This aerial photo captures two aspects of a thunderstorm: a rain-free cloud base (left) and a curtain of rainfall (right). A rain-free base often indicates strong upward motions that can result in large hail and tornadoes.
Aerial view of cumulonimbus with rainshaft (DI00136), Photo by Lester Zinser
Lester Zinser
University Corporation for Atmospheric Research (UCAR)
image
Clouds
NCAR/UCAR Image and Multimedia Gallery
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DI00136
http://n2t.net/ark:/85065/d7639mpv
