Look at the Radar!

. . . and when you're done, go outside to look at the cloudless sky. Those radar marks are birds, 9:01 p.m. EDT on the image below. Listen, too, though they're high by now, maybe out of earshot. Blue means headed towards the Dover, DE radar station from the southwest, red means headed away, towards the northeast. This image from National Center for Atmospheric Research. Of course we know birds fly north in the spring - but many are doing it tonight, right now - hope for tomorrow. [Thanks to Tony Leukering for prodding us to have a look.]