I believe the best indicator of new birds landing in NYC is the radar 
activities above the city in the early morning hours, before sunrise. Radar 
activities in the evening hours, before midnight, indicate birds leaving the 
city.
There are activities this early morning which suggest new birds in the city.
Check the time between 1 and 4 am on this page:

https://www.pauljhurtado.com/US_Composite_Radar/2019-5-7/


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NYSbirds-L List Info:
http://www.NortheastBirding.com/NYSbirdsWELCOME.htm
http://www.NortheastBirding.com/NYSbirdsRULES.htm
http://www.NortheastBirding.com/NYSbirdsSubscribeConfigurationLeave.htm

ARCHIVES:
1) http://www.mail-archive.com/nysbirds-l@cornell.edu/maillist.html
2) http://www.surfbirds.com/birdingmail/Group/NYSBirds-L
3) http://birding.aba.org/maillist/NY01

Please submit your observations to eBird:
http://ebird.org/content/ebird/

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