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There are a lot of interesting anomalies that you may see on displays that show NEXRAD (or any kind of) weather radar data. Some are caused by software, some are caused by the radar misinterpreting what it sees. None are worth some of the conspiracy theories that non-scientists have come up with. Last month, blog reader Mike asked what is responsible for the radar "bloom" (or "radar blobs") that occurs nationwide, but especially in the Southeast U.S. in Spring and Fall. What he is referring to is the gradual growth of non-precipitation objects on radar after sunset (and the data fades after sunrise). During the night, this causes a large blob around each radar site. I have uploaded some examples from that night.