Thursday, September 03, 2009

Barn Swallow flock on Doppler radar

The green "burst" just above the word "Woodburn" on the map above was recorded this morning at about 6:25 a.m. The flock of Barn Swallows that is spending every night roosting in cornfields just to the west of the burst (across the Willamette River in Yamhill Co.) apparently begins every day by heading east, but at 7:30 p.m. they can be seen returning to the cornfield from every point of the compass. (Clicking on the image above will make it easier to see that the flock is airborne between Newberg and Woodburn at 6:25.)

This evening I tried again without much success to video the swallows that gather here before they head to South America for the winter. I estimate that there are several hundred thousand swallows here, but the video captures only a very small portion of the near edge of the huge flock.

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