Tropical Storm Fay (link1, link2) passed through Philadelphia on July 10, 2020. This storm dumped 2 – 4 inches of rain on the Philadelphia area from about 8:00 AM to 4:00 PM on Friday, July 10th.
This plot shows NOAA’s Advanced Hydrologic Prediction Centers (AHPC) precipitation map for Philadelphia as of 8:AM on July 11, 2020.
The map shows the historic Wingohocking Creek Watershed which covers a major portion of NW Philadelphia. You can see that the Wingohocking Watershed received anywhere from 2.5 to 4 inches of rain over this storm.
This storm caused significant flooding at Belfield and Church. A local resident captured the video of the flooded intersection and posted it on Facebook at this link.