Jul 4, 2018
The Pittsburgh region continued to sit under an upper level ridge while tropical moisture lingered in the Northeast U.S. Sufficient instability allowed for a few strong storms to develop, causing tree damage. Localized flooding was the main concern due to a static atmosphere with light flow.
Source: NOAA National Weather Service Storm Events Database (event 772465). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Allegheny County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.