As thunderstorms are impacting us here in Chautauqua County on the edge of a strong cold front birds are in flight on the cooperative northerly flow in its wake. The roughly circular areas of green are all avian targets being picked up by radar stations behind it. They appear centered only because the EM pulse rises as it moves away in all directions from the radar and most birds are flying a few to several thousand feet up. The hole in the middle is the cone of silence as the pulse does not go straight up and is sent out at a low altitude. In reality birds are flying everywhere in those regions in these conducive conditions. Enjoy a superb morning of migrants wherever you see those donuts.
