Horseshoe Vortex on Supercell Inflow Band

We were admiring a fine-enough supercell in the western sky whenlo and behold!—I spied out of the left peripheral vision a sight not seen before.  Riding along the top of the westward-feeding low-level inflow band was a horseshoe vortex (far middle left), a slowly rotating cloud tube formed from shear-induced stretching of vortex lines.   Vorticity already is relatively maximized in these bands, but still, it was a rare treat to see it manifest this way.   More often, I have seen horseshoe vortices in blue skies within fields of cumulus, also on days with strong low-level shear.  One can see hundreds of supercells (as I have) and still witness something new almost every time, given enough observational attention.

3 S Duke OK (16 May 17) Looking WSW
34.6235, -99.5626

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