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Originally posted by jankopernik
BTW, if you overlaid the image you posted against the location of the NWS doppler sites you would see each puff ball centered over the radar site.
[edit on 29-9-2008 by jankopernik]
However, during the peaks of the bird migration seasons, in April and early September, extensive areas of the south-central U.S. may be covered by such echoes. Finally, aircraft often appear as "point targets" far from the radar, particularly in composite reflectivity images.