Dual-Polarization Radar Data Guide

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WDTB Dual-Pol Primer FY104. Non-Meteorological Echo Dual-Pol Radar SignaturesIC4.3: Anomalous PropagationIntroduction:Objectives: To gain a basic understanding of dual-pol radar signatures of non-meteorological AP returns.Case Data: 11 February 2009 post-squall line in central Oklahoma. There is no WES data in your primer,but below is an excellent example of AP.Instructions: Note that absolutely no clutter filtering has been applied, so the sheer amount of AP isstaggering. WSR-88D data after the upgrade should filter AP as much as and likely more than before.Question 1: Below is an image of reflectivity after a strong squall line passes to the southeast ofKOUN. Use it as a reference as you examine the dual-pol products. What is characteristic of theAP echoes west, northwest, and north of the radar?Answer: Low to very high reflectivity values, at times exceeding 60 dBZ. Also very noisy.34
Question 2: Below is ZDR. What are the characteristics of ZDR in AP?Answer: ZDR appears to be less than 0, perhaps significantly so, but there are certainly pockets ofstrongly positive values mixed in there. This too is very noisy.35
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Dual-Polarization Radar Data Guide

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