Weather radar picks up bird migration

TUCSON, Ariz. - With warmer weather upon us, many birds are heading north for the summer. This is a phenomenon often picked up on weather radars.

A batch of green blips seen on a Texas radar moving north towards Forth Worth, was in fact, just that. What may have looked like rain, wind, or something else, was a flock of birds. Although It takes a very large flock, usually thousands of birds, to register on the radar, this is something that has been happening for millions of years.

These non-weather blips are also known as ground clutter. Other ground clutter often seen on weather radars include bugs, aircraft, and dust.

Bird migration video courtesy National Weather Service.

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