near the date of May 10th are not available to public, for all areas in Canada. Has this data been intentionally removed and censored to the public? Please see the video below, regarding these strange cloud formations on May 10, 2013:
Our Skywatchers are wondering if this was a test phase for the roll clouds that were geoengineered on June 18th, prior to the Alberta flooding. However, this is pure speculation.