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Normalized rotation
Notes:
The pattern of increasing and deepening rotation prior to the first tornado touchdown can be seen on this loop of normalized rotation (blue indicating cyclonic rotation).
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Valid Fri 2139 UTC 23-Jul-2010
Valid Fri 2144 UTC 23-Jul-2010
Valid Fri 2148 UTC 23-Jul-2010
Valid Fri 2153 UTC 23-Jul-2010
Valid Fri 2157 UTC 23-Jul-2010
Slide 20