Unusual activity has been spotted on the Brisbane weather radar. 7NEWS meteorologist Tony Auden explains. "While we're getting closer to storm season, not everything on the weather radar is rain. They can pick up insects, birds and even bats. This afternoon we are seeing some widespread echoes across the South East. It originated from a few blobs over the Darling Downs earlier in the afternoon. This isn't weather related; the most likely cause, as far as I'm aware, is chaff released from militar