Gallery of Outflow
Back in our NSSL field project days in 1989, Rich Thompson coined the term "Scud Cigar," a.k.a. Scud Stogie, for these kinds of elongated, often rather smooth and cigar-like, low-level cloud masses. [It seemed as if outflow was all we saw storms produce that year, so we got good at watching it and nicknaming its effects.] A specialized but common variety of fractocumulus, stogies form in an area of cold outflow -- usually on the back side of an outflow-dominant multicell, supercell or squall line.
29 SSW Ft. Sumner NM (5 Jun 3) looking NNW