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LEFT: Radar captures this snapshot of bird migration across the eastern and central United States on April 28, 2004, at 23:02 CDT. Precipitation appears over southern Texas and across parts of the West. Individual radars detect birds out to a certain range, shown as circular patterns of echoes. The overall pattern indicates that birds are migrating as a relatively continuous layer throughout the east-central United States.

RIGHT: NEXRAD (NEXt generation RADar) is also known as Weather Surveillance Radar, 1988 Doppler (WSR-88D). Pictured is the tower that houses the antennae inside the radome (white sphere).