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NEXRAD Explained : Bird Migration or Precipitation?

Monday, November 08, 2010 @ 6:01 PM

The Wisconsin Society for Ornithology explains the effect of nocturnal bird migration on RADAR stations, especially during the fall months.  The "doughnut effect" becomes visible approximately 30-minutes after sunset and disappears in the morning hours as the birds begin to land.  It is distinguishable from precipitation by its soft edges on visible RADAR, where visible precipitation reflects a more distinct edge.

» Read the full article about NEXRAD and Bird Migration!