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4:10PM - Base Reflectivity

Same Time - (SRMV) Velocity Map

Obviously, there is more "stuff" detected on the right (SRMV) than the base reflectivity, The reason is Base Reflectivity is in Precip mode and omits Echoes greater than 5 DbZ. whereas SRMV depicts all echoes, regardless of DbZ that have a nominal speed to be registered.

So, echoes that exist on the right panel that are not in areas on the left panel could be deemed as smaller than 5 DbZ. Below is a mask of all the echoes from both panels, Gray areas are a mask of the reflectivity where light blue areas are from the Velocity panel.

Overlaid, they depict all echoes, regardless of DbZ bounds.