Radar-derived estimates show a large swath over 7" of rain across the densely populated corridor from E PA to just west of NYC so far.

Waiting on rain gauge data to confirm, but estimates are as high as 12 INCHES -- 1 FOOT OF RAIN -- in parts of NJ.

This is historic flooding... pic.twitter.com/ocjQqHZpj4

— Tomer Burg (@burgwx) September 2, 2021