Most tornadic supercells have a counter clockwise circulation, or cyclonic circulation in the northern hemisphere. The cell I am showing you has NOT had a tornado reported with it much less a tornado warning but has shown an anti-cyclonic or clockwise circulation for sometime. This storm is what we cause a left mover. Many times the left moving part of a splitting supercell weakens and dies out. However, in some cases the left moving cell can become very strong. In the image above you can see the air moving towards and away from the GSP radar site shows a clockwise circulation. We had a similar situation last year in Arkansas were a left moving super cell produced an EF2 tornado. The image below shows what appears to a backwards hook echo.
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