Photographs of a Funnel-Producing Indented Cloud-Base Swirl

Keith A. Brewster Program for Regional Observing and Forecasting Services, Boulder, CO 80303

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Abstract

An interesting swirl in the cloud base of a severe thunderstorm near Denver, Colorado, is documented with photographs and Doppler radar velocity measurements. The swirl, which produced two funnel clouds, may have been an eddy of a weak midlevel mesocyclone or a result of surface vorticity stretching by the storm's intense updraft.

Abstract

An interesting swirl in the cloud base of a severe thunderstorm near Denver, Colorado, is documented with photographs and Doppler radar velocity measurements. The swirl, which produced two funnel clouds, may have been an eddy of a weak midlevel mesocyclone or a result of surface vorticity stretching by the storm's intense updraft.

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