The above is base-scan reflectivity from the NWS radar at LSX (St. Charles/St. Louis, Missouri) - time about 1800 UTC today (Wednesday, November 2nd). I have been noticing these strange, and persistent, clear air returns for a number of days, and asked about them in an e-mail. The LSX Webmaster replied:
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It is interference on our radar being caused by radio interference from 4G wireless internet towers that are popping up across the metro area. The Radar Operations Center in Norman Oklahoma is working on a filter that will dampen out these spikes. Hopefully they will be able to implement the filter later this year.
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This is an interesting problem, and one that will grow - unless the filter fix can be implemented fairly quickly.
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