Southeastern Lehigh County was included in a severe thunderstorm warning until 6:15 p.m. Friday, the National Weather Service said.
In addition, all of Bucks, Lehigh, Monroe and Northampton counties in Pennsylvania and Warren and Hunterdon counties in New Jersey were under a severe thunderstorm watch until 10 p.m.
"A few storms that develop late this afternoon and this evening may become strong to severe with the greatest risk occurring between 5 and 9 p.m.," the watch read. "Locally damaging winds will be the primary threat from these storms.
"Pockets of heavy rainfall could lead to localized flooding, primary in poor drainage areas, late tonight."
The worst-hit areas could see wind gusts of 60 mph, the weather service said; the thunderstorm warning said to expect damage to trees and power lines.
"Some rotation has been indicated by radar inside this storm," the warning read. "While not likely, a tornado is possible."
Kurt Bresswein may be reached at kbresswein@lehighvalleylive.com. Follow him on Twitter @KurtBresswein. Find lehighvalleylive.com on Facebook.