Monday, May 09, 2005

ENV: Migration by Radar

This morning, after passage of two stormlines yesterday, i was particularly interested in whether birds would follow the passage of the storm. They did.

The graphic above is sloppy but shows characteristic donut-shaped radar signals of migrating birds. I pieced together the radar signatures from five stations (Del Rio, Brownsville, Corpus Christi, San Antonio, and Houston-Galveston), and then spent some time in Photoshop trying to enhance the images in a way that would make them useful. The kind of image i wanted wasn't possible without spending a great deal more time on it (which i don't have), so this will have to do. And i added some goofy patterned rings to point out the "donuts" and that didn't work like i wanted, so . . .

Especially cool, i thought, was the Houston graphic which showed the tail end of the storm and birds rising not long after passage, but none in front of the storm.

And check out the sheer volume of birds over the Brownsville station.

Here's a webpage from Clemson University with some graphic explanation.


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