First, it is incumbent on me to say that this Friday 8/2 is looking to be a very good day for migrant landbirds: front passing the day before, NNW winds overnight (currently forecast more north than west, less good but still good), kind of poor migrant weather recently. . . I'm predicting 1000+ warblers at the Higbee dike.
While we wait, look offshore. Hundreds of Black Terns in Cape May in late August/early September are certainly not unprecedented, but nor are these numbers annual. The BLTE show around the point has been wonderful, e.g. 96 in a single scan count this morning from Coral Avenue.