0.5 Deg. Base Reflectivity

535 PM

0.5 Deg. Base Reflectivity 22:36Z

Notice the Hook structure on the Base Reflectivity image above. There was also a tight reflectivity gradient. The Hook structure as well as a bonafide Operator Defined Mesocyclone prompted the Tornado Warning for Northern Des Moines County, IA.

0.5 Deg. Storm Relative Velocity

5:35 PM

0.5 Deg. Storm Relative Velocity 22:36Z

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