Severe thunderstorms swept through South-Central Pennsylvania on April 15, 2025, prompting multiple warnings from the National Weather Service (NWS). These storms brought damaging winds, hail, and the potential for significant property damage across several counties.
Initially, a severe thunderstorm warning was issued for Franklin and Adams Counties, effective until 4 PM. The NWS reported that the storm was moving across key areas, including Arendtsville, Quincy, and Chambersburg, with wind gusts reaching up to 60 mph and nickel-sized hail expected. Residents were advised to prepare for possible damage to roofs, siding, and trees as the storm progressed.
As the day unfolded, the NWS updated its warnings, indicating that the storm system was moving eastward. By 4:38 PM, a new severe thunderstorm warning was issued for Berks, Bucks, Lehigh, and Northampton counties, valid until 4:45 PM. The weather service reported an outflow boundary capable of producing damaging winds, located along a line from Frenchtown to Richboro, moving east at 55 mph. "Damage to roofs, siding, trees, and power lines is possible," the NWS warned.
Locations impacted by this warning included Fricks, Emmaus, and Doylestown, with several major highways affected, including the Pennsylvania Turnpike and Interstate 76. The weather service emphasized the need for caution during these storms, reminding residents that severe thunderstorms may contain little or no lightning, urging them not to wait until thunder is heard before seeking shelter.
By 5:04 PM, another severe thunderstorm was detected over Hummelstown, moving east at 45 mph, affecting Lancaster and Lebanon counties. This storm, too, was characterized by 60 mph wind gusts and penny-sized hail, prompting further warnings. The NWS forecasted possible damage to structures and trees in areas such as Harrisburg International Airport and Cornwall.
As the storms continued to move through the region, the NWS reported that storm warnings for York and Adams counties would expire by late afternoon. A special weather statement was also set to conclude at 4:30 PM. Earlier, reports indicated half-inch hail and wind gusts of 55 mph in the Hanover and York areas, with significant hail observed in northern Adams County.
In light of these weather conditions, experts provided safety tips for residents. The NWS recommends that individuals stay indoors during severe weather, away from windows, and ideally in a basement or interior room. Those caught outside should seek shelter immediately, as sheds and tents offer little protection against severe storms. Additionally, the NWS advised motorists to avoid parking under trees that could fall during high winds.
Lightning is another significant concern during thunderstorms. Each year, approximately 25 million lightning strikes occur in the United States, with about 20 fatalities reported annually. To stay safe, the NWS urges individuals to monitor the sky for threatening signs and listen for thunder. Once indoors, it is crucial to avoid using corded phones and electrical appliances.
For those without access to indoor shelter during a storm, the NWS advises avoiding open fields and tall trees, as these locations are at greater risk for lightning strikes. If camping, individuals should seek low-lying areas, as tents do not provide adequate protection against lightning.
As the storms moved out of the area, the NWS confirmed that the warnings for Adams County would expire, signifying a return to calmer weather. However, they cautioned that additional storms could still develop in the region, keeping residents alert and prepared.
The severe weather highlights the importance of being informed and prepared during thunderstorms. By following safety guidelines and staying updated with NWS alerts, residents can significantly reduce the risks associated with these powerful storms.
