Well, the fate of this year's spring birding season is just about sealed. Tomorrow is the statewide World Series of Birding, and it's looking to be just as flat as the rest of this spring's migration has been. We needed several warm fronts with southerly, preferably southwesterly light overnight winds, and we didn't get them. One night of southerly winds, night of May 2, and it was followed by good numbers of arriving birds - but May 3 was rainy and very overcast, and the birds were not inclined to sing, and the lack of sun made most of them horribly backlit. You can actually see migration routes shifting inland. The Cornell Lab of Ornithology's new "migration dashboard" - https://birdcast.info/ - is somehow able to use radar to give good estimates of overhead migration at night, and I could see birds dividing around New Castle County in Delaware and heading inland following the spine of the eastern Appalachian ridge rather than the coast.
This has been the most recent of a number of consecutive years of poor spring migration in New Jersey, all due to rather relentless easterly and northeasterly winds, occasionally strong. There's fear the spring weather patterns are shifting for good.