Oct 28, 2021
Strong high pressure located in eastern Canada and slow moving low pressure approaching from the southeastern states resulted in a prolonged onshore flow along the Middle Atlantic coast. Moderate flooding occurred along the tidal Delaware River and its tributaries on the evening of October 28. There was moderate to major tidal flooding on the evening of October 29.
Source: NOAA National Weather Service Storm Events Database (event 986572). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Philadelphia County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.