1. The wind forecast (NW at sunset, N during the night, NE by morning… see the circular wind plot graph)
2. Tomorrow is the day after the passage of a cold front (CF+1 on the graph)
3. Most birds are recorded within the first hour-and-a-half after sunrise (see bar graph)

[Show as slideshow]

Figures from Wiedner, D., P. Kerlinger, D. Sibley, P. Holt, J. Hough, and R. Crossley. 1992. Visible morning flight of neotropical landbird migrants at Cape May, New Jersey. The Auk 109:500-510.