Local brief
Ended: Flash Flood Warning for east-central Delaware County, PA — cancelled 4:31 a.m. EDT Monday
The National Weather Service cancelled the Flash Flood Warning for east-central Delaware County and southern Philadelphia at 4:31 a.m. EDT Monday, Oct. 12. Some streets and underpasses may still hold water; do not drive through it.
Ended: The National Weather Service in Mount Holly cancelled this Flash Flood Warning at 4:31 a.m. EDT Monday, Oct. 12 (1:31 a.m. PDT), ahead of its 5:45 a.m. end time. Water can stay on low roads and underpasses after the rain stops, so do not drive through it. Source: https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.62f3cb2f39c355c287749e8b3d78601630bbca45.001.1 (checked 1:50 a.m. PDT).
Essentials: Flash Flood Warning from the National Weather Service in Mount Holly, N.J., for east-central Delaware County (the same warning covers southern Philadelphia County). Issued 2:38 a.m. EDT Monday, Oct. 12. In effect until 5:45 a.m. EDT (2:45 a.m. PDT).
What is happening: At 2:38 a.m. EDT, Doppler radar showed thunderstorms with heavy rain over the area. Between 1 and 2 inches of rain have already fallen, and rain could come down at 1 to 2 inches an hour. NWS says flash flooding is happening now or will start shortly. Small creeks and streams, city streets, highways, underpasses and low spots can flood.
Where: Places NWS named include Philadelphia, South Philadelphia, Center City, Kensington, Roxborough, Morris Park, Philadelphia International Airport, Yeadon, Folcroft, Swarthmore, East Lansdowne and Darby Township. Highways in the warning: I-95 between mile markers 8 and 30, I-76 between mile markers 340 and 351, I-676 between mile markers 0 and 1, and I-476 between mile markers 6 and 7.
What to do: Turn around, don't drown. Never drive into a flooded underpass or street; six inches of moving water can knock you down and one to two feet can carry away a car. It is dark, so flooded roads are hard to see. If you are heading to the airport or out early, check your route first. If water rises near you, move to higher ground.
Get prepared: https://noticenearby.com/prepare
Stay informed: Check https://www.weather.gov/phi/ for updates from the National Weather Service, and follow Philadelphia's Office of Emergency Management (https://www.phila.gov/departments/oem/) and Delaware County Emergency Services. Turn on emergency alerts on your phone.
Sources: National Weather Service Mount Holly Flash Flood Warning via api.weather.gov (https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.7b0b2b6315a8266ecc27367c76315c311f721cc1.001.1), verified active 11:58 p.m. PDT Sunday, Oct. 11 (2:58 a.m. EDT Monday). Notice Nearby wrote this brief in its own words. More Delaware County notices: https://noticenearby.com/pa/delaware
Source: the public notice on this register NN-ENV-pa-delaware-flash-flood-warning-2026-10-1 · National Weather Service Mount Holly Flash Flood Warning.
This is a Notice Nearby local brief — an in-house explainer written from a government-posted notice on this register. It is not official minutes, not a newspaper story, and not Legal Publication.