Mike Theiss of UltimateChase.com captures on video an intense and severe downburst / derecho from a collapsing supercell thunderstorm. Mike captures winds shred a gas station roof off as well as some powerflashes. This wind event went on to caused moderate damage in the Dallas / Fort Worth metroplex in Texas on June 1rst, 2004. Video Copyrighted Mike Theiss - UltimateChase.com