[VAGAbond]

A risk of telling everybody what I just discovered and you already knew, you can access American weather radar and see migrating birds. The small birds rise into the air late in the evening and can clearly be seen moving north during the night. The nearest radar is at Tacoma airport and its range reaches beyond Vancouver. Here is a site that explains how to do it:

http://www.audubon.org/news/how-use-radar-track-birds

[northvanrob]

This one of the best west coast bird migration radar called the
Northwest High Resolution reflectivity composite loop

http://tempest.aos.wisc.edu/radar/nw3compjs.html