NWS Mount Holly NJTO.W 0027August 20, 2026
Tornado Warning: Chester and Delaware County, PA
The National Weather Service office in Mount Holly issued a tornado warning for Chester and Delaware County in Pennsylvania, which was in force until 6:00 p.m. local time on August 20. It was the 27th tornado warning the NWS office in Mount Holly issued in 2026. Pennsylvania had 12 tornado warnings in August 2026, against 6 in an average August of 2008-2025 (Pennsylvania's tornado warnings by year).
ExpiredWarning
In force for 38 minutes; it has expired. The agency may have replaced it with a new notice.
The notice
- Issued by
- National Weather Service, Mount Holly NJ
- Area
- Chester and Delaware County
- State
- Pennsylvania
- Level
- Warning
- Issued
- 5:22 p.m. EDT, August 20, 2026
- Expires
- 6:00 p.m. EDT, August 20, 2026
- CAP severity, certainty, urgency
- Extreme, Observed, Immediate
- VTEC event
- KPHI TO.W 0027
- Official source
- National Weather Service: the notice at its source
Tornado Warnings in Pennsylvania since 2008Every warning type in Pennsylvania
Source: National Weather Service: the notice at its source. AreaZine rebuilds this page from the agency's record; the agency's page is the one to act on. A U.S. Government work, in the public domain.
The notice as issued
TORPHI The National Weather Service in Mount Holly NJ has issued a * Tornado Warning for... Central Chester County in southeastern Pennsylvania... Southwestern Delaware County in southeastern Pennsylvania... * Until 600 PM EDT. * At 522 PM EDT, severe thunderstorms capable of producing both tornadoes and extensive straight line wind damage were located along a line extending from Coatesville to 6 miles north of West Grove, moving east at 45 mph. HAZARD...Tornado. SOURCE...Radar indicated rotation. IMPACT...Flying debris will be dangerous to those caught without shelter. Mobile homes will be damaged or destroyed. Damage to roofs, windows, and vehicles will occur. Tree damage is likely. * Locations impacted include... West Chester, Chester, Coatesville, Westtown, Downingtown, Kennett Square, Parkesburg, Cheyney, Elam, Marshallton, Lima, Chelsea, Lionville-Marchwood, Gradyville, and Paoli.
What the agency told people to do
TAKE COVER NOW! Move to a basement or an interior room on the lowest floor of a sturdy building. Avoid windows. If you are outdoors, in a mobile home, or in a vehicle, move to the closest substantial shelter and protect yourself from flying debris. This line of thunderstorms is capable of producing tornadoes and widespread significant wind damage. Do not wait to see or hear the tornado. For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with these storms, and may lead to flash flooding. Do not drive your vehicle through flooded roadways.
Source: National Weather Service: the notice at its source. The text is the agency's, unedited. A U.S. Government work, in the public domain.