Here are a few websites that record and count sightings of rare birds and migration events throughout New Jersey: 

NJBirds: Daily Rare Bird Sightings in New Jersey
https://lists.princeton.edu/cgi-bin/wa?A0=NJBIRDS


Voice of New Jersey Audubon: Weekly Bird Sightings in New Jersey
http://www.njaudubon.org/Tools.Net/Sightings/VoiceOf.aspx