Colorado Landspout
A "landspout" is storm observer slang for a non-supercell tornado, most often seen in relatively dry enviromnents with weak wind shear and high-based thunderstorms. On this day, vertical shear favored supercells (and one did develop farther south); however, the process behind this tornado was not that of a mesocyclone. Such tornadoes typically take shape as a translucent dust column, like this, sometimes beneath funnel clouds, unlike this.
1 ESE Otis CO (4 Jun 4) looking SW.