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The supercell thunderstorm in this radar image does not show signs of a classic, tornado-producing supercell such as a hook echo or weak echo region.  Still, this image was taken as a tornado was on the ground, and illustrates that not all tornadic storms exhibit a classic signature.  Notice how the tornado is embedded in heavy rain which made it very difficult if not impossible to see.  This phenomenon is known as a rain-wrapped tornado.  Click the link under the radar image for a look at the storm's velocity pattern, which shows the tornadic circulation much more clearly.