Minimal CAPE/Great Low-level Shear/Unfavorable Deep Layer Shear: Funnels on Bookend Vortex in northeast Colorado



Just east of Ovid, Colorado, and looking south, we could see the the southern member of a bookend vortex pair.


Northern most bookend.


Here was the northern member of the pair. Note the lowered base, and there were clear signs of cyclonic rotation.

Nice horizontal vortex roll got entrained into the uprdraft.



More horizontal vortex rolls...


Finally, a needle funnel begain to form.



Not a tornado. but pretty neat nevertheless.