Pennsylvania Extreme Tornado Warning | Effective 08/20/2026 14:34

Headline: 
Tornado Warning issued August 20 at 5:34PM EDT until August 20 at 6:00PM EDT by NWS Mount Holly NJ
Event: 
Tornado Warning
Urgency: 
Immediate
Effective: 
August 20, 2026 - 2:34pm
Expires: 
August 20, 2026 - 3:00pm
Description: 
At 534 PM EDT, a severe squall line capable of producing both tornadoes and extensive straight line wind damage was located along a line extending from near Glenmoore to near Marshallton, 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, Cheyney, Elam, Marshallton, Lima, Chelsea, Lionville-Marchwood, Gradyville, Paoli, Chester Springs, and Chester Township.
Instruction: 
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.
Area Description: 
Chester, PA; Delaware, PA
Forcast Office: 
NWS Mount Holly NJ
Sender: 
w-nws.webmaster@noaa.gov