Overview
- The National Weather Service in State College issued consecutive Severe Thunderstorm Warnings on Thursday, Aug. 20, covering parts of Adams, York and Lancaster counties with alerts lasting into the late afternoon.
- Warnings cited radar‑indicated wind gusts up to 60 mph and small hail that can damage roofs, siding and trees and create hazardous driving conditions.
- Forecasters reported rotation within storms and warned tornadoes can develop rapidly even when not initially likely, so people in warned areas should take shelter immediately.
- The alerts named towns such as Lancaster, York, Red Lion, Mount Joy and Pennville and listed at‑risk stretches of Interstate 83 and the Pennsylvania Turnpike (mile markers 265–295), advising motorists to avoid flooded roadways.
- NWS said these short, fast storms are monitored in real time with radar and spotter reports and urged residents to stay inside sturdy structures and report severe weather to local law enforcement to aid verification.