Rain Shaft
has a fuzzy, bulbous appearance

Photograph by: Doswell

Developing rain shafts often have a fuzzy, bulbous appearance as they descend. If a source of dry air is present and the air into which the rain is falling is sufficiently warm, then strong, and possibly damaging microbursts are possible.

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Credits and Acknowledgments for WW2010.
Department of Atmospheric Sciences (DAS) at
the University of Illinois at Urbana-Champaign.