FloodZoneMap.org

Flash Flood — Philadelphia, PA

Aug 4, 2020

Tropical Storm Isaias brought high winds, heavy rain, several tornadoes, and coastal flooding to the mid-Atlantic region, becoming the most impactful tropical cyclone to impact most of the region since Sandy in 2012. Flash flooding as a result of heavy rain caused two direct deaths from this event...one in Lehigh County and the other in Montgomery County.

Source: NOAA National Weather Service Storm Events Database (event 899981). Narrative written by NWS staff at the time of the event.

Flood Risk Context for Philadelphia, PA

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.

View Philadelphia County flood data →

More Flood Stories

Flash Flood1 death$4.2M damage

Philadelphia, PA · Sep 16, 1999

Hurricane Floyd battered Eastern Pennsylvania (especially Southeast sections around Philadelphia) on September 16th and brought with it torrential and in some places record breaking rains and damaging winds.

Read the full account →
Flash Flood1 death$2.0M damage

Philadelphia, PA · Sep 28, 2004

The remnants of Hurricane Jeanne interacting with two frontal boundaries in the region caused torrential downpours to occur during the late afternoon and evening of the 28th.

Read the full account →
Flash Flood1 death

Philadelphia, PA · Jul 28, 2013

A slow moving cold front coupled with a deep southerly flow of very moist air caused slow moving and in some instances back building thunderstorms to occur during the afternoon and evening of the 28th.

Read the full account →
Flash Flood1 death

Philadelphia, PA · May 30, 2016

Moisture from the remnants of tropical storm Bonnie moved northward into the region and interacted with a frontal boundary over the region. This resulted in several rounds of heavy rain on the night of the 29th and the early morning of the 30th.

Read the full account →